vb连接数据库

概述Private Sub cmd1_Click()     Dim cnn As ADODB.Connection   Dim my_recordset As ADODB.Recordset   Dim connect_string As String   Dim statestring As String   Set cnn = New ADODB.Connection   Set my_reco Private Sub cmd1_Click() Dim cnn As ADODB.Connection Dim my_recordset As ADODB.Recordset Dim connect_string As String Dim statestring As String Set cnn = New ADODB.Connection Set my_recordset = New ADODB.Recordset '连接Access数据库 connect_string = "DSN=medic_lib97;UID=;PSW=" cnn.Open connect_string Select Case cnn.State Case adStateClose statestring = "adStateClosed" Case adStateOpen statestring = "adStateOpen" End Select '显示连接的状态 MsgBox "连接成功！",statestring If Trim(Combo1.Text = "") Then MsgBox ("用户名不能为空，请重新输入！") txt2.Text = "" Combo1.SetFocus Else If Trim(txt2.Text = "") Then MsgBox ("密码不能为空，请重新输入！") txt2.Text = "" txt2.SetFocus Else my_recordset.Open "select * from user where ID='" & Combo1.Text & "'",cnn If my_recordset.EOF = True Then MsgBox ("用户名不存在！") Combo1.Text = "" txt2.Text = "" Combo1.SetFocus Else If (Trim(txt2.Text) = my_recordset.FIElds("passwd")) Then Me.HIDe Frm_main.Show 'MsgBox ("登陆成功！") Else MsgBox ("密码错误，登录失败！") txt2.Text = "" txt2.SetFocus End If End If End If End If End Sub 总结

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