Search JSONB博士后9.4

我有一个jsonb存储我的订单产品：

CREATE TABLE configuration (
  documentid text PRIMARY KEY
, data jsonb NOT NULL
);

记录：

(1, [{"itemid": "PROD001", "qty": 10}, {"itemid": "PROD002", "qty": 20}]),
(2, [{"itemid": "PROD001", "qty": 5}, {"itemid": "PROD003", "qty": 6}, {"itemid": "PROD004", "qty": 7}]),
(2, [{"itemid": "PROD002", "qty": 8}])

我已经使用GIN索引数据了

我如何：

选择具有PROD001的所有销售

选择具有itemid（如P%1）的所有销售

选择数量大于10的所有销售

获取每个产品的总数量

功能非常清晰，值得您关注。对于您提供的用例，答案可能如下：

-- Answer 1
SELECT sales_item 
FROM configuration,jsonb_array_elements(data) AS sales_item
WHERE sales_item->>'itemid' = 'PROD001'; --  "->>" returns TEXT value
-- Answer 2
SELECT sales_item FROM configuration,jsonb_array_elements(data) AS sales_item
WHERE sales_item->>'itemid' LIKE 'P%1'; -- just use LIKE
-- Answer 3
SELECT sales_item FROM configuration,jsonb_array_elements(data) AS sales_item
WHERE (sales_item->>'qty')::INTEGER > 10; -- convert TEXT to INTEGER

对于最后一个示例，您只需要使用：

示例1、3和

内部查询WHERE子句筛选器行没有任何符合要求的数组元素。而不是jsonb_数组_元素函数。仅适用于“配置”表中所需的行

-- Answer 4 
SELECT DISTINCT documentid,sum((sales_item->>'qty')::INTEGER) 
OVER (PARTITION BY documentid)
FROM configuration,jsonb_array_elements(data) as sales_item;

SELECT * FROM 
    (SELECT jsonb_array_elements(data) as elem FROM configuration
    WHERE data @@ '#.itemid = "PROD001"') q
    WHERE q.elem @@ 'itemid = "PROD001"'

SELECT * FROM 
    (SELECT jsonb_array_elements(data) as elem FROM configuration
    WHERE data @@ '#.qty > 10') q
    WHERE q.elem @@ 'qty > 10'