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please try againinclude error,path:/comp/news/category?compId=news_category-1540360787811 cause:org.springframework.web.util.NestedServletException: Request processing failed; nested exception is java.lang.RuntimeException: org.springframework.dao.TransientDataAccessResourceException: ### Error querying database. Cause: java.sql.SQLException: Could not retrieve transation read-only status server ### The error may exist in URL [jar:file:/data/java_webdir/sc-site-1.0.0-SNAPSHOT_2019-04-22-15-49-47/lib/service-info-provider-1.0.0-SNAPSHOT.jar!/mybatis/InfoCategoryMapper.xml] ### The error may involve defaultParameterMap ### The error occurred while setting parameters ### SQL: /*!mycat:datanode=SITE_93762 */SELECT ID,PARENT_ID,NAME,DES,SUMMARY,KEYWORDS,LINK_URL,IMG_URL,IMG_ID,CREATE_DATE,TYPE,SHOW_FLAG,SHOW_STYLE,DETAIL_STYLE,SHOW_ORDER,NEW_OPEN,APP_ID, MOBILE_DES,MOBILE_LINK_URL,MOBILE_NEW_OPEN,MOBILE_SHOW_STYLE,MOBILE_DETAIL_STYLE,MOBILE_SHOW_FLAG FROM INFO_CATEGORY WHERE 1=1 AND ISNULL(PARENT_ID) AND SHOW_FLAG=1 ORDER BY SHOW_ORDER ### Cause: java.sql.SQLException: Could not retrieve transation read-only status server ; SQL []; Could not retrieve transation read-only status server; nested exception is java.sql.SQLException: Could not retrieve transation read-only status server org.springframework.dao.TransientDataAccessResourceException: ### Error querying database. Cause: java.sql.SQLException: Could not retrieve transation read-only status server ### The error may exist in URL [jar:file:/data/java_webdir/sc-site-1.0.0-SNAPSHOT_2019-04-22-15-49-47/lib/service-info-provider-1.0.0-SNAPSHOT.jar!/mybatis/InfoCategoryMapper.xml] ### The error may involve defaultParameterMap ### The error occurred while setting parameters ### SQL: /*!mycat:datanode=SITE_93762 */SELECT ID,PARENT_ID,NAME,DES,SUMMARY,KEYWORDS,LINK_URL,IMG_URL,IMG_ID,CREATE_DATE,TYPE,SHOW_FLAG,SHOW_STYLE,DETAIL_STYLE,SHOW_ORDER,NEW_OPEN,APP_ID, MOBILE_DES,MOBILE_LINK_URL,MOBILE_NEW_OPEN,MOBILE_SHOW_STYLE,MOBILE_DETAIL_STYLE,MOBILE_SHOW_FLAG FROM INFO_CATEGORY WHERE 1=1 AND ISNULL(PARENT_ID) AND SHOW_FLAG=1 ORDER BY SHOW_ORDER ### Cause: java.sql.SQLException: Could not retrieve transation read-only status server ; SQL []; Could not retrieve transation read-only status server; nested exception is java.sql.SQLException: Could not retrieve transation read-only status server at org.springframework.jdbc.support.SQLStateSQLExceptionTranslator.doTranslate(SQLStateSQLExceptionTranslator.java:108) at org.springframework.jdbc.support.AbstractFallbackSQLExceptionTranslator.translate(AbstractFallbackSQLExceptionTranslator.java:73) at org.springframework.jdbc.support.AbstractFallbackSQLExceptionTranslator.translate(AbstractFallbackSQLExceptionTranslator.java:81) at org.springframework.jdbc.support.AbstractFallbackSQLExceptionTranslator.translate(AbstractFallbackSQLExceptionTranslator.java:81) at org.mybatis.spring.MyBatisExceptionTranslator.translateExceptionIfPossible(MyBatisExceptionTranslator.java:71) at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:364) at com.sun.proxy.$Proxy30.selectList(Unknown Source) at org.mybatis.spring.SqlSessionTemplate.selectList(SqlSessionTemplate.java:194) at org.apache.ibatis.binding.MapperMethod.executeForMany(MapperMethod.java:119) at org.apache.ibatis.binding.MapperMethod.execute(MapperMethod.java:63) at org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:52) at com.sun.proxy.$Proxy158.findChildren(Unknown Source) at cn.ce.ebiz.info.service.impl.InfoCategoryServiceImpl.findRootCategoryList(InfoCategoryServiceImpl.java:467) at sun.reflect.GeneratedMethodAccessor1619.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:333) at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:190) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157) at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:99) at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:280) at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:92) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179) at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:213) at com.sun.proxy.$Proxy159.findRootCategoryList(Unknown Source) at com.alibaba.dubbo.common.bytecode.Wrapper103.invokeMethod(Wrapper103.java) at com.alibaba.dubbo.rpc.proxy.javassist.JavassistProxyFactory$1.doInvoke(JavassistProxyFactory.java:45) at com.alibaba.dubbo.rpc.proxy.AbstractProxyInvoker.invoke(AbstractProxyInvoker.java:71) at com.alibaba.dubbo.config.invoker.DelegateProviderMetaDataInvoker.invoke(DelegateProviderMetaDataInvoker.java:48) at com.alibaba.dubbo.rpc.protocol.InvokerWrapper.invoke(InvokerWrapper.java:52) at cn.ce.ebiz.framework.remoting.DubboContextFilter.invoke(DubboContextFilter.java:220) at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:68) at com.alibaba.dubbo.rpc.filter.ExceptionFilter.invoke(ExceptionFilter.java:61) at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:68) at com.alibaba.dubbo.rpc.filter.TimeoutFilter.invoke(TimeoutFilter.java:41) at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:68) at com.alibaba.dubbo.monitor.support.MonitorFilter.invoke$original$BRSRBpCn(MonitorFilter.java:74) at com.alibaba.dubbo.monitor.support.MonitorFilter.invoke$original$BRSRBpCn$accessor$s5kXEZwK(MonitorFilter.java) at com.alibaba.dubbo.monitor.support.MonitorFilter$auxiliary$Rmhiq5ug.call(Unknown Source) at org.apache.skywalking.apm.agent.core.plugin.interceptor.enhance.InstMethodsInter.intercept(InstMethodsInter.java:93) at com.alibaba.dubbo.monitor.support.MonitorFilter.invoke(MonitorFilter.java) at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:68) at com.alibaba.dubbo.rpc.protocol.dubbo.filter.TraceFilter.invoke(TraceFilter.java:77) at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:68) at com.alibaba.dubbo.rpc.filter.ContextFilter.invoke(ContextFilter.java:71) at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:68) at com.alibaba.dubbo.rpc.filter.GenericFilter.invoke(GenericFilter.java:131) at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:68) at com.alibaba.dubbo.rpc.filter.ClassLoaderFilter.invoke(ClassLoaderFilter.java:37) at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:68) at com.alibaba.dubbo.rpc.filter.EchoFilter.invoke(EchoFilter.java:37) at com.alibaba.dubbo.rpc.protocol.ProtocolFilterWrapper$1.invoke(ProtocolFilterWrapper.java:68) at com.alibaba.dubbo.rpc.protocol.dubbo.DubboProtocol$1.reply(DubboProtocol.java:98) at com.alibaba.dubbo.remoting.exchange.support.header.HeaderExchangeHandler.handleRequest(HeaderExchangeHandler.java:96) at com.alibaba.dubbo.remoting.exchange.support.header.HeaderExchangeHandler.received(HeaderExchangeHandler.java:168) at com.alibaba.dubbo.remoting.transport.DecodeHandler.received(DecodeHandler.java:50) at com.alibaba.dubbo.remoting.transport.dispatcher.ChannelEventRunnable.run(ChannelEventRunnable.java:79) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) at java.lang.Thread.run(Thread.java:745) Caused by: java.sql.SQLException: Could not retrieve transation read-only status server at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1078) at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:989) at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:975) at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:920) at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:951) at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:941) at com.mysql.jdbc.ConnectionImpl.isReadOnly(ConnectionImpl.java:3936) at com.mysql.jdbc.ConnectionImpl.isReadOnly(ConnectionImpl.java:3907) at com.mysql.jdbc.PreparedStatement.checkReadOnlySafeStatement(PreparedStatement.java:1258) at com.mysql.jdbc.PreparedStatement.execute$original$iKv3UZNf(PreparedStatement.java:1278) at com.mysql.jdbc.PreparedStatement.execute$original$iKv3UZNf$accessor$8MrRun0g(PreparedStatement.java) at com.mysql.jdbc.PreparedStatement$auxiliary$8WLNdFrF.call(Unknown Source) at org.apache.skywalking.apm.agent.core.plugin.interceptor.enhance.InstMethodsInter.intercept(InstMethodsInter.java:93) at com.mysql.jdbc.PreparedStatement.execute(PreparedStatement.java) at com.mchange.v2.c3p0.impl.NewProxyPreparedStatement.execute(NewProxyPreparedStatement.java:989) at org.apache.ibatis.executor.statement.PreparedStatementHandler.query(PreparedStatementHandler.java:59) at org.apache.ibatis.executor.statement.RoutingStatementHandler.query(RoutingStatementHandler.java:73) at sun.reflect.GeneratedMethodAccessor269.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at org.apache.ibatis.plugin.Plugin.invoke(Plugin.java:62) at com.sun.proxy.$Proxy584.query(Unknown Source) at org.apache.ibatis.executor.SimpleExecutor.doQuery(SimpleExecutor.java:60) at org.apache.ibatis.executor.BaseExecutor.queryFromDatabase(BaseExecutor.java:267) at org.apache.ibatis.executor.BaseExecutor.query(BaseExecutor.java:137) at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:96) at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:77) at sun.reflect.GeneratedMethodAccessor266.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at org.apache.ibatis.plugin.Plugin.invoke(Plugin.java:62) at com.sun.proxy.$Proxy583.query(Unknown Source) at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:108) at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:102) at sun.reflect.GeneratedMethodAccessor273.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:354) ... 56 more Caused by: java.sql.SQLException: ResultSet is from UPDATE. No Data. at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1078) at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:989) at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:975) at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:920) at com.mysql.jdbc.ResultSetImpl.next(ResultSetImpl.java:6999) at com.mysql.jdbc.ConnectionImpl.isReadOnly(ConnectionImpl.java:3931) ... 87 more
精密模具制造过程中有哪些特点?
精密模具制造有哪些特点:   1、耐磨性   坯料在模具型腔中塑性变性时,沿型腔表面既流动又滑动,使型腔表面与坯料间产生剧烈的摩擦,从而导致模具因磨损而失效。所以材料的耐磨性是模具最基本、最重要的性能之一。硬度是影响耐磨性的主要因素。一般情况下,模具零件的硬度越高,磨损量越小,耐磨性也越好。另外,耐磨性还与材料中碳化物的种类、数量、形态、大小及分布有关。   2.强韧性   模具的工作条件大多十分
2018-08-31 18:17
现代机械制造工艺及精密加工技术深度分析
当前,社会经济的快速发展对现代机械制造提出更高的要求,而以往传统型机械制造工艺已不能满足新需求,这就需要积极引进现代机械制造工艺及精密加工技术,从而推动机械制造行业的快速稳健发展。    1、现代机械制造工艺    (1)气体保护焊焊接工艺。气体保护焊焊接工艺是一种以电弧为热源、以气体为被焊接物体的保护介质的焊接工艺。焊接过程中,气体会利用自身功能在电弧周围形成一层强大的保护层,能发挥熔池及分割电
2018-08-31 18:11
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随着汽车产销量的快速增长,能源和环境问题日益突出。政府对汽车能耗及尾气排放标准日趋严格,在诸多节能减排路径中,汽车轻量化是降低汽车燃油消耗和实现节能减排的重要措施。此外,《中国制造2025》及“双积分”政策的实施也让新能源汽车得到政策青睐与支持。轻量化是未来汽车发展的必然趋势。由全球最大的会展主办机构励展博览集团主办的“2018亚洲汽车轻量化展览会”将于7月11-13日在上海新国际博览中心启幕。展
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