SpringBoot整合MybatisPlus3.X之SQL注入器(九)

• 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

• 实体类

  @Data
  @TableName(value = "student")
  public class Student {
  ​
      private Long id;
  ​
      private String name;
  ​
      private Integer age;
  ​
  }
  ​
  @Mapper
  public interface StudentMapper extends BaseMapper<Student> {
  ​
      void deleteAll();
  ​
  }

• 注入器及方法

  public class DeleteAll extends AbstractMethod {
  ​
      @Override
      public MappedStatement injectMappedStatement(Class<?> mapperClass, Class<?> modelClass, TableInfo tableInfo) {
          /* 执行 SQL ，动态 SQL 参考类 SqlMethod */
          String sql = "delete from " + tableInfo.getTableName();
          /* mapper 接口方法名一致 */
          String method = "deleteAll";
          SqlSource sqlSource = languageDriver.createSqlSource(configuration, sql, modelClass);
          return this.addDeleteMappedStatement(mapperClass, method, sqlSource);
      }
  }
  ​
  @Component
  public class MySqlInjector extends DefaultSqlInjector {
  ​
      @Override
      public List<AbstractMethod> getMethodList(Class<?> mapperClass) {
          List<AbstractMethod> methodList = super.getMethodList(mapperClass);
          //增加自定义方法
          methodList.add(new DeleteAll());
          return methodList;
      }
  }

• 测试类

  @SpringBootTest
  class InjectorApplicationTests {
  ​
      @Autowired(required = false)
      private StudentMapper studentMapper;
  ​
      @Test
      public void test(){
          studentMapper.deleteAll();
      }
  ​
  }

• 测试结果

  2019-10-31 10:40:22.780  INFO 9484 --- [           main] com.zaxxer.hikari.HikariDataSource       : HikariPool-1 - Start completed.
   Consume Time：0 ms 2019-10-31 10:40:22
   Execute SQL：delete from student

  ​