Postgres语法错误位于“ ON”或“ ON”附近。 [英] postgres syntax error at or near "ON"

问题描述

我创建了此表：

CREATE TABLE IF NOT EXISTS config_activity_log
(
  id                      serial primary key,
  activity_name           varchar(100) NOT NULL,
  last_config_version     varchar(50) NOT NULL,
  activity_status         varchar(100) NOT NULL DEFAULT 'Awaiting for cofman',
  cofman_last_update      bigint NOT NULL DEFAULT -1,
  is_error                boolean DEFAULT FALSE,
  activity_timestamp      timestamp DEFAULT current_timestamp
);

我尝试运行以下postgres脚本：

I try to run this postgres script:

INSERT INTO config_activity_log
    (activity_name, last_config_version, activity_status)
VALUES
    ('test awating deployment','5837-2016-08-24_09-12-22', 'Awaiting for deployment')
ON CONFLICT (activity_name)
DO UPDATE SET
    activity_status = EXCLUDED.activity_status

为什么会出现此语法错误？

why do i get this syntax error?

psql:upsert_test_log.sql:7: ERROR:  syntax error at or near "ON"
LINE 5: ON CONFLICT (activity_name)

推荐答案

支持的版本

每个@klin在上面的评论中，<$ c $仅从 PostgreSQL 9.5 起支持c> ON CONFLICT 。

Per @klin's comment above, ON CONFLICT is only supported from PostgreSQL 9.5 onwards.

如果您使用的是较早的版本，在此答案中有一些很好的信息： https://stackoverflow.com/a/1 7267423/361842

If you're on an earlier version, there's some great info in this answer: https://stackoverflow.com/a/17267423/361842

唯一约束

添加唯一索引在 activity_name 上。目前，该列上没有任何约束，因此该列上没有冲突。

Add a unique index on activity_name. At present there's no constraints on that column, so there's no possibility for a conflict on that column.

CREATE UNIQUE INDEX UK_config_activity_log__activity_name 
ON config_activity_log (activity_name);

但是，如果您不希望该列是唯一的，那么您打算发生什么冲突/您希望通过发生冲突操作解决什么问题？

If, however, you don't want that column to be unique, what conflict are you envisaging / what's the issue you're hoping to resolve with the on conflict action?

请参见 https://www.postgresql.org/docs/9.5/static/sql-insert.html#SQL-ON-CONFLICT

另一种语法是修改您的create语句以在其中包含唯一条件；例如

An alternative syntax is to modify your create statement to include the unique condition there; e.g.

CREATE TABLE IF NOT EXISTS config_activity_log
(
  id                      serial primary key,
  activity_name           varchar(100) NOT NULL UNIQUE,
  last_config_version     varchar(50) NOT NULL,
  activity_status         varchar(100) NOT NULL DEFAULT 'Awaiting for cofman',
  cofman_last_update      bigint NOT NULL DEFAULT -1,
  is_error                boolean DEFAULT FALSE,
  activity_timestamp      timestamp DEFAULT current_timestamp
);

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