PostgreSQL UPSERT (INSERT ... ON CONFLICT UPDATE) 失败

Question

我的 postgresql 数据库中有一行要更新。

=> SELECT * FROM reading_group_reading_session
WHERE group_id = 439 
  AND group_type = 'focus_group' 
  AND reg_user_id = 28056 
  AND device_id = ''
  AND reading_date = '2021-06-03';
  id   | group_id | group_type  | reg_user_id | device_id | reading_date | seconds_reading | num_syncs 
-------+----------+-------------+-------------+-----------+--------------+-----------------+-----------
 35532 |      439 | focus_group |       28056 |           | 2021-06-03   |            3310 |         4
(1 row)

Time: 1.820 ms
=>

我的代码生成此 SQL 语句以插入其他更新已更改的字段：

=> INSERT INTO
[more] - >   INSERT INTO reading_group_reading_session
  (group_id,group_type,reg_user_id,device_id,reading_date,seconds_reading)
VALUES
  (439,'focus_group',28056,'','2021-06-03',3320)
ON CONFLICT
  (group_id, group_type, reg_user_id, device_id, reading_date)
DO UPDATE SET
    seconds_reading = 3320;
ERROR:  23502: null value in column "num_syncs" violates not-null constraint
DETAIL:  Failing row contains (115399, 439, focus_group, 28056, , 2021-06-03, 3320, null).
SCHEMA NAME:  public
TABLE NAME:  reading_group_reading_session
COLUMN NAME:  num_syncs
LOCATION:  ExecConstraints, execMain.c:1700
Time: 3.017 ms
=>

我不明白的是，我可以 select 那一行，并且它与非 NULL num_syncs 一起出现。但是 UPSERT 失败了，因为它没有（重新）设置 num_syncs（值 4 不变）。

有人看到我遗漏了什么吗？

Fwiw，table 定义是这样的：

                                  Table "public.reading_group_reading_session"
     Column      |      Type       |                                 Modifiers                                  
-----------------+-----------------+----------------------------------------------------------------------------
 id              | integer         | not null default nextval('reading_group_reading_session_id_seq'::regclass)
 group_id        | integer         | not null
 group_type      | group_type_name | 
 reg_user_id     | integer         | not null
 device_id       | text            | 
 reading_date    | date            | 
 seconds_reading | integer         | not null
 num_syncs       | integer         | not null
Indexes:
    "reading_group_reading_session_pkey" PRIMARY KEY, btree (id)
    "reading_group_reading_session_idx_dgid" UNIQUE, btree (group_id, group_type, reg_user_id, device_id, reading_date)
Check constraints:
    "reading_group_reading_session_group_id_check" CHECK (group_id > 0)
    "reading_group_reading_session_minutes_reading_check" CHECK (seconds_reading >= 0)
    "reading_group_reading_session_num_syncs_check" CHECK (num_syncs >= 0)
    "reading_group_reading_session_reg_user_id_check" CHECK (reg_user_id >= 0)

=>

Answer 1

首先检查 NOT NULL 约束。这是有道理的，因为必须满足它们才能使 INSERT 成功。

如果您确定已经有匹配的行，请使用常规 UPDATE。

替代方法可能是使用 CHECK (colname IS NOT NULL) 约束而不是 NOT NULL。

PostgreSQL UPSERT (INSERT ... ON CONFLICT UPDATE) 失败

PostgreSQL UPSERT (INSERT ... ON CONFLICT UPDATE) fails

sql

postgresql

postgresql-9.5

upsert