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cellspacing="1" cellpadding="1" bgcolor="#000000"><tr bgcolor="#FFFFFF"><td width="100%" colspan="4" align="left"><table width="95%" align="center"><tr><td class="font1"><p align="center"><br><font size="3">Delphi筛选数据</font><br><span class="nava"><font color="#CC9933">2000-06-12· -·中国计算机报社</font></span></p><p> 从大量的数据中筛选出具有某种特征的数据是设计数据库应用程序经常碰到的问题，对它的处理方法也是多种多样的。下面介绍几种常见的方法。<br> <br> <strong>设定范围</strong><big><br> </big> 所谓范围，就是指定一个上下界，筛选出落在上下界内的一组连续记录。为方便说明，我们先生成一个项目，并在Form1中放入如下组件：</p> <table border="0" style="font-size: 9pt" cellspacing="1" cellpadding="0" bgcolor="6699cc" width="95%" align="center"> <tbody> <tr> <td align="middle" width="40%">组件名</td> <td align="middle" width="60%">属性</td> </tr> <tr bgcolor="#FFFFFF"> <td height="16" width="40%">Table1</td> <td height="16" width="60%">DatabaseName:=DBDEMOS TableName:=Customer.db</td> </tr> <tr bgcolor="#FFFFFF"> <td width="40%">DataSource1</td> <td width="60%">DataSet:=Table1</td> </tr> <tr bgcolor="#FFFFFF"> <td width="40%">DBGrid1</td> <td width="60%">DataSource:=DataSource1</td> </tr> </tbody> </table> <p> 本例中我们使用了Delphi自带的别名'DBDEMOS'下的一个数据库：Customer.db，这是一个记录顾客基本信息的数据库。当我们把Table1的Active属性置为True时，在DBGrid1中会显示出该库的内容。下面我们往Form1中放入一个Button1，编写Button1的OnClick事件如下：<br> procedure TForm1.Button1Click(Sender: TObject);<br> begin<br> with Table1 do<br> begin<br> KeyExclusive:=True;// 为True时不包括边界值，为False时包括边界值，缺省为False;<br> SetRangeStart;<br> Fieldbyname('CustNo').AsString:='1000'; //设定范围上界<br> SetRangeEnd;<br> FieldbyName('CustNo').AsString:='2000'; //设定范围下界<br> ApplyRange; //使范围生效<br>⌨️ 快捷键说明
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