如何自定义SQL(Mapper)语句

场景描述

在实际业务场景中,存在复杂SQL的情况,具体表现为:

  • 单表单SQL满足不了的情况下
  • 有复杂的Join关系或者子查询
  • 复杂SQL的逻辑通过程序逻辑难以实现或实现代价较大

在此情况下,通过原生的mybatis/mybatis-plus, 自定义Mapper的方式实现业务功能

1、编写所需的Mapper

SQL Mapper写法无限制,与使用原生的mybaits/mybaits-plus用法一样; Mapper(DAO)和SQL可以写在一个文件中,也分开写在两个文件中。

package pro.shushi.pamirs.demo.core.map;

import org.apache.ibatis.annotations.Mapper;
import org.apache.ibatis.annotations.Param;
import org.apache.ibatis.annotations.Select;

import java.util.List;
import java.util.Map;

@Mapper
public interface DemoItemMapper {
    @Select("<script>select sum(item_price) as itemPrice,sum(inventory_quantity) as inventoryQuantity,categoryId from ${demoItemTable}  as core_demo_item ${where}  group by category_id</script>")
    List<Map<String, Object>> groupByCategoryId(@Param("demoItemTable") String pamirsUserTable, @Param("where") String where);
}

2.调用mapper

调用Mapper代码示例

package pro.shushi.pamirs.demo.core.map;

import com.google.api.client.util.Lists;
import org.springframework.stereotype.Component;
import pro.shushi.pamirs.demo.api.model.DemoItem;
import pro.shushi.pamirs.framework.connectors.data.api.datasource.DsHintApi;
import pro.shushi.pamirs.meta.api.core.orm.convert.DataConverter;
import pro.shushi.pamirs.meta.api.session.PamirsSession;
import pro.shushi.pamirs.meta.common.spring.BeanDefinitionUtils;

import java.util.List;
import java.util.Map;

@Component
public class DemoItemDAO {
    public List<DemoItem> customSqlDemoItem(){
        try (DsHintApi dsHint = DsHintApi.model(DemoItem.MODEL_MODEL)) {
            String demoItemTable = PamirsSession.getContext().getModelCache().get(DemoItem.MODEL_MODEL).getTable();

            DemoItemMapper demoItemMapper = BeanDefinitionUtils.getBean(DemoItemMapper.class);
            String where = " where status = 'ACTIVE'";
            List<Map<String, Object>> dataList = demoItemMapper.groupByCategoryId(demoItemTable,where);
            DataConverter persistenceDataConverter = BeanDefinitionUtils.getBean(DataConverter.class);
            return persistenceDataConverter.out(DemoItem.MODEL_MODEL, dataList);
        }
        return Lists.newArrayList();
    }
}

调用Mapper一些说明

  • 启动类需要配置扫描包MapperScan
    @MapperScan(value = "pro.shushi", annotationClass = Mapper.class)
    @SpringBootApplication(exclude = {DataSourceAutoConfiguration.class, FreeMarkerAutoConfiguration.class})
    public class DemoApplication {
  • 调用Mapper接口的时候,需要指定数据源;即上述示例代码中的 DsHintApi dsHint = DsHintApi.model(DemoItem.MODEL_MODEL), 实际代码中使用 try-with-resources语法。
  • 从Mapper返回的结果中获取数据
    • 如果SQL Mapper中已定义了resultMap,调用Mapper(DAO)返回的就是Java对象
    • 如果Mapper返回的是Map<String, Object>,则通过 DataConverter.out进行转化,参考上面的示例

其他参考:Oinone连接外部数据源方案:https://doc.oinone.top/backend/4562.html

Oinone社区 作者:数式-海波原创文章,如若转载,请注明出处:https://doc.oinone.top/backend/4759.html

访问Oinone官网:https://www.oinone.top获取数式Oinone低代码应用平台体验

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