如何插入记录或更新(如果已存在)? [英] How to INSERT a record or UPDATE if it already exists?

问题描述

我有一个表，其中包含列record_id(汽车公司)，sender，sent_time和status.

I have a table with columns record_id (auto inc), sender, sent_time and status.

如果没有特定发件人的任何记录，例如"sender1"，我必须插入新记录，否则我必须更新属于"user1"的现有记录.

In case there isn't any record of a particular sender, for example "sender1", I have to INSERT a new record otherwise I have to UPDATE the existing record which belongs to "user1".

因此，如果尚未存储任何记录，我将执行

So if there isn't any record already stored, I would execute

# record_id is AUTO_INCREMENT field
INSERT INTO messages (sender, sent_time, status)
VALUES (@sender, time, @status)

否则，我将执行UPDATE语句.

Otherwise I would execute UPDATE statement.

无论如何，如果没有任何字段发件人值为"user1"的记录，否则有人知道如何组合这两个语句以插入新记录吗?

Anyway.. does anyone know how to combine these two statements in order to insert a new record if there isn't any record where the field sender value is "user1" otherwise update the existing record?

推荐答案

MySQL支持

MySQL supports the insert-on-duplicate syntax, f.e.:

INSERT INTO table (key,col1) VALUES (1,2)
  ON DUPLICATE KEY UPDATE col1 = 2;

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