mybatis使用注解插入数据，并获取插入后的id

@SelectKey获取插入数据后的主键id.

• keyColumn：主键列名
• keyProperty:主键在java类的属性名
• before:获取id是插入前，还是插入后，一般取值:false
• resultType:返回类型 一般取值：Integer.class
• statement: 定义sql语句，获取插入数据后的主键

@Mapper
public interface UserMapper {
@SelectKey(keyColumn = "id",keyProperty = "id",before = false,
statement = {"select last_insert_id()"},resultType = Integer.class)
@Insert("insert into user(username,birthday,user_sex,user_address) 
		values(#{username},#{birthday},#{userSex},#{userAddress})")
int insetUser(User user);
}