系统迁移或者更换的时候用到的，特别注意里面的引号，很容易弄错了。
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旧会员导出
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select 'uid','username','password','email','salt' union select?
'uid','username','password','email','salt' from 'uc_members' into?
outfile '/score.sql'
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导入
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load data infile '/score.sql'
into table `chbwzstb_users`
character set utf8
fields terminated by '\t'
lines terminated by '\n'
ignore 1 lines
(`uid`, `username`, `password`, `email`, `salt`);
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