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      VB.net 2010 視頻教程 VB.net 2010 視頻教程 VB.net 2010 視頻教程
      SQL Server 2008 視頻教程 c#入門經典教程 Visual Basic從門到精通視頻教程
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      • 靜態SQL語句和動態SQL語句在程序中的使用

      • 2015-01-25 09:35 來源:未知
      二、在程序中使用靜態SQL語句

      sql語句大全

        在程序設計階段,將SQL命令文本作為TQuery組件的SQL屬性值設置。

      三、在程序中使用動態SQL語句
        動態SQL語句是指在SQL語句中包含有參數變量的SQL語句(如:select * from student where class=:class),在程序中可以為參數賦值。給參數賦值的方法有:

        1、利用參數編輯器為參數賦值
        選中TQuery組件,在對象監視器OI中點取Params項,在彈出的參數編輯窗口中設置參數的值。
      例:SELECT bookidx AS 書號,藏書表.bookname AS 書名, bdate AS 借書日期 FROM 借書表,藏書表 where 借書表.bookidx=藏書表.bookidx and rid=:rid

        2、在程序運行中通過程序為參數賦值
      (1)根據參數在SQL語句中出現的順序,使用TQuery的Params屬性為參數賦值;

      例:在借書表中插入一條記錄
      with Query1 do
      begin
        SQL.clear;
        SQL.add('Insert Into 借書表(bookidx,rid,rdate)');
        SQl.add('Values(:bookidx,:rid,:rdate)');
        Params[0].AsString := bookidxEdit.Text;
        Params[1].AsString := ridEdit.Text;
        Params[2] .AsDate:=date;
        ExecSQL;
      End;

      (2)根據SQL語句中的參數名字,調用ParamByName方法為參數賦值;
      ParamByName('bookidx').AsString := bookidxEdit.Text;
      ParamByName('rid').AsString := ridEdit.Text;
      ParamByName('rdate') .AsDate:=date;
      ExecSQL;
      有:AsString 、AsSmallInt 、AsInteger 、AsWord 、AsBoolean 、AsFloat 、AsCurrency 、AsBCD 、AsDate 、AsTime 、AsDateTime轉換函數

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