SSM整合的小Demo

深碍√TFBOYSˉ_ 2023-03-13 01:57 40阅读 0赞

# SSM整合的小Demo： #

## 功能点： ##

1.分页
    2.数据校验
    2.1前端(jquery)和后端校验(JSR303)
    3.ajax（新增，编辑，删除，多个删除）
    4.Rest风格的URL：使用HTTP协议请求方式的动词，来表示对资源的操作（GET(查询)，POST(新增)，PUT(修改)，DELETE(删除))

## 技术点： ##

1.基础框架—ssm(SpringMVC+Spring+MyBatis
     2. 数据库-MySQL
    3.前端框架-bootstrap快速搭建简洁美观的界面
    4.项目的依赖管理-Maven
    5.分页-pagehelper
    6.逆向工程-MyBatis Generator

## 效果 ##

*  主界面  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mjg5MzA4NQ_size_16_color_FFFFFF_t_70]
 *  新增  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mjg5MzA4NQ_size_16_color_FFFFFF_t_70 1]
 *  修改  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mjg5MzA4NQ_size_16_color_FFFFFF_t_70 2]
 *  删除单个  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mjg5MzA4NQ_size_16_color_FFFFFF_t_70 3]
 *  删除多个  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mjg5MzA4NQ_size_16_color_FFFFFF_t_70 4]

### 项目的地址：https://github.com/clover426/atguigu\_SSM ###

## 踩过的坑： ##

### 第一个： ###

![在这里插入图片描述][20200509133956245.png]

#### dispatcherServlet-servlet.xml在WEB-INF路径下 ####

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mjg5MzA4NQ_size_16_color_FFFFFF_t_70 5]

#### 必须设置为资源路径 ####

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80Mjg5MzA4NQ_size_16_color_FFFFFF_t_70 6]

### 第二个： ###

org.springframework.web.util.NestedServletException: Request processing failed; nested exception is org.springframework.jdbc.BadSqlGrammarException:

### Error querying database. Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Table ‘ssm\_crud.d’ doesn’t exist ###

### The error may exist in file \[I:\\Springmvctest\\ssm\_CRUD\\target\\classes\\mapper\\EmployeeMapper.xml\] ###

### The error may involve defaultParameterMap ###

### The error occurred while setting parameters ###

### SQL: SELECT count(0) FROM tbl\_emp e LEFT JOIN d ON e.`d_id` = d.`dept_id` ###

### Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Table ‘ssm\_crud.d’ doesn’t exist ###

; bad SQL grammar \[\]; nested exception is com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Table ‘ssm\_crud.d’ doesn’t exist

at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:982)
    at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:861)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:668)
    at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:846)
    at org.springframework.test.web.servlet.TestDispatcherServlet.service(TestDispatcherServlet.java:65)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:770)
    at org.springframework.mock.web.MockFilterChain$ServletFilterProxy.doFilter(MockFilterChain.java:167)
    at org.springframework.mock.web.MockFilterChain.doFilter(MockFilterChain.java:134)
    at org.springframework.test.web.servlet.MockMvc.perform(MockMvc.java:155)
    at com.itt.crud.test.MvcTest.testPage(MvcTest.java:45)
    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.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
    at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
    at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
    at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
    at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
    at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:75)
    at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:86)
    at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:84)
    at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:252)
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:94)
    at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
    at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
    at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
    at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
    at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
    at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
    at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70)
    at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
    at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:191)
    at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
    at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)
    at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47)
    at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)
    at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)

Caused by: org.springframework.jdbc.BadSqlGrammarException:

### Error querying database. Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Table ‘ssm\_crud.d’ doesn’t exist ###

### The error may exist in file \[I:\\Springmvctest\\ssm\_CRUD\\target\\classes\\mapper\\EmployeeMapper.xml\] ###

### The error may involve defaultParameterMap ###

### The error occurred while setting parameters ###

### SQL: SELECT count(0) FROM tbl\_emp e LEFT JOIN d ON e.`d_id` = d.`dept_id` ###

### Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Table ‘ssm\_crud.d’ doesn’t exist ###

; bad SQL grammar \[\]; nested exception is com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Table ‘ssm\_crud.d’ doesn’t exist  
at org.springframework.jdbc.support.SQLErrorCodeSQLExceptionTranslator.doTranslate(SQLErrorCodeSQLExceptionTranslator.java:231)  
at org.springframework.jdbc.support.AbstractFallbackSQLExceptionTranslator.translate(AbstractFallbackSQLExceptionTranslator.java:73)  
at org.mybatis.spring.MyBatisExceptionTranslator.translateExceptionIfPossible(MyBatisExceptionTranslator.java:73)  
at org.mybatis.spring.SqlSessionTemplate S q l S e s s i o n I n t e r c e p t o r . i n v o k e ( S q l S e s s i o n T e m p l a t e . j a v a : 446 ) a t c o m . s u n . p r o x y . SqlSessionInterceptor.invoke(SqlSessionTemplate.java:446) at com.sun.proxy. SqlSessionInterceptor.invoke(SqlSessionTemplate.java:446)atcom.sun.proxy.Proxy22.selectList(Unknown Source)  
at org.mybatis.spring.SqlSessionTemplate.selectList(SqlSessionTemplate.java:230)  
at org.apache.ibatis.binding.MapperMethod.executeForMany(MapperMethod.java:137)  
at org.apache.ibatis.binding.MapperMethod.execute(MapperMethod.java:75)  
at org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:59)  
at com.sun.proxy. P r o x y 23. s e l e c t B y E x a m p l e W i t h D e p t ( U n k n o w n S o u r c e ) a t c o m . i t t . c r u d . s e r v i c e . E m p l o y e e S e r v i c e . g e t A l l ( E m p l o y e e S e r v i c e . j a v a : 22 ) a t c o m . i t t . c r u d . s e r v i c e . E m p l o y e e S e r v i c e Proxy23.selectByExampleWithDept(Unknown Source) at com.itt.crud.service.EmployeeService.getAll(EmployeeService.java:22) at com.itt.crud.service.EmployeeService Proxy23.selectByExampleWithDept(UnknownSource)atcom.itt.crud.service.EmployeeService.getAll(EmployeeService.java:22)atcom.itt.crud.service.EmployeeService F a s t C l a s s B y S p r i n g C G L I B FastClassBySpringCGLIB FastClassBySpringCGLIB 824 f 9610. i n v o k e ( < g e n e r a t e d > ) a t o r g . s p r i n g f r a m e w o r k . c g l i b . p r o x y . M e t h o d P r o x y . i n v o k e ( M e t h o d P r o x y . j a v a : 204 ) a t o r g . s p r i n g f r a m e w o r k . a o p . f r a m e w o r k . C g l i b A o p P r o x y 824f9610.invoke(<generated>) at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204) at org.springframework.aop.framework.CglibAopProxy 824f9610.invoke(<generated>)atorg.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204)atorg.springframework.aop.framework.CglibAopProxyCglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:721)  
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157)  
at org.springframework.transaction.interceptor.TransactionInterceptor 1. p r o c e e d W i t h I n v o c a t i o n ( T r a n s a c t i o n I n t e r c e p t o r . j a v a : 99 ) a t o r g . s p r i n g f r a m e w o r k . t r a n s a c t i o n . i n t e r c e p t o r . T r a n s a c t i o n A s p e c t S u p p o r t . i n v o k e W i t h i n T r a n s a c t i o n ( T r a n s a c t i o n A s p e c t S u p p o r t . j a v a : 282 ) a t o r g . s p r i n g f r a m e w o r k . t r a n s a c t i o n . i n t e r c e p t o r . T r a n s a c t i o n I n t e r c e p t o r . i n v o k e ( T r a n s a c t i o n I n t e r c e p t o r . j a v a : 96 ) a t o r g . s p r i n g f r a m e w o r k . a o p . f r a m e w o r k . R e f l e c t i v e M e t h o d I n v o c a t i o n . p r o c e e d ( R e f l e c t i v e M e t h o d I n v o c a t i o n . j a v a : 179 ) a t o r g . s p r i n g f r a m e w o r k . a o p . i n t e r c e p t o r . E x p o s e I n v o c a t i o n I n t e r c e p t o r . i n v o k e ( E x p o s e I n v o c a t i o n I n t e r c e p t o r . j a v a : 92 ) a t o r g . s p r i n g f r a m e w o r k . a o p . f r a m e w o r k . R e f l e c t i v e M e t h o d I n v o c a t i o n . p r o c e e d ( R e f l e c t i v e M e t h o d I n v o c a t i o n . j a v a : 179 ) a t o r g . s p r i n g f r a m e w o r k . a o p . f r a m e w o r k . C g l i b A o p P r o x y 1.proceedWithInvocation(TransactionInterceptor.java:99) at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:282) 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.CglibAopProxy 1.proceedWithInvocation(TransactionInterceptor.java:99)atorg.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:282)atorg.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:96)atorg.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)atorg.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:92)atorg.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)atorg.springframework.aop.framework.CglibAopProxyDynamicAdvisedInterceptor.intercept(CglibAopProxy.java:656)  
at com.itt.crud.service.EmployeeService E n h a n c e r B y S p r i n g C G L I B EnhancerBySpringCGLIB EnhancerBySpringCGLIB20270937.getAll()  
at com.itt.crud.controller.EmployeeController.getEmps(EmployeeController.java:37)  
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.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:205)  
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:133)  
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:116)  
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:827)  
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:738)  
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85)  
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:963)  
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:897)  
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:970)  
… 38 more  
Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Table ‘ssm\_crud.d’ doesn’t exist  
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)  
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)  
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)  
at java.lang.reflect.Constructor.newInstance(Constructor.java:423)  
at com.mysql.jdbc.Util.handleNewInstance(Util.java:404)  
at com.mysql.jdbc.Util.getInstance(Util.java:387)  
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:939)  
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3878)  
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3814)  
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2478)  
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2625)  
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2551)  
at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1861)  
at com.mysql.jdbc.PreparedStatement.execute(PreparedStatement.java:1192)  
at com.mchange.v2.c3p0.impl.NewProxyPreparedStatement.execute(NewProxyPreparedStatement.java:67)  
at org.apache.ibatis.executor.statement.PreparedStatementHandler.query(PreparedStatementHandler.java:63)  
at org.apache.ibatis.executor.statement.RoutingStatementHandler.query(RoutingStatementHandler.java:79)  
at org.apache.ibatis.executor.BatchExecutor.doQuery(BatchExecutor.java:93)  
at org.apache.ibatis.executor.BaseExecutor.queryFromDatabase(BaseExecutor.java:324)  
at org.apache.ibatis.executor.BaseExecutor.query(BaseExecutor.java:156)  
at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:109)  
at com.github.pagehelper.PageInterceptor.intercept(PageInterceptor.java:111)  
at org.apache.ibatis.plugin.Plugin.invoke(Plugin.java:61)  
at com.sun.proxy. P r o x y 34. q u e r y ( U n k n o w n S o u r c e ) a t o r g . a p a c h e . i b a t i s . s e s s i o n . d e f a u l t s . D e f a u l t S q l S e s s i o n . s e l e c t L i s t ( D e f a u l t S q l S e s s i o n . j a v a : 148 ) a t o r g . a p a c h e . i b a t i s . s e s s i o n . d e f a u l t s . D e f a u l t S q l S e s s i o n . s e l e c t L i s t ( D e f a u l t S q l S e s s i o n . j a v a : 141 ) a t s u n . r e f l e c t . N a t i v e M e t h o d A c c e s s o r I m p l . i n v o k e 0 ( N a t i v e M e t h o d ) a t s u n . r e f l e c t . N a t i v e M e t h o d A c c e s s o r I m p l . i n v o k e ( N a t i v e M e t h o d A c c e s s o r I m p l . j a v a : 62 ) a t s u n . r e f l e c t . D e l e g a t i n g M e t h o d A c c e s s o r I m p l . i n v o k e ( D e l e g a t i n g M e t h o d A c c e s s o r I m p l . j a v a : 43 ) a t j a v a . l a n g . r e f l e c t . M e t h o d . i n v o k e ( M e t h o d . j a v a : 498 ) a t o r g . m y b a t i s . s p r i n g . S q l S e s s i o n T e m p l a t e Proxy34.query(Unknown Source) at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:148) at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:141) 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.mybatis.spring.SqlSessionTemplate Proxy34.query(UnknownSource)atorg.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:148)atorg.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:141)atsun.reflect.NativeMethodAccessorImpl.invoke0(NativeMethod)atsun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)atsun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)atjava.lang.reflect.Method.invoke(Method.java:498)atorg.mybatis.spring.SqlSessionTemplateSqlSessionInterceptor.invoke(SqlSessionTemplate.java:433)  
… 71 more

#### 解决的方法： ####

> 这个错误\#\#\# SQL: SELECT count(0) FROM tbl\_emp e LEFT JOIN d ON e.`d_id` = d.`dept_id`  
> 我们就知道，肯定是SQL有错误，这个的bug是在用LEFT JOIN时没有加表名，直接用了别名d才报的错！！！！！！

### 第三种： ###

> 在使用maven开发时，由于jar包版本的不同，有时候会有冲突之类的，所以在做的时候尽量的统一jar包的版本！切记！

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