mybatis插入数据后返回自增主键ID的两种实现方式

@Override
        @Insert(" INSERT INTO `air_quality_index` (`districtId`, `monitorTime`, `Pm10`,`Pm25`,`monitoringStation`) VALUES (#{districtId}, NOW(), #{Pm10},#{Pm25},#{monitoringStation}))
@SelectKey(statement="select currval('air_quality_index_id_seq')"),keyProperty = "id",before=false,resultType = Long.class)
int insert(User user);

@SelectKey(statement="select currval('air_quality_index_id_seq')"),keyProperty = "id",before=false,resultType = Long.class)

result = getBaseMapper().insert(user);

@SelectKey(statement="select LAST_INSERT_ID()",keyProperty = "id",before = false,resultType = Long.class)

<insert id="insertUser" useGeneratedKeys="true" keyProperty="id"> 
@Insert(" INSERT INTO `air_quality_index` (`districtId`, `monitorTime`, `Pm10`,`Pm25`,`monitoringStation`) VALUES (#{districtId}, NOW(), #{Pm10},#{Pm25},#{monitoringStation}))
</insert>

CREATE TABLE `sys_user` (
  `id` int(11) NOT NULL AUTO_INCREMENT COMMENT '用户id',
  `user_name` varchar(64) DEFAULT NULL COMMENT '用户名',
  `password` varchar(64) DEFAULT NULL COMMENT '密码',
  `email` varchar(100) DEFAULT NULL COMMENT '邮箱',
  `info` text COMMENT '简介',
  `create_time` datetime DEFAULT NULL COMMENT '创建时间',
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COMMENT='用户表';

<insert id="insert1" useGeneratedKeys="true" keyProperty="id">
        insert into sys_user(user_name,password,email,info,create_time)
        values(#{userName},#{password},#{email},#{info},#{createTime})
    </insert>

<insert id="insert2">
        insert into sys_user(user_name,password,email,info,create_time)
        values(#{userName},#{password},#{email},#{info},#{createTime})
        <selectKey keyColumn="id" resultType="int" keyProperty="id" order="AFTER">
            SELECT LAST_INSERT_ID()
        </selectKey>
    </insert>

@Insert("insert into sys_user(user_name,password,email,info,create_time)"
            +"values(#{userName},#{password},#{email},#{info},#{createTime})")
    @Options(keyColumn="id",keyProperty="id",useGeneratedKeys=true)
    int insert(SysUser user);

@Insert("insert into sys_user(user_name,password,email,info,create_time)"
            +"values(#{userName},#{password},#{email},#{info},#{createTime})")
    @SelectKey(statement="SELECT LAST_INSERT_ID()",
               keyProperty="id",
               resultType=Integer.class,
               before = false)
    int insert(SysUser user);