在重复键更新时添加值

Question

我有一个 table 架构：

storeId varchar(255),
ttl int,
date varchar(255),
bytes bigint(255),
UNIQUE KEY storeId_date_index (storeId, date)

我想插入一行，如果它不存在，否则更新它。

对于我点击的每个重复键，我想将旧值与新值相加。使用 ON DUPLICATE KEY UPDATE 命令怎么可能？

这是我目前的情况：

insert into table (storeId, date, ttl, bytes) 
values 
('477866', '2019-02-05', 54543543, 100),
('6301', '2019-02-05', 54543543, 999999),
('12345', '2019-02-05', 54543543, 999999)
ON DUPLICATE KEY UPDATE
bytes = oldval + newval # sum old value with new value where storeId and date match in the values

Answer 1

引用[文档(https://dev.mysql.com/doc/refman/8.0/en/insert-on-duplicate.html):

In assignment value expressions in the ON DUPLICATE KEY UPDATE clause, you can use the VALUES(col_name) function to refer to column values from the INSERT portion of the INSERT ... ON DUPLICATE KEY UPDATE statement.

即：

INSERT INTO mhytable(storeId, date, ttl, bytes) 
VALUES 
('477866', '2019-02-05', 54543543, 100),
('6301', '2019-02-05', 54543543, 999999),
('12345', '2019-02-05', 54543543, 999999)
ON DUPLICATE KEY UPDATE
bytes = bytes + VALUES(bytes)

在重复键更新时添加值

Add Value On Duplicate Key Update

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sql-insert