Question

我需要通过ADO.NET创建临时表，在temp和实际表之间的服务器上执行BulkCopy然后Merge。

问题是使用纯ADO.NET创建临时表动态。模式应该与现有表相同，但是这个表是使用ORM（NHibernate或实体框架，我们还不确定）创建的。这也意味着架构将来可能会发生变化。

有没有办法使用普通的ADO.NET对象在数据库中创建表？比如包含原始表格架构的DataTable？

任何指向正确方向的信息都会受到赞赏。

Answer 1

您可以使用select into #somename创建临时表。

connection_ = New SqlClient.SqlConnection(connection_string_)
connection_.Open()
If connection_.State = ConnectionState.Open Then

    command_.Connection = connection_
    command_.CommandType = CommandType.Text
    command_.CommandText = "select * into #some_table from some_table where some_id = 0"
    command_.ExecuteNonQuery()

    Dim line_index_ As Integer = 0
    Dim data_table_ As DataTable = New DataTable()
    Using parser_ As FileIO.TextFieldParser = New FileIO.TextFieldParser(path_)
        parser_.SetDelimiters(delimiter_)
        parser_.HasFieldsEnclosedInQuotes = False
        While Not parser_.EndOfData
            If line_index_ = 0 Then
                Dim headers_ As String() = parser_.ReadFields()
                For Each header_ In headers_
                    data_table_.Columns.Add(header_)
                Next
            Else
                Dim row_ As DataRow = data_table_.NewRow()
                row_.ItemArray = parser_.ReadFields()
                data_table_.Rows.Add(row_)
            End If
            line_index_ += 1
        End While
     End Using

     Using bulkCopy_ As SqlBulkCopy = New SqlBulkCopy(connection_)
           bulkCopy_.DestinationTableName = "#some_table"
           bulkCopy_.WriteToServer(data_table_)
     End Using

    ' proof
    command_.CommandText = "select * from #some_table"
    Dim reader_ As SqlDataReader = Nothing
    reader_ = command_.ExecuteReader
    line_index_ = 0
    While reader_.Read
        line_index_ += 0
    End While

 End If

Answer 2

我设法根据现有架构创建临时表。

Blogged the solution on my site

在ADO.NET中使用动态创建的临时表进行批量复制

2 个答案: