SpringBoot与MybatisPlus整合之活动记录(十五)

活动记录和正常的CRUD效果是一样的，此处只当一个拓展，了解即可

• pom.xml

  <dependencies>
          <dependency>
              <groupId>org.springframework.boot</groupId>
              <artifactId>spring-boot-starter</artifactId>
          </dependency>
          <dependency>
              <groupId>com.baomidou</groupId>
              <artifactId>mybatis-plus-boot-starter</artifactId>
              <version>3.2.0</version>
          </dependency>
          <dependency>
              <groupId>org.projectlombok</groupId>
              <artifactId>lombok</artifactId>
          </dependency>
          <!-- https://mvnrepository.com/artifact/p6spy/p6spy -->
          <dependency>
              <groupId>p6spy</groupId>
              <artifactId>p6spy</artifactId>
              <version>3.8.0</version>
          </dependency>
          <dependency>
              <groupId>com.h2database</groupId>
              <artifactId>h2</artifactId>
              <scope>runtime</scope>
          </dependency>
  ​
          <dependency>
              <groupId>com.alibaba</groupId>
              <artifactId>fastjson</artifactId>
              <version>1.2.49</version>
              <scope>test</scope>
          </dependency>
          <!-- for testing -->
          <dependency>
              <groupId>org.springframework.boot</groupId>
              <artifactId>spring-boot-starter-test</artifactId>
              <scope>test</scope>
          </dependency>
      </dependencies>

• 配置类

  @Configuration
  @MapperScan("com.mp.record.mapper")
  public class MybatisPlusConfig {
  ​
  }

• 实体类

  @EqualsAndHashCode(callSuper = true)
  @Data
  @Accessors(chain = true)
  public class User extends Model<User> {
      private Long id;
      private String name;
      private Integer age;
      private String email;
  ​
      @Override
      protected Serializable pkVal() {
          /**
           * AR 模式这个必须有，否则 xxById 的方法都将失效！
           * 另外 UserMapper 也必须 AR 依赖该层注入，有可无 XML
           */
          return id;
      }
  }

  ​

• Mapper层

  /**
   * <p>
   * 这个得有，就算不去用它否则默认不注入
   * </p>
   * <p>
   * MP 支持不需要 UserMapper.xml 这个模块演示内置 CRUD 咱们就不要 XML 部分了
   * </p>
   *
   */
  public interface UserMapper extends BaseMapper<User> {
  ​
  }

• application.yml

  spring:
    datasource:
      driver-class-name: com.p6spy.engine.spy.P6SpyDriver
      url: jdbc:p6spy:h2:tcp://192.168.180.115:19200/~/mem/test
      username: root
      password: test

• 测试类

  @SpringBootTest
  class RecordApplicationTests {
  ​
      @Test
      public void aInsert() {
          User user = new User();
          user.setName("咩咩");
          user.setAge(5);
          user.setEmail("miemie@mp.com");
          //INSERT INTO user ( id, name, email, age ) VALUES ( 1190527412941651970, '咩咩', 'miemie@mp.com', 5 )
          Assert.assertTrue(user.insert());
          // 成功直接拿会写的 ID
          System.err.println("
  插入成功 ID 为：" + user.getId());
      }
  ​
  ​
      @Test
      public void bDelete() {
          Assert.assertTrue(new User().setId(3L).deleteById());
          Assert.assertTrue(new User().delete(new QueryWrapper<User>()
                  .lambda().eq(User::getName, "Sandy")));
      }
  ​
  ​
      @Test
      public void cUpdate() {
          Assert.assertTrue(new User().setId(1L).setEmail("ab@c.c").updateById());
          Assert.assertTrue(new User().update(new UpdateWrapper<User>().lambda()
                  .set(User::getAge, 3).eq(User::getId, 2)));
      }
  ​
  ​
      @Test
      public void dSelect() {
          Assert.assertEquals("ab@c.c", new User().setId(1L).selectById().getEmail());
          User user = new User().selectOne(new QueryWrapper<User>().lambda().eq(User::getId, 2));
          Assert.assertEquals("Jack", user.getName());
          Assert.assertTrue(3 == user.getAge());
      }
  ​
  }

•