bdedatadrivereh.pas

Ehlib.v3.4.for.Delphi5678.rar是DELPHI的三方控件源码.此控件适用于DELPHI5,6,7,8.

{*******************************************************}
{                                                       }
{                     EhLib vX.X                        }
{                                                       }
{          TBDEDataDriverEh component (Build 11)        }
{                                                       }
{      Copyright (c) 2003,04 by Dmitry V. Bolshakov     }
{                                                       }
{*******************************************************}

unit BDEDataDriverEh {$IFDEF CIL} platform{$ENDIF};

{$I EHLIB.INC}

interface

uses Windows, SysUtils, Classes, Controls, DB,
{$IFDEF EH_LIB_6} Variants, {$ENDIF}
{$IFDEF EH_LIB_5} Contnrs, {$ENDIF}
  ToolCtrlsEh, DBCommon, MemTableDataEh, DataDriverEh, DBTables;
type

  TBDEDataDriverEh = class;

{ TBDECommandEh }

  TBDECommandEh = class(TBaseSQLCommandEh)
  private
    function GetDataDriver: TBDEDataDriverEh;
  public
    function Execute(var Cursor: TDataSet; var FreeOnEof: Boolean): Integer; override;
    property DataDriver: TBDEDataDriverEh read GetDataDriver;
  published
    property Params;
    property ParamCheck;
    property CommandText;
    property CommandType;
  end;

{ TBDEDataDriverEh }

  TBDEDataDriverEh = class(TBaseSQLDataDriverEh)
  private
    FDatabaseName: string;
    FSpecParams: TStrings;
    FSessionName: string;
    function GetDBSession: TSession;
    procedure SetDatabaseName(const Value: string);
    procedure SetSessionName(const Value: string);
    procedure SetSpecParams(const Value: TStrings);
  protected
    function CreateSelectCommand: TCustomSQLCommandEh; override;
    function CreateUpdateCommand: TCustomSQLCommandEh; override;
    function CreateInsertCommand: TCustomSQLCommandEh; override;
    function CreateDeleteCommand: TCustomSQLCommandEh; override;
    function CreateGetrecCommand: TCustomSQLCommandEh; override;
    procedure SetAutoIncFields(Fields: TFields; DataStruct: TMTDataStructEh); override;
  public
    constructor Create(AOwner: TComponent); override;
    destructor Destroy; override;
    function CreateDesignCopy: TCustomSQLDataDriverEh; override;
    function CreateDesignDataBase: IInterface; override;
    procedure GetBackUpdatedValues(MemRec: TMemoryRecordEh; Command: TCustomSQLCommandEh; ResDataSet: TDataSet); override;
    procedure DoServerSpecOperations(MemRec: TMemoryRecordEh; Command: TCustomSQLCommandEh; ResDataSet: TDataSet); virtual;
    property DBSession: TSession read GetDBSession;
    property SessionName: string read FSessionName write SetSessionName;
  published
    property DatabaseName: string read FDatabaseName write SetDatabaseName;
    property SelectCommand;
    property SelectSQL;
    property UpdateCommand;
    property UpdateSQL;
    property InsertCommand;
    property InsertSQL;
    property DeleteCommand;
    property DeleteSQL;
    property GetrecCommand;
    property GetrecSQL;
    property ProviderDataSet;
    property KeyFields;
    property SpecParams: TStrings read FSpecParams write SetSpecParams;

    property OnExecuteCommand;
    property OnBuildDataStruct;
    property OnGetBackUpdatedValues;
    property OnProduceDataReader;
    property OnAssignFieldValue;
    property OnReadRecord;
    property OnRefreshRecord;
    property OnUpdateRecord;
    property OnAssignCommandParam;
    property OnUpdateError;
  end;

implementation

uses
{$IFDEF CIL}
  System.Text,
{$ENDIF}
  BDE;

{ TBDECommandEh }

function TBDECommandEh.Execute(var Cursor: TDataSet; var FreeOnEof: Boolean): Integer;
var
  ACursor: TDataSet;
begin
  Result := -1;
  Cursor := nil;
  FreeOnEof := False;
  ACursor := nil;
  try
    case CommandType of
      cthSelectQuery, cthUpdateQuery:
        begin
          ACursor := TQuery.Create(nil);
          with ACursor as TQuery do
          begin
            DataBaseName := DataDriver.DatabaseName;
            SQL := Self.CommandText;
            Params := Self.Params;
            if CommandType = cthSelectQuery then
              Open
            else
            begin
              ExecSQL;
              Result := RowsAffected;
            end;
            Self.Params := Params;
          end;
        end;
      cthTable:
        begin
          ACursor := TTable.Create(nil);
          with ACursor as TTable do
          begin
            DataBaseName := DataDriver.DatabaseName;
            TableName := Self.CommandText.Text;
            Params := Self.Params;
            Open;
            Self.Params := Params;
          end;
        end;
      cthStoredProc:
        begin
          ACursor := TStoredProc.Create(nil);
          with ACursor as TStoredProc do
          begin
            DataBaseName := DataDriver.DatabaseName;
            StoredProcName := Self.CommandText.Text;
            Params := Self.Params;
            ExecProc;
//??            Result := RowsAffected;
            Self.Params := Params;
          end;
        end;
    end;
    if ACursor.Active then
    begin
      Cursor := ACursor;
      FreeOnEof := True;
      ACursor := nil;
    end
  finally
    if ACursor <> nil then
      ACursor.Free;
  end;
end;

function TBDECommandEh.GetDataDriver: TBDEDataDriverEh;
begin
  Result := TBDEDataDriverEh(inherited DataDriver);
end;

{ TBDEDataDriverEh }

var
  DataBaseInc: Integer = 0;

function GetUnicalDataBaseName: String;
begin
  Inc(DataBaseInc);
  Result := 'BDEDataDriverEhDataBaseName' + IntToStr(DataBaseInc);
end;

constructor TBDEDataDriverEh.Create(AOwner: TComponent);
begin
  inherited Create(AOwner);
  FSpecParams := TStringList.Create;
end;

destructor TBDEDataDriverEh.Destroy;
begin
  FSpecParams.Free;
  inherited Destroy;
end;

function TBDEDataDriverEh.CreateDesignCopy: TCustomSQLDataDriverEh;
begin
  Result := TBDEDataDriverEh.Create(nil);
  Result.SelectCommand := SelectCommand;
  Result.UpdateCommand := UpdateCommand;
  Result.InsertCommand := InsertCommand;
  Result.DeleteCommand := DeleteCommand;
  Result.GetrecCommand := GetrecCommand;
//  TBDEDataDriverEh(Result).DatabaseName :=
//   (DesignDataBase as IBDEDesignDataBaseEh).GetDataBase.DatabaseName;
end;

type
  TDBDescription = record
    szName          : String;          { Logical name (Or alias) }
    szText          : String;          { Descriptive text }
    szPhyName       : String;          { Physical name/path }
    szDbType        : String;          { Database type }
  end;

{$IFDEF CIL}
function StrToOem(const AnsiStr: string): string;
var
  Len: Cardinal;
  Buffer: StringBuilder;
begin
  Len := Length(AnsiStr);
  if Len > 0 then
  begin
    Buffer := StringBuilder.Create(Len);
    CharToOemA(AnsiStr, Buffer);
    Result := Buffer.ToString;
  end;
end;
{$ELSE}
function StrToOem(const AnsiStr: string): string;
begin
  SetLength(Result, Length(AnsiStr));
  if Length(Result) > 0 then
    CharToOem(PChar(AnsiStr), PChar(Result));
end;
{$ENDIF}

function GetDatabaseDesc(DBName: String; var Description: TDBDescription): Boolean;
var
  Desc: DBDesc;
begin
  Result := False;
{$IFDEF CIL}
  if DbiGetDatabaseDesc(StrToOem(DBName), Desc) <> 0 then Exit;
{$ELSE}
  if DbiGetDatabaseDesc(PChar(StrToOem(DBName)), @Desc) <> 0 then Exit;