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news 2025/8/8 2:02:51

西安网站开发招聘,成都官网seo费用,建设网站技术要求,网络营销方式有几种一、查找备份表和原表不一样数据 select * from A where (select count(1) from A_BAK where A.IDA_BAK.ID) 0 二、在数据量比较大的表中新增有默认值的列速度较慢问题使用以下语句，在上亿数据的表中执行速度较慢 alter table TEST add col_a integer DEFA…

一、查找备份表和原表不一样数据

select * from  A where (select count(1) from A_BAK where A.ID=A_BAK.ID) = 0

二、在数据量比较大的表中新增有默认值的列速度较慢问题

使用以下语句，在上亿数据的表中执行速度较慢

alter table TEST add col_a integer DEFAULT 0

可使用下面两种方式

alter table TEST add col_a integer DEFAULT 0 not null;

或者


alter table TEST add col_b integer；
alter table TEST modify col_b integer DEFAULT 0;

三、编译class文件java.lang.NoSuchFieldException: cacheList问题

在编译完class文件，替换war包里面对应class文件后，报Could not reload resource bundles java.lang.NoSuchFieldException: cacheList，找不到对应action，在网上查找资料，发现可能是JDK版本问题，原来使用JDK8 编译有问题，替换为JDK1.6编译，替换class文件后正常。

com.opensymphony.xwork2.util.logging.commons.CommonsLogger error Could not reload resource bundlesjava.lang.NoSuchFieldException: cacheListat java.lang.Class.getDeclaredFieldImpl(Native Method)at java.lang.Class.getDeclaredField(Class.java:575)at com.opensymphony.xwork2.util.LocalizedTextUtil.clearMap(LocalizedTextUtil.java:835)at com.opensymphony.xwork2.util.LocalizedTextUtil.reloadBundles(LocalizedTextUtil.java:794)at com.opensymphony.xwork2.util.LocalizedTextUtil.reloadBundles(LocalizedTextUtil.java:780)at com.opensymphony.xwork2.util.LocalizedTextUtil.findDefaultText(LocalizedTextUtil.java:205)at com.opensymphony.xwork2.util.LocalizedTextUtil.findDefaultText(LocalizedTextUtil.java:227)at org.apache.struts2.impl.StrutsActionProxy.getErrorMessage(StrutsActionProxy.java:70)at com.opensymphony.xwork2.DefaultActionProxy.prepare(DefaultActionProxy.java:185)at org.apache.struts2.impl.StrutsActionProxy.prepare(StrutsActionProxy.java:63)at org.apache.struts2.impl.StrutsActionProxyFactory.createActionProxy(StrutsActionProxyFactory.java:39)at com.opensymphony.xwork2.DefaultActionProxyFactory.createActionProxy(DefaultActionProxyFactory.java:58)at org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:553)at org.apache.struts2.dispatcher.ng.ExecuteOperations.executeAction(ExecuteOperations.java:77)at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:99)at com.ibm.ws.webcontainer.filter.FilterInstanceWrapper.doFilter(FilterInstanceWrapper.java:190)at com.ibm.ws.webcontainer.filter.WebAppFilterChain.doFilter(WebAppFilterChain.java:125)at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)at com.ibm.ws.webcontainer.filter.FilterInstanceWrapper.doFilter(FilterInstanceWrapper.java:190)at com.ibm.ws.webcontainer.filter.WebAppFilterChain.doFilter(WebAppFilterChain.java:125)at com.ibm.ws.webcontainer.filter.WebAppFilterChain._doFilter(WebAppFilterChain.java:80)at com.ibm.ws.webcontainer.filter.WebAppFilterManager.doFilter(WebAppFilterManager.java:908)at com.ibm.ws.webcontainer.filter.WebAppFilterManager.invokeFilters(WebAppFilterManager.java:997)at com.ibm.ws.webcontainer.extension.DefaultExtensionProcessor.invokeFilters(DefaultExtensionProcessor.java:1079)at com.ibm.ws.webcontainer.extension.DefaultExtensionProcessor.handleRequest(DefaultExtensionProcessor.java:999)at com.ibm.ws.webcontainer.webapp.WebApp.handleRequest(WebApp.java:3954)at com.ibm.ws.webcontainer.webapp.WebGroup.handleRequest(WebGroup.java:276)at com.ibm.ws.webcontainer.WebContainer.handleRequest(WebContainer.java:945)at com.ibm.ws.webcontainer.WSWebContainer.handleRequest(WSWebContainer.java:1592)at com.ibm.ws.webcontainer.channel.WCChannelLink.ready(WCChannelLink.java:191)at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleDiscrimination(HttpInboundLink.java:453)at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.handleNewRequest(HttpInboundLink.java:515)at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.processRequest(HttpInboundLink.java:306)at com.ibm.ws.http.channel.inbound.impl.HttpInboundLink.ready(HttpInboundLink.java:277)at com.ibm.ws.tcp.channel.impl.NewConnectionInitialReadCallback.sendToDiscriminators(NewConnectionInitialReadCallback.java:214)at com.ibm.ws.tcp.channel.impl.NewConnectionInitialReadCallback.complete(NewConnectionInitialReadCallback.java:113)at com.ibm.ws.tcp.channel.impl.AioReadCompletionListener.futureCompleted(AioReadCompletionListener.java:175)at com.ibm.io.async.AbstractAsyncFuture.invokeCallback(AbstractAsyncFuture.java:217)at com.ibm.io.async.AsyncChannelFuture$1.run(AsyncChannelFuture.java:205)at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:1656)