04 2010 档案

关于 分布式Oracle中 database link
摘要:在做分布式数据库时难免用到dblink,但关于dblink的资料很少,很多书上提到了,但不详细。 数据库链接定义从一个Oracle数据库到另一个数据库的单行通信通道。 建立链接前要先有到远程数据库的命名服务(连接字符串),就是tnsnames.ora中描述的那个,如'oradXP' 先测试一下:$tnsping oradxp Attemping to contact(...) OK(30毫秒). ... 阅读全文

posted @ 2010-04-20 11:31 逗号李 阅读(2659) 评论(0) 推荐(0)

csharp notes - 3
摘要:1. A lambda expression is an unnamed method written in place of a delegate instance The compiler immediately converts the lambda expression to either: A delegate instance An expression tree, of type ... 阅读全文

posted @ 2010-04-07 16:31 逗号李 阅读(195) 评论(0) 推荐(0)

csharp notes – 2
摘要:1. delegate Compatibility 1) Type compatibility Delegate types are all incompatible with each other, even if their signatures are the same delegate void D1( ); delegate void D2( ); ... D1 d1 = Metho... 阅读全文

posted @ 2010-04-02 16:25 逗号李 阅读(131) 评论(0) 推荐(0)

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