在 PostgreSQL 9.5 表中,我有一integer
列social
.
当我尝试在存储过程中更新它时,给定in_users
类型变量中的以下 JSON 数据(一个包含 2 个对象的数组,每个对象都有一个“社交”键) jsonb
:
'[{"sid":"12345284239407942","auth":"ddddc1808197a1161bc22dc307accccc",**"social":3**,"given":"Alexander1","family":"Farber","photo":"https:\/\/graph.facebook.com\/1015428423940942\/picture?type=large","place":"Bochum, Germany","female":0,"stamp":1450102770}, {"sid":"54321284239407942","auth":"ddddc1808197a1161bc22dc307abbbbb",**"social":4**,"given":"Alxander2","family":"Farber","photo":null,"place":"Bochum, Germany","female":0,"stamp":1450102800}]'::jsonb
然后以下代码失败:
FOR t IN SELECT * FROM JSONB_ARRAY_ELEMENTS(in_users)
LOOP
UPDATE words_social SET
social = t->'social',
WHERE sid = t->>'sid';
END LOOP;
带有错误消息:
ERROR: column "social" is of type integer but expression is of type jsonb
LINE 3: social = t->'social',
^
HINT: You will need to rewrite or cast the expression.
我尝试将该行更改为:
social = t->'social'::int,
但后来我得到了错误:
ERROR: invalid input syntax for integer: "social"
LINE 3: social = t->'social'::int,
^
为什么 PostgreSQL 不能识别数据是integer
?
从JSON-TYPE-MAPPING-TABLE我的印象是 JSON 数字会自动转换为 PostgreSQL 数字类型。