excel VBA动态链接数据库

Function GETPMAX(SID As String) As String

    Dim result As String
    
    ‘链接数据库
    Set Cnn = CreateObject("ADODB.Connection")
    Set rt = CreateObject("ADODB.Recordset")
    
    Cnn.ConnectionString = "Provider = SQLOLEDB;User ID= ;password=;Data Source=;Initial Catalog = "
    Cnn.Open
    Sql = "SELECT TOP 1 Pmax FROM dbo where ID=‘" & SID & "‘ order by hDateTime desc"
    
     ‘获取记录集
    Set rt = Cnn.Execute(Sql)
   
     ‘根据字段获取值
    result = CStr(rt("Pmax"))
    
    GETPMAX = result
    
    ‘关闭记录集
    rt.Close
    
    ‘关闭数据库链接,释放资源
    Cnn.Close

End Function