如何从 Postgresql 中的 JSON 对象中获取值并插入到其他一些表中？

Question

{
  "orderId": "s",
  "fulfillerId": "qaqj8fkbmb",
  "orderDetailsUrl": "asd",
  "items": [
    {
      "dTe": "laseIn",
      "itemDescription": "Tetesting",
      "itemId": "item_1",
      "manufacturingUrl": "https://uploads_1.documents.press",
      "skuCode": "1223",
      "productName": "Tesing",
      "quantity": 225,
      "taskId": "task_ID_1"
    },
    {
      "dTe": "laseIn",
      "itemDescription": "Test Sku for Oracle testing",
      "itemId": "item_2",
      "manufacturingUrl": "https://uploads_2.documents.press",
      "skuCode": "123",
      "productName": "Test Sku for Oracle testing",
      "quantity": 225,
      "taskId": "task_ID_2"
    }
  ]
}

实现

-> 获取 orderId/fulfillerId/orderDetailsUrl 的值并对 item 数组对象执行迭代以获取所需值作为其相似对象的数组

-> 存储在变量中

->然后执行插入操作

不知怎的，它不起作用

所需的输出：

项目表

• 项目编号

• fullfillerId

• 订单编号

• sku代码

++ 项目表中 JSON 中的所有剩余数据

物品详情表

• 项目编号

• orderDetailsUrl

• 任务标识

• 数量

我尝试了各种 jsonb 格式，但解析后没有得到准确的输出，我无法从 JSON 中选择值并使用插入查询

Answer 1

这是一个 plpgsql 块，用于说明您如何执行此操作。 raise notice 将替换为相关命令，例如 insert。

do language plpgsql
$$
declare 
j constant json default $json$
{
  "orderId": "s",
  "fulfillerId": "qaqj8fkbmb",
  "orderDetailsUrl": "asd",
  "items": [
    {
      "dTe": "laseIn",
      "itemDescription": "Tetesting",
      "itemId": "item_1",
      "manufacturingUrl": "https://uploads_1.documents.press",
      "skuCode": "1223",
      "productName": "Tesing",
      "quantity": 225,
      "taskId": "task_ID_1"
    },
    {
      "dTe": "laseIn",
      "itemDescription": "Test Sku for Oracle testing",
      "itemId": "item_2",
      "manufacturingUrl": "https://uploads_2.documents.press",
      "skuCode": "123",
      "productName": "Test Sku for Oracle testing",
      "quantity": 225,
      "taskId": "task_ID_2"
    }
  ]
}
$json$;
r record;
begin
    -- Item
    for r in select j->>'fulfillerId' fullfillerid, j->>'orderId' orderid, t->>'itemId' itemid, t->>'skuCode' skucode
     from json_array_elements(j -> 'items') t loop
        raise notice '% % % %', r.fullfillerid, r.orderid, r.itemid, r.skucode;
    end loop;
    --ItemDetails
    for r in select j->>'orderDetailsUrl' orderdetailsurl, t->>'itemId' itemid, t->>'taskId' taskid, (t->>'quantity')::numeric quantity
     from json_array_elements(j -> 'items') t loop
        raise notice '% % % %', r.orderdetailsurl, r.itemid, r.taskid, r.quantity;
    end loop;
end;
$$;

插入会更简单，没有循环：

insert into target_table ( list - of - columns ) 
  select 
    j->>'orderDetailsUrl' orderdetailsurl, 
    t->>'itemId' itemid, 
    t->>'taskId' taskid, 
    (t->>'quantity')::numeric quantity
    -- other expressions maybe
  from json_array_elements(j -> 'items') t;

作为插入item 表和itemietails 表的函数：

create or replace function json_items(raw_data json)
returns void language plpgsql as
$$
begin
 insert into itemdetails(itemid, orderdetailsurl, taskid, quantity) 
  select 
    t->>'itemId', 
    raw_data->>'orderDetailsUrl', 
    t->>'taskId', 
    (t->>'quantity')::numeric
  from json_array_elements(raw_data  -> 'items') t;

 insert into item(itemid, fullfillerid, orderid, skucode, dte, itemdescription)
  select 
    t->>'itemId', 
    raw_data->>'fullfillerId', 
    raw_data->>'orderId', 
    t->>'skuCode',
    t->>'dte',
    t->>'itemDescription'
  from json_array_elements(raw_data  -> 'items') t;
end;
$$;