如何知道SQL查询后查询到的数据个数!!!!!

[yh1205]

Set cn = New ADODB.Connection
cn.ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" & App.Path & "\sjk.mdb;Persist Security Info=False"
cn.Open
Set rs = New ADODB.Recordset
Dim str As String

If Text1.Text = "" Then MsgBox "用户简称不能为空", vbExclamation + vbOKOnly, "提示": Text1.SetFocus: Exit Sub
If Text2.Text = "" Then MsgBox "用户姓名不能为空", vbExclamation + vbOKOnly, "提示": Text2.SetFocus: Exit Sub
If Text5.Text = "" Then MsgBox "用户密码不能为空", vbExclamation + vbOKOnly, "提示": Text5.SetFocus: Exit Sub
If Combo1.Text <> "标准" And Combo1.Text <> "管理" Then MsgBox "权限应为“标准”或“管理”！", vbExclamation + vbOKOnly, "提示": Exit Sub
str = "select * from 用户 where 简称='" & Text1.Text & "'"
rs.Open str, cn


If rs.RecordCount <> 0 Then
rs.Close
str = "select * from 用户"
rs.Open str, cn, 1, 3
rs.MoveFirst
rs.AddNew
Else
MsgBox "存在相同的用户简称", vbExclamation + vbOKOnly, "提示"
Exit Sub
End If







用recordcount说不行,出错!!!,那用什么呢?

[sy1573]

recordcount可以的说明你代码有错误

[netexe]

rs.Open str, cn, 1, 1

[iiboy]

rs.Open str, cn,1,3

[online]

cn.ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" & App.Path & "\sjk.mdb;Persist Security Info=False"
cn.Open
设置客户端游标
cn.CursorLocation = adUseClient

MsgBox rs.recordcount

[LGYAN]

使用：
str = "select count(简称) from 用户 where 简称='" & Text1.Text & "'"
rs.Open str, cn


If rs.fields(0).value =0 Then
rs.Close
str = "select * from 用户"
rs.Open str, cn, 1, 3
rs.MoveFirst
rs.AddNew
Else
MsgBox "存在相同的用户简称", vbExclamation + vbOKOnly, "提示"
Exit Sub
End If

[bladeinside]

设置cn.CursorLocation = adUseClient

[gpyrbn]

楼上的做法也是可行的!直接统计出一个记录数来判断是否有重复的记录!另外还可以把记录集的cursorlocation属性设置为客户端游标,如:
Set cn = New ADODB.Connection
cn.ConnectionString = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" & App.Path & "\sjk.mdb;Persist Security Info=False"
cn.Open
Set rs = New ADODB.Recordset
Dim str As String

设置客户端游标 rs.cursorlocation=aduseclient

[superxiaomm]

rs.open这里的问题