ODBC驱动程序管理器'无效字符串或缓冲区长度'错误

时间：2014-05-09 20:21:50

标签： java sql database

我正在使用我的应用程序连接数据库。 SELECT查询工作正常，这意味着建立连接。当我使用statement.execute(parameter)方法时，我可以获取在服务器上保存的信息，但是当我尝试插入新数据并使用statement.executeUpdate(parameter)方法时，会抛出我列出错误。好吧，我差不多3天就此问题卡住但发现没有任何与我的问题相关的帮助。 

java.sql.SQLException: [Microsoft][ODBC Driver Manager] Invalid string or buffer length
    at sun.jdbc.odbc.JdbcOdbc.createSQLException(Unknown Source)
    at sun.jdbc.odbc.JdbcOdbc.standardError(Unknown Source)
    at sun.jdbc.odbc.JdbcOdbc.SQLGetDataString(Unknown Source)
    at sun.jdbc.odbc.JdbcOdbcResultSet.getDataString(Unknown Source)
    at sun.jdbc.odbc.JdbcOdbcResultSet.getString(Unknown Source)
    at sun.jdbc.odbc.JdbcOdbcConnection.buildTypeInfo(Unknown Source)
    at sun.jdbc.odbc.JdbcOdbcConnection.initialize(Unknown Source)
    at sun.jdbc.odbc.JdbcOdbcDriver.connect(Unknown Source)
    at java.sql.DriverManager.getConnection(Unknown Source)
    at java.sql.DriverManager.getConnection(Unknown Source)
    at Database.Database.InitializeDatabase(Database.java:14)
    at Clients.Customer$2.actionPerformed(Customer.java:115)
    at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
    at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
    at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
    at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
    at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)
    at java.awt.AWTEventMulticaster.mouseReleased(Unknown Source)
    at java.awt.Component.processMouseEvent(Unknown Source)
    at javax.swing.JComponent.processMouseEvent(Unknown Source)
    at java.awt.Component.processEvent(Unknown Source)
    at java.awt.Container.processEvent(Unknown Source)
    at java.awt.Component.dispatchEventImpl(Unknown Source)
    at java.awt.Container.dispatchEventImpl(Unknown Source)
    at java.awt.Component.dispatchEvent(Unknown Source)
    at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
    at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
    at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
    at java.awt.Container.dispatchEventImpl(Unknown Source)
    at java.awt.Window.dispatchEventImpl(Unknown Source)
    at java.awt.Component.dispatchEvent(Unknown Source)
    at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
    at java.awt.EventQueue.access$200(Unknown Source)
    at java.awt.EventQueue$3.run(Unknown Source)
    at java.awt.EventQueue$3.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
    at java.awt.EventQueue$4.run(Unknown Source)
    at java.awt.EventQueue$4.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
    at java.awt.EventQueue.dispatchEvent(Unknown Source)
    at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
    at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
    at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
    at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
    at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
    at java.awt.EventDispatchThread.run(Unknown Source)
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
    at Database.Database.executeQuery(Database.java:26)
    at Clients.Customer.saveData(Customer.java:141)
    at Clients.Customer$2.actionPerformed(Customer.java:116)
    at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
    at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
    at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
    at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
    at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)
    at java.awt.AWTEventMulticaster.mouseReleased(Unknown Source)
    at java.awt.Component.processMouseEvent(Unknown Source)
    at javax.swing.JComponent.processMouseEvent(Unknown Source)
    at java.awt.Component.processEvent(Unknown Source)
    at java.awt.Container.processEvent(Unknown Source)
    at java.awt.Component.dispatchEventImpl(Unknown Source)
    at java.awt.Container.dispatchEventImpl(Unknown Source)
    at java.awt.Component.dispatchEvent(Unknown Source)
    at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
    at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
    at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
    at java.awt.Container.dispatchEventImpl(Unknown Source)
    at java.awt.Window.dispatchEventImpl(Unknown Source)
    at java.awt.Component.dispatchEvent(Unknown Source)
    at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
    at java.awt.EventQueue.access$200(Unknown Source)
    at java.awt.EventQueue$3.run(Unknown Source)
    at java.awt.EventQueue$3.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
    at java.awt.EventQueue$4.run(Unknown Source)
    at java.awt.EventQueue$4.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(Unknown Source)
    at java.awt.EventQueue.dispatchEvent(Unknown Source)
    at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
    at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
    at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
    at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
    at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
    at java.awt.EventDispatchThread.run(Unknown Source)

非常特别，我可以看到我的问题在这里或可能不是。但是我无法弄清楚它为什么会给NullPointerException。

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
    at Database.Database.executeQuery(Database.java:26)
    at Clients.Customer.saveData(Customer.java:141)

这是我尝试执行查询的代码

public void saveData(){
             if(!repOK()){
                JOptionPane.showMessageDialog(null, "One or more mendetory fields are empty","Error",JOptionPane.WARNING_MESSAGE);
             }
             else{
                 database.executeQuery("INSERT INTO CustomerList(customerCode,customerName,resourcePerson,balance,mobile,landline) VALUES('"+customerCodeF.getText()+"','"+customerNameF.getText()+"','"+resourcePersonF.getText()+"','"+balanceF.getText()+"','"+mobileF.getText()+"','"+landLineF.getText()+"')");        
                 JOptionPane.showMessageDialog(null,"Data Saved");
                 createCustomertable();
                 resetForm();
             }
    }

注意：此方法在保存按钮的actionListener中调用。

public void actionPerformed(ActionEvent e){
                database.InitializeDatabase("Rimco");
                saveData();
                database.closeDatabase();
            }

以下是我的Database类中用于执行查询的片段。

public void executeQuery(String query){
        try {
            //statement.executeUpdate(query);
            PreparedStatement p= connection.prepareStatement(query);
            p.executeUpdate();
        } catch (SQLException e) {
            e.printStackTrace();
        }           
    }

首先，我尝试使用executeUpdate(query);来完成工作但出现了同样的错误。然后我切换到PreparedStatment但没有发生任何事情，同样的错误仍然存​​在。

任何想法都会有很大的帮助。 非常感谢！

1 个答案:

答案 0 :(得分：0)

我猜你对文本字段的一个引用是null，所以当你这样做时 base.executeQuery("INSERT INTO CustomerList(customerCode,customerName,resourcePerson,balance,mobile,landline) VALUES('"+customerCodeF.getText()+"','"+customerNameF.getText()+"','"+resourcePersonF.getText()+"','"+balanceF.getText()+"','"+mobileF.getText()+"','"+landLineF.getText()+".....

你可能通过在一个你认为是对文本字段的引用的空值上调用getText（）来抛出一个NPE。

您可能会发现在调试器中单步调试代码会很有帮助。

哦，你真的不应该将原始用户提供的文本输入连接到你的sql语句 - 而是将参数绑定到预准备语句。搜索“SQL Injection”或“Little Bobby Tables”以找出原因......

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