Question

我是后端开发中的新手，并且坚持一个简单的请求并寻求帮助。我正在尝试进行简单的加入：

select * from product a, product_barcode b
 where a.productid = b.productid

课程结构：

产品

class Product extends ManagedObject<product> implements product {}

class product {
  @primaryKey
  int productid;

  String rusname;
  String engname;

  ManagedSet<Product_barcode> products;
}

产品条形码

Class Product_barcode extends ManagedObject<product_barcode>
    implements product_barcode {}

class product_barcode {
  @primaryKey
  int productid;

  String barcode;

  @Relate(#products)
  Product product;
}

请求

  @Operation.get()
  Future<Response> getProducts() async {
    final productQuery = Query<Product>(context)..join(set: (a) => a.products);
    final res = await productQuery.fetch();

    return Response.ok(res);
  }

我提出请求时遇到错误：

SELECT t0.productid,t0.rusname,t0.engname,t1.productid,t1.barcode,t1.product_productid FROM product t0 LEFT OUTER JOIN product_barcode t1 ON t0.productid=t1.product_productid
column t1.product_productid does not exist

我做错了什么？我的数据库中没有列 product_productid

更新表格结构

drugs=# \dt product_barcode
              List of relations
 Schema |      Name       | Type  |  Owner
--------+-----------------+-------+----------
 public | product_barcode | table | druguser
(1 row)


drugs=# \d product_barcode
                 Table "public.product_barcode"
  Column   |       Type        | Collation | Nullable | Default
-----------+-------------------+-----------+----------+---------
 productid | integer           |           | not null |
 barcode   | character varying |           | not null |
Indexes:
    "product_barcode_pk" PRIMARY KEY, btree (productid, barcode)

drugs=# \dt product
          List of relations
 Schema |  Name   | Type  |  Owner
--------+---------+-------+----------
 public | product | table | druguser
(1 row)


drugs=# \d product
                      Table "public.product"
         Column          |  Type  | Collation | Nullable | Default
-------------------------+--------+-----------+----------+---------
 productid               | bigint |           | not null |
 rusname                 | text   |           |          |
 engname                 | text   |           |          |
 registrationdate        | text   |           |          |
 dateofcloseregistration | text   |           |          |
 registrationnumber      | text   |           |          |
 composition             | text   |           |          |
 zipinfo                 | text   |           |          |
 producttypecode         | text   |           |          |
 marketstatusid          | text   |           |          |
Indexes:
    "product_pkey" PRIMARY KEY, btree (productid)

简单加入渡槽

0 个答案: