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1¡¢ADOConnection1ÉèÖÃ
1£©Ë«»÷ADOConnection1£¬½øÐÐÉèÖÃÁ¬½Ó×Ö·û´®£¨×÷ÓÃÊÇ£ºÑ¡È¡Á¬½ÓÇý¶¯·½Ê½ºÍÁ¬½ÓµÄÊý¾Ý¿âÉèÖã©¡£¹ý³ÌÈçÏÂͼËùʾ£º
2¡¢ADOQuery1ÉèÖãº
1£©ADOQuery1.connectionÊôÐÔΪADOConnection1;
2£©ADOQuery1.SQLÊôÐÔΪselect student.sno,sname,cname,grade from student,sc,course where student.sno=sc.sno and course.cno=sc.cno
3£©ADOQuery1.ActiveÉèÖÃΪTRUE¡£
3¡¢DataSource1ÉèÖÃ
DataSetÊôÐÔΪADOQuery1
4¡¢DBGrid1ÉèÖÃ
DataSourceÊôÐÔÉèÖÃΪDataSource1.
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1¡¢½çÃæÉè¼Æ
Ìí¼ÓEdit£¬ButtonºÍLabel¿Ø¼þ£¬Èçͼ°Ú·ÅºÍÉèÖûù±¾ÊôÐÔ¡£
2¡¢ÔÚBitBtn1µÄClickʼþÄÚÍê³É³ÌÐò¡££¨Edit1ºÍEdit2µÄ×ۺϲéѯ£¬¹²4ÖÖÇé¿ö£©
procedure TForm1.BitBtn1Click(Sender: TObject);
var
i:integer;
SqlStr:String;
begin
i:=0;
if edit1.Text<>'' then
i:=i+1;
if edit2.Text<>'' then
i:=i+2;
case i of
0:
begin
SqlStr:='select student.sno,sname,cname,grade from student,sc,course '
+'where student.sno=sc.sno and course.cno=sc.cno ';
adoquery1.Close; //¹Ø±ÕADOQuery1£¬ÒÔ±ãÓÚ½øÐÐSQLÓï¾ä¸üÐÂ
adoquery1.SQL.Clear; //Çå¿ÕSQLÓï¾ä
adoquery1.SQL.Add(sqlStr); //Ìí¼ÓеÄSQL
adoquery1.Open; //ÐÂSQLÓÐЧ
end;
1:
begin
SqlStr:='select student.sno,sname,cname,grade from student,sc,course '
+'where student.sno=sc.sno and course.cno=sc.cno and sname='''+edit1.Text+'''';
adoquery1.Close; //¹Ø±ÕADOQuery1£¬ÒÔ±ãÓÚ½øÐÐSQLÓï¾ä¸üÐÂ
adoquery1.SQL.Clear; //Çå¿ÕSQLÓï¾ä
adoquery1.SQL.Add(sqlStr); //Ìí¼ÓеÄSQL
adoquery1.Open; //ÐÂSQLÓÐЧ
end;
2:
begin
SqlStr:='select student.sno,sname,cname,grade from student,sc,course '
+'where student.sno=sc.sno and course.cno=sc.cno and cname='''+edit2.Text+'''';
adoquery1.Close;
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