JSON 中的 PostgreSQL 多级搜索答案

【问题标题】：PostgreSQL multilevel search in JSONJSON 中的 PostgreSQL 多级搜索
【发布时间】：2018-05-11 08:57:08
【问题描述】：

问题是如何在 PostgreSQL 的多级 JSON 列中搜索（使用LIKE 语句）。

我想通过name 进行搜索，它位于en 或任何其他列支持的语言中。

表：

places
-------

id                     ascii_name                    translations

dsrsfdsf               be-namor		    { "en":{"locale":"en","name":"Namur"},"de":{"locale":"de","name":"Namur"},"bg":{"locale":"bg","name":"Намюр"} }
s3drs2es	       be-mouscron          { "en":{"locale":"en","name":"Mouscron"},"pl":{"locale":"pl","name":"Mouscron"},"de":{"locale":"de","name":"Mouscron"} }

我刚刚找到了一种使用json_object_keys的方法，但是它会导致我无法在WHERE语句中使用set-returning函数的错误。

SELECT * FROM places p WHERE p.translations->json_object_keys(p.translations)->'name' LIKE '%Namur%'

错误：

[0A000] 错误：WHERE 中不允许设置返回函数

提前谢谢你！

【问题讨论】：

标签： json postgresql multi-level

【解决方案1】：

so=# with c(j) as (values
 ('{ "en":{"locale":"en","name":"Namur"},"de":{"locale":"de","name":"Namur"},"bg":{"locale":"bg","name":"Намюр"} }'::json)
,('{ "en":{"locale":"en","name":"Mouscron"},"pl":{"locale":"pl","name":"Mouscron"},"de":{"locale":"de","name":"Mouscron"} }')
)
, filter as (select j,j->json_object_keys(j)->>'name' like '%amur%' as "found" from c)
select distinct j::jsonb from filter where found;
                                                              j
-----------------------------------------------------------------------------------------------------------------------------
 {"bg": {"name": "Намюр", "locale": "bg"}, "de": {"name": "Namur", "locale": "de"}, "en": {"name": "Namur", "locale": "en"}}
(1 row)

请注意，我将 json 转换为 jsonb 以过滤掉骗子

【讨论】：