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{
This file is part of the Free Pascal run time library.
Copyright (c) 2007 by Michael Van Canneyt, member of the
Free Pascal development team
SQLDB Data Dictionary Engine common Implementation.
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 fpddsqldb;
{$mode objfpc}{$H+}
interface
uses
Classes, SysUtils, DB, sqldb, fpdatadict;
Type
{ TSQLDBDDEngine }
TSQLDBDDEngine = Class(TFPDDEngine)
Private
FConn: TSQLConnection;
Protected
Function CreateConnection(AConnectString : String) : TSQLConnection; virtual; abstract;
Function CreateSQLQuery(ADatasetOwner: TComponent) : TSQLQuery;
Property Connection : TSQLConnection Read FConn;
Public
Procedure Disconnect ; override;
Function HostSupported: Boolean; virtual;
Function Connect(const AConnectString : String) : Boolean; override;
Function GetTableList(List : TStrings) : Integer; override;
Function ImportFields(Table : TDDTableDef) : Integer; override;
Function ImportIndexes(Table : TDDTableDef) : Integer; override;
Function ViewTable(Const TableName: String; DatasetOwner : TComponent) : TDataset; override;
Function RunQuery(SQL : String) : Integer; override;
Function CreateQuery(SQL : String; DatasetOwner : TComponent) : TDataset; override;
Procedure SetQueryStatement(SQL : String; AQuery : TDataset); override;
Function GetTableIndexDefs(ATableName : String; Defs : TDDIndexDefs) : integer ; override;
Class function EngineCapabilities : TFPDDEngineCapabilities; override;
end;
Const
// used in connectionstring
KeyHostName = 'Host';
KeyDatabaseName = 'Database';
KeyUserName = 'User';
KeyPassword = 'Password';
KeyEncode = 'Trivial';
KeyCharset = 'Charset';
implementation
uses strutils;
Resourcestring
SErrQueryNotSQLQuery = 'Query object "%s" is not a SQL Query';
{ TSQLDBDDEngine }
function TSQLDBDDEngine.HostSupported: Boolean;
begin
Result:=True;
end;
function TSQLDBDDEngine.CreateSQLQuery(ADatasetOwner: TComponent): TSQLQuery;
begin
Result:=TSQLQuery.Create(ADatasetOwner);
Result.DataBase:=FConn;
Result.Transaction:=FConn.TRansaction;
end;
procedure TSQLDBDDEngine.Disconnect;
begin
FreeAndNil(FConn);
FConnectString:='';
FConnected:=False;
end;
function TSQLDBDDEngine.Connect(const AConnectString: String): Boolean;
Var
L : TStringList;
begin
FConn:=CreateConnection(AConnectString);
FConn.Transaction:=TSQLTransaction.Create(FConn);
L:=TStringList.Create;
Try
L.CommaText:=AConnectString;
If HostSupported then
FConn.HostName:=L.Values[KeyHostName];
FConn.DatabaseName:=L.Values[KeyDatabaseName];
FConn.UserName:=L.Values[KeyUserName];
FConn.Password:=XorDecode(KeyEncode,L.Values[KeyPassword]);
FConn.LoginPrompt:=False;
FConn.Connected:=True;
FConn.CharSet:=L.Values[KeyCharset];
FConnected:=True;
FConnectString:=AConnectString;
Result:=True;
Finally
L.Free;
end;
end;
function TSQLDBDDEngine.GetTableList(List: TStrings): Integer;
begin
FConn.GetTableNames(List,False);
result := list.count;
end;
function TSQLDBDDEngine.ImportFields(Table: TDDTableDef): Integer;
Const
SQL = 'SELECT * from %s where (1=0)';
Var
Q : TSQLQuery;
begin
Q:=CreateSQLQuery(Nil);
try
Q.Sql.Text:=Format(SQL,[Table.TableName]);
Q.Open;
try
Result:=Table.ImportFromDataset(Q);
finally
Q.CLose;
end;
finally
Q.Free;
end;
end;
Function TSQLDBDDEngine.ImportIndexes(Table : TDDTableDef) : Integer;
begin
end;
function TSQLDBDDEngine.ViewTable(const TableName: String;
DatasetOwner: TComponent): TDataset;
Var
Q : TSQLQuery;
begin
Q:=CreateSQLQuery(DatasetOwner);
Q.SQL.Text:='SELECT * FROM '+TableName;
Result:=Q;
end;
function TSQLDBDDEngine.RunQuery(SQL: String): Integer;
Var
Q : TSQLQuery;
begin
Q:=CreateSQLQuery(Nil);
Try
Q.SQL.Text:=SQL;
Q.ExecSQL;
Result:=0;
Finally
Q.Free;
end;
end;
function TSQLDBDDEngine.CreateQuery(SQL: String; DatasetOwner: TComponent
): TDataset;
Var
Q : TSQLQuery;
begin
Q:=CreateSQLQuery(Nil);
Result:=Q;
Q.SQL.Text:=SQL;
Q.Open;
end;
procedure TSQLDBDDEngine.SetQueryStatement(SQL: String; AQuery: TDataset);
begin
If Not (AQuery is TSQLQuery) then
Raise EDataDict.CreateFmt(SErrQueryNotSQLQuery,[AQuery.ClassName]);
(AQuery as TSQLQuery).SQL.Text:=SQL;
end;
function TSQLDBDDEngine.GetTableIndexDefs(ATableName: String; Defs: TDDIndexDefs
): integer;
Var
Q : TSQLQuery;
begin
Q:=TSQLQuery.Create(Self);
Try
Q.Database:=FConn;
Q.Transaction:=FConn.Transaction;
Q.SQL.text:=Format('SELECT * FROM %s WHERE (1=2)',[ATAbleName]);
Q.ReadOnly:=False;
Q.Prepare;
Q.IndexDefs.Update;
IndexDefsToDDIndexDefs(Q.IndexDefs,Defs);
Result:=Defs.Count;
finally
Q.Free;
end;
end;
class function TSQLDBDDEngine.EngineCapabilities: TFPDDEngineCapabilities;
begin
Result:=[ecimport,ecViewTable, ecRunQuery, ecTableIndexes];
end;
end.
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