小编jan*_*anr的帖子

根据postgres文档,您可以将键添加到hstore列,如下所示:

UPDATE tab SET h = h || ('c' => '3');

但它似乎只有在hstore字段不为空时才有效.例如:

postgres=# create table htest (t text, h hstore);
CREATE TABLE
postgres=# insert into htest (t) VALUES ('key');
INSERT 0 1
postgres=# update htest set h = h || ('foo'=>'bar') where t='key';
UPDATE 1
postgres=# select * from htest;
  t  | h 
-----+---
 key | 
(1 row)

更新成功,但hstore未更新.然而:

postgres=# update htest set h = ('foo'=>'bar') where t='key';
UPDATE 1
postgres=# select * from htest;
  t  |      h       
-----+--------------
 key …