Java NoSQL數據庫 OrientDB 1.0 RC5 發布

OrientDB是兼具文擋數據庫的靈活性和圖形數據庫管理鏈接能力的可深層次擴展的文檔-圖形數據庫管理系統。可選無模式、全模式或混合模式下。支持許多高級特性，諸如ACID事務、快速索引，原生和SQL查詢功能。可以JSON格式導入、導出文檔。若不執行昂貴的JOIN操作的話，如同關系數據庫可在幾毫秒內可檢索數以百記的鏈接文檔圖。
其它NoSQL數據庫可以查看： http://www.baiduhome.net/open316676.htm

Changes:

1. The new SQL [] operator was added to extract items from lists, sets, maps, and arrays.
2. ORDER BY works with projection alias.
3. Cross trees and graphs in projections.
4. The IN operator uses Index when available.
5. All known bugs on transaction recovery were fixed.
6. The memory management of MVRB-Tree was rewritten to be faster and to use much less RAM.
7. The common and core modules are compatible with Java 5

該項目主頁:http://code.google.com/p/orient/