无论键如何,按值查询postgres jsonb [英] Query postgres jsonb by value regardless of keys
问题描述
我想获取所有记录,其中jsonb字段中的任何 value 均包含文本,而与键无关.
I want to get all records where any value in jsonb field contains a text regardless of key.
例如:字段包含json {k1: 'hello', k2: 'world'}
.我想通过文本"hello"获得此记录.我不在乎键或任何json结构,只在乎值.
For example: field contains json {k1: 'hello', k2: 'world'}
. I want to get this record by the text 'hello'. I don't care about keys or any json structure, only values.
一个肮脏的技巧是将字段强制转换为varchar where jsonb_field::varchar like ...
,但这很丑陋,它将匹配键和{}.
One dirty hack is to cast the field to varchar where jsonb_field::varchar like ...
, but this is ugly and it will match keys and {} as well.
另一个肮脏的骇客看起来像这样:
Another dirty hack looks like this:
SELECT * FROM mytable AS m1 WHERE (
SELECT string_agg(value, '') FROM jsonb_each_text( (SELECT name FROM mytable AS m2 WHERE m1.id= m2.id)::jsonb )
) LIKE '%whatever%';
但这也很丑.
我该怎么做?
推荐答案
对于简单的JSON,您可以使用更合适的查询,例如
For simple JSONs you can use more appropriate query like
select *
from mytable t
where exists (
select 1
from jsonb_each_text(t.jsonbfield) j
where j.value = 'hello');
它对您的示例中的JSON正常工作,但对{"a":"hello","b":1,"c":{"c":"world"}}
It works fine for JSONs like in your example but not helps for more complex JSONs like {"a":"hello","b":1,"c":{"c":"world"}}
我可以建议像这样创建存储功能
I can propose to create the stored function like
create or replace function jsonb_enum_values(in jsonb) returns setof varchar as $$
begin
case jsonb_typeof($1)
when 'object' then
return query select jsonb_enum_values(j.value) from jsonb_each($1) j;
when 'array' then
return query select jsonb_enum_values(a) from jsonb_array_elements($1) as a;
else
return next $1::varchar;
end case;
end
$$ language plpgsql immutable;
列出所有值,包括递归对象(由您决定如何处理数组).
to list all values including recursive objects (It is up to you what to do with arrays).
这是用法示例:
with t(x) as (
values
('{"a":"hello","b":"world","c":1,"d":{"e":"win","f":"amp"}}'::jsonb),
('{"a":"foo","b":"world","c":2}'),
('{"a":[{"b":"win"},{"c":"amp"},"hello"]}'),
('[{"a":"win"}]'),
('["win","amp"]'))
select *
from t
where exists (
select *
from jsonb_enum_values(t.x) j(x)
where j.x = '"win"');
请注意,在字符串值前后用双引号引起来.
Note that doublequotes around the string value.
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