创建A表，id分别为1，2，3，name分别为a，b，c，MySQL代码实现

可以使用如下的MySQL代码实现：

CREATE TABLE A (
id INT(11) NOT NULL,
name VARCHAR(50) NOT NULL,
PRIMARY KEY (id)
);

INSERT INTO A (id, name) VALUES (1, 'a'), (2, 'b'), (3, 'c');

说明：以上代码创建了一个名为A的表，包含id和name两个字段，其中id作为主键。然后插入了三条数据，分别为id为1、name为a，id为2、name为b和id为3、name为c。

相关问题

使用Java编程和springboot框架,连接mysql数据库（所需的三个表分别为奖品表名为a,活动表名为b,两者关联的表为c（中奖概率字段位于c表））实现下面两个功能 ：1.创建活动并关联奖品，一个活动必须关联8个奖品，总概率为100% 2.修改活动 活动名称不能重复 并更新关联奖品。给出具体程序，包括给出相应的controller层，service层，service实现类，dao层及mapper.xml文件

好的，以下是Java编写的代码示例，包括controller、service、dao和mapper.xml文件。

Controller层：

@RestController
@RequestMapping("/activity")
public class ActivityController {

    @Autowired
    private ActivityService activityService;

    @PostMapping("/create")
    public ResponseEntity createActivity(@RequestBody ActivityDto activityDto) {
        activityService.createActivity(activityDto);
        return ResponseEntity.ok("Create activity success");
    }

    @PutMapping("/update")
    public ResponseEntity updateActivity(@RequestBody ActivityDto activityDto) {
        activityService.updateActivity(activityDto);
        return ResponseEntity.ok("Update activity success");
    }
}

Service层：

public interface ActivityService {

    void createActivity(ActivityDto activityDto);

    void updateActivity(ActivityDto activityDto);
}

Service实现类：

@Service
public class ActivityServiceImpl implements ActivityService {

    @Autowired
    private ActivityMapper activityMapper;

    @Autowired
    private PrizeMapper prizeMapper;

    @Autowired
    private ActivityPrizeMapper activityPrizeMapper;

    @Override
    public void createActivity(ActivityDto activityDto) {
        // 1. 创建活动
        Activity activity = new Activity();
        activity.setName(activityDto.getName());
        activityMapper.insert(activity);

        // 2. 关联奖品
        List<PrizeDto> prizeDtos = activityDto.getPrizes();
        List<ActivityPrize> activityPrizes = new ArrayList<>();
        double totalProbability = 0;
        for (PrizeDto prizeDto : prizeDtos) {
            ActivityPrize activityPrize = new ActivityPrize();
            activityPrize.setActivityId(activity.getId());
            activityPrize.setPrizeId(prizeDto.getId());
            activityPrize.setProbability(prizeDto.getProbability());
            activityPrizes.add(activityPrize);
            totalProbability += prizeDto.getProbability();
        }

        // 3. 校验概率是否为100%
        if (totalProbability != 100) {
            throw new RuntimeException("Total probability must be 100%");
        }

        // 4. 保存关联关系
        activityPrizeMapper.batchInsert(activityPrizes);
    }

    @Override
    public void updateActivity(ActivityDto activityDto) {
        // 1. 查询活动
        Activity activity = activityMapper.selectByPrimaryKey(activityDto.getId());
        if (activity == null) {
            throw new RuntimeException("Activity not exists");
        }

        // 2. 更新活动名称
        if (!activity.getName().equals(activityDto.getName())) {
            Activity activityByName = activityMapper.selectByName(activityDto.getName());
            if (activityByName != null) {
                throw new RuntimeException("Activity name already exists");
            }
            activity.setName(activityDto.getName());
            activityMapper.updateByPrimaryKey(activity);
        }

        // 3. 更新关联奖品
        List<PrizeDto> prizeDtos = activityDto.getPrizes();
        List<ActivityPrize> activityPrizes = new ArrayList<>();
        double totalProbability = 0;
        for (PrizeDto prizeDto : prizeDtos) {
            ActivityPrize activityPrize = new ActivityPrize();
            activityPrize.setActivityId(activity.getId());
            activityPrize.setPrizeId(prizeDto.getId());
            activityPrize.setProbability(prizeDto.getProbability());
            activityPrizes.add(activityPrize);
            totalProbability += prizeDto.getProbability();
        }

        // 4. 校验概率是否为100%
        if (totalProbability != 100) {
            throw new RuntimeException("Total probability must be 100%");
        }

        // 5. 删除旧的关联关系，保存新的关联关系
        activityPrizeMapper.deleteByActivityId(activity.getId());
        activityPrizeMapper.batchInsert(activityPrizes);
    }
}

DAO层：

@Repository
public interface ActivityMapper extends BaseMapper<Activity> {

    Activity selectByName(String name);
}

@Repository
public interface PrizeMapper extends BaseMapper<Prize> {
}

@Repository
public interface ActivityPrizeMapper extends BaseMapper<ActivityPrize> {

    void deleteByActivityId(Integer activityId);

    void batchInsert(List<ActivityPrize> activityPrizes);
}

Mapper.xml文件：

<?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.example.mapper.ActivityMapper">

    <resultMap id="BaseResultMap" type="com.example.entity.Activity">
        <id column="id" jdbcType="INTEGER" property="id" />
        <result column="name" jdbcType="VARCHAR" property="name" />
    </resultMap>

    <select id="selectByPrimaryKey" resultMap="BaseResultMap" parameterType="java.lang.Integer">
        select id, name
        from activity
        where id = #{id,jdbcType=INTEGER}
    </select>

    <select id="selectByName" resultMap="BaseResultMap" parameterType="java.lang.String">
        select id, name
        from activity
        where name = #{name,jdbcType=VARCHAR}
    </select>

    <insert id="insert" parameterType="com.example.entity.Activity">
        insert into activity (name)
        values (#{name,jdbcType=VARCHAR})
    </insert>

    <update id="updateByPrimaryKey" parameterType="com.example.entity.Activity">
        update activity
        set name = #{name,jdbcType=VARCHAR}
        where id = #{id,jdbcType=INTEGER}
    </update>

</mapper>

<?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.example.mapper.PrizeMapper">

    <resultMap id="BaseResultMap" type="com.example.entity.Prize">
        <id column="id" jdbcType="INTEGER" property="id" />
        <result column="name" jdbcType="VARCHAR" property="name" />
    </resultMap>

    <select id="selectByPrimaryKey" resultMap="BaseResultMap" parameterType="java.lang.Integer">
        select id, name
        from prize
        where id = #{id,jdbcType=INTEGER}
    </select>

</mapper>

<?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.example.mapper.ActivityPrizeMapper">

    <resultMap id="BaseResultMap" type="com.example.entity.ActivityPrize">
        <result column="activity_id" jdbcType="INTEGER" property="activityId" />
        <result column="prize_id" jdbcType="INTEGER" property="prizeId" />
        <result column="probability" jdbcType="DOUBLE" property="probability" />
    </resultMap>

    <delete id="deleteByActivityId" parameterType="java.lang.Integer">
        delete from activity_prize
        where activity_id = #{activityId,jdbcType=INTEGER}
    </delete>

    <insert id="insert" parameterType="com.example.entity.ActivityPrize">
        insert into activity_prize (activity_id, prize_id, probability)
        values (#{activityId,jdbcType=INTEGER}, #{prizeId,jdbcType=INTEGER}, #{probability,jdbcType=DOUBLE})
    </insert>

    <insert id="batchInsert">
        <foreach collection="list" item="item" index="index" separator=";">
            insert into activity_prize (activity_id, prize_id, probability)
            values (#{item.activityId,jdbcType=INTEGER}, #{item.prizeId,jdbcType=INTEGER}, #{item.probability,jdbcType=DOUBLE})
        </foreach>
    </insert>

</mapper>

以上是Java编写的实现，使用了SpringBoot和MyBatis框架，其中controller层提供了两个接口，分别用于创建和更新活动，service层提供了对应的接口实现，dao层提供了数据库操作的接口，mapper.xml文件提供了对应的SQL语句。

使用Java编程和springboot框架,连接mysql数据库（奖品表名为a,活动表名为b,两者关联的表为c）实现 1.创建活动并关联奖品，一个活动必须关联8个奖品，总概率为100% 2.修改活动 活动名称不能重复 并更新关联奖品，给出具体程序，包括给出相应的controller层，service层，service实现类，dao层及mapper.xml文件

好的，首先需要创建一个Spring Boot项目，并且添加相关依赖，包括 Spring Boot、MyBatis、MySQL Connector 等。

接下来，我们需要在 MySQL 中创建两个表，分别为 a 和 b，以及一个关联表 c。表结构如下：

-- 奖品表 a
CREATE TABLE `a` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `name` varchar(255) DEFAULT NULL,
  `probability` int(11) NOT NULL DEFAULT '0',
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8mb4;

-- 活动表 b
CREATE TABLE `b` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `name` varchar(255) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8mb4;

-- 关联表 c
CREATE TABLE `c` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `aid` int(11) NOT NULL,
  `bid` int(11) NOT NULL,
  PRIMARY KEY (`id`),
  UNIQUE KEY `idx_aid_bid` (`aid`,`bid`)
) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8mb4;

然后，我们需要定义实体类 Prize 和 Activity，以及它们的关联类 PrizeActivity。

// Prize.java
public class Prize {
    private Integer id;
    private String name;
    private Integer probability;
    // 省略 getter 和 setter
}

// Activity.java
public class Activity {
    private Integer id;
    private String name;
    private List<Prize> prizes;
    // 省略 getter 和 setter
}

// PrizeActivity.java
public class PrizeActivity {
    private Integer id;
    private Integer aid;
    private Integer bid;
    // 省略 getter 和 setter
}

在 DAO 层中，我们需要定义三个接口：PrizeMapper、ActivityMapper 和 PrizeActivityMapper。

// PrizeMapper.java
@Mapper
public interface PrizeMapper {
    @Select("SELECT * FROM a")
    List<Prize> getAllPrizes();
}

// ActivityMapper.java
@Mapper
public interface ActivityMapper {
    @Select("SELECT * FROM b WHERE id = #{id}")
    Activity getActivityById(Integer id);

    @Select("SELECT * FROM b WHERE name = #{name}")
    Activity getActivityByName(String name);

    @Insert("INSERT INTO b (name) VALUES (#{name})")
    @Options(useGeneratedKeys = true, keyProperty = "id")
    int createActivity(Activity activity);

    @Update("UPDATE b SET name = #{name} WHERE id = #{id}")
    void updateActivity(Activity activity);
}

// PrizeActivityMapper.java
@Mapper
public interface PrizeActivityMapper {
    @Insert("INSERT INTO c (aid, bid) VALUES (#{aid}, #{bid})")
    void createPrizeActivity(PrizeActivity prizeActivity);

    @Delete("DELETE FROM c WHERE bid = #{bid}")
    void deletePrizeActivityByActivityId(Integer bid);
}

接下来，我们需要在 Service 层中定义三个接口：PrizeService、ActivityService 和 PrizeActivityService，并且实现它们的方法。

// PrizeService.java
public interface PrizeService {
    List<Prize> getAllPrizes();
}

// ActivityService.java
public interface ActivityService {
    Activity getActivityById(Integer id);

    Activity getActivityByName(String name);

    Activity createActivity(Activity activity);

    void updateActivity(Activity activity);
}

// PrizeActivityService.java
public interface PrizeActivityService {
    void createPrizeActivity(Integer aid, Integer bid);

    void deletePrizeActivityByActivityId(Integer bid);
}

// PrizeServiceImpl.java
@Service
public class PrizeServiceImpl implements PrizeService {
    private final PrizeMapper prizeMapper;

    public PrizeServiceImpl(PrizeMapper prizeMapper) {
        this.prizeMapper = prizeMapper;
    }

    @Override
    public List<Prize> getAllPrizes() {
        return prizeMapper.getAllPrizes();
    }
}

// ActivityServiceImpl.java
@Service
public class ActivityServiceImpl implements ActivityService {
    private final ActivityMapper activityMapper;
    private final PrizeActivityService prizeActivityService;

    public ActivityServiceImpl(ActivityMapper activityMapper, PrizeActivityService prizeActivityService) {
        this.activityMapper = activityMapper;
        this.prizeActivityService = prizeActivityService;
    }

    @Override
    public Activity getActivityById(Integer id) {
        return activityMapper.getActivityById(id);
    }

    @Override
    public Activity getActivityByName(String name) {
        return activityMapper.getActivityByName(name);
    }

    @Override
    public Activity createActivity(Activity activity) {
        activityMapper.createActivity(activity);
        for (Prize prize : activity.getPrizes()) {
            prizeActivityService.createPrizeActivity(prize.getId(), activity.getId());
        }
        return activity;
    }

    @Override
    public void updateActivity(Activity activity) {
        activityMapper.updateActivity(activity);
        prizeActivityService.deletePrizeActivityByActivityId(activity.getId());
        for (Prize prize : activity.getPrizes()) {
            prizeActivityService.createPrizeActivity(prize.getId(), activity.getId());
        }
    }
}

// PrizeActivityServiceImpl.java
@Service
public class PrizeActivityServiceImpl implements PrizeActivityService {
    private final PrizeActivityMapper prizeActivityMapper;

    public PrizeActivityServiceImpl(PrizeActivityMapper prizeActivityMapper) {
        this.prizeActivityMapper = prizeActivityMapper;
    }

    @Override
    public void createPrizeActivity(Integer aid, Integer bid) {
        PrizeActivity prizeActivity = new PrizeActivity();
        prizeActivity.setAid(aid);
        prizeActivity.setBid(bid);
        prizeActivityMapper.createPrizeActivity(prizeActivity);
    }

    @Override
    public void deletePrizeActivityByActivityId(Integer bid) {
        prizeActivityMapper.deletePrizeActivityByActivityId(bid);
    }
}

最后，在 Controller 层中定义 ActivityController，并且注入 ActivityService。

@RestController
@RequestMapping("/activity")
public class ActivityController {
    private final ActivityService activityService;

    public ActivityController(ActivityService activityService) {
        this.activityService = activityService;
    }

    @GetMapping("/{id}")
    public Activity getActivityById(@PathVariable("id") Integer id) {
        return activityService.getActivityById(id);
    }

    @GetMapping("/name/{name}")
    public Activity getActivityByName(@PathVariable("name") String name) {
        return activityService.getActivityByName(name);
    }

    @PostMapping("")
    public Activity createActivity(@RequestBody Activity activity) {
        return activityService.createActivity(activity);
    }

    @PutMapping("/{id}")
    public void updateActivity(@PathVariable("id") Integer id, @RequestBody Activity activity) {
        if (!id.equals(activity.getId())) {
            throw new IllegalArgumentException("The id is not matched.");
        }
        activityService.updateActivity(activity);
    }
}

好了，以上就是实现的全部内容。如果需要更详细的代码实现可以参考：https://github.com/shadowice0904/spring-boot-mybatis-example