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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
DBF Data Dictionary Engine 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 fpddDbf;
{$mode objfpc}{$H+}
interface
uses
Classes, SysUtils, db,dbf, fpdatadict;
Type
{ TDBFDDimporter }
{ TDBFDDEngine }
TDBFDDEngine = Class(TFPDDEngine)
Private
FDBF : TDBF;
Public
Procedure Disconnect ; override;
Function Connect(const AConnectString : String) : Boolean; override;
Function GetTableList(List : TStrings) : Integer; override;
Function ImportFields(Table : TDDTableDef) : Integer; override;
Function ViewTable(Const TableName: String; DatasetOwner : TComponent) : TDataset; override;
Function GetTableIndexDefs(ATableName : String; Defs : TDDIndexDefs) : integer ; override;
Class function Description : string; override;
Class function DBType : String; override;
Class function EngineCapabilities : TFPDDEngineCapabilities; override;
end;
Procedure InitDBFImporter;
Procedure DoneDBFImporter;
implementation
uses dbf_idxfile;
procedure TDBFDDEngine.Disconnect;
begin
FConnectString:='';
FConnected:=False;
FreeAndNil(FDBF);
end;
function TDBFDDEngine.Connect(const AConnectString : String): Boolean;
begin
FDBF:=TDBF.Create(Self);
FDBF.FilePath:=AConnectString;
FConnected:=True;
FConnectString:=AConnectString;
Result:=True;
end;
Function TDBFDDEngine.GetTableList(List: TStrings) : Integer;
Var
Info : TSearchrec;
FN : String;
begin
Result:=0;
If Assigned(FDBF) then
begin
FN:=IncludeTrailingPathDelimiter(FDBF.FilePath);
If FindFirst(FN+'*.dbf',0,Info)=0 then
try
Repeat
inc(Result);
If Assigned(List) then
List.Add(info.name);
Until (FindNext(Info)<>0);
finally
FindClose(Info);
end;
end;
end;
Function TDBFDDEngine.ImportFields(Table: TDDTableDef) : Integer;
begin
Result:=0;
if Assigned(FDBF) then
begin
FDBF.TableName:=Table.TableName;
FDBF.Open;
Try
Table.ImportFromDataset(FDBF);
Finally
FDBF.Close;
end;
end;
end;
function TDBFDDEngine.ViewTable(const TableName: String;
DatasetOwner: TComponent): TDataset;
Var
D : TDBF;
begin
If DatasetOwner=Nil then
DatasetOwner:=Self;
D:=TDBF.Create(DatasetOwner);
D.FilePath:=FDBF.FilePath;
D.TableName:=TableName;
Result:=D;
end;
function TDBFDDEngine.GetTableIndexDefs(ATableName: String; Defs: TDDIndexDefs
): integer;
Var
D : TDBF;
DBD : TDBFIndexDef;
DD : TDDIndexDef;
I : Integer;
begin
D:=TDBF.Create(Self);
Try
D.FilePath:=FDBF.FilePath;
D.TableName:=ATableName;
D.IndexDefs.Update;
Defs.Clear;
For I:=0 to D.IndexDefs.Count-1 do
begin
DBD:=D.IndexDefs[i];
DD:=Defs.AddDDIndexDef(DBD.Name);
DD.Fields:=DBD.SortField;
DD.Options:=DBD.Options;
end;
Result:=Defs.Count;
Finally
D.Free;
end;
end;
Class function TDBFDDEngine.Description: string;
begin
Result:='DBase database dictionary importer';
end;
class function TDBFDDEngine.DBType: String;
begin
Result:='DBase files';
end;
class function TDBFDDEngine.EngineCapabilities: TFPDDEngineCapabilities;
begin
Result:=[ecImport,ecViewTable];
end;
Procedure InitDBFImporter;
begin
RegisterDictionaryEngine(TDBFDDEngine);
end;
Procedure DoneDBFImporter;
begin
UnRegisterDictionaryEngine(TDBFDDEngine);
end;
Initialization
InitDBFImporter;
Finalization
DoneDBFImporter;
end.
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