mybatis中数组和List使用下标取值以及传入多个参数时取值

记录：416

场景：在mybatis中接口的入参是数组和List时，使用下标从数组和List取值。接口的入参有多个参数时取值，以及注解@Param使用。

版本：JDK 1.8,Spring Boot 2.6.3,mybatis-3.5.9。

1.入参是数组时使用下标取值

入参是数组时使用下标取值，和Java代码中数组使用下标取值一样。

1.1Mapper接口

@Repository
public interface GetValueByIndexMapper {
  int insertCityByArray(long[] cityInfo);
}

1.2Mapper.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.hub.example.mapper.GetValueByIndexMapper">
  <insert id="insertCityByArray" parameterType="long[]">
      INSERT INTO t_city_index(CITY_ID, POPULATION, GROSS)
      VALUES (#{cityInfo[0]}, #{cityInfo[1]}, #{cityInfo[2]})
  </insert>
</mapper>

2.入参是List时使用下标取值

入参是数组时使用下标取值，和Java代码中数组使用下标取值一样。

2.1Mapper接口

public interface GetValueByIndexMapper {
  int insertCityByList(List<Long> cityInfo);
}

2.2Mapper.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.hub.example.mapper.GetValueByIndexMapper">
  <insert id="insertCityByList" parameterType="java.util.List">
      INSERT INTO t_city_index(CITY_ID, POPULATION, GROSS)
      VALUES (#{cityInfo[0]}, #{cityInfo[1]}, #{cityInfo[2]})
  </insert>
</mapper>

3.入参有多个参数时取值

入参有多个参数时取值，第一个参数时一个实体类，第二个参数时一个基本类型。使用@Param注解在接口的方法上指定MyBatis在XML中取值的参数名称。

3.1Mapper接口

public interface GetValueByIndexMapper {
  int insertCityMultipleArgs(@Param("cityArgs") CityArgs cityArgs, @Param("gross") long gross);
}

3.2Mapper.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.hub.example.mapper.GetValueByIndexMapper">
  <insert id="insertCityMultipleArgs">
      INSERT INTO t_city_index(CITY_ID, POPULATION, GROSS)
      VALUES (#{cityArgs.cityId}, #{cityArgs.population}, #{gross})
  </insert>
</mapper>

4.测试

4.1测试代码

@Slf4j
@RestController
@RequestMapping("/hub/example/cityIndex")
public class GetValueByIndexController {
  @Autowired
  private GetValueByIndexMapper getValueByIndexMapper;
  @GetMapping("/load01")
  public Object load01() {
    log.info("测试开始...");
    long[] paraList01 = new long[]{1L, 2L, 3L};
    getValueByIndexMapper.insertCityByArray(paraList01);
    List<Long> paraList02 = Arrays.asList(11L, 12L, 12L);
    getValueByIndexMapper.insertCityByList(paraList02);
    log.info("测试结束...");
    return "执行成功";
  }
  @GetMapping("/load02")
  public Object load02() {
    log.info("测试开始...");
    long[] paraList01 = new long[]{1L, 2L, 3L};
    CityArgs cityArgs = CityArgs.builder().cityId(111L).population(222L).build();
    long gross = 333L;
    getValueByIndexMapper.insertCityMultipleArgs(cityArgs,gross);
    log.info("测试结束...");
    return "执行成功";
  }
}

4.2测试URL

URL01：http://127.0.0.1:18080/hub-example/hub/example/cityIndex/load01

URL02：http://127.0.0.1:18080/hub-example/hub/example/cityIndex/load02

5.辅助

5.1实体对象

@Data
@Builder
@NoArgsConstructor
@AllArgsConstructor
public class CityArgs {
    private Long cityId;
    private Long population;
}

5.2建表语句

CREATE TABLE t_city_index (
  CITY_ID BIGINT(16) NOT NULL COMMENT '唯一标识',
  POPULATION BIGINT(16) DEFAULT NULL COMMENT '城市人口',
  GROSS BIGINT(20) DEFAULT NULL COMMENT '生产总值'
) ENGINE=INNODB DEFAULT CHARSET=utf8 COLLATE=utf8_bin COMMENT='城市信息表';

以上，感谢。

2023年4月18日

mybatis中数组和List使用下标取值以及传入多个参数时取值

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