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Tip of the Day
Language: VB7
Expertise: Intermediate
Nov 17, 2003

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CreateDataAdapter - Creating a suitable DataAdapter object for a given connection object

' Create a suitable DataAdapter object for a given connection object.
' Requires Imports for System.Data, System.Data.Common, System.Data.OleDb,
'  System.Data.SqlClient, System.Data.Odbc and System.Data.OracleClient
'
' Example:
'    Dim da As DbDataAdapter = CreateDataAdapter("SELECT * FROM Titles", cn)

Function CreateDataAdapter(ByVal sql As String, ByVal cn As IDbConnection) As _
    DbDataAdapter
    If TypeOf cn Is OleDbConnection Then
        ' Create an OleDbDataAdapter and initialize its properties.
        Dim da As New OleDbDataAdapter(sql, DirectCast(cn, OleDbConnection))
        Dim cb As New OleDbCommandBuilder(da)
        da.UpdateCommand = cb.GetUpdateCommand()
        da.DeleteCommand = cb.GetDeleteCommand()
        da.InsertCommand = cb.GetInsertCommand()
        Return da
    ElseIf TypeOf cn Is SqlConnection Then
        ' Create an SqlDataAdapter and initialize its properties.
        Dim da As New SqlDataAdapter(sql, DirectCast(cn, SqlConnection))
        Dim cb As New SqlCommandBuilder(da)
        da.UpdateCommand = cb.GetUpdateCommand()
        da.DeleteCommand = cb.GetDeleteCommand()
        da.InsertCommand = cb.GetInsertCommand()
        Return da
    ElseIf TypeOf cn Is OdbcConnection Then
        ' Create an SqlDataAdapter and initialize its properties.
        Dim da As New OdbcDataAdapter(sql, DirectCast(cn, OdbcConnection))
        Dim cb As New OdbcCommandBuilder(da)
        da.UpdateCommand = cb.GetUpdateCommand()
        da.DeleteCommand = cb.GetDeleteCommand()
        da.InsertCommand = cb.GetInsertCommand()
        Return da
    ElseIf TypeOf cn Is OracleConnection Then
        ' Create an SqlDataAdapter and initialize its properties.
        Dim da As New OracleDataAdapter(sql, DirectCast(cn, OracleConnection))
        Dim cb As New OracleCommandBuilder(da)
        da.UpdateCommand = cb.GetUpdateCommand()
        da.DeleteCommand = cb.GetDeleteCommand()
        da.InsertCommand = cb.GetInsertCommand()
        Return da
    Else
        Throw New ArgumentException
    End If
End Function
Francesco Balena
 
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