Apache Derby 10.11.1.1 发布，此版本现已提供下载，更新内容如下： * MERGE statement - MERGE is a single, join-driven statement which INSERTs, UPDATEs, and DELETEs rows. * Deferrable constraints - Constraint enforcement can now be deferred, typically to the end of a transaction. * WHEN clause in CREATE TRIGGER - An optional WHEN clause has been added which determines which rows fire a trigger. * Rolling log file - The Derby diagnostic log can now be split across a sequence of files. * Experimental Lucene support - Derby text columns can now be indexed and queried via Apache Lucene. * Simple case expression - The "simple" and "extended" syntax for CASE expressions has been added. * Better concurrency for identity columns - The concurrency of identity columns has been boosted. * New ij HoldForConnection command - A new ij command has been added to change the default cursor holdability. * Standard syntax for altering column nullability - Standard syntax has been added for altering the nullability of columns. Apache Derby是Apache软件基金会所研发的开放源码数据库管理系统；由于Derby是一个纯Java程式，因此只需要操作系统支援Java虚拟机，Derby便可执行。 Derby是特别地为Java环境进行优化，Derby本身不仅是一个纯Java程式，而且Derby在执行用户的SQL程式时，能够把SQL编译成Java bytecode并以系统的Java虚拟机执行。由于SQL程式转成的Java bytecode能被JIT动态翻译，因此Derby可能比传统的数据库管理系统更佳的性能。 其他特性包括：
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