SpringBoot整合MybatisPlus3.X之自定义Mapper

Posted 2020-12-01 天宇轩-王

• 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>

   

• 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

   

• Mapper及注入器

  public class CustomizeSuperMapperSqlInjector extends DefaultSqlInjector {
  ?
      /**
       * 如果只需增加方法，保留MP自带方法
       * 可以super.getMethodList() 再add
       * @return
       */
      @Override
      public List<AbstractMethod> getMethodList(Class<?> mapperClass) {
          List<AbstractMethod> methodList = super.getMethodList(mapperClass);
          methodList.add(new FindOne());
          return methodList;
      }
  }
  ?
  public interface MySuperMapper<T> extends Mapper {
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      public T findOne(Object id);
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  }
  ?
  public interface UserMapper extends MySuperMapper<User> {
  ?
  }

• 配置类

  @Configuration
  @MapperScan("com.mp.basemapper.mapper")
  public class MybatisPlusConfig {
  ?
      @Bean
      public CustomizeSuperMapperSqlInjector customizeSuperMapperSqlInjector(){
          return new CustomizeSuperMapperSqlInjector();
      }
  ?
  }

• 实体类

  @Data
  @Accessors(chain = true)
  public class User {
      private Long id;
      private String name;
      private Integer age;
      private String email;
  ?
      private Integer version;
  ?
      private Integer deleted;
  ?
      private Timestamp createTime;
  }

• 方法

  public class FindOne extends AbstractMethod {
  ?
      @Override
      public MappedStatement injectMappedStatement(Class<?> mapperClass, Class<?> modelClass, TableInfo tableInfo) {
          /* 执行 SQL ，动态 SQL 参考类 SqlMethod */
          String sql = "select * from " + tableInfo.getTableName()
                  + " where " + tableInfo.getKeyColumn() + "=#{" + tableInfo.getKeyProperty() + "}";
          /* mapper 接口方法名一致 */
          String method = "findOne";
          SqlSource sqlSource = languageDriver.createSqlSource(configuration, sql, modelClass);
          return addSelectMappedStatementForTable(mapperClass, method, sqlSource, tableInfo);
      }
  }

  ?

• 测试类

  @SpringBootTest
  class BasemapperApplicationTests {
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      @Autowired
      UserMapper userMapper;
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      @Test
      public void test() {
          User user = userMapper.findOne(1L);
          System.out.println(user);
      }
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  }

  ?

• 测试结果

  2019-10-31 11:59:30.159  INFO 828 --- [           main] com.zaxxer.hikari.HikariDataSource       : HikariPool-1 - Start completed.
   Consume Time：4 ms 2019-10-31 11:59:30
   Execute SQL：select * from user where id=1