在 postgresql 原始查询中更新对象的 json 列数组中的值

Question

I have a json type column in postgreSQL and I want to update the specific field in that json column. Below is the column I want to update in, [{"id":"xyyc","answered":false,"payable":true,"productIncentiveCost":{"incentive":0,"cost":0,"dollarIncentive":0,"dollarCost":0},"reward":0,"amountInDollar":0,"delayToNextProduct":"","extraDelayToNextProduct":""}] .

I want to update the "reward" at 0 index of this column using postgreSQL raw query.

I have tried updating it using update method set and set_json but no luck.

Answer 1

update data
set value = tmp.upd_json_arr
from (
  select 
      jsonb_agg(jsonb_row || '{"reward": 167}') as upd_json_arr
  from data,
      jsonb_array_elements(value) jsonb_row
) tmp;

Details:

• First, you need to 'expand' your jsonb array using jsonb_array_elements() function. As a result you'll get jsonb rows.
• Then, using concatenation operation you can rewrite a jsonb field: jsonb_row || '{"reward": 167}' jsonb_row || '{"reward": 167}' .
• Finally, jsonb_agg() function can help you to flatten all the jsonb rows into an array upd_json_arr .
• upd_json_arr is used in a set -statement.

Here is the demo .

This answer shows different ways to manipulate with jsonb fields.