vb数据库代码

① VB实现ACCESS数据库记录的查询，新增，删除，修改的代码是什么

“修改”按钮的程序 x0dx0aPrivate Sub cmdEdit_Click() x0dx0asql = "select * from 停时禅橡旅统如液计 where date = cdate('" & Text8.Text & "') and ycqk = '" & Combo1.Text & "'and id = '" & DataGrid1.Columns(2).CellText(DataGrid1.Bookmark) & "'" x0dx0ars.Open sql, dm, adOpenDynamic, adLockOptimistic x0dx0ars.Fields("id") = Text7.Text x0dx0ars.Fields("ycqk") = Combo1.Text x0dx0ars.Fields("date1") = Text1.Text x0dx0ars.Fields("time1") = Text2.Text x0dx0ars.Fields("date2") = Text3.Text x0dx0ars.Fields("time2") = Text4.Text x0dx0ars.Update x0dx0ars.Close x0dx0aEnd Sub x0dx0ax0dx0a'“删除”按钮的程序 x0dx0aPrivate Sub cmdDelete_Click() x0dx0astrFCode = DataGrid1.Columns(0).CellText(DataGrid1.Bookmark) x0dx0astrSCode = DataGrid1.Columns(2).CellText(DataGrid1.Bookmark) x0dx0astrCCode = DataGrid1.Columns(1).CellText(DataGrid1.Bookmark) x0dx0asql = "select * from 停时统计 where date='" & strFCode & "' and id='" & strSCode & "' and ycqk='" & strCCode & "'" x0dx0ars.Open sql, dm, adOpenDynamic, adLockOptimistic x0dx0ars.Delete x0dx0ars.Update x0dx0ars.Close x0dx0aEnd Sub x0dx0ax0dx0a'“增加”按钮的程序 x0dx0aPrivate Sub Command1_Click() x0dx0asql = "select * from 停时贺凳统计 order by id" x0dx0ars.Open sql, dm, adOpenDynamic, adLockOptimistic x0dx0ars.AddNew x0dx0ars.Fields("date") = Date x0dx0ars.Fields("id") = Text7.Text - 1 x0dx0ars.Fields("ycqk") = Combo1.Text x0dx0ars.Fields("date1") = Text1.Text x0dx0ars.Fields("time1") = Text2.Text x0dx0ars.Fields("date2") = Text3.Text x0dx0ars.Fields("time2") = Text4.Text x0dx0ars.Update x0dx0ars.Close x0dx0ax0dx0aWith Adodc1 x0dx0aAdodc1.ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" & App.Path & "\db1.mdb;Persist Security Info=False" x0dx0aAdodc1.RecordSource = "select * from 停时统计 where date = cdate('" & Text8.Text & "') and ycqk = '" & Combo1.Text & "' order by id" x0dx0aAdodc1.Refresh x0dx0aDataGrid1.Refresh x0dx0aEnd With x0dx0aEnd Sub

② vb数据库编程,数据库某些字段不能重复,如果录入数据有重复,保存时，程序自动提醒,怎么编写自动提醒代码。

用Sql语句，查询或者Find方法查询，如果已经存在该记录，就提醒：

如果一下子要保存n行，那有两种选择：
1：检查一行，保存一行。凡是没有重复的都保存，有重复的不保存。
2：先一一检查，检查到有重复就提示，并结束。

不知道你用的是控件还是对象连接的数据库？假设你用Adodc控件，且已经连接。
下面：假设字段a,b为字符类型，以一行数据为例，a字段值为“AA”，b字段值为“BB”，
Adodc1.RecordSource ="Select * From s Where a ='AA' and b = 'BB'"
Adodc1.Refresh
If Not (Adodc1.Recordset.EOF And Adodc1.Recordset.BOF) Then
MsgBox "已经存在相同记录！"
Exit Sub
Else
'下面编写添加记录的代码
End If

上面是当数据a,b一样提示，如果a一样或者b一样就提示，那么：
Adodc1.RecordSource ="Select * From s Where a ='AA' Or b = 'BB'"