Private Function Selectsql(SQL As String) As ADODB.Recordset '返回ADODB.Recordset對象
Dim ConnStr As String
Dim Conn As ADODB.Connection
Dim rs As ADODB.Recordset
Set rs = New ADODB.Recordset
Set Conn = New ADODB.Connection
'On Error GoTo MyErr:
ConnStr = "Provider=SQLOLEDB.1;Persist Security Info=True;User ID=登錄數據庫用戶名(默認為sa);Password=登錄數據庫密碼;Initial Catalog=數據庫名;Data Source=服務器名(默認為:MERRYCHINA)" '這是連接SQL數據庫的語句
Conn.Open ConnStr
rs.CursorLocation = adUseClient
rs.Open Trim$(SQL), Conn, adOpenDynamic, adLockOptimistic
Set Selectsql = rs
'Exit Function
'MyErr:
'Set rs = Nothing
'Set Conn = Nothing '釋放相關的系統資源
'MsgBox Err.Description, vbInformation, "系統提示" '顯示出錯信息
End Function
Private Sub Form_Load()
Dim SQL As String
Dim rs As ADODB.Recordset
Dim X As Long
On Error GoTo Err_box
SQL = " select * from 用戶表"
Set rs = Selectsql(SQL)
If rs.RecordCount > 0 Then
rs.MoveFirst
For X = 1 To rs.RecordCount
Combo1.AddItem rs.Fields("用戶名").Value
rs.MoveNext
Next X
Combo1.ListIndex = 0
End If
rs.Close
Exit Sub
Err_box:
End Sub
Private Sub Command1_Click()
Dim SQL As String
Dim rs As ADODB.Recordset
If Text1.Text = "" Then
MsgBox "請輸入口令!", 16
Text1.SetFocus
Exit Sub
End If
If Combo1.Text = "" Then
MsgBox "請選擇登錄用戶!", 16
Combo1.SetFocus
Exit Sub
End If
SQL = "SELECT * FROM 用戶表 WHERE 用戶名='" & Combo1.Text & "' AND 密碼='" & Text1.Text & "' "
Set rs = Selectsql(SQL)
If rs.RecordCount > 0 Then
Form1.Show '想要打開的主窗體
MsgBox "恭喜兄弟,登錄成功!", 64, "提示"
Unload Me
Else
MsgBox "口令不對,請重新輸入!", 16, "提示"
Text1.SetFocus
End If
End Sub
'**********************************************************************
'說明:1) 在工程中引用Microsoft ActiveX Data Objects 2.8 Library ,其它版本也行如:2.0
' 2) 在窗體中加Texe1.text(文本框控件),Combo1.text(組合框控件),Command1(命令按鈕)各壹個
' 3) 在SQL Server2000中創建數據庫，新建表"用戶表",表中包含"ID,姓名,密碼"等字段,然後將以上代碼復制,OK搞定
4) 以上方式無需加載ADO控件,方便!