使用postgresql 9.3我可以选择JSON数据类型的特定字段,但如何使用UPDATE修改它们?我在postgresql文档或网上任何地方都找不到这样的例子。我尝试了一些显而易见的方法:
postgres=# create table test (data json);
CREATE TABLE
postgres=# insert into test (data) values ('{"a":1,"b":2}');
INSERT 0 1
postgres=# select data->'a' from test where data->>'b' = '2';
?column?
----------
1
(1 row)
postgres=# update test set data->'a' = to_json(5) where data->>'b' = '2';
ERROR: syntax error at or near "->"
LINE 1: update test set data->'a' = to_json(5) where data->>'b' = '2...
select * from pg_settings where name = 'deadlock_timeout';
begin;
create temp table a2(data jsonb);
insert into a2 values('{
"key0": {
"key01": "2018-05-06T12:36:11.916761+00:00",
"key02": "DEFAULT_WEB_CONFIGURATION",
"key1": {
"key11": "Data System",
"key12": "<p>Health,<p>my address<p>USA",
"key13": "*Please refer to main screen labeling"
}
}}'::jsonb);
commit;
嵌套的jsonb结构更新。可应用于删除。
update a2 set data =
data::jsonb #- '{key0, key1, key13}'
|| '{"key13":"screen labeling"}'::jsonb
returning *;
你觉得这个解决办法怎么样?
它将添加新值或更新现有值。
编辑:编辑后使其与null和空对象一起工作
Edit2:编辑使它与对象中的对象一起工作…
create or replace function updateJsonb(object1 json, object2 json)
returns jsonb
language plpgsql
as
$$
declare
result jsonb;
tempObj1 text;
tempObj2 text;
begin
tempObj1 = substr(object1::text, 2, length(object1::text) - 2); --remove the first { and last }
tempObj2 = substr(object2::text, 2, length(object2::text) - 2); --remove the first { and last }
IF object1::text != '{}' and object1::text != 'null' and object1::text != '[]' THEN
result = ('{' || tempObj1 || ',' || tempObj2 || '}')::jsonb;
ELSE
result = ('{' || tempObj2 || '}')::jsonb;
END IF;
return result;
end;
$$;
用法:
update table_name
set data = updatejsonb(data, '{"test": "ok"}'::json)