使用矢量矢量的JDBC数据库java

Question

有人可以通过创建矢量数据库查询来帮助我吗？

我想查询nordwind数据库的Lieferranten表并在JTable上显示它。

我的问题是如何显示数据集在jTable1？

这是我以前的代码：

import java.awt.*; 
import java.awt.event.*; 
import javax.swing.*; 
import javax.swing.event.*; 
import javax.swing.table.*; 
import java.sql.*; 
import java.util.*; 



    public class Anzeige extends JFrame { 




    private JTable jTable1 = new JTable(5, 5); 
    private DefaultTableModel jTable1Model = (DefaultTableModel) jTable1.getModel(); 
    private JScrollPane jTable1ScrollPane = new JScrollPane(jTable1); 



public Anzeige (String title) { 
    super (title); 
    setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE); 
    int frameWidth = 676; 
    int frameHeight = 467; 
    setSize(frameWidth, frameHeight); 
    Dimension d = Toolkit.getDefaultToolkit().getScreenSize(); 
    int x = (d.width - getSize().width)/2; 
    int y = (d.height - getSize().height)/2; 
    setLocation(x, y); 
    Container cp = getContentPane(); 
    cp.setLayout(null); 


    // Anfang Komponenten 
    jTable1ScrollPane.setBounds(72, 56, 521, 289); 
    jTable1.getColumnModel().getColumn(0).setHeaderValue("Title 1"); 
    jTable1.getColumnModel().getColumn(1).setHeaderValue("Title 2"); 
    jTable1.getColumnModel().getColumn(2).setHeaderValue("Title 3"); 
    jTable1.getColumnModel().getColumn(3).setHeaderValue("Title 4"); 
    jTable1.getColumnModel().getColumn(4).setHeaderValue("Title 5"); 
    cp.add(jTable1ScrollPane); 
    // Ende Komponenten 
    setResizable(false); 
    setVisible(true); 



} 



public static void main(String[] args) { 
new Anzeige("Anzeige"); 



    try { 
    Class.forName("com.mysql.jdbc.Driver").newInstance(); 

    Connection dbConn = DriverManager.getConnection("jdbc:mysql://localhost:3306/nordwind", "root", ""); 

    Statement statement = dbConn.createStatement(); 

    ResultSet results = statement.executeQuery("SELECT * FROM Lieferranten"); 

    Vector vector = new Vector(); 



    while (results.next()) { 
    String s1 = results.getString(2); 
    String s2 = results.getString(5); 
    System.out.println(s1 + "\n" + s2); 
    System.out.println(results.getString(2) + " " + results.getString(5)); 

    Vector data = new Vector(); 
    data.add(results.getString(1)); 
    data.add(results.getString(2)); 
    vector.add(data); 


    } 
    //results.close(); 
    statement.close(); 
    dbConn.close(); 


} 
catch (InstantiationException e) { 
    System.err.println("Error in Instantiation!"); 
} 

catch (ClassNotFoundException e) { 
    System.err.println("Class not found!"); 
} 

catch (IllegalAccessException e) { 
    System.err.println("Access denied!"); 
} 


catch (SQLException e) { 
    System.err.println("SQL Error!"); 
} 


} 

} 

Answer 1

我以为你会送五点的值，你已经增加了五个标题。之后使用addRow(java.util.Vector)方法DefaultTableModel插入jTable1的行。

import java.awt.*; 
import java.awt.event.*; 
import javax.swing.*; 
import javax.swing.event.*; 
import javax.swing.table.*; 
import java.sql.*; 
import java.util.*; 



    public class Anzeige extends JFrame { 




    private JTable jTable1 = new JTable(5, 5); 
    private DefaultTableModel jTable1Model = (DefaultTableModel) jTable1.getModel(); 
    private JScrollPane jTable1ScrollPane = new JScrollPane(jTable1); 



public Anzeige (String title) { 
    super (title); 
    setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE); 
    int frameWidth = 676; 
    int frameHeight = 467; 
    setSize(frameWidth, frameHeight); 
    Dimension d = Toolkit.getDefaultToolkit().getScreenSize(); 
    int x = (d.width - getSize().width)/2; 
    int y = (d.height - getSize().height)/2; 
    setLocation(x, y); 
    Container cp = getContentPane(); 
    cp.setLayout(null); 


    // Anfang Komponenten 
    jTable1ScrollPane.setBounds(72, 56, 521, 289); 
    jTable1.getColumnModel().getColumn(0).setHeaderValue("Title 1"); 
    jTable1.getColumnModel().getColumn(1).setHeaderValue("Title 2"); 
    jTable1.getColumnModel().getColumn(2).setHeaderValue("Title 3"); 
    jTable1.getColumnModel().getColumn(3).setHeaderValue("Title 4"); 
    jTable1.getColumnModel().getColumn(4).setHeaderValue("Title 5"); 
    cp.add(jTable1ScrollPane); 
    // Ende Komponenten 
    setResizable(false); 
    setVisible(true); 



} 



public static void main(String[] args) { 
new Anzeige("Anzeige"); 



    try { 
    Class.forName("com.mysql.jdbc.Driver").newInstance(); 

    Connection dbConn = DriverManager.getConnection("jdbc:mysql://localhost:3306/nordwind", "root", ""); 

    Statement statement = dbConn.createStatement(); 

    ResultSet results = statement.executeQuery("SELECT * FROM Lieferranten"); 


    while (results.next()) { 
    String s1 = results.getString(2); 
    String s2 = results.getString(5); 
    System.out.println(s1 + "\n" + s2); 
    System.out.println(results.getString(2) + " " + results.getString(5)); 

    Vector data = new Vector(); 
    data.add(results.getString(1)); 
    data.add(results.getString(2)); 
    data.add(results.getString(3)); 
    data.add(results.getString(4)); 
    data.add(results.getString(5)); 
    jTable1Model.addRow(data); 


    } 
    //results.close(); 
    statement.close(); 
    dbConn.close(); 


} 
catch (InstantiationException e) { 
    System.err.println("Error in Instantiation!"); 
} 

catch (ClassNotFoundException e) { 
    System.err.println("Class not found!"); 
} 

catch (IllegalAccessException e) { 
    System.err.println("Access denied!"); 
} 


catch (SQLException e) { 
    System.err.println("SQL Error!"); 
} 


} 

}