向数据库里添加时出错
老师叫做一个项目，我在做到向数据库里更新信息的时候无法更细出现以下问题：菜品名称：土豆丝
菜品规格：盘
菜品价格：12
菜品类型：中餐
2013-4-18 20:46:38 edu.sdp.cater.order.Dish addDish
严重: null
java.lang.ClassNotFoundException: com.microsoft.sqlserver.jdbc.SQLServerDriver
at (URLClassLoader.java:202)
at java.security.AccessController.doPrivileged(Native Method)
at (URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:171)
at edu.sdp.cater.order.Dish.addDish(Dish.java:40)
at edu.sdp.cater.frame.DishAddJFrame.jButton1ActionPerformed(DishAddJFrame.java:156)
at edu.sdp.cater.frame.DishAddJFrame.access$000(DishAddJFrame.java:13)
at edu.sdp.cater.frame.DishAddJFrame$1.actionPerformed(DishAddJFrame.java:65)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:236)
at java.(Component.java:6297)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3275)
at java.(Component.java:6062)
at java.awt.Container.processEvent(Container.java:2039)
at java.(Component.java:4660)
at java.awt.Container.dispatchEventImpl(Container.java:2097)
at java.(Component.java:4488)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4575)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4236)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4166)
at java.awt.Container.dispatchEventImpl(Container.java:2083)[/color]
这是怎么回事啊！！！！求大神啊！数据库是sql
