如何对数据库进行添加、删除等操作？
例如在VB里建个窗体，有用户名，密码，确认密码添加，取消，点确定后，先从数据库里查询输入的用户名是否存在，若不存在切两次输的密码一致，
则在数据库表里添加该用户名和密码。有没有人把代码写出来啊？
万分感谢！！
参考答案:Private Sub Command1_Click()
Dim mrc As ADODB.Recordset
txtsql = "select username from use where username='" & Trim(Text1.Text) & "'"
Set mrc = ExecuteSQL(txtsql)
If mrc.EOF = True Then
MsgBox " 用户名错误！", vbExclamation + vbOKOnly, "警告"
Text1.SetFocus
Text1.SelStart = 0
Text1.SelLength = Len(Text1.Text)
Exit Sub
End If
username = mrc.Fields(0)
txtsql = "select username from use where password='" & Trim(Text2.Text) & "'"
Set mrc = ExecuteSQL(txtsql)
If mrc.EOF = True Then
MsgBox " 密码错误！", vbExclamation + vbOKOnly, "警告"
Text2.SetFocus
Text2.SelStart = 0
Text2.SelLength = Len(Text2.Text)
Exit Sub
End If
MDIForm1.Show
Unload Me
End Sub
Private Sub Command2_Click()
Unload Me
End Sub
Private Sub Text1_KeyPress(KeyAscii As Integer)
If KeyAscii = 13 Then
Text2.SetFocus
End If
End Sub
Private Sub Text2_KeyPress(KeyAscii As Integer)
If KeyAscii = 13 Then
Command1.SetFocus
End If
End Sub