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Statement接口中的execute Query（String sql）方法返回的数据类型是（）
- A、Statement接口实例
- B、Connection接口实例
- C、Database Meta Data类的对象
- D、Result Set类的对象
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单选题You have an SQL query that takes one minute to execute. You use the following code segment to execute the SQL query asynchronously.IAsyncResult ar = cmd.BeginExecuteReader（ ）;You need to execute a method named Do Work（ ） that takes one second to run while the SQL query is executing. DoWork（ ） must run as many times as possible while the SQL query is executing. Which code segment should you use? （）A
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考题
单选题Statement接口中的execute Query（String sql）方法返回的数据类型是（）A
Statement接口实例B
Connection接口实例C
Database Meta Data类的对象D
Result Set类的对象
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