ORA-23474: definition of “string”.”string” has changed since generation of replication support
文档解释ORA-23474:definitionof“string”.”string”haschangedsincegenerationofreplicationsupportCause:Thecurrentcolumnsinthespecifiedtableandthe...
ORA-16627: operation disallowed since no standby databases would remain to support protection mode
文档解释ORA-16627:operationdisallowedsincenostandbydatabaseswouldremaintosupportprotectionmodeCause:Thisstatuswasreturnedbecauseofoneofthefollowing:–Thebroker...
http协议里的Last-Modified，If-Modified-Since，If-None-Match，ETag的简单理解
1.从服务端传给客户端的： 1）Last-Modified：表示服务端资源最后修改的时间，也就是传给客户端，用于告诉客户端，服务端资源最后修改的时间 2）Etag：表示字符串唯一标识符，也是传给客户端，用于告诉客户端，表示服务端资源发生修改了的最新标识。因为Last-Modified的一些缺陷，比如只能标识到时间秒...
The method newInstance() from the type Class is deprecated since version 9
newInstance()在java9中已被弃用JAVA9之前用法1Class.forName("类的全限定名").newInstance();JAVA9之后用法1Class.forName("类的全限定名").getDeclaredConstructor().newInstance();源码说明1/**2*Usest...