Question

MyTable的


id |  data
___________
1  |[{"Session1": "", "DeviceId1": ""}, {"Session2": "", "DeviceId2": ""}]

我想要更新数据并将Session1设置为等于xxx而DevicceId1等于yyy

我写了这个查询，但这没效果

update MyTable data=jsonb_set(data, '{Session1}', 'xxx',true)

如何在PostgreSQL中更新json数组的值？

Answer 1

您可以使用json数组索引（从0开始）作为路径：

update my_table
set data = jsonb_set(data, '{0}', '{"Session1": "xxx", "DeviceId1": "yyy"}')
where id = 1
returning *;

 id |                                     data                                     
----+------------------------------------------------------------------------------
  1 | [{"Session1": "xxx", "DeviceId1": "yyy"}, {"Session2": "", "DeviceId2": ""}]
(1 row)

Answer 2

data是一个json数组，因此Session1的路径必须为{0,Session1}，类似{0,DeviceId1} DeviceId1

哪个会生成更新声明：

UPDATE "MyTable"
SET "data" = jsonb_set(jsonb_set(data, '{0,Session1}', '"xxx"', true), '{0,DeviceId1}', '"yyy"', true)
WHERE id = 1

更新数组json的数据

2 个答案: