what is DAO

最新推荐文章于 2021-01-19 11:45:18 发布
最新推荐文章于 2021-01-19 11:45:18 发布
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分类专栏： Reading Notes 文章标签： DAO Java SUN HTML
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本文链接：https://blog.youkuaiyun.com/westwin/article/details/83891740

http://java.sun.com/blueprints/corej2eepatterns/Patterns/DataAccessObject.html

3分钟了解什么是区块链中的DAO?
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很多人在讨论数字货币和区块链的时候，经常会将比特币、以太坊、或者某个项目称为DAO，而又听说有个叫DAO的众筹项目被黑客攻击，为什么有两个DAO？这两个DAO是一回事情吗？那么到底什么是DAO，让我来和大家解释一下。  其实，这两个DAO是不一样的，前面说的DAO，是“分布式自治组织”（Distributed Autonomous Organization）的缩写，这是一种基于区
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在本指南中，我们将引导你了解创建DAO的步骤、需要考虑的重要决定，以及成功运营的最佳案例。
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http://java.sun.com/blueprints/corej2eepatterns/Patterns/DataAccessObject.html
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上一节内容的主要问题是，连接数据库时，数据的处理不规范， 多次使用重定向技术， 解决方式如下 1、dao(data access object  数据访问对象) (1)什么是dao? 封装了数据访问逻辑的模块。 (2)如何写一个dao? step1,写一个实体类 实体类与表对应，一般来说，表有哪些字段， 实体类就会有相应的属性，属性的类型与字段的类 型要匹配，并且这些属
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什么错误 org.springframework.beans.factory.CannotLoadBeanClassException: Cannot find class [com.landray.kmss.mydq.cbs.dao.impl.SycOaCbsDaoImpl] for bean with name 'sycOaCbsDao' defined in ServletContext resource [/WEB-INF/KmssConfig/mydq/cbs/spring.xml]; nested exception is java.lang.ClassNotFoundException: com.landray.kmss.mydq.cbs.dao.impl.SycOaCbsDaoImpl at org.springframework.beans.factory.support.AbstractBeanFactory.resolveBeanClass(AbstractBeanFactory.java:1278) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.predictBeanType(AbstractAutowireCapableBeanFactory.java:573) at org.springframework.beans.factory.support.AbstractBeanFactory.isFactoryBean(AbstractBeanFactory.java:1347) at org.springframework.beans.factory.support.AbstractBeanFactory.isFactoryBean(AbstractBeanFactory.java:913) at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:619) at com.landray.kmss.framework.spring.core.LookupListableBeanFactory.preInstantiateSingletons(LookupListableBeanFactory.java:40) at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:942) at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:482) at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:410) at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:306) at com.landray.kmss.sys.config.loader.ContextLoaderSupport4Spring3x.initWebApplicationContext(ContextLoaderSupport4Spring3x.java:79) at com.landray.kmss.sys.config.loader.ContextLoaderSupport4Spring3x.access$1(ContextLoaderSupport4Spring3x.java:75) at com.landray.kmss.sys.config.loader.ContextLoaderSupport4Spring3x$LoadContext.initLoadContextHelper(ContextLoaderSupport4Spring3x.java:201) at com.landray.kmss.sys.config.loader.ContextLoaderSupport4Spring3x$LoadContext.initLoad(ContextLoaderSupport4Spring3x.java:190) at com.landray.kmss.sys.config.loader.ContextLoaderSupport4Spring3x.initSmartApplicationContext(ContextLoaderSupport4Spring3x.java:67) at com.landray.kmss.sys.config.loader.SpringLoader.doLoad(SpringLoader.java:36) at com.landray.kmss.framework.loader.FrameworkContextLoader.doFrameworkLoader(FrameworkContextLoader.java:122) at com.landray.kmss.framework.loader.FrameworkContextLoader.doLoadForPoint(FrameworkContextLoader.java:105) at com.landray.kmss.framework.loader.FrameworkContextLoader.doLoad(FrameworkContextLoader.java:75) at com.landray.kmss.framework.plugin.core.event.AbstractEventDefinition$VirtualLoadChain.doLoad(AbstractEventDefinition.java:294) at com.landray.kmss.framework.service.plugin.config.FromAttributeInterceptor.doLoad(FromAttributeInterceptor.java:46) at com.landray.kmss.framework.plugin.core.event.AbstractEventDefinition$VirtualLoadChain.doLoad(AbstractEventDefinition.java:294) at com.landray.kmss.framework.plugin.core.event.AbstractEventDefinition.loadDefinition(AbstractEventDefinition.java:245) at com.landray.kmss.framework.plugin.core.support.AbstractPluginFactory.getExtensionPoint(AbstractPluginFactory.java:44) at com.landray.kmss.framework.plugin.core.support.DefaultListableFactory.instantiateAllPlugin(DefaultListableFactory.java:54) at com.landray.kmss.framework.plugin.core.context.AbstractApplicationContext.refresh(AbstractApplicationContext.java:74) at com.landray.kmss.framework.plugin.core.context.AbstractConfigurableApplicationContext.refresh(AbstractConfigurableApplicationContext.java:48) at com.landray.kmss.framework.plugin.core.context.PluginContextLoader.createPluginContext(PluginContextLoader.java:74) at com.landray.kmss.framework.plugin.core.context.PluginContextLoader.initPluginContext(PluginContextLoader.java:42) at com.landray.kmss.framework.plugin.core.context.PluginContextLoader.initPluginContext(PluginContextLoader.java:32) at com.landray.kmss.framework.plugin.loader.PluginContextLoaderListener.contextInitialized(PluginContextLoaderListener.java:174) at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:5128) at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5653) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:1007) at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:983) at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:639) at org.apache.catalina.startup.HostConfig.manageApp(HostConfig.java:1898) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:302) at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819) at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801) at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:633) at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:577) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:302) at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819) at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801) at com.sun.jmx.remote.security.MBeanServerAccessController.invoke(MBeanServerAccessController.java:468) at javax.management.remote.rmi.RMIConnectionImpl.doOperation(RMIConnectionImpl.java:1487) at javax.management.remote.rmi.RMIConnectionImpl.access$300(RMIConnectionImpl.java:97) at javax.management.remote.rmi.RMIConnectionImpl$PrivilegedOperation.run(RMIConnectionImpl.java:1328) at java.security.AccessController.doPrivileged(Native Method) at javax.management.remote.rmi.RMIConnectionImpl.doPrivilegedOperation(RMIConnectionImpl.java:1427) at javax.management.remote.rmi.RMIConnectionImpl.invoke(RMIConnectionImpl.java:848) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:322) at sun.rmi.transport.Transport$2.run(Transport.java:202) at sun.rmi.transport.Transport$2.run(Transport.java:199) at java.security.AccessController.doPrivileged(Native Method) at sun.rmi.transport.Transport.serviceCall(Transport.java:198) at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:567) at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:828) at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.access$400(TCPTransport.java:619) at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler$1.run(TCPTransport.java:684) at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler$1.run(TCPTransport.java:681) at java.security.AccessController.doPrivileged(Native Method) at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:681) 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.lang.ClassNotFoundException: com.landray.kmss.mydq.cbs.dao.impl.SycOaCbsDaoImpl at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1952) at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1795) at org.springframework.util.ClassUtils.forName(ClassUtils.java:268) at org.springframework.beans.factory.support.AbstractBeanDefinition.resolveBeanClass(AbstractBeanDefinition.java:419) at org.springframework.beans.factory.support.AbstractBeanFactory.doResolveBeanClass(AbstractBeanFactory.java:1299) at org.springframework.beans.factory.support.AbstractBeanFactory.resolveBeanClass(AbstractBeanFactory.java:1270) ... 79 more 2025-08-20 10:31:14,755 [ERROR] ==== RMI TCP Connection(2)-127.0.0.1: com.landray.kmss.framework.plugin.core.support.DefaultListableFactory.loadDefinition(251) 鏍规嵁鏂囦欢[/WEB-INF/KmssConfig/sys/common/plugin.xml]鎵╁睍鐐瑰畾涔塠com.landray.kmss.sys.config.loader]锛屽垱寤烘墿灞曠偣瀹炰緥鏃跺嚭閿� org.springframework.beans.factory.CannotLoadBeanClassException: Cannot find class [com.landray.kmss.mydq.cbs.dao.impl.SycOaCbsDaoImpl] for bean with name 'sycOaCbsDao' defined in ServletContext resource [/WEB-INF/KmssConfig/mydq/cbs/spring.xml]; nested exception is java.lang.ClassNotFoundException: com.landray.kmss.mydq.cbs.dao.impl.SycOaCbsDaoImpl at org.springframework.beans.factory.support.AbstractBeanFactory.resolveBeanClass(AbstractBeanFactory.java:1278) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.predictBeanType(AbstractAutowireCapableBeanFactory.java:573) at org.springframework.beans.factory.support.AbstractBeanFactory.isFactoryBean(AbstractBeanFactory.java:1347) at org.springframework.beans.factory.support.AbstractBeanFactory.isFactoryBean(AbstractBeanFactory.java:913) at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:619) at com.landray.kmss.framework.spring.core.LookupListableBeanFactory.preInstantiateSingletons(LookupListableBeanFactory.java:40) at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:942) at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:482) at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:410) at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:306) at com.landray.kmss.sys.config.loader.ContextLoaderSupport4Spring3x.initWebApplicationContext(ContextLoaderSupport4Spring3x.java:79) at com.landray.kmss.sys.config.loader.ContextLoaderSupport4Spring3x.access$1(ContextLoaderSupport4Spring3x.java:75) at com.landray.kmss.sys.config.loader.ContextLoaderSupport4Spring3x$LoadContext.initLoadContextHelper(ContextLoaderSupport4Spring3x.java:201) at com.landray.kmss.sys.config.loader.ContextLoaderSupport4Spring3x$LoadContext.initLoad(ContextLoaderSupport4Spring3x.java:190) at com.landray.kmss.sys.config.loader.ContextLoaderSupport4Spring3x.initSmartApplicationContext(ContextLoaderSupport4Spring3x.java:67) at com.landray.kmss.sys.config.loader.SpringLoader.doLoad(SpringLoader.java:36) at com.landray.kmss.framework.loader.FrameworkContextLoader.doFrameworkLoader(FrameworkContextLoader.java:122) at com.landray.kmss.framework.loader.FrameworkContextLoader.doLoadForPoint(FrameworkContextLoader.java:105) at com.landray.kmss.framework.loader.FrameworkContextLoader.doLoad(FrameworkContextLoader.java:75) at com.landray.kmss.framework.plugin.core.event.AbstractEventDefinition$VirtualLoadChain.doLoad(AbstractEventDefinition.java:294) at com.landray.kmss.framework.service.plugin.config.FromAttributeInterceptor.doLoad(FromAttributeInterceptor.java:46) at com.landray.kmss.framework.plugin.core.event.AbstractEventDefinition$VirtualLoadChain.doLoad(AbstractEventDefinition.java:294) at com.landray.kmss.framework.plugin.core.event.AbstractEventDefinition.loadDefinition(AbstractEventDefinition.java:245) at com.landray.kmss.framework.plugin.core.support.AbstractPluginFactory.getExtensionPoint(AbstractPluginFactory.java:44) at com.landray.kmss.framework.plugin.core.support.DefaultListableFactory.instantiateAllPlugin(DefaultListableFactory.java:54) at com.landray.kmss.framework.plugin.core.context.AbstractApplicationContext.refresh(AbstractApplicationContext.java:74) at com.landray.kmss.framework.plugin.core.context.AbstractConfigurableApplicationContext.refresh(AbstractConfigurableApplicationContext.java:48) at com.landray.kmss.framework.plugin.core.context.PluginContextLoader.createPluginContext(PluginContextLoader.java:74) at com.landray.kmss.framework.plugin.core.context.PluginContextLoader.initPluginContext(PluginContextLoader.java:42) at com.landray.kmss.framework.plugin.core.context.PluginContextLoader.initPluginContext(PluginContextLoader.java:32) at com.landray.kmss.framework.plugin.loader.PluginContextLoaderListener.contextInitialized(PluginContextLoaderListener.java:174) at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:5128) at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5653) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183) at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:1007) at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:983) at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:639) at org.apache.catalina.startup.HostConfig.manageApp(HostConfig.java:1898) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:302) at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819) at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801) at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:633) at org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:577) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:302) at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819) at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801) at com.sun.jmx.remote.security.MBeanServerAccessController.invoke(MBeanServerAccessController.java:468) at javax.management.remote.rmi.RMIConnectionImpl.doOperation(RMIConnectionImpl.java:1487) at javax.management.remote.rmi.RMIConnectionImpl.access$300(RMIConnectionImpl.java:97) at javax.management.remote.rmi.RMIConnectionImpl$PrivilegedOperation.run(RMIConnectionImpl.java:1328) at java.security.AccessController.doPrivileged(Native Method) at javax.management.remote.rmi.RMIConnectionImpl.doPrivilegedOperation(RMIConnectionImpl.java:1427) at javax.management.remote.rmi.RMIConnectionImpl.invoke(RMIConnectionImpl.java:848) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:322) at sun.rmi.transport.Transport$2.run(Transport.java:202) at sun.rmi.transport.Transport$2.run(Transport.java:199) at java.security.AccessController.doPrivileged(Native Method) at sun.rmi.transport.Transport.serviceCall(Transport.java:198) at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:567) at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:828) at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.access$400(TCPTransport.java:619) at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler$1.run(TCPTransport.java:684) at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler$1.run(TCPTransport.java:681) at java.security.AccessController.doPrivileged(Native Method) at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:681) 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.lang.ClassNotFoundException: com.landray.kmss.mydq.cbs.dao.impl.SycOaCbsDaoImpl at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1952) at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1795) at org.springframework.util.ClassUtils.forName(ClassUtils.java:268) at org.springframework.beans.factory.support.AbstractBeanDefinition.resolveBeanClass(AbstractBeanDefinition.java:419) at org.springframework.beans.factory.support.AbstractBeanFactory.doResolveBeanClass(AbstractBeanFactory.java:1299) at org.springframework.beans.factory.support.AbstractBeanFactory.resolveBeanClass(AbstractBeanFactory.java:1270) ... 79 more 2025-08-20 10:31:14,989 [WARN] ==== RMI TCP Connection(2)-127.0.0.1: com.alibaba.druid.pool.DruidDataSource.initCheck(1232) removeAbandoned is true, not use in production.
最新发布
08-21
首先，用户的问题是：“什么错误”，意思是“What error”。他们提供了一段错误日志，我需要分析这个错误。 错误日志显示了一个异常：`org.springframework.beans.factory.CannotLoadBeanClassException: Cannot ...
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