Open 和 Close 方法范例 (VB)

本范例在已打开的 Recordset 和 Connection 对象使用 Open 和 Close 方法。

Public Sub OpenX()

    Dim cnn1 As ADODB.Connection
    Dim rstEmployees As ADODB.Recordset
    Dim strCnn As String
    Dim varDate As Variant

    ' Open connection.
        strCnn = "Provider=sqloledb;" & _
        "Data Source=srv;Initial Catalog=Pubs;User Id=sa;Password=; "
    Set cnn1 = New ADODB.Connection
    cnn1.Open strCnn
   
    ' Open employee table.
    Set rstEmployees = New ADODB.Recordset
    rstEmployees.CursorType = adOpenKeyset
    rstEmployees.LockType = adLockOptimistic
    rstEmployees.Open "employee", cnn1, , , adCmdTable

    ' Assign the first employee record's hire date
    ' to a variable, then change the hire date.
    varDate = rstEmployees!hire_date
    Debug.Print "Original data"
    Debug.Print "  Name - Hire Date"
    Debug.Print "  " & rstEmployees!fName & " " & _
        rstEmployees!lName & " - " & rstEmployees!hire_date
    rstEmployees!hire_date = #1/1/1900#
    rstEmployees.Update
    Debug.Print "Changed data"
    Debug.Print "  Name - Hire Date"
    Debug.Print "  " & rstEmployees!fName & " " & _
        rstEmployees!lName & " - " & rstEmployees!hire_date

    ' Requery Recordset and reset the hire date.
    rstEmployees.Requery
    rstEmployees!hire_date = varDate
    rstEmployees.Update
    Debug.Print "Data after reset"
    Debug.Print "  Name - Hire Date"
    Debug.Print "  " & rstEmployees!fName & " " & _
        rstEmployees!lName & " - " & rstEmployees!hire_date

    rstEmployees.Close
    cnn1.Close

End Sub