Oracle索引
oracle的索引陷阱一个表中有几百万条数据，对某个字段加了索引，但是查询时性能并没有什么提高，这主要可能是oracle的索引限制造成的。 oracle的索引有一些索引限制，在这些索引限制发生的情况下，即使已经加了索引，oracle还是会执行一次全表扫描，查询的性能不会比不加索引有所提高，反而...
Javascript Drag&Drop Example
Code Example: Drag Object (compatible with IE, Firefox, Opera...) .dragAble {position:relative;cursor:move;}
Hibernate session management
Session per Operation (Anti pattern) 2. Session per Request use “Open Session In View” when rendering layer seperate from servlet, e.g. in JSP ...
Web related
Tomcat load balance/cluster/fail off 2. SSO based on CAS tomcat JBoss portal SSL 3. Acegi filter / JAAS 4.
Hibernate Notes
inverse=true | false 2. cascade 3. lazy-loading 4. session-per-request & open session filter 5. transaction demarcation
Retrieve system parameters of Java programs
The system parameters passed in when executing a Java program can be obtained in the program through the following methods: Java - D parameter 1&#x...
Java Virtual Machine
Taken from: http://www.ibm.com/developerworks/cn/java/j-lo-jvm-perf/ The implementation of JVM includes Sun Hotspot, IBM J9, and Oracle JRockit Jav...
Websphere MQ
Java MQ provides two methods for handling large messages: message sharding and message grouping. Message sharding and message grouping are common m...
Java serialization
The general serialization methods include: 1 Sequenced into binary byte streams using JDK’s serializable interface RMI, EJB, and distributed applic...
The use of this in Javascript
Taken from: http://www.ruanyifeng.com/blog/2010/04/using_this_keyword_in_javascript.html This is a keyword in the Javascript language. It represent...