MyBatis-Plus自定义通用的方法实现

public class DefaultSqlInjector extends AbstractSqlInjector {
    @Override
    public List<AbstractMethod> getMethodList() {
        return Stream.of(
            new Insert(),
            new Delete(),
            new DeleteByMap(),
            new DeleteById(),
            new DeleteBatchByIds(),
            new Update(),
            new UpdateById(),
            new SelectById(),
            new SelectBatchByIds(),
            new SelectByMap(),
            new SelectOne(),
            new SelectCount(),
            new SelectMaps(),
            new SelectMapsPage(),
            new SelectObjs(),
            new SelectList(),
            new SelectPage()
        ).collect(toList());
    }
}

public class DeleteAllMethod extends AbstractMethod {
    @Override
    public MappedStatement injectMappedStatement(Class<?> mapperClass, Class<?> modelClass, TableInfo tableInfo) {
        // 自定义sql tableInfo.getTableName() 获取表名
        String sql = "delete from " + tableInfo.getTableName();
        // mapper 接口方法名
        String method = "deleteAll";
        SqlSource sqlSource = languageDriver.createSqlSource(configuration, sql, modelClass);
        return aDDDeleteMappedStatement(mapperClass, method, sqlSource);
    }
}

@Component
public class MysqlInjector extends DefaultSqlInjector {
    @Override
    public List<AbstractMethod> getMethodList() {
        // 这里很重要，先要通过父类方法，获取到原有的集合，不然会自带的通用方法会失效的
        List<AbstractMethod> methodList = super.getMethodList();
        // 添加自定义方法类
        methodList.add(new DeleteAllMethod());
        return methodList;
    }
}

public interface MyMapper<T> extends BaseMapper<T> {
    
    int deleteAll();
}

public interface UserMapper extends MyMapper<User> {
    
    @SqlParser(filter = true)
    int updateByMyWrapper(@Param(Constants.WRAPPER) Wrapper<User> userWrapper, @Param("user") User user);
}

   @Test
    public void delete() {
        int i = userMapper.deleteAll();
        System.out.println(i);
    }