PostgreSQL：获取jsonb数组内部对象的值以进行全文搜索

Question

如何基于作为数组一部分的对象中的某个键获取某个值？我存储我的Postgres里面的json数据jsonb 9.6 DB

addresses (JSONB) 
--------- 
[{"address":"abc@def.com", "type": "home"}, {"address":"xyz@def.com", "type": "work"}] 

我很想做的是一样的东西：

SELECT addresses ->> 'address' FROM foo 

，然后使用结果的全文检索，我在那里搜索就像一个特定的电子邮件地址：

SELECT * FROM foo WHERE 
to_tsvector('simple', CAST(addresses ->>'address' as text)) @@ to_tsquery('abc:*'); 

我得到的，当我运行的第一个查询是：(NULL)

Answer 1

你应该unnest json阵列使用jsonb_array_elements():

with foo(addresses) as (
values 
    ('[{"address":"abc@def.com", "type": "home"}, {"address":"xyz@def.com", "type": "work"}]'::jsonb) 
) 

select value->>'address' as address 
from foo, 
jsonb_array_elements(addresses) 
where to_tsvector('simple', value->>'address') @@ to_tsquery('abc:*'); 

    address 
------------- 
abc@def.com 
(1 row)