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Delphi中运用ACCESS技巧集

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1.DELPHI中*作ACCESS数据库(树立.mdb文件,紧缩数据库)
以下代码在WIN2K,D6,MDAC2.6下测试通过,
编译好的程序在WIN98第二版无ACCESS环境下运转成功.
//在之前uses ComObj,ActiveX
//声明衔接字符串
Const
SConnectionString = 'Provider=Microsoft.Jet.OLEDB.4.0;Data Source=%s;'
+'Jet OLEDB:Database Password=%s;';

//=============================================================================
// Procedure: GetTempPathFileName
// Author : ysai
// Date : 2003-01-27
// Arguments: (None)
// Result : string
//=============================================================================
function GetTempPathFileName():string;
//获得暂时文件名
var
SPath,Sfile:array [0..254] of char;
begin
GetTempPath(254,SPath);
GetTempFileName(SPath,'~SM',0,SFile);
result:=SFile;
DeleteFile(PChar(result));
end;

//=============================================================================
// Procedure: CreateAccessFile
// Author : ysai
// Date : 2003-01-27
// Arguments: FileName:String;PassWord:string=''
// Result : boolean
//=============================================================================
function CreateAccessFile(FileName:String;PassWord:string=''):boolean;
//树立Access文件,假如文件存在则失利
var
STempFileName:string;
vCatalog:OleVariant;
begin
STempFileName:=GetTempPathFileName;
try
vCatalog:=CreateOleObject('ADOX.Catalog');
vCatalog.Create(format(SConnectionString,[STempFileName,PassWord]));
result:=CopyFile(PChar(STempFileName),PChar(FileName),True);
DeleteFile(STempFileName);
except
result:=false;
end;
end;

//=============================================================================
// Procedure: CompactDatabase
// Author : ysai
// Date : 2003-01-27
// Arguments: AFileName,APassWord:string
// Result : boolean
//=============================================================================
function CompactDatabase(AFileName,APassWord:string):boolean;
//紧缩与修正数据库,掩盖源文件
var
STempFileName:string;
vJE:OleVariant;
begin
STempFileName:=GetTempPathFileName;
try
vJE:=CreateOleObject('JRO.JetEngine');
vJE.CompactDatabase(format(SConnectionString,[AFileName,APassWord]),
format(SConnectionString,[STempFileName,APassWord]));
result:=CopyFile(PChar(STempFileName),PChar(AFileName),false);
DeleteFile(STempFileName);
except
result:=false;
end;
end;

//=============================================================================
// Procedure: ChangeDatabasePassword
// Author : ysai
// Date : 2003-01-27
// Arguments: AFileName,AOldPassWord,ANewPassWord:string
// Result : boolean
//=============================================================================
function ChangeDatabasePassword(AFileName,AOldPassWord,ANewPassWord:string):boolean;
//修正ACCESS数据库暗码
var
STempFileName:string;
vJE:OleVariant;
begin
STempFileName:=GetTempPathFileName;
try
vJE:=CreateOleObject('JRO.JetEngine');
vJE.CompactDatabase(format(SConnectionString,[AFileName,AOldPassWord]),
format(SConnectionString,[STempFileName,ANewPassWord]));
result:=CopyFile(PChar(STempFileName),PChar(AFileName),false);
DeleteFile(STempFileName);
except
result:=false;
end;
end;

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