{ This file is part of the Free Pascal run time library. Copyright (c) 1999-2000 by Michael Van Canneyt, member of the Free Pascal development team DB header file with interface section. See the file COPYING.FPC, included in this distribution, for details about the copyright. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. **********************************************************************} unit db; {$mode objfpc} {$h+} interface uses Classes,Sysutils,Variants,FmtBCD,MaskUtils; const dsMaxBufferCount = MAXINT div 8; dsMaxStringSize = 8192; // Used in AsBoolean for string fields to determine // whether it's true or false. YesNoChars : Array[Boolean] of char = ('N', 'Y'); SQLDelimiterCharacters = [';',',',' ','(',')',#13,#10,#9]; type {LargeInt} LargeInt = Int64; PLargeInt= ^LargeInt; { Auxiliary type } TStringFieldBuffer = Array[0..dsMaxStringSize] of Char; { Misc Dataset types } TDataSetState = (dsInactive, dsBrowse, dsEdit, dsInsert, dsSetKey, dsCalcFields, dsFilter, dsNewValue, dsOldValue, dsCurValue, dsBlockRead, dsInternalCalc, dsOpening); TDataEvent = (deFieldChange, deRecordChange, deDataSetChange, deDataSetScroll, deLayoutChange, deUpdateRecord, deUpdateState, deCheckBrowseMode, dePropertyChange, deFieldListChange, deFocusControl, deParentScroll,deConnectChange,deReconcileError,deDisabledStateChange); TUpdateStatus = (usUnmodified, usModified, usInserted, usDeleted); TUpdateStatusSet = SET OF TUpdateStatus; TUpdateMode = (upWhereAll, upWhereChanged, upWhereKeyOnly); TResolverResponse = (rrSkip, rrAbort, rrMerge, rrApply, rrIgnore); TProviderFlag = (pfInUpdate, pfInWhere, pfInKey, pfHidden); TProviderFlags = set of TProviderFlag; { Forward declarations } TFieldDef = class; TFieldDefs = class; TField = class; TFields = Class; TDataSet = class; TDataBase = Class; TDataSource = Class; TDataLink = Class; TDBTransaction = Class; { Exception classes } EDatabaseError = class(Exception); EUpdateError = class(EDatabaseError) private FContext : String; FErrorCode : integer; FOriginalException : Exception; FPreviousError : Integer; public constructor Create(NativeError, Context : String; ErrCode, PrevError : integer; E: Exception); Destructor Destroy; override; property Context : String read FContext; property ErrorCode : integer read FErrorcode; property OriginalException : Exception read FOriginalException; property PreviousError : Integer read FPreviousError; end; { TFieldDef } TFieldClass = class of TField; { TFieldType = (ftUnknown, ftString, ftSmallint, ftInteger, ftWord, ftBoolean, ftFloat, ftDate, ftTime, ftDateTime, ftBytes, ftVarBytes, ftAutoInc, ftBlob, ftMemo, ftGraphic, ftFmtMemo, ftParadoxOle, ftDBaseOle, ftTypedBinary, ftCursor); } TFieldType = (ftUnknown, ftString, ftSmallint, ftInteger, ftWord, ftBoolean, ftFloat, ftCurrency, ftBCD, ftDate, ftTime, ftDateTime, ftBytes, ftVarBytes, ftAutoInc, ftBlob, ftMemo, ftGraphic, ftFmtMemo, ftParadoxOle, ftDBaseOle, ftTypedBinary, ftCursor, ftFixedChar, ftWideString, ftLargeint, ftADT, ftArray, ftReference, ftDataSet, ftOraBlob, ftOraClob, ftVariant, ftInterface, ftIDispatch, ftGuid, ftTimeStamp, ftFMTBcd, ftFixedWideChar, ftWideMemo); { Part of DBCommon, but temporary defined here (bug 8206) } TFieldMap = array[TFieldType] of Byte; { TDateTimeRec } TDateTimeAlias = type TDateTime; PDateTimeRec = ^TdateTimeRec; TDateTimeRec = record case TFieldType of ftDate: (Date: Longint); ftTime: (Time: Longint); ftDateTime: (DateTime: TDateTimeAlias); end; TFieldAttribute = (faHiddenCol, faReadonly, faRequired, faLink, faUnNamed, faFixed); TFieldAttributes = set of TFieldAttribute; { TNamedItem } TNamedItem = class(TCollectionItem) private FName: string; protected function GetDisplayName: string; override; procedure SetDisplayName(const AValue: string); override; Public property DisplayName : string read GetDisplayName write SetDisplayName; published property Name : string read FName write SetDisplayName; end; { TDefCollection } TDefCollection = class(TOwnedCollection) private FDataset: TDataset; FUpdated: boolean; protected procedure SetItemName(AItem: TCollectionItem); override; public constructor create(ADataset: TDataset; AOwner: TPersistent; AClass: TCollectionItemClass); function Find(const AName: string): TNamedItem; procedure GetItemNames(List: TStrings); function IndexOf(const AName: string): Longint; property Dataset: TDataset read FDataset; property Updated: boolean read FUpdated write FUpdated; end; { TFieldDef } TFieldDef = class(TNamedItem) Private FDataType : TFieldType; FFieldNo : Longint; FInternalCalcField : Boolean; FPrecision : Longint; FRequired : Boolean; FSize : Integer; FAttributes : TFieldAttributes; Function GetFieldClass : TFieldClass; procedure SetAttributes(AValue: TFieldAttributes); procedure SetDataType(AValue: TFieldType); procedure SetPrecision(const AValue: Longint); procedure SetSize(const AValue: Integer); procedure SetRequired(const AValue: Boolean); public constructor create(ACollection : TCollection); override; constructor Create(AOwner: TFieldDefs; const AName: string; ADataType: TFieldType; ASize: Integer; ARequired: Boolean; AFieldNo: Longint); overload; destructor Destroy; override; procedure Assign(APersistent: TPersistent); override; function CreateField(AOwner: TComponent): TField; property FieldClass: TFieldClass read GetFieldClass; property FieldNo: Longint read FFieldNo; property InternalCalcField: Boolean read FInternalCalcField write FInternalCalcField; property Required: Boolean read FRequired write SetRequired; Published property Attributes: TFieldAttributes read FAttributes write SetAttributes default []; property DataType: TFieldType read FDataType write SetDataType; property Precision: Longint read FPrecision write SetPrecision; property Size: Integer read FSize write SetSize; end; { TFieldDefs } TFieldDefs = class(TDefCollection) private FHiddenFields : Boolean; function GetItem(Index: Longint): TFieldDef; procedure SetItem(Index: Longint; const AValue: TFieldDef); public constructor Create(ADataSet: TDataSet); // destructor Destroy; override; procedure Add(const AName: string; ADataType: TFieldType; ASize: Word; ARequired: Boolean); overload; procedure Add(const AName: string; ADataType: TFieldType; ASize: Word); overload; procedure Add(const AName: string; ADataType: TFieldType); overload; Function AddFieldDef : TFieldDef; procedure Assign(FieldDefs: TFieldDefs); overload; function Find(const AName: string): TFieldDef; // procedure Clear; // procedure Delete(Index: Longint); procedure Update; overload; Function MakeNameUnique(const AName : String) : string; virtual; Property HiddenFields : Boolean Read FHiddenFields Write FHiddenFields; property Items[Index: Longint]: TFieldDef read GetItem write SetItem; default; end; { TField } TFieldKind = (fkData, fkCalculated, fkLookup, fkInternalCalc); TFieldKinds = Set of TFieldKind; TFieldNotifyEvent = procedure(Sender: TField) of object; TFieldGetTextEvent = procedure(Sender: TField; var aText: string; DisplayText: Boolean) of object; TFieldSetTextEvent = procedure(Sender: TField; const aText: string) of object; TFieldRef = ^TField; TFieldChars = set of Char; PLookupListRec = ^TLookupListRec; TLookupListRec = record Key: Variant; Value: Variant; end; { TLookupList } TLookupList = class(TObject) private FList: TFPList; public constructor Create; destructor Destroy; override; procedure Add(const AKey, AValue: Variant); procedure Clear; function FirstKeyByValue(const AValue: Variant): Variant; function ValueOfKey(const AKey: Variant): Variant; procedure ValuesToStrings(AStrings: TStrings); end; { TField } TField = class(TComponent) private FAlignment : TAlignment; FAttributeSet : String; FCalculated : Boolean; FConstraintErrorMessage : String; FCustomConstraint : String; FDataSet : TDataSet; // FDataSize : Word; FDataType : TFieldType; FDefaultExpression : String; FDisplayLabel : String; FDisplayWidth : Longint; FEditMask: TEditMask; FFieldKind : TFieldKind; FFieldName : String; FFieldNo : Longint; FFields : TFields; FHasConstraints : Boolean; FImportedConstraint : String; FIsIndexField : Boolean; FKeyFields : String; FLookupCache : Boolean; FLookupDataSet : TDataSet; FLookupKeyfields : String; FLookupresultField : String; FLookupList: TLookupList; FOffset : Word; FOnChange : TFieldNotifyEvent; FOnGetText: TFieldGetTextEvent; FOnSetText: TFieldSetTextEvent; FOnValidate: TFieldNotifyEvent; FOrigin : String; FReadOnly : Boolean; FRequired : Boolean; FSize : integer; FValidChars : TFieldChars; FValueBuffer : Pointer; FValidating : Boolean; FVisible : Boolean; FProviderFlags : TProviderFlags; function GetIndex : longint; function GetLookup: Boolean; procedure SetAlignment(const AValue: TAlignMent); procedure SetIndex(const AValue: Integer); function GetDisplayText: String; function GetEditText: String; procedure SetEditText(const AValue: string); procedure SetDisplayLabel(const AValue: string); procedure SetDisplayWidth(const AValue: Longint); function GetDisplayWidth: integer; procedure SetLookup(const AValue: Boolean); procedure SetReadOnly(const AValue: Boolean); procedure SetVisible(const AValue: Boolean); function IsDisplayStored : Boolean; function GetLookupList: TLookupList; procedure CalcLookupValue; protected function AccessError(const TypeName: string): EDatabaseError; procedure CheckInactive; class procedure CheckTypeSize(AValue: Longint); virtual; procedure Change; virtual; procedure DataChanged; procedure FreeBuffers; virtual; function GetAsBCD: TBCD; virtual; function GetAsBoolean: Boolean; virtual; function GetAsBytes: TBytes; virtual; function GetAsCurrency: Currency; virtual; function GetAsLargeInt: LargeInt; virtual; function GetAsDateTime: TDateTime; virtual; function GetAsFloat: Double; virtual; function GetAsLongint: Longint; virtual; function GetAsInteger: Longint; virtual; function GetAsVariant: variant; virtual; function GetOldValue: variant; virtual; function GetAsString: string; virtual; function GetAsWideString: WideString; virtual; function GetCanModify: Boolean; virtual; function GetClassDesc: String; virtual; function GetDataSize: Integer; virtual; function GetDefaultWidth: Longint; virtual; function GetDisplayName : String; function GetCurValue: Variant; virtual; function GetNewValue: Variant; virtual; function GetIsNull: Boolean; virtual; function GetParentComponent: TComponent; override; procedure GetText(var AText: string; ADisplayText: Boolean); virtual; function HasParent: Boolean; override; procedure Notification(AComponent: TComponent; Operation: TOperation); override; procedure PropertyChanged(LayoutAffected: Boolean); procedure ReadState(Reader: TReader); override; procedure SetAsBCD(const AValue: TBCD); virtual; procedure SetAsBoolean(AValue: Boolean); virtual; procedure SetAsBytes(const AValue: TBytes); virtual; procedure SetAsCurrency(AValue: Currency); virtual; procedure SetAsDateTime(AValue: TDateTime); virtual; procedure SetAsFloat(AValue: Double); virtual; procedure SetAsLongint(AValue: Longint); virtual; procedure SetAsInteger(AValue: Longint); virtual; procedure SetAsLargeint(AValue: Largeint); virtual; procedure SetAsVariant(const AValue: variant); virtual; procedure SetAsString(const AValue: string); virtual; procedure SetAsWideString(const AValue: WideString); virtual; procedure SetDataset(AValue : TDataset); virtual; procedure SetDataType(AValue: TFieldType); procedure SetNewValue(const AValue: Variant); procedure SetSize(AValue: Integer); virtual; procedure SetParentComponent(AParent: TComponent); override; procedure SetText(const AValue: string); virtual; procedure SetVarValue(const AValue: Variant); virtual; public constructor Create(AOwner: TComponent); override; destructor Destroy; override; procedure Assign(Source: TPersistent); override; procedure AssignValue(const AValue: TVarRec); procedure Clear; virtual; procedure FocusControl; function GetData(Buffer: Pointer): Boolean; overload; function GetData(Buffer: Pointer; NativeFormat : Boolean): Boolean; overload; class function IsBlob: Boolean; virtual; function IsValidChar(InputChar: Char): Boolean; virtual; procedure RefreshLookupList; procedure SetData(Buffer: Pointer); overload; procedure SetData(Buffer: Pointer; NativeFormat : Boolean); overload; procedure SetFieldType(AValue: TFieldType); virtual; procedure Validate(Buffer: Pointer); property AsBCD: TBCD read GetAsBCD write SetAsBCD; property AsBoolean: Boolean read GetAsBoolean write SetAsBoolean; property AsBytes: TBytes read GetAsBytes write SetAsBytes; property AsCurrency: Currency read GetAsCurrency write SetAsCurrency; property AsDateTime: TDateTime read GetAsDateTime write SetAsDateTime; property AsFloat: Double read GetAsFloat write SetAsFloat; property AsLongint: Longint read GetAsLongint write SetAsLongint; property AsLargeInt: LargeInt read GetAsLargeInt write SetAsLargeInt; property AsInteger: Longint read GetAsInteger write SetAsInteger; property AsString: string read GetAsString write SetAsString; property AsWideString: WideString read GetAsWideString write SetAsWideString; property AsVariant: variant read GetAsVariant write SetAsVariant; property AttributeSet: string read FAttributeSet write FAttributeSet; property Calculated: Boolean read FCalculated write FCalculated; property CanModify: Boolean read GetCanModify; property CurValue: Variant read GetCurValue; property DataSet: TDataSet read FDataSet write SetDataSet; property DataSize: Integer read GetDataSize; property DataType: TFieldType read FDataType; property DisplayName: String Read GetDisplayName; property DisplayText: String read GetDisplayText; property EditMask: TEditMask read FEditMask write FEditMask; property EditMaskPtr: TEditMask read FEditMask; property FieldNo: Longint read FFieldNo; property IsIndexField: Boolean read FIsIndexField; property IsNull: Boolean read GetIsNull; property Lookup: Boolean read GetLookup write SetLookup; property NewValue: Variant read GetNewValue write SetNewValue; property Offset: word read FOffset; property Size: Integer read FSize write SetSize; property Text: string read GetEditText write SetEditText; property ValidChars : TFieldChars read FValidChars write FValidChars; property Value: variant read GetAsVariant write SetAsVariant; property OldValue: variant read GetOldValue; property LookupList: TLookupList read GetLookupList; published property Alignment : TAlignment read FAlignment write SetAlignment default taLeftJustify; property CustomConstraint: string read FCustomConstraint write FCustomConstraint; property ConstraintErrorMessage: string read FConstraintErrorMessage write FConstraintErrorMessage; property DefaultExpression: string read FDefaultExpression write FDefaultExpression; property DisplayLabel : string read GetDisplayName write SetDisplayLabel stored IsDisplayStored; property DisplayWidth: Longint read GetDisplayWidth write SetDisplayWidth; property FieldKind: TFieldKind read FFieldKind write FFieldKind; property FieldName: string read FFieldName write FFieldName; property HasConstraints: Boolean read FHasConstraints; property Index: Longint read GetIndex write SetIndex; property ImportedConstraint: string read FImportedConstraint write FImportedConstraint; property KeyFields: string read FKeyFields write FKeyFields; property LookupCache: Boolean read FLookupCache write FLookupCache; property LookupDataSet: TDataSet read FLookupDataSet write FLookupDataSet; property LookupKeyFields: string read FLookupKeyFields write FLookupKeyFields; property LookupResultField: string read FLookupResultField write FLookupResultField; property Origin: string read FOrigin write FOrigin; property ProviderFlags : TProviderFlags read FProviderFlags write FProviderFlags; property ReadOnly: Boolean read FReadOnly write SetReadOnly; property Required: Boolean read FRequired write FRequired; property Visible: Boolean read FVisible write SetVisible default True; property OnChange: TFieldNotifyEvent read FOnChange write FOnChange; property OnGetText: TFieldGetTextEvent read FOnGetText write FOnGetText; property OnSetText: TFieldSetTextEvent read FOnSetText write FOnSetText; property OnValidate: TFieldNotifyEvent read FOnValidate write FOnValidate; end; { TStringField } TStringField = class(TField) private FFixedChar : boolean; FTransliterate : Boolean; protected class procedure CheckTypeSize(AValue: Longint); override; function GetAsBoolean: Boolean; override; function GetAsDateTime: TDateTime; override; function GetAsFloat: Double; override; function GetAsInteger: Longint; override; function GetAsString: string; override; function GetAsVariant: variant; override; function GetDataSize: Integer; override; function GetDefaultWidth: Longint; override; procedure GetText(var AText: string; ADisplayText: Boolean); override; function GetValue(var AValue: string): Boolean; procedure SetAsBoolean(AValue: Boolean); override; procedure SetAsDateTime(AValue: TDateTime); override; procedure SetAsFloat(AValue: Double); override; procedure SetAsInteger(AValue: Longint); override; procedure SetAsString(const AValue: string); override; procedure SetVarValue(const AValue: Variant); override; public constructor Create(AOwner: TComponent); override; procedure SetFieldType(AValue: TFieldType); override; property FixedChar : Boolean read FFixedChar write FFixedChar; property Transliterate: Boolean read FTransliterate write FTransliterate; property Value: String read GetAsString write SetAsString; published property EditMask; property Size default 20; end; { TWideStringField } TWideStringField = class(TStringField) protected class procedure CheckTypeSize(AValue: Integer); override; function GetValue(var AValue: WideString): Boolean; function GetAsString: string; override; procedure SetAsString(const AValue: string); override; function GetAsVariant: Variant; override; procedure SetVarValue(const AValue: Variant); override; function GetAsWideString: WideString; override; procedure SetAsWideString(const AValue: WideString); override; function GetDataSize: Integer; override; public constructor Create(aOwner: TComponent); override; procedure SetFieldType(AValue: TFieldType); override; property Value: WideString read GetAsWideString write SetAsWideString; end; { TNumericField } TNumericField = class(TField) Private FDisplayFormat : String; FEditFormat : String; protected class procedure CheckTypeSize(AValue: Longint); override; procedure RangeError(AValue, Min, Max: Double); procedure SetDisplayFormat(const AValue: string); procedure SetEditFormat(const AValue: string); function GetAsBoolean: Boolean; override; Procedure SetAsBoolean(AValue: Boolean); override; public constructor Create(AOwner: TComponent); override; published property Alignment default taRightJustify; property DisplayFormat: string read FDisplayFormat write SetDisplayFormat; property EditFormat: string read FEditFormat write SetEditFormat; end; { TLongintField } TLongintField = class(TNumericField) private FMinValue, FMaxValue, FMinRange, FMaxRange : Longint; Procedure SetMinValue (AValue : longint); Procedure SetMaxValue (AValue : longint); protected function GetAsFloat: Double; override; function GetAsInteger: Longint; override; function GetAsString: string; override; function GetAsVariant: variant; override; function GetDataSize: Integer; override; procedure GetText(var AText: string; ADisplayText: Boolean); override; function GetValue(var AValue: Longint): Boolean; procedure SetAsFloat(AValue: Double); override; procedure SetAsInteger(AValue: Longint); override; procedure SetAsString(const AValue: string); override; procedure SetVarValue(const AValue: Variant); override; function GetAsLargeint: Largeint; override; procedure SetAsLargeint(AValue: Largeint); override; public constructor Create(AOwner: TComponent); override; Function CheckRange(AValue : Longint) : Boolean; property Value: Longint read GetAsInteger write SetAsInteger; published property MaxValue: Longint read FMaxValue write SetMaxValue default 0; property MinValue: Longint read FMinValue write SetMinValue default 0; end; TIntegerField = Class(TLongintField); { TLargeintField } TLargeintField = class(TNumericField) private FMinValue, FMaxValue, FMinRange, FMaxRange : Largeint; Procedure SetMinValue (AValue : Largeint); Procedure SetMaxValue (AValue : Largeint); protected function GetAsFloat: Double; override; function GetAsInteger: Longint; override; function GetAsLargeint: Largeint; override; function GetAsString: string; override; function GetAsVariant: variant; override; function GetDataSize: Integer; override; procedure GetText(var AText: string; ADisplayText: Boolean); override; function GetValue(var AValue: Largeint): Boolean; procedure SetAsFloat(AValue: Double); override; procedure SetAsInteger(AValue: Longint); override; procedure SetAsLargeint(AValue: Largeint); override; procedure SetAsString(const AValue: string); override; procedure SetVarValue(const AValue: Variant); override; public constructor Create(AOwner: TComponent); override; Function CheckRange(AValue : largeint) : Boolean; property Value: Largeint read GetAsLargeint write SetAsLargeint; published property MaxValue: Largeint read FMaxValue write SetMaxValue default 0; property MinValue: Largeint read FMinValue write SetMinValue default 0; end; { TSmallintField } TSmallintField = class(TLongintField) protected function GetDataSize: Integer; override; public constructor Create(AOwner: TComponent); override; end; { TWordField } TWordField = class(TLongintField) protected function GetDataSize: Integer; override; public constructor Create(AOwner: TComponent); override; end; { TAutoIncField } TAutoIncField = class(TLongintField) Protected procedure SetAsInteger(AValue: Longint); override; public constructor Create(AOwner: TComponent); override; end; { TFloatField } TFloatField = class(TNumericField) private FCurrency: Boolean; FMaxValue : Double; FMinValue : Double; FPrecision : Longint; procedure SetCurrency(const AValue: Boolean); procedure SetPrecision(const AValue: Longint); protected function GetAsFloat: Double; override; function GetAsLargeInt: LargeInt; override; function GetAsInteger: Longint; override; function GetAsVariant: variant; override; function GetAsString: string; override; function GetDataSize: Integer; override; procedure GetText(var theText: string; ADisplayText: Boolean); override; procedure SetAsFloat(AValue: Double); override; procedure SetAsLargeInt(AValue: LargeInt); override; procedure SetAsInteger(AValue: Longint); override; procedure SetAsString(const AValue: string); override; procedure SetVarValue(const AValue: Variant); override; public constructor Create(AOwner: TComponent); override; Function CheckRange(AValue : Double) : Boolean; property Value: Double read GetAsFloat write SetAsFloat; published property Currency: Boolean read FCurrency write SetCurrency default False; property MaxValue: Double read FMaxValue write FMaxValue; property MinValue: Double read FMinValue write FMinValue; property Precision: Longint read FPrecision write SetPrecision default 15; // min 2 instellen, delphi compat end; { TCurrencyField } TCurrencyField = class(TFloatField) public constructor Create(AOwner: TComponent); override; published property Currency default True; end; { TBooleanField } TBooleanField = class(TField) private FDisplayValues : String; // First byte indicates uppercase or not. FDisplays : Array[Boolean,Boolean] of string; Procedure SetDisplayValues(const AValue : String); protected function GetAsBoolean: Boolean; override; function GetAsString: string; override; function GetAsVariant: variant; override; function GetAsInteger: Longint; override; function GetDataSize: Integer; override; function GetDefaultWidth: Longint; override; procedure SetAsBoolean(AValue: Boolean); override; procedure SetAsString(const AValue: string); override; procedure SetAsInteger(AValue: Longint); override; procedure SetVarValue(const AValue: Variant); override; public constructor Create(AOwner: TComponent); override; property Value: Boolean read GetAsBoolean write SetAsBoolean; published property DisplayValues: string read FDisplayValues write SetDisplayValues; end; { TDateTimeField } TDateTimeField = class(TField) private FDisplayFormat : String; procedure SetDisplayFormat(const AValue: string); protected function GetAsDateTime: TDateTime; override; function GetAsFloat: Double; override; function GetAsString: string; override; function GetAsVariant: variant; override; function GetDataSize: Integer; override; procedure GetText(var theText: string; ADisplayText: Boolean); override; procedure SetAsDateTime(AValue: TDateTime); override; procedure SetAsFloat(AValue: Double); override; procedure SetAsString(const AValue: string); override; procedure SetVarValue(const AValue: Variant); override; public constructor Create(AOwner: TComponent); override; property Value: TDateTime read GetAsDateTime write SetAsDateTime; published property DisplayFormat: string read FDisplayFormat write SetDisplayFormat; property EditMask; end; { TDateField } TDateField = class(TDateTimeField) public constructor Create(AOwner: TComponent); override; end; { TTimeField } TTimeField = class(TDateTimeField) protected procedure SetAsString(const AValue: string); override; public constructor Create(AOwner: TComponent); override; end; { TBinaryField } TBinaryField = class(TField) protected class procedure CheckTypeSize(AValue: Longint); override; function GetAsBytes: TBytes; override; function GetAsString: string; override; function GetAsVariant: Variant; override; procedure GetText(var TheText: string; ADisplayText: Boolean); override; function GetValue(var AValue: TBytes): Boolean; procedure SetAsBytes(const AValue: TBytes); override; procedure SetAsString(const AValue: string); override; procedure SetText(const AValue: string); override; procedure SetVarValue(const AValue: Variant); override; public constructor Create(AOwner: TComponent); override; published property Size default 16; end; { TBytesField } TBytesField = class(TBinaryField) protected function GetDataSize: Integer; override; public constructor Create(AOwner: TComponent); override; end; { TVarBytesField } TVarBytesField = class(TBytesField) protected function GetDataSize: Integer; override; public constructor Create(AOwner: TComponent); override; end; { TBCDField } TBCDField = class(TNumericField) private FMinValue, FMaxValue : currency; FPrecision : Longint; FCurrency : boolean; protected class procedure CheckTypeSize(AValue: Longint); override; function GetAsBCD: TBCD; override; function GetAsCurrency: Currency; override; function GetAsFloat: Double; override; function GetAsInteger: Longint; override; function GetAsString: string; override; function GetValue(var AValue: Currency): Boolean; function GetAsVariant: variant; override; function GetDataSize: Integer; override; function GetDefaultWidth: Longint; override; procedure GetText(var TheText: string; ADisplayText: Boolean); override; procedure SetAsBCD(const AValue: TBCD); override; procedure SetAsFloat(AValue: Double); override; procedure SetAsInteger(AValue: Longint); override; procedure SetAsString(const AValue: string); override; procedure SetAsCurrency(AValue: Currency); override; procedure SetVarValue(const AValue: Variant); override; public constructor Create(AOwner: TComponent); override; Function CheckRange(AValue : Currency) : Boolean; property Value: Currency read GetAscurrency write SetAscurrency; published property Precision: Longint read FPrecision write FPrecision; property Currency: Boolean read FCurrency write FCurrency; property MaxValue: Currency read FMaxValue write FMaxValue; property MinValue: Currency read FMinValue write FMinValue; property Size default 4; end; { TFMTBCDField } TFMTBCDField = class(TNumericField) private FMinValue, FMaxValue : TBCD; FPrecision : Longint; FCurrency : boolean; function GetMaxValue: string; function GetMinValue: string; procedure SetMaxValue(const AValue: string); procedure SetMinValue(const AValue: string); protected class procedure CheckTypeSize(AValue: Longint); override; function GetAsBCD: TBCD; override; function GetAsCurrency: Currency; override; function GetAsFloat: Double; override; function GetAsLargeInt: LargeInt; override; function GetAsInteger: Longint; override; function GetAsString: string; override; function GetAsVariant: variant; override; function GetDataSize: Integer; override; function GetDefaultWidth: Longint; override; procedure GetText(var TheText: string; ADisplayText: Boolean); override; procedure SetAsBCD(const AValue: TBCD); override; procedure SetAsFloat(AValue: Double); override; procedure SetAsLargeInt(AValue: LargeInt); override; procedure SetAsInteger(AValue: Longint); override; procedure SetAsString(const AValue: string); override; procedure SetAsCurrency(AValue: Currency); override; procedure SetVarValue(const AValue: Variant); override; public constructor Create(AOwner: TComponent); override; function CheckRange(AValue : TBCD) : Boolean; property Value: TBCD read GetAsBCD write SetAsBCD; published property Precision: Longint read FPrecision write FPrecision default 15; property Currency: Boolean read FCurrency write FCurrency; property MaxValue: string read GetMaxValue write SetMaxValue; property MinValue: string read GetMinValue write SetMinValue; property Size default 4; end; { TBlobField } TBlobStreamMode = (bmRead, bmWrite, bmReadWrite); TBlobType = ftBlob..ftWideMemo; TBlobField = class(TField) private FBlobType : TBlobType; FModified : Boolean; FTransliterate : Boolean; Function GetBlobStream (Mode : TBlobStreamMode) : TStream; protected procedure FreeBuffers; override; function GetAsBytes: TBytes; override; function GetAsString: string; override; function GetAsVariant: Variant; override; function GetAsWideString: WideString; override; function GetBlobSize: Longint; virtual; function GetIsNull: Boolean; override; procedure GetText(var TheText: string; ADisplayText: Boolean); override; procedure SetAsBytes(const AValue: TBytes); override; procedure SetAsString(const AValue: string); override; procedure SetText(const AValue: string); override; procedure SetVarValue(const AValue: Variant); override; procedure SetAsWideString(const AValue: WideString); override; public constructor Create(AOwner: TComponent); override; procedure Clear; override; class function IsBlob: Boolean; override; procedure LoadFromFile(const FileName: string); procedure LoadFromStream(Stream: TStream); procedure SaveToFile(const FileName: string); procedure SaveToStream(Stream: TStream); procedure SetFieldType(AValue: TFieldType); override; property BlobSize: Longint read GetBlobSize; property Modified: Boolean read FModified write FModified; property Value: string read GetAsString write SetAsString; property Transliterate: Boolean read FTransliterate write FTransliterate; published property BlobType: TBlobType read FBlobType write FBlobType; property Size default 0; end; { TMemoField } TMemoField = class(TBlobField) protected function GetAsWideString: WideString; override; procedure SetAsWideString(const AValue: WideString); override; public constructor Create(AOwner: TComponent); override; published property Transliterate default True; end; { TWideMemoField } TWideMemoField = class(TBlobField) protected function GetAsVariant: Variant; override; procedure SetVarValue(const AValue: Variant); override; function GetAsString: string; override; procedure SetAsString(const AValue: string); override; public constructor Create(aOwner: TComponent); override; property Value: WideString read GetAsWideString write SetAsWideString; published end; { TGraphicField } TGraphicField = class(TBlobField) public constructor Create(AOwner: TComponent); override; end; { TVariantField } TVariantField = class(TField) protected class procedure CheckTypeSize(aValue: Integer); override; function GetAsBoolean: Boolean; override; procedure SetAsBoolean(aValue: Boolean); override; function GetAsDateTime: TDateTime; override; procedure SetAsDateTime(aValue: TDateTime); override; function GetAsFloat: Double; override; procedure SetAsFloat(aValue: Double); override; function GetAsInteger: Longint; override; procedure SetAsInteger(AValue: Longint); override; function GetAsString: string; override; procedure SetAsString(const aValue: string); override; function GetAsWideString: WideString; override; procedure SetAsWideString(const aValue: WideString); override; function GetAsVariant: Variant; override; procedure SetVarValue(const aValue: Variant); override; function GetDefaultWidth: Integer; override; public constructor Create(AOwner: TComponent); override; end; { TGuidField } TGuidField = class(TStringField) protected class procedure CheckTypeSize(AValue: Longint); override; function GetDefaultWidth: Longint; override; function GetAsGuid: TGUID; procedure SetAsGuid(const AValue: TGUID); public constructor Create(AOwner: TComponent); override; property AsGuid: TGUID read GetAsGuid write SetAsGuid; end; { TIndexDef } TIndexDefs = class; TIndexOption = (ixPrimary, ixUnique, ixDescending, ixCaseInsensitive, ixExpression, ixNonMaintained); TIndexOptions = set of TIndexOption; TIndexDef = class(TNamedItem) Private FCaseinsFields: string; FDescFields: string; FExpression : String; FFields : String; FOptions : TIndexOptions; FSource : String; protected procedure Assign(Source: TPersistent); override; function GetExpression: string; procedure SetCaseInsFields(const AValue: string); virtual; procedure SetDescFields(const AValue: string); procedure SetExpression(const AValue: string); public constructor Create(Owner: TIndexDefs; const AName, TheFields: string; TheOptions: TIndexOptions); overload; property Expression: string read GetExpression write SetExpression; property Fields: string read FFields write FFields; property CaseInsFields: string read FCaseinsFields write SetCaseInsFields; property DescFields: string read FDescFields write SetDescFields; property Options: TIndexOptions read FOptions write FOptions; property Source: string read FSource write FSource; end; { TIndexDefs } TIndexDefs = class(TDefCollection) Private Function GetItem(Index: Integer): TIndexDef; Procedure SetItem(Index: Integer; Value: TIndexDef); public constructor Create(ADataSet: TDataSet); virtual; overload; procedure Add(const Name, Fields: string; Options: TIndexOptions); Function AddIndexDef: TIndexDef; function Find(const IndexName: string): TIndexDef; function FindIndexForFields(const Fields: string): TIndexDef; function GetIndexForFields(const Fields: string; CaseInsensitive: Boolean): TIndexDef; procedure Update; overload; virtual; Property Items[Index: Integer] : TIndexDef read GetItem write SetItem; default; end; { TCheckConstraint } TCheckConstraint = class(TCollectionItem) Private FCustomConstraint : String; FErrorMessage : String; FFromDictionary : Boolean; FImportedConstraint : String; public procedure Assign(Source: TPersistent); override; // function GetDisplayName: string; override; published property CustomConstraint: string read FCustomConstraint write FCustomConstraint; property ErrorMessage: string read FErrorMessage write FErrorMessage; property FromDictionary: Boolean read FFromDictionary write FFromDictionary; property ImportedConstraint: string read FImportedConstraint write FImportedConstraint; end; { TCheckConstraints } TCheckConstraints = class(TCollection) Private Function GetItem(Index : Longint) : TCheckConstraint; Procedure SetItem(index : Longint; Value : TCheckConstraint); protected function GetOwner: TPersistent; override; public constructor Create(AOwner: TPersistent); function Add: TCheckConstraint; property Items[Index: Longint]: TCheckConstraint read GetItem write SetItem; default; end; { TFieldsEnumerator } TFieldsEnumerator = class private FPosition: Integer; FFields: TFields; function GetCurrent: TField; public constructor Create(AFields: TFields); function MoveNext: Boolean; property Current: TField read GetCurrent; end; { TFields } TFields = Class(TObject) Private FDataset : TDataset; FFieldList : TFpList; FOnChange : TNotifyEvent; FValidFieldKinds : TFieldKinds; Protected Procedure Changed; Procedure CheckfieldKind(Fieldkind : TFieldKind; Field : TField); Function GetCount : Longint; Function GetField (Index : longint) : TField; Procedure SetField(Index: Integer; Value: TField); Procedure SetFieldIndex (Field : TField;Value : Integer); Property OnChange : TNotifyEvent Read FOnChange Write FOnChange; Property ValidFieldKinds : TFieldKinds Read FValidFieldKinds; Public Constructor Create(ADataset : TDataset); Destructor Destroy;override; Procedure Add(Field : TField); Procedure CheckFieldName (Const Value : String); Procedure CheckFieldNames (Const Value : String); Procedure Clear; Function FindField (Const Value : String) : TField; Function FieldByName (Const Value : String) : TField; Function FieldByNumber(FieldNo : Integer) : TField; Function GetEnumerator: TFieldsEnumerator; Procedure GetFieldNames (Values : TStrings); Function IndexOf(Field : TField) : Longint; procedure Remove(Value : TField); Property Count : Integer Read GetCount; Property Dataset : TDataset Read FDataset; Property Fields [Index : Integer] : TField Read GetField Write SetField; default; end; { TParam } TBlobData = AnsiString; // Delphi defines it as alias to TBytes TParamBinding = array of integer; TParamType = (ptUnknown, ptInput, ptOutput, ptInputOutput, ptResult); TParamTypes = set of TParamType; TParamStyle = (psInterbase,psPostgreSQL,psSimulated); TParams = class; TParam = class(TCollectionItem) private FNativeStr: string; FValue: Variant; FPrecision: Integer; FNumericScale: Integer; FName: string; FDataType: TFieldType; FBound: Boolean; FParamType: TParamType; FSize: Integer; Function GetDataSet: TDataSet; Function IsParamStored: Boolean; protected Procedure AssignParam(Param: TParam); Procedure AssignTo(Dest: TPersistent); override; Function GetAsBoolean: Boolean; Function GetAsCurrency: Currency; Function GetAsDateTime: TDateTime; Function GetAsFloat: Double; Function GetAsInteger: Longint; Function GetAsLargeInt: LargeInt; Function GetAsMemo: string; Function GetAsString: string; Function GetAsVariant: Variant; Function GetAsFMTBCD: TBCD; Function GetDisplayName: string; override; Function GetIsNull: Boolean; Function IsEqual(AValue: TParam): Boolean; Procedure SetAsBlob(const AValue: TBlobData); Procedure SetAsBoolean(AValue: Boolean); Procedure SetAsCurrency(const AValue: Currency); Procedure SetAsDate(const AValue: TDateTime); Procedure SetAsDateTime(const AValue: TDateTime); Procedure SetAsFloat(const AValue: Double); Procedure SetAsInteger(AValue: Longint); Procedure SetAsLargeInt(AValue: LargeInt); Procedure SetAsMemo(const AValue: string); Procedure SetAsSmallInt(AValue: LongInt); Procedure SetAsString(const AValue: string); Procedure SetAsTime(const AValue: TDateTime); Procedure SetAsVariant(const AValue: Variant); Procedure SetAsWord(AValue: LongInt); Procedure SetAsFMTBCD(const AValue: TBCD); Procedure SetDataType(AValue: TFieldType); Procedure SetText(const AValue: string); function GetAsWideString: WideString; procedure SetAsWideString(const AValue: WideString); public constructor Create(ACollection: TCollection); overload; override; constructor Create(AParams: TParams; AParamType: TParamType); reintroduce; overload; Procedure Assign(Source: TPersistent); override; Procedure AssignField(Field: TField); Procedure AssignToField(Field: TField); Procedure AssignFieldValue(Field: TField; const AValue: Variant); procedure AssignFromField(Field : TField); Procedure Clear; Procedure GetData(Buffer: Pointer); Function GetDataSize: Integer; Procedure LoadFromFile(const FileName: string; BlobType: TBlobType); Procedure LoadFromStream(Stream: TStream; BlobType: TBlobType); Procedure SetBlobData(Buffer: Pointer; ASize: Integer); Procedure SetData(Buffer: Pointer); Property AsBlob : TBlobData read GetAsString write SetAsBlob; Property AsBoolean : Boolean read GetAsBoolean write SetAsBoolean; Property AsCurrency : Currency read GetAsCurrency write SetAsCurrency; Property AsDate : TDateTime read GetAsDateTime write SetAsDate; Property AsDateTime : TDateTime read GetAsDateTime write SetAsDateTime; Property AsFloat : Double read GetAsFloat write SetAsFloat; Property AsInteger : LongInt read GetAsInteger write SetAsInteger; Property AsLargeInt : LargeInt read GetAsLargeInt write SetAsLargeInt; Property AsMemo : string read GetAsMemo write SetAsMemo; Property AsSmallInt : LongInt read GetAsInteger write SetAsSmallInt; Property AsString : string read GetAsString write SetAsString; Property AsTime : TDateTime read GetAsDateTime write SetAsTime; Property AsWord : LongInt read GetAsInteger write SetAsWord; Property AsFMTBCD: TBCD read GetAsFMTBCD write SetAsFMTBCD; Property Bound : Boolean read FBound write FBound; Property Dataset : TDataset Read GetDataset; Property IsNull : Boolean read GetIsNull; Property NativeStr : string read FNativeStr write FNativeStr; Property Text : string read GetAsString write SetText; Property Value : Variant read GetAsVariant write SetAsVariant stored IsParamStored; property AsWideString: WideString read GetAsWideString write SetAsWideString; published Property DataType : TFieldType read FDataType write SetDataType; Property Name : string read FName write FName; Property NumericScale : Integer read FNumericScale write FNumericScale default 0; Property ParamType : TParamType read FParamType write FParamType; Property Precision : Integer read FPrecision write FPrecision default 0; Property Size : Integer read FSize write FSize default 0; end; { TParams } TParams = class(TCollection) private FOwner: TPersistent; Function GetItem(Index: Integer): TParam; Function GetParamValue(const ParamName: string): Variant; Procedure SetItem(Index: Integer; Value: TParam); Procedure SetParamValue(const ParamName: string; const Value: Variant); protected Procedure AssignTo(Dest: TPersistent); override; Function GetDataSet: TDataSet; Function GetOwner: TPersistent; override; public Constructor Create(AOwner: TPersistent); overload; Constructor Create; overload; Procedure AddParam(Value: TParam); Procedure AssignValues(Value: TParams); Function CreateParam(FldType: TFieldType; const ParamName: string; ParamType: TParamType): TParam; Function FindParam(const Value: string): TParam; Procedure GetParamList(List: TList; const ParamNames: string); Function IsEqual(Value: TParams): Boolean; Function ParamByName(const Value: string): TParam; Function ParseSQL(SQL: String; DoCreate: Boolean): String; overload; Function ParseSQL(SQL: String; DoCreate, EscapeSlash, EscapeRepeat : Boolean; ParameterStyle : TParamStyle): String; overload; Function ParseSQL(SQL: String; DoCreate, EscapeSlash, EscapeRepeat : Boolean; ParameterStyle : TParamStyle; out ParamBinding: TParambinding): String; overload; Function ParseSQL(SQL: String; DoCreate, EscapeSlash, EscapeRepeat : Boolean; ParameterStyle : TParamStyle; out ParamBinding: TParambinding; out ReplaceString : string): String; overload; Procedure RemoveParam(Value: TParam); Procedure CopyParamValuesFromDataset(ADataset : TDataset; CopyBound : Boolean); Property Dataset : TDataset Read GetDataset; Property Items[Index: Integer] : TParam read GetItem write SetItem; default; Property ParamValues[const ParamName: string] : Variant read GetParamValue write SetParamValue; end; { TDataSet } TBookmark = Pointer; // will change to TBytes in 2.7.x and higher. TBookmarkStr = string deprecated 'TBookmarkStr will disappear in 2.7.x and higher in favour of TBookmark'; PBookmarkFlag = ^TBookmarkFlag; TBookmarkFlag = (bfCurrent, bfBOF, bfEOF, bfInserted); { These types are used by Delphi/Unicode to replace the ambiguous "pchar" buffer types. For now, they are just aliases to PAnsiChar, but in Delphi/Unicode it is pbyte. This will be changed later (2.8?), to allow a grace period for descendents to catch up. Testing with TRecordBuffer=PByte will turn up typing problems. TRecordBuffer=pansichar is backwards compatible, even if overriden with "pchar" variants. } TRecordBufferBaseType = AnsiChar; // must match TRecordBuffer. TRecordBuffer = PAnsiChar; PBufferList = ^TBufferList; TBufferList = array[0..dsMaxBufferCount - 1] of TRecordBuffer; // Dynamic array in Delphi. TBufferArray = ^TRecordBuffer; TGetMode = (gmCurrent, gmNext, gmPrior); TGetResult = (grOK, grBOF, grEOF, grError); TResyncMode = set of (rmExact, rmCenter); TDataAction = (daFail, daAbort, daRetry); TUpdateAction = (uaFail, uaAbort, uaSkip, uaRetry, uaApplied); TUpdateKind = (ukModify, ukInsert, ukDelete); TLocateOption = (loCaseInsensitive, loPartialKey); TLocateOptions = set of TLocateOption; TDataOperation = procedure of object; TDataSetNotifyEvent = procedure(DataSet: TDataSet) of object; TDataSetErrorEvent = procedure(DataSet: TDataSet; E: EDatabaseError; var DataAction: TDataAction) of object; TFilterOption = (foCaseInsensitive, foNoPartialCompare); TFilterOptions = set of TFilterOption; TFilterRecordEvent = procedure(DataSet: TDataSet; var Accept: Boolean) of object; TDatasetClass = Class of TDataset; {------------------------------------------------------------------------------} {IProviderSupport interface} TPSCommandType = ( ctUnknown, ctQuery, ctTable, ctStoredProc, ctSelect, ctInsert, ctUpdate, ctDelete, ctDDL ); IProviderSupport = interface procedure PSEndTransaction(ACommit: Boolean); procedure PSExecute; function PSExecuteStatement(const ASQL: string; AParams: TParams; ResultSet: Pointer = nil): Integer; procedure PSGetAttributes(List: TList); function PSGetCommandText: string; function PSGetCommandType: TPSCommandType; function PSGetDefaultOrder: TIndexDef; function PSGetIndexDefs(IndexTypes: TIndexOptions = [ixPrimary..ixNonMaintained]) : TIndexDefs; function PSGetKeyFields: string; function PSGetParams: TParams; function PSGetQuoteChar: string; function PSGetTableName: string; function PSGetUpdateException(E: Exception; Prev: EUpdateError): EUpdateError; function PSInTransaction: Boolean; function PSIsSQLBased: Boolean; function PSIsSQLSupported: Boolean; procedure PSReset; procedure PSSetCommandText(const CommandText: string); procedure PSSetParams(AParams: TParams); procedure PSStartTransaction; function PSUpdateRecord(UpdateKind: TUpdateKind; Delta: TDataSet): Boolean; end; {------------------------------------------------------------------------------} TDataSet = class(TComponent) Private FOpenAfterRead : boolean; FActiveRecord: Longint; FAfterCancel: TDataSetNotifyEvent; FAfterClose: TDataSetNotifyEvent; FAfterDelete: TDataSetNotifyEvent; FAfterEdit: TDataSetNotifyEvent; FAfterInsert: TDataSetNotifyEvent; FAfterOpen: TDataSetNotifyEvent; FAfterPost: TDataSetNotifyEvent; FAfterRefresh: TDataSetNotifyEvent; FAfterScroll: TDataSetNotifyEvent; FAutoCalcFields: Boolean; FBOF: Boolean; FBeforeCancel: TDataSetNotifyEvent; FBeforeClose: TDataSetNotifyEvent; FBeforeDelete: TDataSetNotifyEvent; FBeforeEdit: TDataSetNotifyEvent; FBeforeInsert: TDataSetNotifyEvent; FBeforeOpen: TDataSetNotifyEvent; FBeforePost: TDataSetNotifyEvent; FBeforeRefresh: TDataSetNotifyEvent; FBeforeScroll: TDataSetNotifyEvent; FBlobFieldCount: Longint; FBlockReadSize: Integer; FBookmarkSize: Longint; FBuffers : TBufferArray; FBufferCount: Longint; FCalcBuffer: TRecordBuffer; FCalcFieldsSize: Longint; FConstraints: TCheckConstraints; FDisableControlsCount : Integer; FDisableControlsState : TDatasetState; FCurrentRecord: Longint; FDataSources : TList; FDefaultFields: Boolean; FEOF: Boolean; FEnableControlsEvent : TDataEvent; FFieldList : TFields; FFieldDefs: TFieldDefs; FFilterOptions: TFilterOptions; FFilterText: string; FFiltered: Boolean; FFound: Boolean; FInternalCalcFields: Boolean; FModified: Boolean; FOnCalcFields: TDataSetNotifyEvent; FOnDeleteError: TDataSetErrorEvent; FOnEditError: TDataSetErrorEvent; FOnFilterRecord: TFilterRecordEvent; FOnNewRecord: TDataSetNotifyEvent; FOnPostError: TDataSetErrorEvent; FRecordCount: Longint; FIsUniDirectional: Boolean; FState : TDataSetState; FInternalOpenComplete: Boolean; Procedure DoInsertAppend(DoAppend : Boolean); Procedure DoInternalOpen; Function GetBuffer (Index : longint) : TRecordBuffer; Function GetField (Index : Longint) : TField; Procedure RegisterDataSource(ADataSource : TDataSource); Procedure RemoveField (Field : TField); procedure SetConstraints(Value: TCheckConstraints); Procedure SetField (Index : Longint;Value : TField); Procedure ShiftBuffersForward; Procedure ShiftBuffersBackward; Function TryDoing (P : TDataOperation; Ev : TDatasetErrorEvent) : Boolean; Function GetActive : boolean; Procedure UnRegisterDataSource(ADataSource : TDataSource); Procedure UpdateFieldDefs; procedure SetBlockReadSize(AValue: Integer); virtual; Procedure SetFieldDefs(AFieldDefs: TFieldDefs); procedure DoInsertAppendRecord(const Values: array of const; DoAppend : boolean); protected procedure RecalcBufListSize; procedure ActivateBuffers; virtual; procedure BindFields(Binding: Boolean); procedure BlockReadNext; virtual; function BookmarkAvailable: Boolean; procedure CalculateFields(Buffer: TRecordBuffer); virtual; procedure CheckActive; virtual; procedure CheckInactive; virtual; procedure CheckBiDirectional; procedure Loaded; override; procedure ClearBuffers; virtual; procedure ClearCalcFields(Buffer: TRecordBuffer); virtual; procedure CloseBlob(Field: TField); virtual; procedure CloseCursor; virtual; procedure CreateFields; virtual; procedure DataEvent(Event: TDataEvent; Info: Ptrint); virtual; procedure DestroyFields; virtual; procedure DoAfterCancel; virtual; procedure DoAfterClose; virtual; procedure DoAfterDelete; virtual; procedure DoAfterEdit; virtual; procedure DoAfterInsert; virtual; procedure DoAfterOpen; virtual; procedure DoAfterPost; virtual; procedure DoAfterScroll; virtual; procedure DoAfterRefresh; virtual; procedure DoBeforeCancel; virtual; procedure DoBeforeClose; virtual; procedure DoBeforeDelete; virtual; procedure DoBeforeEdit; virtual; procedure DoBeforeInsert; virtual; procedure DoBeforeOpen; virtual; procedure DoBeforePost; virtual; procedure DoBeforeScroll; virtual; procedure DoBeforeRefresh; virtual; procedure DoOnCalcFields; virtual; procedure DoOnNewRecord; virtual; function FieldByNumber(FieldNo: Longint): TField; function FindRecord(Restart, GoForward: Boolean): Boolean; virtual; procedure FreeFieldBuffers; virtual; function GetBookmarkStr: TBookmarkStr; virtual; procedure GetCalcFields(Buffer: TRecordBuffer); virtual; function GetCanModify: Boolean; virtual; procedure GetChildren(Proc: TGetChildProc; Root: TComponent); override; function GetFieldClass(FieldType: TFieldType): TFieldClass; virtual; Function GetfieldCount : Integer; function GetFieldValues(const fieldname : string) : Variant; virtual; function GetIsIndexField(Field: TField): Boolean; virtual; function GetIndexDefs(IndexDefs : TIndexDefs; IndexTypes : TIndexOptions) : TIndexDefs; function GetNextRecords: Longint; virtual; function GetNextRecord: Boolean; virtual; function GetPriorRecords: Longint; virtual; function GetPriorRecord: Boolean; virtual; function GetRecordCount: Longint; virtual; function GetRecNo: Longint; virtual; procedure InitFieldDefs; virtual; procedure InitFieldDefsFromfields; procedure InitRecord(Buffer: TRecordBuffer); virtual; procedure InternalCancel; virtual; procedure InternalEdit; virtual; procedure InternalInsert; virtual; procedure InternalRefresh; virtual; procedure OpenCursor(InfoQuery: Boolean); virtual; procedure OpenCursorcomplete; virtual; procedure RefreshInternalCalcFields(Buffer: TRecordBuffer); virtual; procedure RestoreState(const Value: TDataSetState); Procedure SetActive (Value : Boolean); virtual; procedure SetBookmarkStr(const Value: TBookmarkStr); virtual; procedure SetBufListSize(Value: Longint); virtual; procedure SetChildOrder(Component: TComponent; Order: Longint); override; procedure SetCurrentRecord(Index: Longint); virtual; procedure SetDefaultFields(const Value: Boolean); procedure SetFiltered(Value: Boolean); virtual; procedure SetFilterOptions(Value: TFilterOptions); virtual; procedure SetFilterText(const Value: string); virtual; procedure SetFieldValues(const fieldname: string; Value: Variant); virtual; procedure SetFound(const Value: Boolean); virtual; procedure SetModified(Value: Boolean); procedure SetName(const Value: TComponentName); override; procedure SetOnFilterRecord(const Value: TFilterRecordEvent); virtual; procedure SetRecNo(Value: Longint); virtual; procedure SetState(Value: TDataSetState); function SetTempState(const Value: TDataSetState): TDataSetState; Function Tempbuffer: TRecordBuffer; procedure UpdateIndexDefs; virtual; property ActiveRecord: Longint read FActiveRecord; property CurrentRecord: Longint read FCurrentRecord; property BlobFieldCount: Longint read FBlobFieldCount; property BookmarkSize: Longint read FBookmarkSize write FBookmarkSize; property Buffers[Index: Longint]: TRecordBuffer read GetBuffer; property BufferCount: Longint read FBufferCount; property CalcBuffer: TRecordBuffer read FCalcBuffer; property CalcFieldsSize: Longint read FCalcFieldsSize; property InternalCalcFields: Boolean read FInternalCalcFields; property Constraints: TCheckConstraints read FConstraints write SetConstraints; function AllocRecordBuffer: TRecordBuffer; virtual; procedure FreeRecordBuffer(var Buffer: TRecordBuffer); virtual; procedure GetBookmarkData(Buffer: TRecordBuffer; Data: Pointer); virtual; function GetBookmarkFlag(Buffer: TRecordBuffer): TBookmarkFlag; virtual; function GetDataSource: TDataSource; virtual; function GetRecordSize: Word; virtual; procedure InternalAddRecord(Buffer: Pointer; AAppend: Boolean); virtual; procedure InternalDelete; virtual; procedure InternalFirst; virtual; procedure InternalGotoBookmark(ABookmark: Pointer); virtual; procedure InternalHandleException; virtual; procedure InternalInitRecord(Buffer: TRecordBuffer); virtual; procedure InternalLast; virtual; procedure InternalPost; virtual; procedure InternalSetToRecord(Buffer: TRecordBuffer); virtual; procedure SetBookmarkFlag(Buffer: TRecordBuffer; Value: TBookmarkFlag); virtual; procedure SetBookmarkData(Buffer: TRecordBuffer; Data: Pointer); virtual; procedure SetUniDirectional(const Value: Boolean); protected { abstract methods } function GetRecord(Buffer: TRecordBuffer; GetMode: TGetMode; DoCheck: Boolean): TGetResult; virtual; abstract; procedure InternalClose; virtual; abstract; procedure InternalOpen; virtual; abstract; procedure InternalInitFieldDefs; virtual; abstract; function IsCursorOpen: Boolean; virtual; abstract; protected { IProviderSupport methods } procedure PSEndTransaction(Commit: Boolean); virtual; procedure PSExecute; virtual; function PSExecuteStatement(const ASQL: string; AParams: TParams; ResultSet: Pointer = nil): Integer; virtual; procedure PSGetAttributes(List: TList); virtual; function PSGetCommandText: string; virtual; function PSGetCommandType: TPSCommandType; virtual; function PSGetDefaultOrder: TIndexDef; virtual; function PSGetIndexDefs(IndexTypes: TIndexOptions = [ixPrimary..ixNonMaintained]) : TIndexDefs; virtual; function PSGetKeyFields: string; virtual; function PSGetParams: TParams; virtual; function PSGetQuoteChar: string; virtual; function PSGetTableName: string; virtual; function PSGetUpdateException(E: Exception; Prev: EUpdateError) : EUpdateError; virtual; function PSInTransaction: Boolean; virtual; function PSIsSQLBased: Boolean; virtual; function PSIsSQLSupported: Boolean; virtual; procedure PSReset; virtual; procedure PSSetCommandText(const CommandText: string); virtual; procedure PSSetParams(AParams: TParams); virtual; procedure PSStartTransaction; virtual; function PSUpdateRecord(UpdateKind: TUpdateKind; Delta: TDataSet) : Boolean; virtual; public constructor Create(AOwner: TComponent); override; destructor Destroy; override; function ActiveBuffer: TRecordBuffer; function GetFieldData(Field: TField; Buffer: Pointer): Boolean; overload; virtual; function GetFieldData(Field: TField; Buffer: Pointer; NativeFormat: Boolean): Boolean; overload; virtual; procedure SetFieldData(Field: TField; Buffer: Pointer); overload; virtual; procedure SetFieldData(Field: TField; Buffer: Pointer; NativeFormat: Boolean); overload; virtual; procedure Append; procedure AppendRecord(const Values: array of const); function BookmarkValid(ABookmark: TBookmark): Boolean; virtual; procedure Cancel; virtual; procedure CheckBrowseMode; procedure ClearFields; procedure Close; function ControlsDisabled: Boolean; function CompareBookmarks(Bookmark1, Bookmark2: TBookmark): Longint; virtual; function CreateBlobStream(Field: TField; Mode: TBlobStreamMode): TStream; virtual; procedure CursorPosChanged; procedure DataConvert(aField: TField; aSource, aDest: Pointer; aToNative: Boolean); virtual; procedure Delete; procedure DisableControls; procedure Edit; procedure EnableControls; function FieldByName(const FieldName: string): TField; function FindField(const FieldName: string): TField; function FindFirst: Boolean; virtual; function FindLast: Boolean; virtual; function FindNext: Boolean; virtual; function FindPrior: Boolean; virtual; procedure First; procedure FreeBookmark(ABookmark: TBookmark); virtual; function GetBookmark: TBookmark; virtual; function GetCurrentRecord(Buffer: TRecordBuffer): Boolean; virtual; procedure GetFieldList(List: TList; const FieldNames: string); procedure GetFieldNames(List: TStrings); procedure GotoBookmark(const ABookmark: TBookmark); procedure Insert; procedure InsertRecord(const Values: array of const); function IsEmpty: Boolean; function IsLinkedTo(ADataSource: TDataSource): Boolean; function IsSequenced: Boolean; virtual; procedure Last; function Locate(const KeyFields: string; const KeyValues: Variant; Options: TLocateOptions) : boolean; virtual; function Lookup(const KeyFields: string; const KeyValues: Variant; const ResultFields: string): Variant; virtual; function MoveBy(Distance: Longint): Longint; procedure Next; procedure Open; procedure Post; virtual; procedure Prior; procedure Refresh; procedure Resync(Mode: TResyncMode); virtual; procedure SetFields(const Values: array of const); function Translate(Src, Dest: PChar; ToOem: Boolean): Integer; virtual; procedure UpdateCursorPos; procedure UpdateRecord; function UpdateStatus: TUpdateStatus; virtual; property BlockReadSize: Integer read FBlockReadSize write SetBlockReadSize; property BOF: Boolean read FBOF; property Bookmark: TBookmarkStr read GetBookmarkStr write SetBookmarkStr; property CanModify: Boolean read GetCanModify; property DataSource: TDataSource read GetDataSource; property DefaultFields: Boolean read FDefaultFields; property EOF: Boolean read FEOF; property FieldCount: Longint read GetFieldCount; property FieldDefs: TFieldDefs read FFieldDefs write SetFieldDefs; // property Fields[Index: Longint]: TField read GetField write SetField; property Found: Boolean read FFound; property Modified: Boolean read FModified; property IsUniDirectional: Boolean read FIsUniDirectional default False; property RecordCount: Longint read GetRecordCount; property RecNo: Longint read GetRecNo write SetRecNo; property RecordSize: Word read GetRecordSize; property State: TDataSetState read FState; property Fields : TFields read FFieldList; property FieldValues[fieldname : string] : Variant read GetFieldValues write SetFieldValues; default; property Filter: string read FFilterText write SetFilterText; property Filtered: Boolean read FFiltered write SetFiltered default False; property FilterOptions: TFilterOptions read FFilterOptions write SetFilterOptions; property Active: Boolean read GetActive write SetActive default False; property AutoCalcFields: Boolean read FAutoCalcFields write FAutoCalcFields default true; property BeforeOpen: TDataSetNotifyEvent read FBeforeOpen write FBeforeOpen; property AfterOpen: TDataSetNotifyEvent read FAfterOpen write FAfterOpen; property BeforeClose: TDataSetNotifyEvent read FBeforeClose write FBeforeClose; property AfterClose: TDataSetNotifyEvent read FAfterClose write FAfterClose; property BeforeInsert: TDataSetNotifyEvent read FBeforeInsert write FBeforeInsert; property AfterInsert: TDataSetNotifyEvent read FAfterInsert write FAfterInsert; property BeforeEdit: TDataSetNotifyEvent read FBeforeEdit write FBeforeEdit; property AfterEdit: TDataSetNotifyEvent read FAfterEdit write FAfterEdit; property BeforePost: TDataSetNotifyEvent read FBeforePost write FBeforePost; property AfterPost: TDataSetNotifyEvent read FAfterPost write FAfterPost; property BeforeCancel: TDataSetNotifyEvent read FBeforeCancel write FBeforeCancel; property AfterCancel: TDataSetNotifyEvent read FAfterCancel write FAfterCancel; property BeforeDelete: TDataSetNotifyEvent read FBeforeDelete write FBeforeDelete; property AfterDelete: TDataSetNotifyEvent read FAfterDelete write FAfterDelete; property BeforeScroll: TDataSetNotifyEvent read FBeforeScroll write FBeforeScroll; property AfterScroll: TDataSetNotifyEvent read FAfterScroll write FAfterScroll; property BeforeRefresh: TDataSetNotifyEvent read FBeforeRefresh write FBeforeRefresh; property AfterRefresh: TDataSetNotifyEvent read FAfterRefresh write FAfterRefresh; property OnCalcFields: TDataSetNotifyEvent read FOnCalcFields write FOnCalcFields; property OnDeleteError: TDataSetErrorEvent read FOnDeleteError write FOnDeleteError; property OnEditError: TDataSetErrorEvent read FOnEditError write FOnEditError; property OnFilterRecord: TFilterRecordEvent read FOnFilterRecord write SetOnFilterRecord; property OnNewRecord: TDataSetNotifyEvent read FOnNewRecord write FOnNewRecord; property OnPostError: TDataSetErrorEvent read FOnPostError write FOnPostError; end; TDataLink = class(TPersistent) private FFirstRecord, FBufferCount : Integer; FActive, FDataSourceFixed, FEditing, FReadOnly, FUpdatingRecord, FVisualControl : Boolean; FDataSource : TDataSource; Function CalcFirstRecord(Index : Integer) : Integer; Procedure CalcRange; Procedure CheckActiveAndEditing; Function GetDataset : TDataset; procedure SetActive(AActive: Boolean); procedure SetDataSource(Value: TDataSource); Procedure SetReadOnly(Value : Boolean); protected procedure ActiveChanged; virtual; procedure CheckBrowseMode; virtual; procedure DataEvent(Event: TDataEvent; Info: Ptrint); virtual; procedure DataSetChanged; virtual; procedure DataSetScrolled(Distance: Integer); virtual; procedure EditingChanged; virtual; procedure FocusControl(Field: TFieldRef); virtual; function GetActiveRecord: Integer; virtual; function GetBOF: Boolean; virtual; function GetBufferCount: Integer; virtual; function GetEOF: Boolean; virtual; function GetRecordCount: Integer; virtual; procedure LayoutChanged; virtual; function MoveBy(Distance: Integer): Integer; virtual; procedure RecordChanged(Field: TField); virtual; procedure SetActiveRecord(Value: Integer); virtual; procedure SetBufferCount(Value: Integer); virtual; procedure UpdateData; virtual; property VisualControl: Boolean read FVisualControl write FVisualControl; property FirstRecord: Integer read FFirstRecord write FFirstRecord; public constructor Create; destructor Destroy; override; function Edit: Boolean; procedure UpdateRecord; function ExecuteAction(Action: TBasicAction): Boolean; virtual; function UpdateAction(Action: TBasicAction): Boolean; virtual; property Active: Boolean read FActive; property ActiveRecord: Integer read GetActiveRecord write SetActiveRecord; property BOF: Boolean read GetBOF; property BufferCount: Integer read GetBufferCount write SetBufferCount; property DataSet: TDataSet read GetDataSet; property DataSource: TDataSource read FDataSource write SetDataSource; property DataSourceFixed: Boolean read FDataSourceFixed write FDataSourceFixed; property Editing: Boolean read FEditing; property Eof: Boolean read GetEOF; property ReadOnly: Boolean read FReadOnly write SetReadOnly; property RecordCount: Integer read GetRecordCount; end; { TDetailDataLink } TDetailDataLink = class(TDataLink) protected function GetDetailDataSet: TDataSet; virtual; public property DetailDataSet: TDataSet read GetDetailDataSet; end; { TMasterDataLink } TMasterDataLink = class(TDetailDataLink) private FDetailDataSet: TDataSet; FFieldNames: string; FFields: TList; FOnMasterChange: TNotifyEvent; FOnMasterDisable: TNotifyEvent; procedure SetFieldNames(const Value: string); protected procedure ActiveChanged; override; procedure CheckBrowseMode; override; function GetDetailDataSet: TDataSet; override; procedure LayoutChanged; override; procedure RecordChanged(Field: TField); override; Procedure DoMasterDisable; virtual; Procedure DoMasterChange; virtual; public constructor Create(ADataSet: TDataSet);virtual; destructor Destroy; override; property FieldNames: string read FFieldNames write SetFieldNames; property Fields: TList read FFields; property OnMasterChange: TNotifyEvent read FOnMasterChange write FOnMasterChange; property OnMasterDisable: TNotifyEvent read FOnMasterDisable write FOnMasterDisable; end; { TMasterParamsDataLink } TMasterParamsDataLink = Class(TMasterDataLink) Private FParams : TParams; Procedure SetParams(AValue : TParams); Protected Procedure DoMasterDisable; override; Procedure DoMasterChange; override; Public constructor Create(ADataSet: TDataSet); override; Procedure RefreshParamNames; virtual; Procedure CopyParamsFromMaster(CopyBound : Boolean); virtual; Property Params : TParams Read FParams Write SetParams; end; { TDataSource } TDataChangeEvent = procedure(Sender: TObject; Field: TField) of object; TDataSource = class(TComponent) private FDataSet: TDataSet; FDataLinks: TList; FEnabled: Boolean; FAutoEdit: Boolean; FState: TDataSetState; FOnStateChange: TNotifyEvent; FOnDataChange: TDataChangeEvent; FOnUpdateData: TNotifyEvent; procedure DistributeEvent(Event: TDataEvent; Info: Ptrint); procedure RegisterDataLink(DataLink: TDataLink); Procedure ProcessEvent(Event : TDataEvent; Info : Ptrint); procedure SetDataSet(ADataSet: TDataSet); procedure SetEnabled(Value: Boolean); procedure UnregisterDataLink(DataLink: TDataLink); protected Procedure DoDataChange (Info : Pointer);virtual; Procedure DoStateChange; virtual; Procedure DoUpdateData; property DataLinks: TList read FDataLinks; public constructor Create(AOwner: TComponent); override; destructor Destroy; override; procedure Edit; function IsLinkedTo(ADataSet: TDataSet): Boolean; property State: TDataSetState read FState; published property AutoEdit: Boolean read FAutoEdit write FAutoEdit default True; property DataSet: TDataSet read FDataSet write SetDataSet; property Enabled: Boolean read FEnabled write SetEnabled default True; property OnStateChange: TNotifyEvent read FOnStateChange write FOnStateChange; property OnDataChange: TDataChangeEvent read FOnDataChange write FOnDataChange; property OnUpdateData: TNotifyEvent read FOnUpdateData write FOnUpdateData; end; { TDBDataset } TDBDatasetClass = Class of TDBDataset; TDBDataset = Class(TDataset) Private FDatabase : TDatabase; FTransaction : TDBTransaction; Protected Procedure SetDatabase (Value : TDatabase); virtual; Procedure SetTransaction(Value : TDBTransaction); virtual; Procedure CheckDatabase; Public Destructor destroy; override; Property DataBase : TDatabase Read FDatabase Write SetDatabase; Property Transaction : TDBTransaction Read FTransaction Write SetTransaction; end; { TDBTransaction } TDBTransactionClass = Class of TDBTransaction; TDBTransaction = Class(TComponent) Private FActive : boolean; FDatabase : TDatabase; FDataSets : TList; FOpenAfterRead : boolean; Function GetDataSetCount : Longint; Function GetDataset(Index : longint) : TDBDataset; procedure RegisterDataset (DS : TDBDataset); procedure UnRegisterDataset (DS : TDBDataset); procedure RemoveDataSets; procedure SetActive(Value : boolean); Protected Procedure SetDatabase (Value : TDatabase); virtual; procedure CloseTrans; procedure openTrans; Procedure CheckDatabase; Procedure CheckActive; Procedure CheckInactive; procedure EndTransaction; virtual; abstract; procedure StartTransaction; virtual; abstract; procedure InternalHandleException; virtual; procedure Loaded; override; Public constructor Create(AOwner: TComponent); override; Destructor destroy; override; procedure CloseDataSets; Property DataBase : TDatabase Read FDatabase Write SetDatabase; published property Active : boolean read FActive write setactive; end; { TCustomConnection } TLoginEvent = procedure(Sender: TObject; Username, Password: string) of object; TCustomConnection = class(TComponent) private FAfterConnect: TNotifyEvent; FAfterDisconnect: TNotifyEvent; FBeforeConnect: TNotifyEvent; FBeforeDisconnect: TNotifyEvent; FForcedClose: Boolean; FLoginPrompt: Boolean; FOnLogin: TLoginEvent; FStreamedConnected: Boolean; procedure SetAfterConnect(const AValue: TNotifyEvent); procedure SetAfterDisconnect(const AValue: TNotifyEvent); procedure SetBeforeConnect(const AValue: TNotifyEvent); procedure SetBeforeDisconnect(const AValue: TNotifyEvent); protected procedure DoConnect; virtual; procedure DoDisconnect; virtual; function GetConnected : boolean; virtual; Function GetDataset(Index : longint) : TDataset; virtual; Function GetDataSetCount : Longint; virtual; procedure InternalHandleException; virtual; procedure Loaded; override; procedure SetConnected (Value : boolean); virtual; property ForcedClose : Boolean read FForcedClose write FForcedClose; property Streamedconnected: Boolean read FStreamedConnected write FStreamedConnected; public procedure Close(ForceClose: Boolean=False); destructor Destroy; override; procedure Open; property DataSetCount: Longint read GetDataSetCount; property DataSets[Index: Longint]: TDataSet read GetDataSet; published property Connected: Boolean read GetConnected write SetConnected; property LoginPrompt: Boolean read FLoginPrompt write FLoginPrompt; property AfterConnect : TNotifyEvent read FAfterConnect write SetAfterConnect; property AfterDisconnect : TNotifyEvent read FAfterDisconnect write SetAfterDisconnect; property BeforeConnect : TNotifyEvent read FBeforeConnect write SetBeforeConnect; property BeforeDisconnect : TNotifyEvent read FBeforeDisconnect write SetBeforeDisconnect; property OnLogin: TLoginEvent read FOnLogin write FOnLogin; end; { TDatabase } TDatabaseClass = Class Of TDatabase; TDatabase = class(TCustomConnection) private FConnected : Boolean; FDataBaseName : String; FDataSets : TList; FTransactions : TList; FDirectory : String; FKeepConnection : Boolean; FParams : TStrings; FSQLBased : Boolean; FOpenAfterRead : boolean; Function GetTransactionCount : Longint; Function GetTransaction(Index : longint) : TDBTransaction; procedure RegisterDataset (DS : TDBDataset); procedure RegisterTransaction (TA : TDBTransaction); procedure UnRegisterDataset (DS : TDBDataset); procedure UnRegisterTransaction(TA : TDBTransaction); procedure RemoveDataSets; procedure RemoveTransactions; procedure SetParams(AValue: TStrings); protected Procedure CheckConnected; Procedure CheckDisConnected; procedure DoConnect; override; procedure DoDisconnect; override; function GetConnected : boolean; override; Function GetDataset(Index : longint) : TDataset; override; Function GetDataSetCount : Longint; override; Procedure DoInternalConnect; Virtual;Abstract; Procedure DoInternalDisConnect; Virtual;Abstract; public constructor Create(AOwner: TComponent); override; destructor Destroy; override; procedure CloseDataSets; procedure CloseTransactions; // procedure ApplyUpdates; procedure StartTransaction; virtual; abstract; procedure EndTransaction; virtual; abstract; property TransactionCount: Longint read GetTransactionCount; property Transactions[Index: Longint]: TDBTransaction read GetTransaction; property Directory: string read FDirectory write FDirectory; property IsSQLBased: Boolean read FSQLBased; published property Connected: Boolean read FConnected write SetConnected; property DatabaseName: string read FDatabaseName write FDatabaseName; property KeepConnection: Boolean read FKeepConnection write FKeepConnection; property Params : TStrings read FParams Write SetParams; end; const FieldTypetoVariantMap : array[TFieldType] of Integer = (varError, varOleStr, varSmallint, varInteger, varSmallint, varBoolean, varDouble, varCurrency, varCurrency, varDate, varDate, varDate, varOleStr, varOleStr, varInteger, varOleStr, varOleStr, varOleStr, varOleStr, varOleStr, varOleStr, varOleStr, varError, varOleStr, varOleStr, varError, varError, varError, varError, varError, varOleStr, varOleStr, varVariant, varUnknown, varDispatch, varOleStr, varOleStr, varDouble, varOleStr,varOleStr); Const Fieldtypenames : Array [TFieldType] of String[15] = ( 'Unknown', 'String', 'Smallint', 'Integer', 'Word', 'Boolean', 'Float', 'Currency', 'BCD', 'Date', 'Time', 'DateTime', 'Bytes', 'VarBytes', 'AutoInc', 'Blob', 'Memo', 'Graphic', 'FmtMemo', 'ParadoxOle', 'DBaseOle', 'TypedBinary', 'Cursor', 'FixedChar', 'WideString', 'Largeint', 'ADT', 'Array', 'Reference', 'DataSet', 'OraBlob', 'OraClob', 'Variant', 'Interface', 'IDispatch', 'Guid', 'TimeStamp', 'FMTBcd', 'FixedWideChar', 'WideMemo' ); { 'Unknown', 'String', 'Smallint', 'Integer', 'Word', 'Boolean', 'Float', 'Date', 'Time', 'DateTime', 'Bytes', 'VarBytes', 'AutoInc', 'Blob', 'Memo', 'Graphic', 'FmtMemo', 'ParadoxOle', 'DBaseOle', 'TypedBinary', 'Cursor' );} const DefaultFieldClasses : Array [TFieldType] of TFieldClass = ( { ftUnknown} Tfield, { ftString} TStringField, { ftSmallint} TSmallIntField, { ftInteger} TLongintField, { ftWord} TWordField, { ftBoolean} TBooleanField, { ftFloat} TFloatField, { ftCurrency} TCurrencyField, { ftBCD} TBCDField, { ftDate} TDateField, { ftTime} TTimeField, { ftDateTime} TDateTimeField, { ftBytes} TBytesField, { ftVarBytes} TVarBytesField, { ftAutoInc} TAutoIncField, { ftBlob} TBlobField, { ftMemo} TMemoField, { ftGraphic} TGraphicField, { ftFmtMemo} TBlobField, { ftParadoxOle} TBlobField, { ftDBaseOle} TBlobField, { ftTypedBinary} TBlobField, { ftCursor} Nil, { ftFixedChar} TStringField, { ftWideString} TWideStringField, { ftLargeint} TLargeIntField, { ftADT} Nil, { ftArray} Nil, { ftReference} Nil, { ftDataSet} Nil, { ftOraBlob} TBlobField, { ftOraClob} TMemoField, { ftVariant} TVariantField, { ftInterface} Nil, { ftIDispatch} Nil, { ftGuid} TGuidField, { ftTimeStamp} Nil, { ftFMTBcd} TFMTBCDField, { ftFixedWideString} TWideStringField, { ftWideMemo} TWideMemoField ); dsEditModes = [dsEdit, dsInsert, dsSetKey]; dsWriteModes = [dsEdit, dsInsert, dsSetKey, dsCalcFields, dsFilter, dsNewValue, dsInternalCalc]; { Auxiliary functions } Procedure DatabaseError (Const Msg : String); overload; Procedure DatabaseError (Const Msg : String; Comp : TComponent); overload; Procedure DatabaseErrorFmt (Const Fmt : String; Args : Array Of Const); overload; Procedure DatabaseErrorFmt (Const Fmt : String; Args : Array Of const; Comp : TComponent); overload; Function ExtractFieldName(Const Fields: String; var Pos: Integer): String; Function DateTimeRecToDateTime(DT: TFieldType; Data: TDateTimeRec): TDateTime; Function DateTimeToDateTimeRec(DT: TFieldType; Data: TDateTime): TDateTimeRec; procedure DisposeMem(var Buffer; Size: Integer); function BuffersEqual(Buf1, Buf2: Pointer; Size: Integer): Boolean; function SkipComments(var p: PChar; EscapeSlash, EscapeRepeat : Boolean) : boolean; implementation uses dbconst,typinfo; { --------------------------------------------------------------------- Auxiliary functions ---------------------------------------------------------------------} Procedure DatabaseError (Const Msg : String); begin Raise EDataBaseError.Create(Msg); end; Procedure DatabaseError (Const Msg : String; Comp : TComponent); begin if assigned(Comp) and (Comp.Name <> '') then Raise EDatabaseError.CreateFmt('%s : %s',[Comp.Name,Msg]) else DatabaseError(Msg); end; Procedure DatabaseErrorFmt (Const Fmt : String; Args : Array Of Const); begin Raise EDatabaseError.CreateFmt(Fmt,Args); end; Procedure DatabaseErrorFmt (Const Fmt : String; Args : Array Of const; Comp : TComponent); begin if assigned(comp) then Raise EDatabaseError.CreateFmt(Format('%s : %s',[Comp.Name,Fmt]),Args) else DatabaseErrorFmt(Fmt, Args); end; function ExtractFieldName(const Fields: string; var Pos: Integer): string; var i: Integer; FieldsLength: Integer; begin i:=Pos; FieldsLength:=Length(Fields); while (i<=FieldsLength) and (Fields[i]<>';') do Inc(i); Result:=Trim(Copy(Fields,Pos,i-Pos)); if (i<=FieldsLength) and (Fields[i]=';') then Inc(i); Pos:=i; end; { EUpdateError } constructor EUpdateError.Create(NativeError, Context : String; ErrCode, PrevError : integer; E: Exception); begin Inherited CreateFmt(NativeError,[Context]); FContext := Context; FErrorCode := ErrCode; FPreviousError := PrevError; FOriginalException := E; end; Destructor EUpdateError.Destroy; begin FOriginalException.Free; Inherited; end; { TNamedItem } function TNamedItem.GetDisplayName: string; begin Result := FName; end; procedure TNamedItem.SetDisplayName(const AValue: string); Var TmpInd : Integer; begin if FName=AValue then exit; if (AValue <> '') and (Collection is TFieldDefs) then begin TmpInd := (TDefCollection(Collection).IndexOf(AValue)); if (TmpInd >= 0) and (TmpInd <> Index) then DatabaseErrorFmt(SDuplicateName, [AValue, Collection.ClassName]); end; FName:=AValue; inherited SetDisplayName(AValue); end; { TDefCollection } procedure TDefCollection.SetItemName(AItem: TCollectionItem); begin with AItem as TNamedItem do if Name = '' then begin if assigned(Dataset) then Name := Dataset.Name + Copy(ClassName, 2, 5) + IntToStr(ID+1) else Name := Copy(ClassName, 2, 5) + IntToStr(ID+1); end else inherited SetItemName(AItem); end; constructor TDefCollection.create(ADataset: TDataset; AOwner: TPersistent; AClass: TCollectionItemClass); begin inherited Create(AOwner,AClass); FDataset := ADataset; end; function TDefCollection.Find(const AName: string): TNamedItem; var i: integer; begin Result := Nil; for i := 0 to Count - 1 do if AnsiSameText(TNamedItem(Items[i]).Name, AName) then begin Result := TNamedItem(Items[i]); Break; end; end; procedure TDefCollection.GetItemNames(List: TStrings); var i: LongInt; begin for i := 0 to Count - 1 do List.Add(TNamedItem(Items[i]).Name); end; function TDefCollection.IndexOf(const AName: string): Longint; var i: LongInt; begin Result := -1; for i := 0 to Count - 1 do if AnsiSameText(TNamedItem(Items[i]).Name, AName) then begin Result := i; Break; end; end; { TIndexDef } procedure TIndexDef.SetDescFields(const AValue: string); begin if FDescFields=AValue then exit; if AValue <> '' then FOptions:=FOptions + [ixDescending]; FDescFields:=AValue; end; procedure TIndexDef.Assign(Source: TPersistent); var idef : TIndexDef; begin idef := nil; if Source is TIndexDef then idef := Source as TIndexDef; if Assigned(idef) then begin FName := idef.Name; FFields := idef.Fields; FOptions := idef.Options; FCaseinsFields := idef.CaseInsFields; FDescFields := idef.DescFields; FSource := idef.Source; FExpression := idef.Expression; end else inherited Assign(Source); end; function TIndexDef.GetExpression: string; begin Result := FExpression; end; procedure TIndexDef.SetExpression(const AValue: string); begin FExpression := AValue; end; procedure TIndexDef.SetCaseInsFields(const AValue: string); begin if FCaseinsFields=AValue then exit; if AValue <> '' then FOptions:=FOptions + [ixCaseInsensitive]; FCaseinsFields:=AValue; end; constructor TIndexDef.Create(Owner: TIndexDefs; const AName, TheFields: string; TheOptions: TIndexOptions); begin FName := aname; inherited create(Owner); FFields := TheFields; FOptions := TheOptions; end; { TIndexDefs } Function TIndexDefs.GetItem (Index : integer) : TIndexDef; begin Result:=(Inherited GetItem(Index)) as TIndexDef; end; Procedure TIndexDefs.SetItem(Index: Integer; Value: TIndexDef); begin Inherited SetItem(Index,Value); end; constructor TIndexDefs.Create(ADataSet: TDataSet); begin inherited create(ADataset, Owner, TIndexDef); end; Function TIndexDefs.AddIndexDef: TIndexDef; begin // Result := inherited add as TIndexDef; Result:=TIndexDef.Create(Self,'','',[]); end; procedure TIndexDefs.Add(const Name, Fields: string; Options: TIndexOptions); begin TIndexDef.Create(Self,Name,Fields,Options); end; function TIndexDefs.Find(const IndexName: string): TIndexDef; begin Result := (inherited Find(IndexName)) as TIndexDef; if (Result=Nil) Then DatabaseErrorFmt(SIndexNotFound, [IndexName], FDataSet); end; function TIndexDefs.FindIndexForFields(const Fields: string): TIndexDef; begin //!! To be implemented end; function TIndexDefs.GetIndexForFields(const Fields: string; CaseInsensitive: Boolean): TIndexDef; var i, FieldsLen: integer; Last: TIndexDef; begin Last := nil; FieldsLen := Length(Fields); for i := 0 to Count - 1 do begin Result := Items[I]; if (Result.Options * [ixDescending, ixExpression] = []) and (not CaseInsensitive or (ixCaseInsensitive in Result.Options)) and AnsiSameText(Fields, Result.Fields) then begin Exit; end else if AnsiSameText(Fields, Copy(Result.Fields, 1, FieldsLen)) and ((Length(Result.Fields) = FieldsLen) or (Result.Fields[FieldsLen + 1] = ';')) then begin if (Last = nil) or ((Last <> nil) And (Length(Last.Fields) > Length(Result.Fields))) then Last := Result; end; end; Result := Last; end; procedure TIndexDefs.Update; begin if (not updated) and assigned(Dataset) then begin Dataset.UpdateIndexDefs; updated := True; end; end; { TCheckConstraint } procedure TCheckConstraint.Assign(Source: TPersistent); begin //!! To be implemented end; { TCheckConstraints } Function TCheckConstraints.GetItem(Index : Longint) : TCheckConstraint; begin //!! To be implemented Result := nil; end; Procedure TCheckConstraints.SetItem(index : Longint; Value : TCheckConstraint); begin //!! To be implemented end; function TCheckConstraints.GetOwner: TPersistent; begin //!! To be implemented Result := nil; end; constructor TCheckConstraints.Create(AOwner: TPersistent); begin //!! To be implemented inherited Create(TCheckConstraint); end; function TCheckConstraints.Add: TCheckConstraint; begin //!! To be implemented Result := nil; end; { TLookupList } constructor TLookupList.Create; begin FList := TFPList.Create; end; destructor TLookupList.Destroy; begin Clear; FList.Destroy; inherited Destroy; end; procedure TLookupList.Add(const AKey, AValue: Variant); var LookupRec: PLookupListRec; begin New(LookupRec); LookupRec^.Key := AKey; LookupRec^.Value := AValue; FList.Add(LookupRec); end; procedure TLookupList.Clear; var i: integer; begin for i := 0 to FList.Count - 1 do Dispose(PLookupListRec(FList[i])); FList.Clear; end; function TLookupList.FirstKeyByValue(const AValue: Variant): Variant; var i: Integer; begin for i := 0 to FList.Count - 1 do with PLookupListRec(FList[i])^ do if Value = AValue then begin Result := Key; exit; end; Result := Null; end; function TLookupList.ValueOfKey(const AKey: Variant): Variant; Function VarArraySameValues(VarArray1,VarArray2 : Variant) : Boolean; // This only works for one-dimensional vararrays with a lower bound of 0 // and equal higher bounds wich only contains variants. // The vararrays returned by GetFieldValues do apply. var i : integer; begin Result := True; if (VarArrayHighBound(VarArray1,1))<> (VarArrayHighBound(VarArray2,1)) then exit; for i := 0 to VarArrayHighBound(VarArray1,1) do begin if VarArray1[i]<>VarArray2[i] then begin Result := false; Exit; end; end; end; var I: Integer; begin Result := Null; if VarIsNull(AKey) then Exit; i := FList.Count - 1; if VarIsArray(AKey) then while (i >= 0) And not VarArraySameValues(PLookupListRec(FList.Items[I])^.Key,AKey) do Dec(i) else while (i >= 0) And (PLookupListRec(FList.Items[I])^.Key <> AKey) do Dec(i); if i >= 0 then Result := PLookupListRec(FList.Items[I])^.Value; end; procedure TLookupList.ValuesToStrings(AStrings: TStrings); var i: Integer; p: PLookupListRec; begin AStrings.Clear; for i := 0 to FList.Count - 1 do begin p := PLookupListRec(FList[i]); AStrings.AddObject(p^.Value, TObject(p)); end; end; procedure DisposeMem(var Buffer; Size: Integer); begin if Pointer(Buffer) <> nil then begin FreeMem(Pointer(Buffer), Size); Pointer(Buffer) := nil; end; end; function BuffersEqual(Buf1, Buf2: Pointer; Size: Integer): Boolean; begin Result:=CompareByte(Buf1,Buf2,Size)=0 end; {$i dataset.inc} {$i fields.inc} {$i datasource.inc} {$i database.inc} {$i dsparams.inc} end.