如何判断输入DBEDIT里的数据是空字符? if Trim(db_studentid.Field.AsString) = '' then //建议 解决方案 » 免费领取超大流量手机卡,每月29元包185G流量+100分钟通话, 中国电信官方发货 你不会输入全角空格吧?这就要处理处理了Trim(StringReplace(db_studentid.Field.AsString, ' ', ' ', [rfReplaceAll])) 改为:if (db_studentid.Text ='') or (b_studentid.Text =null) then begin messagedlg('请您输入学号',mtinformation,[mbyes],0);0A db_studentid.SetFocus; exit; end;倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊倪倪倪倪倪倪磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊倪倪倪倪倪倪倪倪倪倪倪磊磊磊倪倪倪倪倪倪倪倪磊磊磊倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪磊磊磊倪倪倪倪倪倪倪倪磊磊磊倪倪倪倪倪倪倪倪倪磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊倪倪磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊倪倪磊磊磊磊倪倪倪倪磊磊磊倪倪倪倪倪倪倪倪磊磊磊倪倪倪磊磊磊倪倪磊磊磊倪倪倪倪磊磊磊倪倪倪倪倪倪倪倪磊磊磊倪倪倪倪磊磊磊倪倪磊磊磊倪倪倪磊磊磊倪倪倪倪倪倪倪倪倪倪磊磊磊倪倪倪磊磊磊倪倪磊磊磊倪倪磊磊磊倪倪倪倪倪倪倪倪倪倪倪倪磊磊磊倪倪磊磊磊倪倪磊磊磊倪磊磊磊倪倪倪倪倪倪倪倪倪倪倪倪倪倪磊磊磊倪磊磊磊倪倪磊磊磊倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪磊磊磊倪倪磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊倪倪磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊倪倪倪倪倪倪磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊倪倪倪倪倪倪磊磊磊倪倪倪倪倪倪倪倪磊磊磊倪倪倪倪倪倪倪磊磊磊倪倪倪倪倪倪磊磊磊倪倪倪磊磊磊磊磊磊磊磊磊磊磊磊倪倪倪磊磊磊倪倪倪倪倪倪磊磊磊倪倪倪倪倪倪倪倪磊磊磊倪倪倪倪倪倪倪磊磊磊倪倪倪倪倪倪磊磊磊倪磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊倪磊磊磊倪倪倪倪倪倪磊磊磊倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪磊磊磊倪倪倪倪倪倪磊磊磊倪倪倪倪倪磊磊磊磊磊磊磊磊倪倪倪倪倪磊磊磊倪倪倪倪倪倪磊磊磊倪倪倪倪倪磊磊倪倪倪倪磊磊倪倪倪倪倪磊磊磊倪倪倪倪倪倪磊磊磊倪倪倪倪倪磊磊倪倪倪倪磊磊倪倪倪倪倪磊磊磊倪倪倪倪倪倪磊磊磊倪倪倪倪倪磊磊倪倪倪倪磊磊倪倪磊倪倪磊磊磊倪倪倪倪倪磊磊磊倪倪倪倪倪倪磊磊磊磊磊磊磊磊倪倪磊磊倪磊磊磊倪倪倪倪磊磊磊倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪磊磊磊磊磊倪倪倪磊磊磊倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪磊磊磊磊倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪磊磊磊倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪磊磊磊磊倪倪倪倪倪磊磊磊倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪磊磊磊倪倪倪倪倪倪磊磊磊倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪磊磊倪倪倪倪倪倪倪磊磊磊倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊倪倪倪倪倪倪倪磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊倪倪倪倪倪倪磊磊倪倪倪倪倪倪倪倪倪倪磊磊磊倪倪倪倪倪倪倪倪倪倪倪倪倪倪磊磊倪倪倪倪倪倪倪倪倪倪倪磊磊磊倪倪倪倪倪倪倪倪倪倪倪倪倪磊倪倪倪倪倪磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊倪倪倪倪倪倪倪倪倪倪倪倪磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪磊磊磊倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪磊磊磊倪倪倪倪倪倪倪倪倪倪倪倪倪倪磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊倪倪磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊倪倪倪倪倪倪倪 不可能啊,我也是在程序中写过的if trim(DBEdit1.Text) = '' then...你的不可以?真怪,是不是那儿设置了什么?不过,你看清了,如果的数据库里存的是' ',那么判断肯定不成功; Trim(db_studentid.Field.Value) = '' Trim()代表去掉一个字符串前后的空格 奇怪,这怎么跟全角半角有关呢?zswang(伴水)(* 嘻 *) 前辈指点一二? 再请前辈指点Trim(StringReplace(db_studentid.Field.AsString, ' ', ' ', [rfReplaceAll]))是什么意思,特别是rfreplaceAll是什么意思? rfReplaceAll是将字符串里的所有前面那个全角' '替换为后面的' ',之后在去掉空格' FMTBCD类型的数据怎样输入? DB2的DEcimal字段类型赋值溢出 有关ShellExecute 用nmhttp或idhttp自动在留言板发帖的软件 请教各位一个头大的问题(关于串口通讯的问题)? 来者有分!!! 谁有delphi5.0啊,十万火急啊,Help me,在线等待,若有,我可以加分阿!!!! 请问dbgrideh控件如何进行排序,先要把哪个属性打开才能在title看到小箭头? 怎样用程序实现设置默认打印机 mediaplayer播放数据库文件 我的小问题,看看...... 请问谁有《DELPHI 5企业级解决方案及应用剖析》随书附带的光盘,或是谁知道哪里有下载的?多谢!
Trim(StringReplace(db_studentid.Field.AsString, ' ', ' ', [rfReplaceAll]))
if (db_studentid.Text ='') or (b_studentid.Text =null) then
begin
messagedlg('请您输入学号',mtinformation,[mbyes],0);
0A db_studentid.SetFocus;
exit;
end;倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪
倪倪倪磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊倪倪倪
倪倪倪磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊倪倪倪
倪倪倪倪倪倪倪倪磊磊磊倪倪倪倪倪倪倪倪磊磊磊倪倪倪倪倪倪倪倪
倪倪倪倪倪倪倪倪磊磊磊倪倪倪倪倪倪倪倪磊磊磊倪倪倪倪倪倪倪倪
倪磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊倪
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倪磊磊磊磊倪倪倪倪磊磊磊倪倪倪倪倪倪倪倪磊磊磊倪倪倪磊磊磊倪
倪磊磊磊倪倪倪倪磊磊磊倪倪倪倪倪倪倪倪磊磊磊倪倪倪倪磊磊磊倪
倪磊磊磊倪倪倪磊磊磊倪倪倪倪倪倪倪倪倪倪磊磊磊倪倪倪磊磊磊倪
倪磊磊磊倪倪磊磊磊倪倪倪倪倪倪倪倪倪倪倪倪磊磊磊倪倪磊磊磊倪
倪磊磊磊倪磊磊磊倪倪倪倪倪倪倪倪倪倪倪倪倪倪磊磊磊倪磊磊磊倪
倪磊磊磊倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪磊磊磊倪
倪磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊倪
倪磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊倪
倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪
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倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪
倪倪倪磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊倪倪倪
倪倪倪磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊倪倪倪
倪倪倪磊磊磊倪倪倪倪倪倪倪倪磊磊磊倪倪倪倪倪倪倪磊磊磊倪倪倪
倪倪倪磊磊磊倪倪倪磊磊磊磊磊磊磊磊磊磊磊磊倪倪倪磊磊磊倪倪倪
倪倪倪磊磊磊倪倪倪倪倪倪倪倪磊磊磊倪倪倪倪倪倪倪磊磊磊倪倪倪
倪倪倪磊磊磊倪磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊倪磊磊磊倪倪倪
倪倪倪磊磊磊倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪磊磊磊倪倪倪
倪倪倪磊磊磊倪倪倪倪倪磊磊磊磊磊磊磊磊倪倪倪倪倪磊磊磊倪倪倪
倪倪倪磊磊磊倪倪倪倪倪磊磊倪倪倪倪磊磊倪倪倪倪倪磊磊磊倪倪倪
倪倪倪磊磊磊倪倪倪倪倪磊磊倪倪倪倪磊磊倪倪倪倪倪磊磊磊倪倪倪
倪倪倪磊磊磊倪倪倪倪倪磊磊倪倪倪倪磊磊倪倪磊倪倪磊磊磊倪倪倪
倪倪磊磊磊倪倪倪倪倪倪磊磊磊磊磊磊磊磊倪倪磊磊倪磊磊磊倪倪倪
倪磊磊磊倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪磊磊磊磊磊倪倪倪
磊磊磊倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪磊磊磊磊倪倪倪
倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪倪
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倪倪倪倪倪倪倪倪倪倪倪倪倪倪磊磊磊倪倪倪倪倪倪倪倪倪倪倪倪倪
倪倪倪倪倪磊磊磊磊倪倪倪倪倪磊磊磊倪倪倪倪倪倪倪倪倪倪倪倪倪
倪倪倪倪倪磊磊磊倪倪倪倪倪倪磊磊磊倪倪倪倪倪倪倪倪倪倪倪倪倪
倪倪倪倪倪磊磊倪倪倪倪倪倪倪磊磊磊倪倪倪倪倪倪倪倪倪倪倪倪倪
倪倪倪倪磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊倪倪倪倪
倪倪倪磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊倪倪倪倪
倪倪磊磊倪倪倪倪倪倪倪倪倪倪磊磊磊倪倪倪倪倪倪倪倪倪倪倪倪倪
倪磊磊倪倪倪倪倪倪倪倪倪倪倪磊磊磊倪倪倪倪倪倪倪倪倪倪倪倪倪
磊倪倪倪倪倪磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊倪倪倪倪倪倪
倪倪倪倪倪倪磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊倪倪倪倪倪倪
倪倪倪倪倪倪倪倪倪倪倪倪倪倪磊磊磊倪倪倪倪倪倪倪倪倪倪倪倪倪
倪倪倪倪倪倪倪倪倪倪倪倪倪倪磊磊磊倪倪倪倪倪倪倪倪倪倪倪倪倪
倪磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊倪
倪磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊磊倪
倪倪倪倪倪倪
if trim(DBEdit1.Text) = '' then
...
你的不可以?
真怪,是不是那儿设置了什么?
不过,你看清了,如果的数据库里存的是' ',那么判断肯定不成功;
Trim(StringReplace(db_studentid.Field.AsString, ' ', ' ', [rfReplaceAll]))
是什么意思,特别是rfreplaceAll是什么意思?