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单项选择题

以下有关MyBatis映射文件中元素说法正确的是。(  ) A.
元素用于映射插入语句,在执行完元素中定义的SQL语句后,没有返回结果。 B.
元素的属性与元素的属性相同。 C.
keyColumn属性用于设置第几列是主键,当主键列不是表中的第一列时需要设置 D.
useGeneratedKeys(仅对insert有用)此属性会使MyBatis使用JDBC的getGeneratedKeys()

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