大约有 40,000 项符合查询结果（耗时：0.0244秒） [XML]
phpcms v9与ucenter通信失败 完美解决 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...名：root （必填，视实际情况而定）
Ucenter 数据库密码：root （视实际情况而定）
Ucenter 数据库名：discuz （必填，视实际情况而定）
Ucenter 数据库表前缀：`discuz`.pre_ucenter_ （必填，视实际情况而定。如果此...
Amazon EC2, mysql aborting start because InnoDB: mmap (x bytes) failed; errno 12
...EC2 Linux Micro instance. Since Micro instances have only 613MB of memory, MySQL crashed every now and then. After a long search about MySQL, Micro Instance and Memory Managment I found out there is no default SWAP space for Micro instance. So if you want to avoid the crash you may need to setup a s...
Is there any difference between GROUP BY and DISTINCT
...CT and distinct by UNION cause an oracle error, but GROUP BY worked; I was selecting only 1 column from a view and not using any aggregation; I'm still baffled why it required it, but it does confirm there is some difference in the execution. As others point out, it also lets you GROUP BY columns no...
PHP and MySQL - how to avoid password in source code? [duplicate]
I have a small PHP application storing data in a MySQL database. Currently username / password are hard-coded in the PHP code. A situation I do not really like, for example, since the code is also available in a repository.
...
How can prepared statements protect from SQL injection attacks?
...ample shows it (all examples in PHP/Mysql):
$expected_data = 1;
$query = "SELECT * FROM users where id=$expected_data";
will produce a regular query
SELECT * FROM users where id=1
while this code
$spoiled_data = "1; DROP TABLE users;"
$query = "SELECT * FROM users where id=$spoiled_da...
What's wrong with nullable columns in composite primary keys?
...ow in a table: when a table has a primary key, you have a guranteed way to select any row from it.
A unique constraint does not necessarily identify every row; it just specifies that if a row has values in its columns, then they must be unique. This is not sufficient to uniquely identify every row...
java中的缓存技术该如何实现 - 更多技术 - 清泛网 - 专注C/C++及内核技术
java中的缓存技术该如何实现1缓存为什么要存在?2缓存可以存在于什么地方?3缓存有哪些属性?4缓存介质?搞清楚这4个问题,那么我们就可以随意的通过应用的场景来判断使用何...1、缓存为什么要存在？
2、缓存可以存在于什么地方...
The opposite of Intersect()
...
This code enumerates each sequence only once and uses Select(x => x) to hide the result to get a clean Linq-style extension method. Since it uses HashSet<T> its runtime is O(n + m) if the hashes are well distributed. Duplicate elements in either list are omitted.
publi...
OAuth那些事儿 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...提供了导入MSN联系人的功能，但前提是用户必须提供账号密码，如下图所示：
查找你的MSN联系人中有谁在人人网上
人人网信誓旦旦的宣称不会记录你的密码，它甚至提供了一个所谓保证账号安全的方法：先改密码再导入，...
C#连接有用户名密码验证的MongoDB - .NET(C#) - 清泛IT论坛，有思想、有深度
...rd@]hostname[:port][/[database][?options]]
使用MongoVUE输入用户名密码能够连接MongoDB，但是使用C#如下代码连接时出现异常“Invalid credentials for database 'admin'”：
MongoServer server = new MongoClient("mongodb://username:password@host:port").GetServer()...