delphi中寫SQL語句中變數的注意事項
阿新 • • 發佈：2018-12-13
1、procedure TForm1.btn1Click(Sender: TObject);
var s: String; begin S := 'select * from TMarketInfo where NO='''+'1'''; ShowMessage(s); end; 結果顯示：select * from TMarketInfo where NO='1' 2、procedure TForm1.btn1Click(Sender: TObject); var s: String; begin S := 'select * from TMarketInfo where NO='+'''1'''; ShowMessage(s); end; 結果顯示：select * from TMarketInfo where NO='1' 3、procedure TForm1.btn1Click(Sender: TObject); var s: String; begin S := 'select * from TMarketInfo where NO=''+1'''; ShowMessage(s); end; 結果顯示：select * from TMarketInfo where NO='+1' 4、procedure TForm1.btn1Click(Sender: TObject); var s: String; begin S := 'select * from TMarketInfo where NO='+'1'; ShowMessage(s); end; 結果顯示：select * from TMarketInfo where NO=1