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how to get last insert id after insert query in codeigniter active record
...n insert query (active record style) used to insert the form fields into a MySQL table. I want to get the last auto-incremented id for the insert operation as the return value of my query but I have some problems with it.
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内存优化总结:ptmalloc、tcmalloc和jemalloc - 操作系统(内核) - 清泛网 - ...
...，tcmalloc性能上也有明显的优势，并且相对平稳。
github mysql优化
github使用tcmalloc后，mysql性能提升30%
Jemalloc
jemalloc是facebook推出的， 最早的时候是freebsd的libc malloc实现。 目前在firefox、facebook服务器各种组件中大量使用。
jemall...
What is the difference between a schema and a table and a database?
...ction of tables. A DBMS (Database Management System) is the software (like MySQL, SQL Server, Oracle, etc) that manages and runs a database.
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Can git be integrated with Xcode?
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Xcode 4 supports git natively (Developer Tools State of the Union Address at WWDC 2010)
Learn more here: What's new in Xcode 4
The documentation from Apple is lengthy, but a good read.
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Hibernate: “Field 'id' doesn't have a default value”
...ns but again got same error what mistake i do i don't know......I am using mysql data base.
– Krunal Patel
Feb 10 '15 at 8:46
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Counting DISTINCT over multiple columns
...INCT concat(DocumentId, DocumentSessionId)) FROM DocumentOutputItems;
In MySQL you can do the same thing without the concatenation step as follows:
SELECT count(DISTINCT DocumentId, DocumentSessionId) FROM DocumentOutputItems;
This feature is mentioned in the MySQL documentation:
http://dev.my...
使用 JSON 和 Web API · App Inventor 2 中文网
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响应内容：服务器返回的响应内容为文本，让我们看看如何将其作为JSON进行处理：
Web客户端组件提供了方法将JSON文本解码为字典 获取文本的内容，比如 响应内容 参数，并将其转换为适当的 App Inventor 类型。根据返回的内...
Windows下 C++网络延时检测 - C/C++ - 清泛网 - 专注C/C++及内核技术
...低延时、负载较低的服务器节点。例如：那么这个功能是如何实现的呢？...一般需要连接服务器后端的软件都有服务器节点网络延迟的检测，帮助选择低延时、负载较低的服务器节点。例如：
那么这个功能是如何实现的呢？...
中关村服务辐射百万创业者 - 资讯 - 清泛网 - 专注C/C++及内核技术
...间、人才、资本……成为拦在创业道路上的种种难题。
如何才能在日益变化的环境下更好地帮到创业者，成为摆在创业服务业面前的最大问题。6月25日，清控科创携手清华控股、北极光创投、完美时空、银杏天使、创业邦、盛...
How to drop all user tables?
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Being new to Oracle and I'm more familiar with MySQL; reseting a DB seems difficult. IN MySQL a USER is separate to a DATABASE. DROP USER username CASCADE worked for me. But in MySQL all I would have to do is DROP DATABASE and create a new one
– gawp...