HTTP Status 500 - Request processing failed; nested exception is org.springframework.jdbc.BadSqlGram
type Exception report
message Request processing failed; nested exception is org.springframework.jdbc.BadSqlGrammarException:
description The server encountered an internal error that prevented it from fulfilling this request.
exception
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: Unknown column 'STATUS' in 'field list'
### The error may exist in URL [jar:file:/F:/workForder/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps/xinghe-web/WEB-INF/lib/xinghe-base-0.0.1-SNAPSHOT.jar!/com/xinghe/base/model/mapper/TeacherMapper.xml]
### The error may involve defaultParameterMap
### The error occurred while setting parameters
### SQL: SELECT ID , TEACHER_NAME, TEACHER_TITLE_ID , SCHOOL_ID , DEPARTMENT , JOB , USER_ID , CREATE_TIME , UPDATE_TIME , SEX , BIRTHDAY , BIRTH_ADDRESS , NATIVE_PLACE , NATION , NATIONALITY_ID , AREA_ID , HUKOUSER_LOCUS , HUKOUSER_TYPE , IDCARD_TYPE , ID_NO , ID_EXPIRY_DATE , USER_TYPE_CODE , POLITICAL_STATUS , HEALTH_CONDITION , TAGS , DESCRIPTION , PLAT_MARK , STATUS , (select TRUE_NAME from auth_user u where u.ID = t.USER_ID) TRUE_NAME, (select PHOTO from auth_user u where u.ID = t.USER_ID) PHOTO FROM xg_teacher t WHERE ID IN (SELECT OBJECT_ID FROM (SELECT OBJECT_ID FROM xg_recommend WHERE REC_TYPE = 0 ORDER BY CREATE_TIME LIMIT 5) AS r) ;
### Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Unknown column 'STATUS' in 'field list'
; bad SQL grammar []; nested exception is com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Unknown column 'STATUS' in 'field list'
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:965)
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:844)
javax.servlet.http.HttpServlet.service(HttpServlet.java:620)
org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:829)
javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
com.auth.filter.AuthorizationFilter.doFilterInternal(AuthorizationFilter.java:77)
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:106)
org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:343)
org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:260)
com.auth.filter.AuthenticationFilter.doFilterInternal(AuthenticationFilter.java:111)
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:106)
org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:343)
org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:260)
org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:106)
root cause
org.springframework.jdbc.BadSqlGrammarException:
### Error querying database. Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Unknown column 'STATUS' in 'field list'
### The error may exist in URL [jar:file:/F:/workForder/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps/xinghe-web/WEB-INF/lib/xinghe-base-0.0.1-SNAPSHOT.jar!/com/xinghe/base/model/mapper/TeacherMapper.xml]
### The error may involve defaultParameterMap
### The error occurred while setting parameters
### SQL: SELECT ID , TEACHER_NAME, TEACHER_TITLE_ID , SCHOOL_ID , DEPARTMENT , JOB , USER_ID , CREATE_TIME , UPDATE_TIME , SEX , BIRTHDAY , BIRTH_ADDRESS , NATIVE_PLACE , NATION , NATIONALITY_ID , AREA_ID , HUKOUSER_LOCUS , HUKOUSER_TYPE , IDCARD_TYPE , ID_NO , ID_EXPIRY_DATE , USER_TYPE_CODE , POLITICAL_STATUS , HEALTH_CONDITION , TAGS , DESCRIPTION , PLAT_MARK , STATUS , (select TRUE_NAME from auth_user u where u.ID = t.USER_ID) TRUE_NAME, (select PHOTO from auth_user u where u.ID = t.USER_ID) PHOTO FROM xg_teacher t WHERE ID IN (SELECT OBJECT_ID FROM (SELECT OBJECT_ID FROM xg_recommend WHERE REC_TYPE = 0 ORDER BY CREATE_TIME LIMIT 5) AS r) ;
### Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Unknown column 'STATUS' in 'field list'
; bad SQL grammar []; nested exception is com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Unknown column 'STATUS' in 'field list'
org.springframework.jdbc.support.SQLErrorCodeSQLExceptionTranslator.doTranslate(SQLErrorCodeSQLExceptionTranslator.java:237)
org.springframework.jdbc.support.AbstractFallbackSQLExceptionTranslator.translate(AbstractFallbackSQLExceptionTranslator.java:72)
org.mybatis.spring.MyBatisExceptionTranslator.translateExceptionIfPossible(MyBatisExceptionTranslator.java:73)
org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:371)
com.sun.proxy.$Proxy12.selectList(Unknown Source)
org.mybatis.spring.SqlSessionTemplate.selectList(SqlSessionTemplate.java:191)
com.xinghe.base.dao.TeacherDao.teacherRecommendSelect(TeacherDao.java:49)
com.xinghe.base.service.TeacherManager.teacherRecommendSelect(TeacherManager.java:44)
com.xinghe.base.service.TeacherManager$$FastClassBySpringCGLIB$$6d3f88cd.invoke(<generated>)
org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204)
org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:700)
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:96)
org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:260)
org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:94)
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:633)
com.xinghe.base.service.TeacherManager$$EnhancerBySpringCGLIB$$9d3443c0.teacherRecommendSelect(<generated>)
com.xinghe.base.action.TeacherPublic.teacherRecommendSelect(TeacherPublic.java:37)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
java.lang.reflect.Method.invoke(Unknown Source)
org.springframework.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod(HandlerMethodInvoker.java:176)
org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:440)
org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:428)
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:919)
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:851)
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:953)
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:844)
javax.servlet.http.HttpServlet.service(HttpServlet.java:620)
org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:829)
javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
com.auth.filter.AuthorizationFilter.doFilterInternal(AuthorizationFilter.java:77)
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:106)
org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:343)
org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:260)
com.auth.filter.AuthenticationFilter.doFilterInternal(AuthenticationFilter.java:111)
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:106)
org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:343)
org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:260)
org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:106)
root cause
com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Unknown column 'STATUS' in 'field list'
sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
java.lang.reflect.Constructor.newInstance(Unknown Source)
com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
com.mysql.jdbc.Util.getInstance(Util.java:386)
com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1053)
com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4096)
com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4028)
com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2490)
com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2651)
com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2734)
com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:2155)
com.mysql.jdbc.PreparedStatement.execute(PreparedStatement.java:1379)
com.mchange.v2.c3p0.impl.NewProxyPreparedStatement.execute(NewProxyPreparedStatement.java:989)
sun.reflect.GeneratedMethodAccessor48.invoke(Unknown Source)
sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
java.lang.reflect.Method.invoke(Unknown Source)
org.apache.ibatis.logging.jdbc.PreparedStatementLogger.invoke(PreparedStatementLogger.java:62)
com.sun.proxy.$Proxy18.execute(Unknown Source)
org.apache.ibatis.executor.statement.PreparedStatementHandler.query(PreparedStatementHandler.java:59)
org.apache.ibatis.executor.statement.RoutingStatementHandler.query(RoutingStatementHandler.java:73)
org.apache.ibatis.executor.SimpleExecutor.doQuery(SimpleExecutor.java:60)
org.apache.ibatis.executor.BaseExecutor.queryFromDatabase(BaseExecutor.java:267)
org.apache.ibatis.executor.BaseExecutor.query(BaseExecutor.java:137)
org.apache.ibatis.executor.BaseExecutor.query(BaseExecutor.java:120)
sun.reflect.GeneratedMethodAccessor43.invoke(Unknown Source)
sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
java.lang.reflect.Method.invoke(Unknown Source)
org.apache.ibatis.plugin.Invocation.proceed(Invocation.java:49)
com.xinghe.mybatis.FlushCacheInterceptor.intercept(FlushCacheInterceptor.java:61)
org.apache.ibatis.plugin.Plugin.invoke(Plugin.java:60)
com.sun.proxy.$Proxy16.query(Unknown Source)
sun.reflect.GeneratedMethodAccessor43.invoke(Unknown Source)
sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
java.lang.reflect.Method.invoke(Unknown Source)
org.apache.ibatis.plugin.Invocation.proceed(Invocation.java:49)
com.xinghe.mybatis.OffsetLimitInterceptor.intercept(OffsetLimitInterceptor.java:55)
org.apache.ibatis.plugin.Plugin.invoke(Plugin.java:60)
com.sun.proxy.$Proxy16.query(Unknown Source)
org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:108)
org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:102)
org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:98)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
java.lang.reflect.Method.invoke(Unknown Source)
org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:358)
com.sun.proxy.$Proxy12.selectList(Unknown Source)
org.mybatis.spring.SqlSessionTemplate.selectList(SqlSessionTemplate.java:191)
com.xinghe.base.dao.TeacherDao.teacherRecommendSelect(TeacherDao.java:49)
com.xinghe.base.service.TeacherManager.teacherRecommendSelect(TeacherManager.java:44)
com.xinghe.base.service.TeacherManager$$FastClassBySpringCGLIB$$6d3f88cd.invoke(<generated>)
org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204)
org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:700)
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)
org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:96)
org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:260)
org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:94)
org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)
org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:633)
com.xinghe.base.service.TeacherManager$$EnhancerBySpringCGLIB$$9d3443c0.teacherRecommendSelect(<generated>)
com.xinghe.base.action.TeacherPublic.teacherRecommendSelect(TeacherPublic.java:37)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
java.lang.reflect.Method.invoke(Unknown Source)
org.springframework.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod(HandlerMethodInvoker.java:176)
org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:440)
org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:428)
org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:919)
org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:851)
org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:953)
org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:844)
javax.servlet.http.HttpServlet.service(HttpServlet.java:620)
org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:829)
javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
com.auth.filter.AuthorizationFilter.doFilterInternal(AuthorizationFilter.java:77)
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:106)
org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:343)
org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:260)
com.auth.filter.AuthenticationFilter.doFilterInternal(AuthenticationFilter.java:111)
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:106)
org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:343)
org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:260)
org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:88)
org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:106)
note The full stack trace of the root cause is available in the Apache Tomcat/7.0.54 logs.
Apache Tomcat/7.0.54
看错误提示,涉及到了SQL语句。这明显就是SQL语句与数据库表结构不统一导致的问题。
Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Unknown column 'STATUS' in 'field list'
原因:未知的字段“STATUS”,表中缺少字段。
HTTP Status 500 - Request processing failed; nested exception is org.springframework.jdbc.BadSqlGram的更多相关文章
- HTTP Status 500 - Request processing failed; nested exception is org.hibernate.exception.GenericJDBCException: could not execute statement
1.什么操作出现:当我在项目中添加产品或者修改时,浏览器出现HTTP Status 500 - Request processing failed; nested exception is org.h ...
- HTTP Status 500 - Request processing failed; nested exception is java.lang.NullPointerException
HTTP Status 500 - Request processing failed; nested exception is java.lang.NullPointerException type ...
- SpringMvc错误:HTTP Status 500 - Request processing failed; nested exception is org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.reflection.ReflectionException: There is n
HTTP Status 500 - Request processing failed; nested exception is org.mybatis.spring.MyBatisSystemExc ...
- HTTP Status 500 - Request processing failed; nested exception is java.lang.IllegalArgumentException: Control character in cookie value or attribute.
HTTP Status 500 - Request processing failed; nested exception is java.lang.IllegalArgumentException: ...
- org.springframework.web.util.NestedServletException: Request processing failed; nested exception is org.springframework.jdbc.BadSqlGrammarException: Unknown column 'viewpoint' in 'field list'
问题描述:当我在model中添加了一下代码以后数据库报错: 添加的代码为: private Viewpoint viewpoint; public Viewpoint getViewpoint() { ...
- HTTP Status 500 - Request processing failed; nested exception is org.apache.ibatis.binding.BindingException: Invalid bound statement (not found)
今天整合ssm框架 时 遇到的问题 困扰我好长时间 原因就是 mapper文件 没有被加载进来 但是 为什么没有被加载进来呢 因为中间的配置文件出了一些问题 网上大多数说法是 在pom ...
- SSM框架报HTTP Status 500 - Request processing failed; nested exception is java.lang.NullPointerException错
如下图 一番排查之后发现原来是server层写漏注释了 粗心大意,一天内出现两次写漏注释,SSM框架有意思.
- HTTP Status 500 - Request processing failed; nested exception is org.apache.ibatis.binding.BindingException
在使用Maven工程管理工具整合SSM框架时,Mybatis使用逆向工程生成的pojo,mapper接口及映射文件,把mapper接口和映射文件放在DAO工程的同一级src/main/java目录下. ...
- 报错 500 - Request processing failed; nested exception is com.alibaba.dubbo.rpc.RpcException的解决放案
版权声明:本文为博主原创文章,遵循 CC 4.0 BY-SA 版权协议,转载请附上原文出处链接和本声明.本文链接:https://blog.csdn.net/loveliness_peri/artic ...
随机推荐
- uva 10129
主要是求能否形成联通的欧拉回路 并查集+ 欧拉回路判断 一开始用dfs判断联通,死活A不出来,Wa了好多次………哭…… 并查集一次就AC了 感觉还是并查集代码好写一点, 因为dfs还要判断入口在哪里… ...
- leetcode Sum Root to Leaf Numbers(所有路径之和)
转载请注明来自souldak,微博:@evagle 观察题目给的返回值类型是int,可以断定这棵树的高度不会超过10,所以数据量其实是非常小的.那就直接dfs遍历这棵树,然后到叶子节点的时候将值加到最 ...
- ZOJ 2679 Old Bill(数学)
主题链接:problemCode=2679" target="_blank">http://acm.zju.edu.cn/onlinejudge/showProbl ...
- Net线程安全集合
在看Supersocket源码的时候发现很多地方都用到了我们不是很常用的线程安全集合,这些都是由net优化后的线程安全集合因此 应该比我们常规lock来效率好一些 比如说: 1 CurrentStac ...
- vc 按钮自绘
按钮自绘,将按钮区域分成三部分,左边.右边.中间都由贴图绘制,可用于手动进度条按钮,或者左右选择项按钮 cpp代码部分: // LRSkinButton.cpp : implementation fi ...
- A Very Easy Triangle Counting Game
题意:在圆上取n个点,相邻两个点之间连线,(注意,n和1相邻),然后所有点对(i ,i+2)相连,问能形成的不同的三角形有多少个? 思路:找规律 n=3,cnt=1; n=4,cnt=8; n=5 c ...
- CF 327D - Block Tower 数学题 DFS 初看很难,想通了就感觉很简单
D. Block Tower time limit per test 2 seconds memory limit per test 256 megabytes input standard inpu ...
- 修改Hosts文件
Hosts文件是一个用于存储计算机网络中节点信息的文件,它可以将主机名映射到相应的IP地址,实现DNS的功能,它可以由计算机的用户进行控制. Hosts文件的存储位置在不同的操作系统中并不相同,甚至不 ...
- 学习笔记之TCP/IP协议分层与OSI參考模型
1.协议的分层 ISO在制定标准化OSI之前,对网络体系结构相关的问题进行了充分的讨论, 终于提出了作为通信协议设计指标的OSI參考模型.这一模型将通信协议中必要 的功能分成了7层.通过这些 ...
- Swift - 下标脚本方法介绍及实例
定义下标脚本之后,可以使用“[]”来存取数据类型的值. 示例1:实现一个我们自定的字符串类,可以方便的通过索引获取某一个字符值,或某一部分字符串.同时也可以通过索引,给某一部分赋值. 1 2 3 4 ...