目录直接update的弊端方法一；replace into方法二：insert into [table] values… on duplicate key update方法三：创建临时表总结直接update的弊端
shirleywy2003 2022-03-07 22:02 开发者_JAVA技巧 理由:1.浴霸的工作原理是将电能转化成热能，因此浴霸对孕妇和胎儿基本不会产生负面影响。2.冬季孕妇洗澡时使用浴霸可以防止着凉。建议:1.孕妇洗澡时水温一般控
I am new to Ruby and Rails so bear with me please. I have created a very simple blog application with both posts and comments. Everything works great. My next question regarding adding categories. I a
I try to convert a local SCN repository (with all its history) to Mercurial. I am working on a Mac (10.6.2). Therefore, I am using Macports as package management tool.
I have a bitmap and would like to return an iterator of positions of set bits. Right now I just walk the whole bitmap and if bit is set, then I pr开发者_开发问答ovide next position. I believe this cou
加载中,请稍侯......