通过Ajax和SpringMVC向数据库添加对象

我遵循这一点，我想在数据库中插入一个用户，然后获得成功消息。我的代码成功地将对象插入数据库，但我得到一个错误：

com.mysql.jdbc.exceptions.MySQLIntegrityConstraintViolationException:Column'login'不能为null

。这是我的Ajax函数：

<script type="text/javascript">
    $(document).ready(function() {
     function doAjaxPost() {
            // get the form values
            var name = $('#name_').val();
            var prenom = $('#prenom_').val();
            var login = $('#login_').val();
            var password = $('#password_').val();
            var role = $('#role_').val();
            var enable = $('#enable_').val();
            $.ajax({
            type: "POST",
            url: "${pageContext.request.contextPath}/ajouter_user",
            data: "name_=" + name + "&prenom_=" + prenom + "&login_="+ login+ "&password_="+password+"&role_="+role + "&enable_="+enable,
            success: function(response){
            // we have the response
            $('#info').html(response);
            $('#nom_').val('');
            $('#prenom_').val('');
            $('#login_').val('');
            $('#password_').val('');
            $('#role_').val('');
            $('#enable_').val('');
            },
            error: function(e){
            alert('Error: ' + e);
            }
            });
            }
</script>

另外，我在另一个空页面中得到消息“用户已添加到列表中。”，该页面不在我的div中，其id=“info”如代码所示。有什么问题？

**//////整个例外\\**

mai 22, 2013 12:16:10 PM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet [Dispatcher] in context with path [/GestionDelegation] threw exception [Request processing failed; nested exception is org.springframework.dao.DataIntegrityViolationException: PreparedStatementCallback; SQL [insert into utilisateurs (login, password, nom, prenom,enable) values (?,?,?,?,?)]; Column 'login' cannot be null; nested exception is com.mysql.jdbc.exceptions.MySQLIntegrityConstraintViolationException: Column 'login' cannot be null] with root cause
com.mysql.jdbc.exceptions.MySQLIntegrityConstraintViolationException: Column 'login' cannot be null
    at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:931)
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:2941)
    at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1623)
    at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:1715)
    at com.mysql.jdbc.Connection.execSQL(Connection.java:3249)
    at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1268)
    at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:1541)
    at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:1455)
    at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:1440)
    at org.apache.commons.dbcp.DelegatingPreparedStatement.executeUpdate(DelegatingPreparedStatement.java:102)
    at org.springframework.jdbc.core.JdbcTemplate$2.doInPreparedStatement(JdbcTemplate.java:817)
    at org.springframework.jdbc.core.JdbcTemplate$2.doInPreparedStatement(JdbcTemplate.java:1)
    at org.springframework.jdbc.core.JdbcTemplate.execute(JdbcTemplate.java:586)
    at org.springframework.jdbc.core.JdbcTemplate.update(JdbcTemplate.java:811)
    at org.springframework.jdbc.core.JdbcTemplate.update(JdbcTemplate.java:867)
    at org.springframework.jdbc.core.JdbcTemplate.update(JdbcTemplate.java:875)
    at gestion.delegation.dao.ImplIUserDao.AddUser(ImplIUserDao.java:58)
    at gestion.delegation.service.ImplIUserService.AddUser(ImplIUserService.java:22)
    at gestion.delegation.controller.GestionUserController.addUser(GestionUserController.java:35)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    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.doPost(FrameworkServlet.java:560)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:641)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:368)
    at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:109)
    at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:83)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:380)
    at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:97)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:380)
    at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:100)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:380)
    at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:78)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:380)
    at org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:54)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:380)
    at org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:35)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:380)
    at org.springframework.security.web.authentication.www.BasicAuthenticationFilter.doFilter(BasicAuthenticationFilter.java:177)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:380)
    at org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:187)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:380)
    at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:105)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:380)
    at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:79)
    at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:380)
    at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:169)
    at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:237)
    at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:167)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:929)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1002)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:585)
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:312)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)

方法DAO

public boolean AddUser(User user) {
        boolean t=true;
        final String User_INSERT1 = "insert into utilisateurs (login, password, nom, prenom,enable) "
                + "values (?,?,?,?,?)";
        final String User_INSERT2="insert into roles (login,role) values(?,?)";
        /*
         * On récupère et on utilisera directement le jdbcTemplate
         */
        MessageDigestPasswordEncoder encoder = new MessageDigestPasswordEncoder("SHA");
        String hash = encoder.encodePassword(user.getPassword(), "");

        final String check ="select count(*) from utilisateurs where login = ?";

       int result= getJdbcTemplate().queryForInt(check, new Object[]{String.valueOf(user.getLogin())});
        if (result==0) { 
            getJdbcTemplate()
            .update(User_INSERT1,
                    new Object[] {user.getLogin(),
                            hash, user.getNom(),
                            user.getPrenom(), user.getEnable(),
                             });
    getJdbcTemplate().update(User_INSERT2, new Object[]{user.getLogin(),user.getRole()});
       return t;
        }   

        else { t = false ; return t;}

        }

---

将数据字段写为

data:{"name" : name , "prenom" : prenom , "login_" : login , "password_" :password , "role_" :role , "enable_" :enable },

代替

data: "name_=" + name + "&prenom_=" + prenom + "&login_="+ login+ "&password_="+password+"&role_="+role + "&enable_="+enable,

---

将数据字段写为

data:{"name" : name , "prenom" : prenom , "login_" : login , "password_" :password , "role_" :role , "enable_" :enable },

代替

data: "name_=" + name + "&prenom_=" + prenom + "&login_="+ login+ "&password_="+password+"&role_="+role + "&enable_="+enable,

---

您能提供整个堆栈跟踪吗？请问堆栈跟踪是什么意思？从中获取

com.mysql.jdbc.exceptions.MySQLIntegrityConstraintViolationException的异常堆栈跟踪：“login”列不能为空。您可能会从应用程序日志（也可能打印在IDE的控制台中）中获得它。是的，我编辑了我的问题，请参见上面的内容。我认为您的插入不起作用。异常似乎表明您试图在“login”列中插入空值。我只能猜测，因为您没有显示您的用户域对象，也没有显示存储过程中涉及的DAO/服务，但我猜您正在以某种方式抑制错误，这就是您收到错误成功消息的原因。您能提供整个堆栈跟踪吗？请问堆栈跟踪是什么意思？从中获取
com.mysql.jdbc.exceptions.MySQLIntegrityConstraintViolationException的异常堆栈跟踪：“login”列不能为空。您可能会从应用程序日志（也可能打印在IDE的控制台中）中获得它。是的，我编辑了我的问题，请参见上面的内容。我认为您的插入不起作用。异常似乎表明您试图在“login”列中插入空值。我只能猜测，因为您没有显示您的用户域对象，也没有显示存储过程中涉及的DAO/服务，但我猜您正在以某种方式抑制错误，这就是您收到错误成功消息的原因。