mybatisplus?复合主键(多主键)?CRUD示例详解

<dependency>
     <groupId>com.github.jeffreyning</groupId>
     <artifactId>mybatisplus-plus</artifactId>
     <version>1.5.1-RELEASE</version>
</dependency>
<dependency>
     <groupId>com.baomidou</groupId>
     <artifactId>mybatis-plus-boot-starter</artifactId>
     <version>3.1.0</version>
 </dependency>
 <dependency>
     <groupId>com.baomidou</groupId>
     <artifactId>mybatis-plus-generator</artifactId>
     <version>3.1.0</version>
 </dependency>

package com.youxue.model.lesson;

import com.baomidou.mybatisplus.annotation.TableField;
import com.baomidou.mybatisplus.annotation.TableName;
import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
import com.fasterxml.jackson.databind.annotation.JsonSerialize;
import com.fasterxml.jackson.datatype.jsr310.deser.LocalDateTimeDeserializer;
import com.fasterxml.jackson.datatype.jsr310.ser.LocalDateTimeSerializer;
import com.github.jeffreyning.mybatisplus.anno.MppMultiId;
import com.youxue.sharding.annotation.TableIndex;
import com.youxue.sharding.annotation.TableIndices;
import com.youxue.sharding.model.BaseShardingPo;
import io.swagger.annotations.ApiModel;
import io.swagger.annotations.ApiModelProperty;
import lombok.Data;
import lombok.EqualsAndHashCode;
import lombok.experimental.Accessors;
import java.io.Serializable;
import java.time.LocalDateTime;
/**
 * <p>
 *     用户观看视频时长
 * <p/>
 *
 * @author dx
 * @since 2021/6/22
 */
@Data
@EqualsAndHashCode(callSuper = false)
@Accessors(chain = true)
@TableName("UserWatchVideoLog")
@ApiModel(value="UserWatchVideoLogPo对象", description="用户观看视频时长表")
@TableIndices({
        @TableIndex(name = "IX_USERID" ,ddl = "CREATE NONCLUSTERED INDEX [IX_USERID] ON UserWatchVideoLog ( [UserId] DESC)" ),
        @TableIndex(name = "IX_LESSONITEMID_USERID" ,ddl = "CREATE NONCLUSTERED INDEX [IX_LESSONITEMID_USERID] ON UserWatchVideoLog (LessonItemId ASC,UserId ASC)" )
})
public class UserWatchVideoLogPo implements Serializable, BaseShardingPo {
    @MppMultiId // 复合主键
    @TableField("userId")
    @ApiModelProperty(value = "用户id")
    private Integer userId;
    @TableField("lessonItemId")
    @ApiModelProperty(value = "子课程id")
    private Integer lessonItemId;
    @ApiModelProperty(value = "观看时长 单位秒（s）")
    @TableField("seconds")
    private Integer seconds;
    @ApiModelProperty(value = "科目id")
    @TableField("subjectId")
    private Integer subjectId;
    @ApiModelProperty(value = "视频观看时长  单位秒（s）")
    @TableField("VideoProgress")
    private Integer videoProgress;
    @ApiModelProperty(value = "视频来源 默认 0 ")
    @TableField("[Resource]")
    private Integer resource;
    @ApiModelProperty(value = "类型  默认 0 ")
    @TableField("[Type]")
    private Integer type;
    @ApiModelProperty(value = "创建时间")
    @TableField("CreateTime")
    @JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss")
    @JsonDeserialize(using = LocalDateTimeDeserializer.class)
    @JsonSerialize(using = LocalDateTimeSerializer.class)
    private LocalDateTime createTime;
    @ApiModelProperty(value = "修改时间")
    @TableField("UpdateTime")
    private LocalDateTime updateTime;
}

package com.youxue.service.lesson;

import com.github.jeffreyning.mybatisplus.service.IMppService;
import com.youxue.model.lesson.UserWatchVideoLogPo;

/**
 * <p>
 * 用户观看视频记录 服务类
 * </p>
 *
 * @author dx
 * @since 2021-06-22
 */
public interface IUserWatchVideoLogService extends IMppService<UserWatchVideoLogPo> {
}

package com.youxue.service.lesson.impl;

import com.github.jeffreyning.mybatisplus.service.MppServiceImpl;
import com.youxue.dao.lesson.UserWatchVideoLogMapper;
import com.youxue.model.lesson.UserWatchVideoLogPo;
import com.youxue.service.lesson.IUserWatchVideoLogService;
import org.springframework.stereotype.Service;

/**
 * <p>
 * 用户观看视频记录 服务类实现类
 * </p>
 *
 * @author dx
 * @since 2021/6/22 
 */
@Service
public class UserWatchVideoLogServiceImpl extends MppServiceImpl<UserWatchVideoLogMapper, UserWatchVideoLogPo> implements IUserWatchVideoLogService {
}

package com.youxue.dao.lesson;

import com.github.jeffreyning.mybatisplus.base.MppBaseMapper;
import com.youxue.model.lesson.UserWatchVideoLogPo;

/**
 * <p>
 * 用户观看视频记录 Mapper 接口
 * </p>
 *
 * @author dx
 * @since 2021-06-22
 */
public interface UserWatchVideoLogMapper extends MppBaseMapper<UserWatchVideoLogPo> {
}

@Autowired
private IUserWatchVideoLogService userWatchVideoLogService;

@Test
public void testUserWatchVideo() {
        UserWatchVideoLogPo userWatchVideoLogPo = new UserWatchVideoLogPo()
                .setUserId(6202238)
                .setLessonItemId(56303)
                .setSeconds(8888)
                .setResource(11);
        boolean create = userWatchVideoLogService.save(userWatchVideoLogPo);
        System.out.println(create);
        System.out.println("create result :" + create);
        System.out.println("================ create end ==================");
		// 断点01
        UserWatchVideoLogPo watchVideoLogPo = userWatchVideoLogService.selectByMultiId(userWatchVideoLogPo);
        System.out.println(watchVideoLogPo.toString());
        System.out.println("================ retrieve end ==================");
        userWatchVideoLogPo.setSeconds(99999);
        userWatchVideoLogPo.setResource(22);
		
        // 断点03        
        boolean upd = userWatchVideoLogService.updateByMultiId(userWatchVideoLogPo);
        System.out.println("upd result :" + upd);
        System.out.println("================ update end ==================");
        // 断点03
        boolean remove = userWatchVideoLogService.deleteByMultiId(userWatchVideoLogPo);
        System.out.println("remove result :" + remove);
        System.out.println("================ remove end ==================");
}