引用：microsoft activex data objects 2.7library
添加模块：
Public conn As ADODB.Connection
Public rs As ADODB.Recordset
Public addFlag As Boolean      '声明部分
Public Function OpenCn(ByVal Cip As String, ByVal users As String, ByVal pw As String) As Boolean '连接模块 填写数据库等信息
Dim mag As String
On Error GoTo strerrmag
Set conn = New ADODB.Connection
conn.ConnectionTimeout = 25
conn.Provider = "sqloledb"
conn.Properties("data source").Value = Cip    '服务器的名字
conn.Properties("initial catalog").Value = "ysmy"          '数据库名称
'conn.Properties("integrated security").Value = "SSPI"      '登陆类型
conn.Properties("user id").Value = users 'SQL库名
conn.Properties("password").Value = pw '密码
'sql = "Provider=SQLOLEDB.1;Persist Security Info=False;User ID=sa;password=;Initial Catalog=pubs;Data Source=127.0.0.1"    '如果不用这个模块也行可以，这一句便是常用的引擎。
'conn.ConnectionString = sql
conn.Open
OpenCn = True
If conn.State = 1 Then addFlag = True
Exit Function
strerrmag:
    mag = "连接服务器出错！"
    Call MsgBox(mag, vbOKOnly, "Error:Data connect")
    addFlag = False
    Exit Function      '连接错误消息
End Function
'关闭数据库，释放连接
Public Sub cloCn()
On Error Resume Next
If conn.State <> adStateClosed Then conn.Close
Set conn = Nothing
End Sub
Public Function openRs(ByVal strsql As String) As Boolean      '连接数据库记录集
Dim mag As String
Dim rpy As Boolean
On Error GoTo strerrmag
    Set rs = New ADODB.Recordset
    If addFlag = False Then rpy = True
    With rs
    .ActiveConnection = conn
    .CursorLocation = adUseClient
    .CursorType = adOpenKeyset
    .LockType = adLockOptimistic
    .Open strsql
    End With
    addFlag = True
    openRs = True
    'End        '将记录集给rs
    Exit Function
strerrmag:
    mag = "没有此用户名，请核对，或与销售部联系！"
    Call MsgBox(mag, vbOKOnly, "error:重庆市尹氏木业有限公司")
    openRs = False
    End
    'Exit Function '连接错误消息
End Function
Public Sub cloRs()
On Error Resume Next
If rs.State <> adStateClosed Then rs.Clone
Set rs = Nothing '释放记录集
End Sub
窗体代码; '连接数据库
Dim a, b, c
a = Trim("124.161.103.131")
b = Trim("sa")
c = Trim("aqmy67612081")
Call OpenCn(a, b, c)
If addFlag = False Then
Unload Form4
  MsgBox "连接服务器出错！", vbOKOnly, "系统提示"
Exit Sub
excel连接sql数据库教程Else
MsgBox "连接数据库成功"
End If