Question

哪一个合适？

Methot 1

Dim Connection As New SqlConnection
Dim CMD As New SqlCommand
Connection = New SqlConnection(My.Settings.ConnectionString)
CMD = Connection.CreateCommand()
CMD.Connection.Open()

CMD.CommandText = "Insert Into TableName................."
CMD.ExecuteNonQuery()
CMD.CommandText = "Update TableName Set................."
CMD.ExecuteNonQuery()

Connection.Close()
Connection.Dispose()
CMD.Dispose()

Methot 2

Dim Connection As New SqlConnection
Dim CMD As New SqlCommand
Connection = New SqlConnection(My.Settings.ConnectionString)
Connection.Open()
CMD = Connection.CreateCommand()

CMD.CommandText = "Insert Into TableName................."
CMD.ExecuteNonQuery()
CMD.CommandText = "Update TableName Set................."
CMD.ExecuteNonQuery()

Connection.Close()
Connection.Dispose()
CMD.Dispose()

这两种方法都运行得很好。但我很困惑使用哪一个。请帮忙。

Answer 1

正如David的评论中所提到的，两种方法之间没有功能差异。

这两种方法都在同一个SqlConnection上调用.Open（）宾语。他们只是在创建SqlCommand之前或之后执行此操作宾语。创建SqlCommand对象并打开连接不依赖于彼此，所以顺序没有区别。

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