数据集sql语句写法

Posted 2020-09-19 delphi学习交流吧

写法1：直接把变量值包含在sql的表达式中；

with frmDataPool.qry用户账号表 do
 begin
  Close;
  SQL.Text:=‘select * from 用户账号表 where admid = ‘ + QuotedStr(edtAdmid.Text) + ‘ AND admps = ‘ + QuotedStr(edtAdmps.Text);
  Open;
 end;

写法2：用参数

with frmDataPool.qry用户账号表 do
begin
  Close;
  SQL.Text:=‘select * from 用户账号表 where admid = :admid  AND admps =:admps ‘;  
  Parameters.ParamByName(‘admid‘).Value:=edtAdmid.Text; //为admid参数赋值； 
  Parameters.ParamByName(‘admps‘).Value:=edtAdmps.Text; //为admps参数赋值；
  Open; 
end;