vb.net数据重复这样写错在哪里求解
Dim mysql As String
mysql = "SELECT COUNT(*) FROM 表3 UserID='" & Form1.TextBox1.Text() & "'"
Dim da1 As New OleDb.OleDbDataAdapter(mysql, myconn)
Dim ds1 As New DataSet
da1.Fill(ds1, "[表3]")
If ds1.Tables(0).Rows.Count = Form1.TextBox1.Text Then
MsgBox("重复登入")
Else
表3是一个空表,数据登入时候会把数据写进去。。。