POSTGRESQL：如何查询嵌套的 JSONB 对象以获取过滤后的 JSONB 对象？

Question

输入JSON

{
"orderId": "order1",
"fulfillerId":"ful1",
"orderDetailsUrl":"het",
"items":[{
        "decorationTechnology":"laserEngraving",
        "itemId":"item1",
        "productName":"Test Sku for Oracle testing"
    },
    {
        "decorationTechnology":"laserEngraving",
        "itemId":"item2",
        "productName":"Test Sku for Oracle testing"
    }
  ]
}

预期输出 JSON

{
   "fulfillerIds":[
      "ful1"
   ],
   "orderIds":[
      "order1"
   ],
   "itemIds":[
       "item1",
        "item2"
   ]
}

需要形成高于预期的 JSON 尝试使用 row_to_json() 和 jsonb_array_elements() 但无法获得预期的输出

Answer 1

如果您使用的是 Postgres 12 或更高版本，则可以使用 SQL/JSON 路径查询：

select jsonb_build_object(
         'orderIds', jsonb_path_query_array(the_column, '$.orderId'), 
         'fulfillerIds', jsonb_path_query_array(the_column, '$.fulfillerId'),
         'itemIds', jsonb_path_query_array(the_column, '$.items[*].itemId')
       ) as filtered
from the_table;

Answer 2

在早期版本中，它适用于串联和构建数组：

WITH t1 AS
    (
        SELECT '{ "orderId": "order1", "fulfillerId":"ful1", "orderDetailsUrl":"het", "items":[{ "decorationTechnology":"laserEngraving", "itemId":"item1", "productName":"Test Sku for Oracle testing" }, { "decorationTechnology":"laserEngraving", "itemId":"item2", "productName":"Test Sku for Oracle testing" } ] } '::jsonb AS field
    )
SELECT jsonb_build_object('orderId', json_build_array (field->>'orderId')) || jsonb_build_object('fulfillerId', json_build_array (field->>'fulfillerId')) || jsonb_build_object('orderDetailsUrl', json_build_array (field->>'orderDetailsUrl')) AS jsonb_result
FROM t1
;