链接数据库出错了,不知道咋回事?

链接数据库出错了,不知道怎么回事??
我在index.jsp上写了一个表单

Java code

    <form action="/jdbc/servlet/Jdbc" method="post">    ID<input type="text" name="id">    NAME<input type="text" name="user">    <input type="submit" value="submit">    </form>

点击提交后转到jdbc这个servlet中处理数据库的插入:

Java code

        String id=request.getParameter("id");        String name=request.getParameter("user");        String db="com.mysql.jdbc.Driver";        String dbName="jdbc:mysql://localhost:3306/student";        String dbUser="root",dbPass="itelly";        String sql="INSERT INTO STUDENT VALUES("+id+","+name+")";        Connection connection=null;        Statement statement=null;        try {            Class.forName(db);            connection=DriverManager.getConnection(dbName, dbUser, dbPass);            statement=connection.createStatement();            statement.executeUpdate(sql);                    } catch (Exception e) {            // TODO Auto-generated catch block            e.printStackTrace();        }finally{            try {                statement.close();                connection.close();            } catch (SQLException e) {                // TODO Auto-generated catch block                e.printStackTrace();            }                                }

可是执行后数据库里面怎么没有插入成功呢?
ps.我这个数据库.用户名.密码都是正确的.

myeclipse提示:
com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Unknown column 'adf' in 'field list'
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
at com.mysql.jdbc.Util.getInstance(Util.java:386)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1052)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4096)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4028)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2490)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2651)
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2677)
at com.mysql.jdbc.StatementImpl.executeUpdate(StatementImpl.java:1748)
at com.mysql.jdbc.StatementImpl.executeUpdate(StatementImpl.java:1665)
at com.haolly.Jdbc.doPost(Jdbc.java:101)
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.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)