如何在VB.NET Windows应用程序中创建ADODB断开连接的记录集?
我正在使用OLEDB连接到Sybase数据库,ADODB.dll文件版本为7.10.6070.0(来自Sybase 12.5软件包)。我需要能够打开连接,使用命令对象来填充存储过程中的记录集,然后关闭连接并传回断开连接的记录集。因为每次关闭连接,我的尝试都失败了,我的记录集也关闭(这意味着它没有断开连接)。如何在VB.NET Windows应用程序中创建ADODB断开连接的记录集?
是否有一个属性,我必须设置某处以指示记录集应该断开连接?我无法设置Recordset.ActiveConnection = False,因为我得到一个异常(“不能更改以Command对象为源的Recordset对象的ActiveConnection属性”)。我确实设置了Command.ActiveConnection = False,但是一旦关闭连接对象,就不会停止关闭记录集。
段:
Dim conn as New ADODB.Connection()
conn.Open("connectionString", "UserID", "Password")
Dim cmd as New ADODB.Command()
' Set some parameters on the command.
cmd.ActiveConnection = conn
cmd.CommandText = "StoredProcedureName"
cmd.CommandType = ADODB.CommandTypeEnum.adCmdStoredProc
Dim rs as New ADODB.Recordset()
rs.Open(cmd)
Dim clonedRS as ADODB.Recordset = rs.Clone() ' one attempt to disconnect recordset
rs.Close() ' Does not close cloned recordset
cmd.ActiveConnection = Nothing ' another try at disconnecting recordset
conn.Close() ' Always closes the recordset, even the cloned one
return clonedRS ' Sadly, this is closed now.
我不知道这是否会解决您的问题,但我做了谷歌搜索和本文Disconnect an ADO Recordset generated from a Command object,你可能能够使用修改代码来时如下:
Dim conn as New ADODB.Connection()
conn.Open("connectionString", "UserID", "Password")
Dim cmd as New ADODB.Command()
' Set some parameters on the command.
cmd.ActiveConnection = conn
cmd.CommandText = "StoredProcedureName"
cmd.CommandType = ADODB.CommandTypeEnum.adCmdStoredProc
Dim rs As ADODB.Recordset
With rs
.CursorLocation = adUseClient
.Open cmd, CursorType:=adOpenStatic, Options:=adCmdStoredProc
Set .ActiveConnection = Nothing
End With
Dim clonedRS As ADODB.Recordset = rs
Set cmd = Nothing
conn.Close()
rs.Close()
Set conn = Nothing
Set rs = Nothing
Return clonedRS
有来自4GuysFromRolla Using Disconnected Recordsets另一个例子具有相同的做法。
EDIT
充实的例子。
我错过了记录集上的CursorLocation属性。那就是诀窍。谢谢! –
你可以尝试的东西沿着这条线
Set cmd = New ADODB.command
With cmd
.ActiveConnection = "your connection"
.CommandText = "your proc or ssql"
.CommandType = adCmdStoredProc
' .parameter.append create whether param you need
End With
Set rs = New ADODB.recordset
With rs
.cursorlocation = adUseClient
.cursortype = adOpenStatic
.locktype = adLockBatchOptimistic
Set rs.Source = cmd 'this is the key
.Open
.ActiveConnection = Nothing
End With
' do what ever you need next
使用Dataset对象是否可以接受?然后,您可以使用DataAdapter轻松填充它,而不必担心保持活动连接。 – N0Alias
我必须从这个函数返回一个ADODB.Recordset - 它遍布整个地方。如果我可以使用ADO.NET做一些“现代”数据填充,那么用数据填充旧的ADODB.Recordset,这将是可以接受的,并避免我的问题。 –