Question

我为应用项目创建了一个数据库，我实现了应用程序的所有窗口，当我尝试将德比数据库链接到我的项目时，它不起作用！我已经编写了几个代码来链接数据库，但仍然无法工作（起初我使用的数据库已经创建，然后我尝试将嵌入式数据库链接到我的项目，但没有）这里有什么尝试!!我错过了什么吗？

  try {  Class.forName("org.apache.derby.jdbc.EmbeddedDriver");
    Connection cnx = DriverManager.getConnection("jdbc:derby:C:\\Users\\user pc\\AppData\\Roaming\\NetBeans\\Derby\\projetihm","root","root");
    Statement stm= cnx.createStatement();
    String qst = "Select * from ROOT.USERAPP where username='"+uname.getText()+"'";
    ResultSet rst = stm.executeQuery(qst);
    if (rst.next())
         { JOptionPane.showMessageDialog(null, "Connexion successful");
                 }
    else {JOptionPane.showMessageDialog(null, "Wrong password or username"); }
 }
 catch (Exception e ) {};

我也试过这个

Try{  Connection cnx= DriverManager.getConnection("jdbc:derby://localhost:1527/projetihm","root","root");
Statement stm= cnx.newStatement();
ResultSet rst = stm.executeQuery("Select * From userapp ");
while (rst.next())
   if (rs.getString(1).equals(uname.getText()) && rst.getString(2).equals(pass.getText()))
        { JOptionPane.showMessageDialog(null, "Wrong password or username try again");
                 }
    else {JOptionPane.showMessageDialog(null, "Wrong password or username try again"); }
 }
 catch (Exception e ) {};

Answer 1

我解决了这个问题，它现在有效！

try {   
    Class.forName("org.apache.derby.jdbc.EmbeddedDriver").newInstance();
    Connection cnx = DriverManager.getConnection("jdbc:derby://localhost:1527/projetihm","root","root");
    Statement stm= cnx.createStatement();
    ResultSet rst = stm.executeQuery("Select * From userapp");
    while (rst.next())
       if (rst.getString(1).equals(uname.getText()) && rst.getString(4).equals(pass.getText()))
    {    this.setVisible(false);
        all a = new all(); a.setVisible(true);
             }
       else {JOptionPane.showMessageDialog(null, "Wrong password or username "); }

    } catch (Exception e) {  e.printStackTrace(); }

无法在netbeans上链接derby DB和我的java应用程序

1 个答案: