MyBatis的parameterType传入参数类型和resultType返回结果类型

野性酷女 2024-04-23 03:14 174阅读 0赞

**记录**：413

**场景**：MyBatis的parameterType传入参数类型和resultType返回结果类型。

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

**1.传入参数parameterType是Integer**

传入参数类型parameterType：java.lang.Integer。

返回结果类型resultType: java.lang.String。

**1.1Mapper接口代码**

@Repository
    public interface CityTypeMapper {
       String getCity01(Integer cityId);
    }

**1.2XML代码**

**2.传入参数parameterType是Long**

传入参数类型parameterType: java.lang.Long。

返回结果类型resultType: java.lang.String。

**2.1Mapper接口代码**

@Repository
    public interface CityTypeMapper {
       String getCity02(Long cityId);
    }

**2.2XML代码**

**3.传入参数parameterType是Double**

传入参数类型parameterType: java.lang.Double。

返回结果类型resultType: java.lang.Double。

**3.1Mapper接口代码**

@Repository
    public interface CityTypeMapper {
       Double getCity03(Double gross);
    }

**3.2XML代码**

**4.传入参数parameterType是String**

传入参数类型parameterType: java.lang.String。

返回结果类型resultType: java.lang.Long。

**4.1Mapper接口代码**

@Repository
    public interface CityTypeMapper {
       Long getCity04(String cityName);
    }

**4.2XML代码**

**5.传入参数parameterType是List<Long>**

传入参数类型parameterType: java.util.ArrayList。

返回结果类型resultType: java.lang.Long。

**5.1Mapper接口代码**

@Repository
    public interface CityTypeMapper {
       long[] getCity05(List<Long> cityIdList);
    }

**5.2XML代码**

**6.传入参数parameterType是Long\[\]**

传入参数类型parameterType: long\[\]。

返回结果类型resultType: java.lang.String。

**6.1Mapper接口代码**

@Repository
    public interface CityTypeMapper {
       List<String> getCity06(Long[] cityIdList);
    }

**6.2XML代码**

**7.传入参数parameterType是Map<String, Object>**

传入参数类型parameterType: java.util.Map。

返回结果类型resultType: com.hub.example.domain.CityPO。

**7.1Mapper接口代码**

@Repository
    public interface CityTypeMapper {
      CityPO getCity07(Map<String, Object> cityMap); 
    }

**7.2XML代码**

<?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.CityTypeMapper">
        <select id="getCity07" parameterType="java.util.Map" resultType="com.hub.example.domain.CityPO">
            select CITY_ID       AS "cityId",
                   CITY_NAME     AS "cityName",
                   LAND_AREA     AS "landArea",
                   POPULATION    AS "population",
                   GROSS         AS "gross",
                   CITY_DESCRIBE AS "cityDescribe",
                   DATA_YEAR     AS "dataYear",
                   UPDATE_TIME   AS "updateTime"
            from t_city
            where CITY_ID = #{cityId}
              AND CITY_NAME = #{cityName}
        </select>   
    </mapper>

**8.传入参数parameterType是CityPO**

传入参数类型parameterType: com.hub.example.domain.CityPO。

返回结果类型resultType: java.util.Map。

**8.1Mapper接口代码**

@Repository
    public interface CityTypeMapper {
       Map<String, Object> getCity08(CityPO cityPO);   
    }

**8.2XML代码**

<?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.CityTypeMapper">
        <select id="getCity08" parameterType="com.hub.example.domain.CityPO" resultType="java.util.Map">
            select CITY_ID       AS "cityId",
                   CITY_NAME     AS "cityName",
                   LAND_AREA     AS "landArea",
                   POPULATION    AS "population",
                   GROSS         AS "gross",
                   CITY_DESCRIBE AS "cityDescribe",
                   DATA_YEAR     AS "dataYear",
                   UPDATE_TIME   AS "updateTime"
            from t_city
            where CITY_ID = #{cityId}
              AND CITY_NAME = #{cityName}
        </select>   
    </mapper>

**9.传入参数parameterType是Date**

传入参数类型parameterType: java.util.Date。

返回结果类型resultType: java.lang.String。

**9.1Mapper接口代码**

@Repository
    public interface CityTypeMapper {
      String getCity09(Date date);
    }

**9.2XML代码**

**10.传入参数parameterType是List<Long>**

传入参数类型parameterType: java.util.ArrayList。

返回结果类型resultType: com.hub.example.domain.CityPO。

**10.1Mapper接口代码**

@Repository
    public interface CityTypeMapper {
      List<CityPO> getCity10(List<Long> paraList);   
    }

**10.2XML代码**

<?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.CityTypeMapper">
        <select id="getCity10" parameterType="java.util.ArrayList" resultType="com.hub.example.domain.CityPO">
            select CITY_ID AS "cityId",
            CITY_NAME AS "cityName",
            LAND_AREA AS "landArea",
            POPULATION AS "population",
            GROSS AS "gross",
            CITY_DESCRIBE AS "cityDescribe",
            DATA_YEAR AS "dataYear",
            UPDATE_TIME AS "updateTime"
            from t_city
            WHERE CITY_ID IN
            <foreach collection="list" item="cityId" open="(" separator="," close=")">
                #{cityId}
            </foreach>
        </select>   
    </mapper>

**11.传入参数parameterType是List<Long>**

传入参数类型parameterType: java.util.ArrayList。

返回结果类型resultType: java.util.Map。

**11.1Mapper接口代码**

@Repository
    public interface CityTypeMapper {
       List<Map<String, Object>> getCity11(List<Long> paraList);
    }

**11.2XML代码**

<?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.CityTypeMapper">
        <select id="getCity11" parameterType="java.util.ArrayList" resultType="java.util.Map">
            select CITY_ID AS "cityId",
            CITY_NAME AS "cityName",
            LAND_AREA AS "landArea",
            POPULATION AS "population",
            GROSS AS "gross",
            CITY_DESCRIBE AS "cityDescribe",
            DATA_YEAR AS "dataYear",
            UPDATE_TIME AS "updateTime"
            from t_city
            WHERE CITY_ID IN
            <foreach collection="list" item="cityId" open="(" separator="," close=")">
                #{cityId}
            </foreach>
        </select>   
    </mapper>

**12.测试代码**

**12.1代码**

@Slf4j
    @RestController
    @RequestMapping("/hub/example/cityType")
    public class CityTypeController {
      @Autowired
      private CityTypeMapper cityTypeMapper;
      @GetMapping("/load01")
      public Object load01() {
        log.info("测试开始...");
        // 1.parameterType: java.lang.Integer; resultType: java.lang.String
        String cityName01 = cityTypeMapper.getCity01(2);
        // 2.parameterType: java.lang.Long; resultType: java.lang.String
        String cityName02 = cityTypeMapper.getCity02(1L);
        // 3.parameterType: java.lang.Double; resultType: java.lang.Double
        double landArea = cityTypeMapper.getCity03(1.81D);
        // 4.parameterType: java.lang.String; resultType: java.lang.Long
        long cityId = cityTypeMapper.getCity04("苏州");
        List<Long> paraList01 = Arrays.asList(1L, 2L);
        // 5.parameterType: java.util.ArrayList; resultType: java.lang.Long
        long[] population = cityTypeMapper.getCity05(paraList01);
        // 6.parameterType: long[]; resultType: java.lang.String
        Long[] paraList02 = new Long[]{1L, 2L};
        List<String> cityNameList = cityTypeMapper.getCity06(paraList02);
        // 7.parameterType: java.util.Map; resultType: com.hub.example.domain.CityPO
        Map<String, Object> map = new HashMap<>();
        map.put("cityId", 3L);
        map.put("cityName", "苏州");
        CityPO cityPO = cityTypeMapper.getCity07(map);
        // 8.parameterType: com.hub.example.domain.CityPO; resultType: java.util.Map
        CityPO cityPO02 = CityPO.builder().cityId(3L).cityName("苏州").build();
        Map<String, Object> map02 = cityTypeMapper.getCity08(cityPO02);
        // 9.parameterType: java.util.Date; resultType: java.lang.String
        Date date = DateUtil.parse("2023-03-10 05:39:16", "yyyy-MM-dd HH:mm:ss");
        String time = cityTypeMapper.getCity09(date);
        // 10.parameterType: java.util.ArrayList; resultType: com.hub.example.domain.CityPO
        List<Long> paraList = Arrays.asList(1L, 2L, 3L);
        List<CityPO> list01 = cityTypeMapper.getCity10(paraList);
        // 11.parameterType: java.util.ArrayList; resultType: java.util.Map
        List<Long> paraList03 = Arrays.asList(1L, 2L, 3L);
        List<Map<String, Object>> list02 = cityTypeMapper.getCity11(paraList03);
        log.info("测试结束...");
    return "执行成功";
      }
    }

**12.2测试请求**

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

**13.基础支撑**

**13.1实体对象**

@Data
    @Builder
    @NoArgsConstructor
    @AllArgsConstructor
    public class CityPO implements Serializable {
      private Long cityId;
      private String cityName;
      private Double landArea;
      private Long population;
      private Double gross;
      private String cityDescribe;
      private String dataYear;
      private Date updateTime;
    }

**13.2建表语句**

CREATE TABLE t_city (
      CITY_ID BIGINT(16) NOT NULL COMMENT '唯一标识',
      CITY_NAME VARCHAR(64) COLLATE utf8_bin NOT NULL COMMENT '城市名',
      LAND_AREA DOUBLE DEFAULT NULL COMMENT '城市面积',
      POPULATION BIGINT(16) DEFAULT NULL COMMENT '城市人口',
      GROSS DOUBLE DEFAULT NULL COMMENT '生产总值',
      CITY_DESCRIBE VARCHAR(512) COLLATE utf8_bin DEFAULT NULL COMMENT '城市描述',
      DATA_YEAR VARCHAR(16) COLLATE utf8_bin DEFAULT NULL COMMENT '数据年份',
      UPDATE_TIME DATETIME DEFAULT NULL COMMENT '更新时间'
    ) ENGINE=INNODB DEFAULT CHARSET=utf8 COLLATE=utf8_bin COMMENT='城市信息表';

**13.3引入MyBatis依赖**

使用mybatis-spring-boot-starter方式引入mybatis，对应mybatis-3.5.9和mybatis-spring-2.0.7核心依赖。

<dependency>
      <groupId>org.mybatis.spring.boot</groupId>
      <artifactId>mybatis-spring-boot-starter</artifactId>
      <version>2.2.2</version>
    </dependency>

以上，感谢。

2023年4月17日