adoquery1问题，请大侠指点
procedure TForm4.Button1Click(Sender: TObject);
begin
form3.adotable1.post;

adotable1.Append; //插入记录
adotable1.FieldByName( 'id ').asstring:=trim(edit1.Text);
adotable1.FieldByName( 'name ').asstring:=trim(edit2.Text);
adotable1.FieldByName( 'ccid ').asstring:=form3.pct;
adotable1.Post;

adotable2.Append;
adotable2.FieldByName( 'tvtxt ').asstring:=trim(edit1.Text);
adotable2.FieldByName( 'tvn ').asstring:= '01 ';
adotable2.post;

adotable2.Append;
adotable2.FieldByName( 'tvtxt ').asstring:=trim(edit2.Text);
adotable2.FieldByName( 'tvn ').asstring:= '03 ';
adotable2.post;


//对form2进行初始化
form2.tabsheet1.tabvisible:=false;
form2.tabsheet2.tabvisible:=false;
form2.tabsheet3.tabvisible:=false;
form2.tabsheet4.tabvisible:=false;
form2.tabsheet5.tabvisible:=false;
form2.pagecontrol1.activepage:=form2.tabsheet6;
//
form2.Button1.Visible:=false;
form2.Button2.Visible:=false;
form2.Button3.Visible:=false;
form2.Button4.Visible:=false;
form2.Button6.Visible:=false;
form2.Button7.Visible:=false;
form2.Button8.Visible:=false;
//
{ ?????有问题
adoquery1.Close;
adoquery1.sql.clear;
adoquery1.SQL.add( 'select * from patient where ccid=form3.pct ');
adoquery1.open;
form2.Edit1.Text:=adoquery1.fieldbyname( 'id ').asstring;
form2.Edit2.Text:=adoquery1.fieldbyname( 'name ').asstring;
form2.Edit27.Text:=adoquery1.fieldbyname( 'id ').asstring;
form2.Edit28.Text:=adoquery1.fieldbyname( 'name ').asstring;

}


form4.Hide;
form2.show;
给的错误就是参数form3.pct没有默认值，pct是我的form3中定义的string全局变量
end;


[解决办法]
'select * from patient where ccid=form3.pct '
form3.pct既然是个变量，那就不能直接填在串中。
'select * from patient where ccid= ' ' '+form3.pct+ ' ' ' '
[解决办法]
来晚了..
楼上正解
'select * from patient where ccid= ' ' '+trim(form3.pct)+ ' ' ' '