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[MySQL FAQ]系列 — mysqldump加-w参数备份

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Release: 2016-06-07 16:42:28
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我们在用mysqldump备份数据时,有个选项是 where / -w,可以指定备份条件,这个选项的解释是: -w, --where=name Dump only selected records. Quotes are mandatory 我们可以做个测试,例如: mysqldump --single-transaction -w ' id 10000 ' mydb mytable

我们在用mysqldump备份数据时,有个选项是 –where / -w,可以指定备份条件,这个选项的解释是:

-w, --where=name Dump only selected records. Quotes are mandatory

我们可以做个测试,例如:

mysqldump --single-transaction -w ' id mydump.sql

这时候就可以备份出mytable表中 id mysqldump --single-transaction -w " id mydump.sql

在这里,一定注意单引号和双引号问题,避免出现这种情况:

mysqldump --single-transaction -w ' id mydump.sql

这样的话,结果条件会被解析成:

WHERE id 眼尖的同学会发现,时间条件变成了: WHERE id 也就是变成了: unix_timestamp(2007) -- 2014-6-1 = 2007

这和我们原先的设想大相径庭,因此一定要谨慎。

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