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Best way to test if a row exists in a MySQL table
I'm trying to find out if a row exists in a table. Using MySQL, is it better to do a query like this:
12 Answers
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Can't install Ruby under Lion with RVM – GCC issues
...e two lines:
http://stackoverflow.com/questions/8000145/ruby-rvm-llvm-and-mysql
bash-3.2$ rvm get head
bash-3.2$ CC=/usr/bin/gcc-4.2 rvm install 1.9.3 --enable-shared
Before that I had tried every stackoverflow article on Ruby and Lion so doing these may have done some setup that helped the abov...
Types in MySQL: BigInt(20) vs Int(20)
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See http://dev.mysql.com/doc/refman/8.0/en/numeric-types.html
INT is a four-byte signed integer.
BIGINT is an eight-byte signed integer.
They each accept no more and no fewer values than can be stored in their respective number of by...
【解决】App Inventor 2 如何下载/保存网络图片？ - App Inventor 2 中文网...
首先，需要使用“Web客户端”组件，需要和网络url进行数据交互的场景就要考虑使用它。设置好网络图片的url，然后执行Get方法即可，代码如下：其中，特别要注意的是保存相应信息属性设置为真，这样才能将目标网络图片保存...
Remote connect to clearDB heroku database
How can i perform a remote connect to ClearDB MySQL database on heroku using for example MySQL Query Browser. Where to get url, port, login and password?
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App Inventor 2 中文网 · 项目指南
... 学习目标：本地存储之“微数据库”组件的使用，如何持久化App数据。 开始学习 二分算法（BinarySearch） ...
Reference - What does this error mean in PHP?
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Warning: mysql_fetch_array() expects parameter 1 to be resource, boolean given
First and foremost:
Please, don't use mysql_* functions in new code. They are no longer maintained and are officially deprecated. See the red box? Lea...
Citrix服务器虚拟化：XenApp 6.5发布服务器上的应用程序 - 更多技术 - 清泛...
...的其他应用程序旁边。用户无须了解应用程序在何处以及如何执行。
8) 脱机访问:配置并交付之后，应用程序在断开网络连接后也可供用户使用。
9) 易于灾难恢复:按需应用程序交付对灾难恢复状况而言是一个强大的概念，...
Set value to NULL in MySQL
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You're probably quoting 'NULL'. NULL is a reserved word in MySQL, and can be inserted/updated without quotes:
INSERT INTO user (name, something_optional) VALUES ("Joe", NULL);
UPDATE user SET something_optional = NULL;
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How do I get the last inserted ID of a MySQL table in PHP?
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If you're using PDO, use PDO::lastInsertId.
If you're using Mysqli, use mysqli::$insert_id.
If you're still using Mysql:
Please, don't use mysql_* functions in new code. They are no longer maintained and are officially deprecated. See the red box? Learn about prepared statements ...