专注于互联网--专注于架构

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declare @user nvarchar(20)select @user=\'user1\'use countme/*判断用户是否存在*/declare @userweek select @userweek=[week] from base where userid=@userselect @@rowcount @@rowcount=0select @userweek最后@userweek打印出来结果就是记录用户名为user1week字段值而当我们用下面语句选择所有记录时(没有whe [阅读全文] [PDF]
ansistring - char ansistring.c_str(); char - ansistring ansistring=ansistring(char); bstr - char* char* char1=ansistring(bstr).c_str(); wchar_t - ansistring ansistring(wchar_t) ansistring - wchart ansistirng.widechar(); char - widestring char *s=\"adsfdsf\"; wchar *p=widetring(s).bstr [阅读全文] [PDF]
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