zoukankan
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数据库
数据库升级
1.拿到旧的表以及旧的列名,生成一个临时表,并把数据放到临时表里
2.删除旧表，创建新表
3.把临时表的数据放到新表中,删除临时表
多表操作需要放到事物里.
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原文地址：https://www.cnblogs.com/wangandroid/p/10605990.html
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