java – 从JDBC数据库中检索数据到Jtable

您好我已成功将我的jTable链接到JDBC数据库.
但是,我无法检索它们.我想在重新启动程序时显示保存的数据,但它不起作用.

alarm.setText("");  
    DefaultTableModel model =(DefaultTableModel) hwList.getModel();
    if(!className.getText().trim().equals(""))
    {
        model.addRow(new Object[]{className.getText(), homeWork.getText(), dueDate.getText()});
    }
    else
    {
        alarm.setText("Class Name should not be blank.");
    }

        Connection conn;
        Statement st;

        try
    {
        String myDriver = "com.MysqL.jdbc.Driver";
        String myUrl = "jdbc:MysqL://localhost:3306/MysqL";
        Class.forName("com.MysqL.jdbc.Driver");
        System.out.println("Connecting to database");
        conn = DriverManager.getConnection("jdbc:MysqL://localhost:3306/MysqL", "root", "");
        System.out.println("Connected to databse");


        String a = className.getText();
        String b = homeWork.getText();
        String c = dueDate.getText();            

        System.out.println("Inserting into the table");
        st = conn.createStatement();
        String stmt="INSERT INTO hwList (className, homeWork, dueDate)"+ "VALUES ("+"\'"+a+"\',"+"\'"+b+"\',"+"\'"+c+"\')";
        System.out.println(stmt);
        st.executeUpdate(stmt);

        System.out.println("Saved!");

    }
    catch (Exception e)
    {
        System.err.println("Got an exception!");
        System.err.println(e.getMessage());
    }

这是我保存文档的代码！

有没有办法在JDBC数据库中检索数据并通过Jtable显示它？
我很抱歉提出这么简单的问题,但我是java新手,我迫切需要帮助！

非常感谢！

用于加载数据的代码……

顺便说一下,我的jtable是一个包含三列的3列表 – className,homeWork,dueDate.
谢谢！

String sql="SELECT * FROM hwList";
ResultSet rs = st.executeQuery(sql);
while(rs.next())
{
    String d = rs.getString("className");
    String e = rs.getString("homeWork");
    String f = rs.getString("dueDate");
}

解决方法:

首先创建一个新的TableModel ……

DefaultTableModel model = new DefaultTableModel(new String[]{"Class Name", "Home work", "Due Date"}, 0);

从数据库加载数据……

String sql="SELECT * FROM hwList";
ResultSet rs = st.executeQuery(sql);

将每行数据添加到表模型中……

while(rs.next())
{
    String d = rs.getString("className");
    String e = rs.getString("homeWork");
    String f = rs.getString("dueDate");
    model.addRow(new Object[]{d, e, f});
}

将模型应用于JTable ……

table.setModel(model);

您可能还想查看The try-with-resources Statement并确保正确管理资源

java – 从JDBC数据库中检索数据到Jtable

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