Question

我有一个jsonb字段（让我们称之为＆＃34; info＆＃34;）具有这样的价值

{"a": "foo", "c": "{ \"d\": \"dog\"}", \"b\": \"bark\"}

使用Postgres如何删除反斜杠？我尝试使用

REPLACE(info::text, '\', '')

或者这个 REGEXP_REPLACE（info :: text，＆＃39; \＆＃39;，＆＃39;＆＃39;）

其中任何一个都有效。

请有人帮忙..

Answer 1

查询以降低jsonb：

WITH RECURSIVE z3 AS (
     WITH z2 AS (
          WITH RECURSIVE z AS (
               WITH x AS (
                   -- just your variable
                   SELECT '{"a":"foo", "b":"BARK", "c" :{ "d": "dog"}}'::jsonb AS j
               ) SELECT j,
                        ARRAY [ a ] AS a
                 FROM (
                        SELECT j,
                               jsonb_object_keys(j) AS a
                          FROM x
                      ) AS a
                 UNION ALL SELECT j,
                        a || b
                  FROM (
                        SELECT j,
                               a,
                               jsonb_object_keys(j#>(a)) AS b
                          FROM z
                         WHERE j#>>(a) ~ '^\{.*\}$'
                       ) AS A
           ) SELECT *,
                    dense_rank() OVER (ORDER BY a) AS i
               FROM z
              WHERE NOT j#>>(a) ~ '^\{.*\}$'
       ) SELECT i,
                jsonb_set(j, a, to_jsonb(lower(j#>>(a)))) AS j
           FROM (
                  SELECT * FROM z2 ORDER BY i LIMIT 1
                ) AS a
        UNION ALL SELECT z2.i,
                jsonb_set(z3.j,
                z2.a,
                to_jsonb(lower(z3.j#>>(z2.a))))
           FROM z3
           JOIN z2 ON (z2.i = z3.i + 1)
  ) SELECT j FROM z3 ORDER BY i DESC LIMIT 1;

一些解释： z CTE查找jsonb对象中的所有字符串。＆＃39;一个＆＃39;是json字符串的路径。输出：

                      j                       |   a   | dense_rank 
----------------------------------------------+-------+------------
 {"a": "foo", "b": "BARK", "c": {"d": "dog"}} | {a}   |          1
 {"a": "foo", "b": "BARK", "c": {"d": "dog"}} | {b}   |          2
 {"a": "foo", "b": "BARK", "c": {"d": "dog"}} | {c,d} |          3
(3 rows)

z3和dense_rank用于每个选择一个（递归调用）应用低于json。

Postgres删除jsonb字段中的反斜杠

1 个答案: