手把手教你使用VB來創建ASP組件(4) 

2019-11-18 20:56:35

字體：大中小

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3、 Add方法

　　Add方法的目的是向數據庫中添加一條新的CD信息，因此它打開的記錄集要求能夠更新。這就不能像OpenDB中那樣僅用Open打開數據集。詳細的代碼見下面：

PRivate Sub Add(Id As String, Name As String, Author As String, Price As Currency, Information As String)

Dim NewConn As New ADODB.Connection

Dim NewRecordsetCD As New ADODB.Recordset

NewConn.Open "Provider=SQLOLEDB;DataSource=MUSE;Initial Catalog=Music;UserId=Wayne;PassWord=AbCdEfG"

NewRecordsetCD.Open "SELECT * FROM CD", NewConn, adOpenDynamic, adLockOptimistic

NewRecordsetCD.AddNew

NewRecordsetCD.Fields("CD_ID") = Id

NewRecordsetCD.Fields("CD_Name") = Name

NewRecordsetCD.Fields("CD_Author") = Author

NewRecordsetCD.Fields("CD_Price") = Price

NewRecordsetCD.Fields("CD_Information") = Information

NewRecordsetCD.Update

End Sub

解釋：使用 NewRecordsetCD.AddNew,

NewRecordsetCD.Fields(“Some_Key”)=Some_Value

NewRecordsetCD.Update 來添加一條紀錄

4、 Delete方法：

　　這個方法的目的是為了刪除庫中的某條CD名和相關的信息。它的實現方法是通過查詢表中唯一的CD_ID來定位CD信息，從而刪除該行紀錄

Private Sub Delete(Id As String)

Dim NewConn As New ADODB.Connection

Dim RecordsetDelete As New ADODB.Recordset

NewConn.Open "Provider=SQLOLEDB;DataSource=MUSE;Initial Catalog=Music;UserId=Wayne;Password=AbCdEfG"

’從表中刪除一條信息

NewConn.Execute "DELETE FROM CD WHERE CD_ID ='" & Id & "'", adCmdText + adExecuteNoRecords

End Sub

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