jeecgboot多表联合查询

在数据大屏中需要多表联合查询的业务处理，而Jeecgboot提供的生成工具只能满足最普遍的简单代码，mybatis-plus框架使用的QueryWrapper显然无法满足多表联合查询，需要重写API接口。

1.新建返回对象的实体类

import&nbsp;lombok.Data;
@Data
public class Vendorcount {
    private Integer vendor;
    private Integer material;
}

2.mapper层接口

public interface VendorcountMapper extends BaseMapper<vendorcount> {
    List<vendorcount> pageByVendor();
}

3.xml中写入sql

<select id="pageByVendor" resulttype="org.jeecg.modules.demo.vendorquery.entity.Vendorcount">
        select count(DISTINCT material13.Vendor) as vendor,count(DISTINCT material13.Material) as material
        from material13 INNER JOIN stock on material13.Vendor=stock.create_by and material13.Plant=stock.plant
        and material13.Material=stock.partno
</select>

4.service接口

public&nbsp;interface&nbsp;IVendorcountService&nbsp;extends&nbsp;IService<vendorcount>&nbsp;{
    List<vendorcount> pageByVendorService();
}

5.serviceImpl

@Service
public class VendorcountServiceImpl extends ServiceImpl<vendorcountmapper, vendorcount=""> implements IVendorcountService {
    @Autowired
    private VendorcountMapper vendorcountMapper;

    @Override
    public List<vendorcount> pageByVendorService() {
        return vendorcountMapper.pageByVendor();
    }
}

6.control层

@Api(tags = "供应商查询")
@RestController
@RequestMapping("/Vendorcount/vendorcount")
@Slf4j
public class VendorcountController extends JeecgController<vendorcount, ivendorcountservice=""> {
    @Autowired
&nbsp;&nbsp;&nbsp;&nbsp;private&nbsp;IVendorcountService&nbsp;vendorcountService;
    @AutoLog(value = "供应商查询-统计个数")
    @ApiOperation(value = "供应商查询-统计个数", notes = "供应商查询-统计个数")
    @GetMapping(value = "/list")
    public Result<!--?--> queryVendor(HttpServletRequest req) {
        List<vendorcount> pageList = vendorcountService.pageByVendorService();
        return Result.ok(pageList);
    }
}

7.Shiro配置

// 配置不会被拦截的链接
filterChainDefinitionMap.put("/Vendorcount/vendorcount/**", "anon"); //

8.调试API接口

9.前端定时调用接口刷新数据

getAction("/Vendorcount/vendorcount/list").then((res) => {
    if (res.success) {
      let a = res.result
      this.titleItem[0].number.number = [a[0]["material"]]
      this.titleItem[1].number.number = [a[0]["vendor"]]
      this.titleItem = {
        ...this.titleItem
      }
      this.show = false
      this.$nextTick(() => {
        this.show = true
      })

大屏展示

</vendorcount,></vendorcountmapper,>