您好，我想为我的表添加分区。 表格多媒体包含最近 7 天的记录 所以我想创建 7 个分区，一个分区 - 一天 所以尝试执行此迁移:
def up
execute "ALTER TABLE multimedia
partition by range (to_days(created_at))
(
PARTITION p0 VALUES LESS THAN (to_days(#{Time.now - (7 * 24 * 60 * 60)})),
PARTITION p1 VALUES LESS THAN (to_days(#{Time.now - (6 * 24 * 60 * 60)})),
PARTITION p2 VALUES LESS THAN (to_days(#{Time.now - (5 * 24 * 60 * 60)})),
PARTITION p3 VALUES LESS THAN (to_days(#{Time.now - (4 * 24 * 60 * 60)})),
PARTITION p4 VALUES LESS THAN (to_days(#{Time.now - (3 * 24 * 60 * 60)})),
PARTITION p5 VALUES LESS THAN (to_days(#{Time.now - (2 * 24 * 60 * 60)})),
PARTITION p6 VALUES LESS THAN (to_days(#{Time.now - (1 * 24 * 60 * 60)})),
PARTITION p7 VALUES LESS THAN (to_days(#{Time.now - (0 * 24 * 60 * 60)})),
PARTITION p8 VALUES LESS THAN MAXVALUE
);"
end
迁移的结果是以下错误:
An error has occurred, all later migrations canceled:
Mysql2::Error: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near
'11:09:43 +0200)),
PARTITION p1 VALUES LESS THAN (to_days(2012-04-18 11:0' at line 4: ALTER TABLE multimedia
partition by range (to_days(created_at))
(
== AddPartitionToMultimedia: migrating =======================================
--
execute("ALTER TABLE multimedia \n
partition by range (to_days(created_at))\n
( \n
PARTITION p0 VALUES LESS THAN (to_days(2012-04-17 11:09:43 +0200)),\n
PARTITION p1 VALUES LESS THAN (to_days(2012-04-18 11:09:43 +0200)),\n
PARTITION p2 VALUES LESS THAN (to_days(2012-04-19 11:09:43 +0200)),\n
PARTITION p3 VALUES LESS THAN (to_days(2012-04-20 11:09:43 +0200)),\n
PARTITION p4 VALUES LESS THAN (to_days(2012-04-21 11:09:43 +0200)),\n
PARTITION p5 VALUES LESS THAN (to_days(2012-04-22 11:09:43 +0200)),\n
PARTITION p6 VALUES LESS THAN (to_days(2012-04-23 11:09:43 +0200)),\n
PARTITION p7 VALUES LESS THAN (to_days(2012-04-24 11:09:43 +0200)),\n
PARTITION p8 VALUES LESS THAN MAXVALUE \n
);")
最佳答案
to_days 函数有错误。您需要确保传递给 to_days 的值是字符串类型。类似于下面的代码:
to_days('2012-04-17 11:09:43 +0200')
^ ^
| |
关于mysql按天分区，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/10295101/