android_hdh的博客

1、当连接数据库时这样写url="jdbc:mysql://localhost:3306/RQDataBase?useUnicode=true&characterEncoding=UTF-8"2、如果是用连接池则用url="jdbc:mysql://localhost:3306/RQDataBase?useUnicode=true&characterEncoding=UTF

错误日志：Error Code: 1175. You are using safe update mode and you tried to update a table without a WHERE that uses a KEY column. To disable safe mode, toggle the option in Preferences -> SQL Editor a...

update 表名 set 列名 = replace(列名,'原值','新值')