如何在postgres中查询嵌套数组JSON？

Question

我有一个JSON文档的结构存储在我的一个POSTGRES表中

link to the sample JSON is here

在这个JSON中，我在嵌套数组中有下面的结构，

"product_order_reference": {
                            "purchase_order_number": "0007-8653547-0590"
                        }

我正在尝试检索JSON，其中包含提供的采购订单编号，我尝试了以下查询，即使它们是该采购订单编号的JSON行，查询也没有返回

我试过的查询：

SELECT * from edi_records , jsonb_array_elements(valid_record :: jsonb ->'loop_id_hls') hls,jsonb_array_elements(hls->'loop_id_hlo') hlo where hlo->'product_order_reference' ->> 'purchase_order_number' = '0007-8653547-0590';


SELECT * from edi_records , jsonb_array_elements(valid_record :: jsonb ->'loop_id_hls') hls,jsonb_array_elements(hls->'loop_id_hlo') hlo where hlo ->> 'purchase_order_number' = '0007-8653547-0590';


SELECT * from edi_records , jsonb_array_elements(valid_record :: jsonb ->'advance_shipment_notice'::text->'loop_id_hls') hls,jsonb_array_elements(hls->'loop_id_hlo') hlo where hlo ->> 'purchase_order_number' = '0007-8653547-0590';



SELECT track_num from edi_records , jsonb_array_elements(valid_record :: jsonb ->'advance_shipment_notice'->'loop_id_hls') hls,jsonb_array_elements(hls->'loop_id_hlo') hlo where hlo -> 'product_order_reference'->> 'purchase_order_number' ::text = '0007-8653547-0590';

任何人都可以帮我解决这个问题，我被困在这里。

Answer 1

我复制并粘贴了您的JSON对象。它有点大，但我能得到订单号。主要的麻烦是所有嵌套数组。

缺点是我正在手动挖掘json对象。如果结构发生变化或者如果键包含需要稍微搜索的重复对象，则结果将是错误的。我相信这可以改进。

SELECT
  your_json -> 'advance_shipment_notice'
    -> 'loop_id_hls'
    -> 0 -- {loop_id_hls}
    -> 'loop_id_hlo'
    -> 0 -- {loop_id_hlo}
    -> 'product_order_reference'
    -> 'purchase_order_number' AS purchase_order_number
FROM your_json;