Caused by: java.sql.SQLException: Operand should contain 1 column(s)
1、错误描述
- [ERROR:]2015-05-05 15:48:55,847 [异常拦截]
- org.hibernate.exception.DataException: error executing work
- at org.hibernate.exception.internal.SQLStateConversionDelegate.convert(SQLStateConversionDelegate.java:135)
- at org.hibernate.exception.internal.StandardSQLExceptionConverter.convert(StandardSQLExceptionConverter.java:49)
- at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:126)
- at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:112)
- at org.hibernate.engine.jdbc.internal.JdbcCoordinatorImpl.coordinateWork(JdbcCoordinatorImpl.java:318)
- at org.hibernate.internal.SessionImpl.doWork(SessionImpl.java:2059)
- at org.hibernate.internal.SessionImpl.doReturningWork(SessionImpl.java:2055)
- 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.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:317)
- at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:190)
- at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157)
- at org.springframework.aop.framework.adapter.AfterReturningAdviceInterceptor.invoke(AfterReturningAdviceInterceptor.java:52)
- 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:207)
- at com.sun.proxy.$Proxy31.queryTabDetail(Unknown Source)
- 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.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:215)
- at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:132)
- at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:104)
- at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:749)
- at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:689)
- at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:83)
- at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:938)
- at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:870)
- at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:961)
- at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:863)
- at javax.servlet.http.HttpServlet.service(HttpServlet.java:646)
- at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:837)
- at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
- at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
- at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
- at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
- at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
- at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
- at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
- at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
- at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
- at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
- at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
- at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
- at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
- at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
- at org.apache.shiro.web.servlet.ProxiedFilterChain.doFilter(ProxiedFilterChain.java:61)
- at org.apache.shiro.web.servlet.AdviceFilter.executeChain(AdviceFilter.java:108)
- at org.apache.shiro.web.servlet.AdviceFilter.doFilterInternal(AdviceFilter.java:137)
- at org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:125)
- at org.apache.shiro.web.servlet.ProxiedFilterChain.doFilter(ProxiedFilterChain.java:66)
- at org.apache.shiro.web.servlet.AbstractShiroFilter.executeChain(AbstractShiroFilter.java:449)
- at org.apache.shiro.web.servlet.AbstractShiroFilter$1.call(AbstractShiroFilter.java:365)
- at org.apache.shiro.subject.support.SubjectCallable.doCall(SubjectCallable.java:90)
- at org.apache.shiro.subject.support.SubjectCallable.call(SubjectCallable.java:83)
- at org.apache.shiro.subject.support.DelegatingSubject.execute(DelegatingSubject.java:383)
- at org.apache.shiro.web.servlet.AbstractShiroFilter.doFilterInternal(AbstractShiroFilter.java:362)
- at org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:125)
- at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:344)
- at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:261)
- at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
- at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
- at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
- at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
- at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501)
- at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
- at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
- at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950)
- at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
- at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
- at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1070)
- at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:611)
- at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:316)
- at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
- at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
- at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
- at java.lang.Thread.run(Thread.java:745)
- Caused by: java.sql.SQLException: Operand should contain 1 column(s)
- at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1074)
- at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4074)
- at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4006)
- at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2468)
- at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2629)
- at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2719)
- at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:2155)
- at com.mysql.jdbc.PreparedStatement.executeQuery(PreparedStatement.java:2318)
- at org.apache.commons.dbcp.DelegatingPreparedStatement.executeQuery(DelegatingPreparedStatement.java:92)
- at org.hibernate.jdbc.WorkExecutor.executeReturningWork(WorkExecutor.java:72)
- at org.hibernate.internal.SessionImpl$3.accept(SessionImpl.java:2052)
- at org.hibernate.engine.jdbc.internal.JdbcCoordinatorImpl.coordinateWork(JdbcCoordinatorImpl.java:313)
- ... 82 more
- org.springframework.web.util.NestedServletException: Request processing failed; nested exception is org.hibernate.exception.DataException: error executing work
- at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:973)
- at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:863)
- at javax.servlet.http.HttpServlet.service(HttpServlet.java:646)
- at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:837)
- at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
- at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
- at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
- at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
- at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
- at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
- at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
- at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
- at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
- at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
- at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
- at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
- at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
- at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
- at org.apache.shiro.web.servlet.ProxiedFilterChain.doFilter(ProxiedFilterChain.java:61)
- at org.apache.shiro.web.servlet.AdviceFilter.executeChain(AdviceFilter.java:108)
- at org.apache.shiro.web.servlet.AdviceFilter.doFilterInternal(AdviceFilter.java:137)
- at org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:125)
- at org.apache.shiro.web.servlet.ProxiedFilterChain.doFilter(ProxiedFilterChain.java:66)
- at org.apache.shiro.web.servlet.AbstractShiroFilter.executeChain(AbstractShiroFilter.java:449)
- at org.apache.shiro.web.servlet.AbstractShiroFilter$1.call(AbstractShiroFilter.java:365)
- at org.apache.shiro.subject.support.SubjectCallable.doCall(SubjectCallable.java:90)
- at org.apache.shiro.subject.support.SubjectCallable.call(SubjectCallable.java:83)
- at org.apache.shiro.subject.support.DelegatingSubject.execute(DelegatingSubject.java:383)
- at org.apache.shiro.web.servlet.AbstractShiroFilter.doFilterInternal(AbstractShiroFilter.java:362)
- at org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:125)
- at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:344)
- at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:261)
- at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
- at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
- at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
- at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
- at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501)
- at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
- at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
- at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950)
- at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
- at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
- at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1070)
- at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:611)
- at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:316)
- at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
- at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
- at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
- at java.lang.Thread.run(Thread.java:745)
- Caused by: org.hibernate.exception.DataException: error executing work
- at org.hibernate.exception.internal.SQLStateConversionDelegate.convert(SQLStateConversionDelegate.java:135)
- at org.hibernate.exception.internal.StandardSQLExceptionConverter.convert(StandardSQLExceptionConverter.java:49)
- at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:126)
- at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:112)
- at org.hibernate.engine.jdbc.internal.JdbcCoordinatorImpl.coordinateWork(JdbcCoordinatorImpl.java:318)
- at org.hibernate.internal.SessionImpl.doWork(SessionImpl.java:2059)
- at org.hibernate.internal.SessionImpl.doReturningWork(SessionImpl.java:2055)
- 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.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:317)
- at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:190)
- at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157)
- at org.springframework.aop.framework.adapter.AfterReturningAdviceInterceptor.invoke(AfterReturningAdviceInterceptor.java:52)
- 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:207)
- at com.sun.proxy.$Proxy31.queryTabDetail(Unknown Source)
- 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.springframework.web.method.support.InvocableHandlerMethod.invoke(InvocableHandlerMethod.java:215)
- at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:132)
- at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:104)
- at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:749)
- at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:689)
- at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:83)
- at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:938)
- at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:870)
- at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:961)
- ... 50 more
- Caused by: java.sql.SQLException: Operand should contain 1 column(s)
- at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1074)
- at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4074)
- at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4006)
- at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2468)
- at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2629)
- at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2719)
- at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:2155)
- at com.mysql.jdbc.PreparedStatement.executeQuery(PreparedStatement.java:2318)
- at org.apache.commons.dbcp.DelegatingPreparedStatement.executeQuery(DelegatingPreparedStatement.java:92)
- at org.hibernate.jdbc.WorkExecutor.executeReturningWork(WorkExecutor.java:72)
- at org.hibernate.internal.SessionImpl$3.accept(SessionImpl.java:2052)
- at org.hibernate.engine.jdbc.internal.JdbcCoordinatorImpl.coordinateWork(JdbcCoordinatorImpl.java:313)
- ... 82 more
- [ERROR:]2015-05-05 15:48:55,869 [org.springframework.web.util.NestedServletException: Request processing failed; nested exception is org.hibernate.exception.DataException: error executing work]
2、错误原因
在进行SQL语句拼接时,有in拼接,但是在拼接的过程中出现错误:
if(!Common.empty(user.getUserId())
{
sql.append(" and t.user_id = (").append(user.getUserId()).append(") ");
}
3、解决办法
if(!Common.empty(user.getUserId())
{
sql.append(" and t.user_id in (").append(user.getUserId()).append(") ");
}
Caused by: java.sql.SQLException: Operand should contain 1 column(s)的更多相关文章
- Caused by: java.sql.SQLException: Incorrect integer value: '' for column 'clientId' at row 41
1.错误描述 [ERROR:]2015-06-10 13:48:26,253 [异常拦截] oa.exception.ExceptionHandler org.hibernate.exception. ...
- Caused by: java.sql.SQLException: Couldn't perform the operation getAutoCommit: You can't perform any operations on this connection. It has been automatically closed by Proxool for some reason (see lo
系统启动,一段时间不操作,然后在来操作时,报错如下: Caused by: java.sql.SQLException: Couldn't perform the operation getAutoC ...
- Caused by: java.sql.SQLException: ResultSet is from UPDATE. No Data.
1.错误描述 org.hibernate.exception.GenericJDBCException: error executing work at org.hibernate.exception ...
- Caused by: java.sql.SQLException: Field 'id' doesn't have a default value
1.错误描述 org.hibernate.exception.GenericJDBCException: error executing work at org.hibernate.exception ...
- Caused by: java.sql.SQLException: Parameter index out of range (1 > number of parameters, which is 0
1.错误描述 [ERROR:]2015-05-05 16:35:50,664 [异常拦截] org.hibernate.exception.GenericJDBCException: error ex ...
- Caused by:java.sql.SQLException:ORA-01008:并非所有变量都已绑定
1.错误描述 Caused by:java.sql.SQLException:ORA-01008:并非所有变量都已绑定 2.错误原因 3.解决办法
- Caused by:java.sql.SQLException:ORA-00923
1.错误描述 Caused by:java.sql.SQLException:ORA-00923:未找到要求的FROM关键字 2.错误原因 拼接SQL语句时缺少FROM什么表,导致出错 3.解决办法 ...
- 异常:Caused by: java.sql.SQLException: Field 'cust_id' doesn't have a default value
异常: 由Java.q.L.SqLExpExt引起:字段“CuSTyID”没有默认值 Caused by: java.sql.SQLException: Field 'cust_id' doesn't ...
- Caused by: java.sql.SQLException: Value '0000-00-00 00:00:00' can not be represented as java.sql.Timestamp
错误信息如下: Caused by: java.sql.SQLException: Value '0000-00-00 00:00:00' can not be represented as java ...
随机推荐
- HTA基础
HTA是HTML应用程序(HTML Application)的缩写,可以使用HTML中的绝大多数标签.脚本等.直接将HTML保存成HTA的格式,就是一个能够独立运行的应用软件. 与普通HTML网页相比 ...
- [Manacher]【学习笔记】
终于填坑啦......马拉车 课件上说的好短,但是明白了,讲解稍微修改一下抄上行了,比扩展KMP好写多了 求以每个字符为中心的最长回文串的半径.如果要求可以以字符间隙为回文中心,就要在每两个字符之间及 ...
- getHibernateTemplate() VS getSession()
如题所示,对于这个问题,官网文档已给出答案,详见: /** * Obtain a Hibernate Session, either from the current transaction or * ...
- 在window上安装redis
redis没有官方的windows版本,如果需要在windows安装可以下载由微软维护的redis(https://github.com/MicrosoftArchive/redis). 在这里我们采 ...
- PHP 支持8种基本的数据类型
四种标量类型: boolean (布尔型):这是最简单的类型,只有两种取值,可以为 TRUE/true 或 FALSE/false ,不区分大小写.详细请查看:PHP布尔类型(boolean)inte ...
- 初识vps,域名与购买,初步配置
终于还是到了这一天,不管我们是不是程序员,当我们想拥有自己的一个的博客,当我们想有自己的一个空间,当我们想在网上有一个自己可以随心所欲编写任何不被限制的仅仅是酷炫的效果,当我们想收录自己的技术,经历, ...
- Socket网络通信之数据传递
Socket通信的步骤: 1.创建ServerSocket和Socket 2.打开连接到Socket的输入/输出流 3.按照协议对Socket进行读/写操作 4.关闭输入输出流.关闭Socket 服务 ...
- MySql主键自动生成,表、实体、C#调用方法
1.表:mysql建表语句 DROP TABLE IF EXISTS `keycode`; CREATE TABLE `keycode` ( `Id` ) NOT NULL AUTO_INCREMEN ...
- Windows Server 2016-图形化备份域控制器
上边几章节我们补充了有关Windows Server 2016系统层面的相关内容,本章切回Active Directory正题,继续围绕AD域相关内容进行不断梳理补充.Windows Server B ...
- 机器学习之支持向量机(二):SMO算法
注:关于支持向量机系列文章是借鉴大神的神作,加以自己的理解写成的:若对原作者有损请告知,我会及时处理.转载请标明来源. 序: 我在支持向量机系列中主要讲支持向量机的公式推导,第一部分讲到推出拉格朗日对 ...