大家好，又见面了，我是全栈君。
在写上篇文章《spring整合springmvc和hibernate》的时候，曾遇到一个问题
INFO: Server startup in 8102 ms Hibernate: insert into t_user (name, password) values (?, ?) Mar 31, 2018 5:47:19 PM org.apache.catalina.core.StandardWrapperValve invoke SEVERE: Servlet.service() for servlet [springmvc] in context with path [/mvn-ssh] threw exception [Request processing failed; nested exception is org.hibernate.exception.SQLGrammarException: could not insert: [com.mvn.entity.User]] with root cause java.sql.SQLSyntaxErrorException: Table 'mvn.t_user' doesn't exist at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:536) at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:513) at com.mysql.cj.jdbc.exceptions.SQLExceptionsMapping.translateException(SQLExceptionsMapping.java:115) at com.mysql.cj.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:1983) at com.mysql.cj.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1826) at com.mysql.cj.jdbc.PreparedStatement.executeUpdateInternal(PreparedStatement.java:2034) at com.mysql.cj.jdbc.PreparedStatement.executeUpdateInternal(PreparedStatement.java:1970) at com.mysql.cj.jdbc.PreparedStatement.executeLargeUpdate(PreparedStatement.java:5001) at com.mysql.cj.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:1955) at org.apache.commons.dbcp2.DelegatingPreparedStatement.executeUpdate(DelegatingPreparedStatement.java:97) at org.apache.commons.dbcp2.DelegatingPreparedStatement.executeUpdate(DelegatingPreparedStatement.java:97) at org.hibernate.id.IdentityGenerator$GetGeneratedKeysDelegate.executeAndExtract(IdentityGenerator.java:93) at org.hibernate.id.insert.AbstractReturningDelegate.performInsert(AbstractReturningDelegate.java:56) at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2346) at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2853) at org.hibernate.action.EntityIdentityInsertAction.execute(EntityIdentityInsertAction.java:71) at org.hibernate.engine.ActionQueue.execute(ActionQueue.java:273) at org.hibernate.event.def.AbstractSaveEventListener.performSaveOrReplicate(AbstractSaveEventListener.java:320) at org.hibernate.event.def.AbstractSaveEventListener.performSave(AbstractSaveEventListener.java:203) at org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:129) at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:210) at org.hibernate.event.def.DefaultSaveEventListener.saveWithGeneratedOrRequestedId(DefaultSaveEventListener.java:56) at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:195) at org.hibernate.event.def.DefaultSaveEventListener.performSaveOrUpdate(DefaultSaveEventListener.java:50) at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:93) at org.hibernate.impl.SessionImpl.fireSave(SessionImpl.java:713) at org.hibernate.impl.SessionImpl.save(SessionImpl.java:701) at org.hibernate.impl.SessionImpl.save(SessionImpl.java:697) at com.mvn.dao.UserDao.save(UserDao.java:19) at com.mvn.service.UserService.save(UserService.java:18) at com.mvn.service.UserService$$FastClassByCGLIB$$7706a99b.invoke(<generated>) at net.sf.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204) at org.springframework.aop.framework.Cglib2AopProxy$CglibMethodInvocation.invokeJoinpoint(Cglib2AopProxy.java:688) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150) at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:110) at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172) at org.springframework.aop.framework.Cglib2AopProxy$DynamicAdvisedInterceptor.intercept(Cglib2AopProxy.java:621) at com.mvn.service.UserService$$EnhancerByCGLIB$$8b9eb23e.save(<generated>) at com.mvn.controller.SaveUser.saveUser(SaveUser.java:23) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.springframework.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod(HandlerMethodInvoker.java:176) at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:426) at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:414) at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:790) at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:719) at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:644) at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:549) at javax.servlet.http.HttpServlet.service(HttpServlet.java:624) at javax.servlet.http.HttpServlet.service(HttpServlet.java:731) 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.StandardWrapperValve.invoke(StandardWrapperValve.java:218) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:505) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:169) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103) at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:956) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:442) at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1083) at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:640) at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:316) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) at java.lang.Thread.run(Thread.java:745)
说是表t_user不存在，也就是说hibernate并没有自动生成表结构，hibernate.hbm2ddl.auto=update不起作用，但是把update改为create就能自动生成。
通过在网上查询，有人说是方言错误，需要将
hibernate.dialect=org.hibernate.dialect.MySQLInnoDBDialect
改为
hibernate.dialect=org.hibernate.dialect.MySQL5Dialect
但是我本来就是这样写的，肯定是其他原因也会导致hibernate.hbm2ddl.auto=update不起作用。
终于在几乎千篇一律的文章中找到了一篇不一样的，原因是数据库中已经有相同名字的表了（可能这张表是属于别的用户）
于是我到别的里面查，果然在另外一个里面确实存在t_user表了，
![hibernate.hbm2ddl.auto=update不能自动生成表结构[通俗易懂]](http://qn.javajgs.com/20220216/f4a715d8-dfd4-493e-84fd-26d5d3e09a21202202165b2fc10f-9cd8-4cc4-9979-63964f3c79271.jpg)
![hibernate.hbm2ddl.auto=update不能自动生成表结构[通俗易懂]](https://javaforall.net/wp-content/uploads/2020/11/2020110817443450.jpg)
解决方案：
将既存t_user改为t_user1或者将这次的表名字修改下，
然后再执行这次代码，成功！！
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