getSelectedRow（）在將新數據加載到現有的JTable後返回-1

我正在編寫一個簡單的MySQL編輯器。我的問題是，我從數據庫中選擇一個新表並從數據庫中選擇並加載它，然後選擇一行並嘗試刪除它，getSelectedRow()返回-1並生成一個異常，但是當我刪除一行時不會發生這種情況從我的程序開始時加載的表格中刪除。getSelectedRow（）在將新數據加載到現有的JTable後返回-1

下面是從2個文件的關鍵部分代碼（在同一個代碼報價）：

package omnisql; 

import java.sql.*; 
import java.util.*; 

public class getData 
{ 
static Connect c = new Connect(); 

static GUI g = new GUI(); 

static ResultSet result; 

public static Vector<Vector<String>> data = new Vector<Vector<String>>(); 

public static String table="pracownicy"; 

public static Vector <String> d; 

public static List <String> id; 

    void getData() throws SQLException 
    {  
     result=c.stmt.executeQuery("select * from "+table); 

     id = new ArrayList<String>(); 

      while(result.next()) 
      { 
      d=new Vector<String>(); 

      id.add(result.getString("id")); 

      d.add(result.getString("id")); 
      d.add(result.getString("Nazwisko")); 
      d.add(result.getString("Imię")); 
      d.add(result.getString("Płeć")); 
      d.add(result.getString("Ulica")); 
      d.add(result.getString("Miejscowość")); 
      d.add(result.getString("Kod_pocztowy")); 
      d.add(result.getString("Województwo")); 
      d.add(result.getString("Telefon")); 

      data.add(d); 
      } 
    } 
    } 



package omnisql; 
    import java.awt.*; 
    import java.awt.event.ActionEvent; 
    import java.awt.event.ActionListener; 
    import java.awt.event.*; 
    import java.sql.PreparedStatement; 
    import java.sql.ResultSet; 
    import java.sql.SQLException; 
    import javax.swing.*; 
    import javax.swing.table.*; 
    import java.util.*; 
    import javax.swing.event.*; 


    public class GUI extends JFrame implements ActionListener, TableModelListener 
    { 
    static Connect c = new Connect(); 

    static getData gd = new getData(); 

JPanel panel = new JPanel(new FlowLayout(FlowLayout.LEFT,10,5)); 
JPanel panel1 = new JPanel(new FlowLayout(FlowLayout.LEFT,10,5)); 
JPanel panel2 = new JPanel(new FlowLayout(FlowLayout.CENTER,10,5)); 
JPanel panel3 = new JPanel(new FlowLayout(FlowLayout.LEFT,10,5)); 

JLabel typbazy = new JLabel("Typ bazy: "); 
JLabel wybtab = new JLabel("Wybierz tabelę: "); 

JRadioButton postgre = new JRadioButton("PostgreSQL"); 
JRadioButton mysql = new JRadioButton("MySQL"); 
JRadioButton sqlite = new JRadioButton("SQLite"); 

ButtonGroup grupa = new ButtonGroup(); 

public static JComboBox tabela = new JComboBox(); 

JButton addrec = new JButton("Dodaj rekord"); 
JButton delrec = new JButton("Usuń rekord"); 
JButton reftab = new JButton("Odśwież tabelę"); 

JTable table; 

public static DefaultTableModel model; 

TableColumn column; 

Vector<String> headers = new Vector<String>(); 

JScrollPane scroll; 

static int rownumber,addrow,delrow,updaterow;  

PreparedStatement pst; 

String value=""; 

public static int height,i,firstrow=0, klick=1; 

public GUI() 
{ 

    panel.add(typbazy); 

    grupa.add(postgre); 
    panel.add(postgre); 
    postgre.addActionListener(this); 

    grupa.add(mysql); 
    panel.add(mysql); 
    mysql.setSelected(rootPaneCheckingEnabled); 
    mysql.addActionListener(this); 

    grupa.add(sqlite); 
    panel.add(sqlite); 
    sqlite.addActionListener(this); 

    panel1.add(wybtab); 
    panel1.add(tabela); 

    tabela.setPreferredSize(new Dimension(120,20)); 
    tabela.setBackground(Color.white); 
    tabela.removeAllItems(); 
    tabela.addItem(" "); 
    tabela.addItem("Pracownicy"); 
    tabela.addItem("Pracownicy 2"); 
    tabela.setSelectedIndex(0); 
    tabela.addActionListener(this); 

    headers.add("ID"); 
    headers.add("Nazwisko"); 
    headers.add("Imię"); 
    headers.add("Płeć"); 
    headers.add("Ulica"); 
    headers.add("Miejscowość"); 
    headers.add("Kod_pocztowy"); 
    headers.add("Województwo"); 
    headers.add("Telefon"); 

    model = new DefaultTableModel(gd.data, headers); 
    table = new JTable(model); 
    table.setRowSelectionAllowed(true); 
    table.getModel().addTableModelListener(this); 
    table.setPreferredScrollableViewportSize(new Dimension(740,159)); 

    column = table.getColumnModel().getColumn(0); 
    column.setPreferredWidth(20); 

    column = table.getColumnModel().getColumn(1); 
    column.setPreferredWidth(100); 

    column = table.getColumnModel().getColumn(2); 
    column.setPreferredWidth(70); 

    column = table.getColumnModel().getColumn(3); 
    column.setPreferredWidth(70); 

    column = table.getColumnModel().getColumn(4); 
    column.setPreferredWidth(100); 

    column = table.getColumnModel().getColumn(5); 
    column.setPreferredWidth(100); 

    column = table.getColumnModel().getColumn(6); 
    column.setPreferredWidth(100); 

    column = table.getColumnModel().getColumn(7); 
    column.setPreferredWidth(100); 

    column = table.getColumnModel().getColumn(8); 
    column.setPreferredWidth(80); 

    scroll = new JScrollPane(table); 
    panel2.add(scroll); 

    panel3.add(addrec); 
    addrec.addActionListener(this); 
    panel3.add(delrec); 
    delrec.addActionListener(this); 
    panel3.add(reftab); 
    reftab.addActionListener(this); 

    getContentPane().setLayout(new BoxLayout(getContentPane(), BoxLayout.Y_AXIS)); 
    getContentPane().add(panel); 
    getContentPane().add(panel1); 
    getContentPane().add(panel2); 
    getContentPane().add(panel3); 

}  

void initGUI()   
{ 
    setSize(800,340);   
    setTitle("OmniSQL 1.0"); 
    setResizable(false); 
    setVisible(true); 
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
} 

public void tableChanged(TableModelEvent e) 
{ 
     rownumber = table.getSelectedRow(); 

     if (rownumber==-1) rownumber=0; 

     updaterow = Integer.parseInt(gd.id.get(rownumber)); 

     switch (e.getType()) 
     { 

     case TableModelEvent.UPDATE: 
     table.getRowCount(); 
     value=table.getValueAt(table.getSelectedRow(),table.getSelectedColumn()).toString(); 

     try 
     { 
     pst = c.con.prepareStatement("UPDATE "+gd.table+" SET "+table.getColumnName(table.getSelectedColumn())+" = '"+value+"' where id = "+updaterow+";"); 
     pst.executeUpdate(); 
     } 
     catch (SQLException err) 
     { 
     } 
     break; 
     } 
} 


public void actionPerformed(ActionEvent e) 
{ 

    /*if (e.getActionCommand().equals("MySQL")) 
    { 
     try 
     { 
     c.con.close();  
     c.connect("jdbc:mysql://localhost:3306/omnisql","root","sqlek","com.mysql.jdbc.Driver"); 
     } 
     catch (ClassNotFoundException er) 
     { 
     } 
     catch(SQLException err) 
     { 
     } 
    }*/ 

     if (tabela.getSelectedItem()=="Pracownicy") 
    { 
     gd.table="pracownicy"; 

     try 
     { 
     model.setRowCount(0); 
     table.removeAll(); 
     gd.getData(); 
     } 

     catch (SQLException er) 
     { 
     } 
    } 

    if (tabela.getSelectedItem()=="Pracownicy 2") 
    { 

     gd.table="pracownicy2"; 
     try 
     { 


     model.setRowCount(0); 

     gd.getData(); 
     table.revalidate(); 

     } 

     catch (SQLException er) 
     { 

     } 
    } 

     /*if(postgre.isSelected()) 
     { 
     tabela.removeAllItems(); 
     tabela.addItem("Adresy"); 
     tabela.addItem("Adresy 2"); 
     tabela.setSelectedIndex(0); 
     } 
     */ 
     /*if(mysql.isSelected()) 
     { 
     tabela.removeAllItems(); 
     tabela.addItem(" "); 
     tabela.addItem("Pracownicy"); 
     tabela.addItem("Pracownicy 2"); 
     }*/ 
    /* 
     if(sqlite.isSelected()) 
     { 
     tabela.removeAllItems(); 
     tabela.addItem("Zakłady"); 
     tabela.addItem("Zakłady 2"); 
     tabela.setSelectedIndex(0); 
     }*/ 


    if (e.getActionCommand().equals("Dodaj rekord")) 
    { 
     model.setRowCount(gd.id.size()); 
     rownumber = model.getRowCount()-1; 

     if(rownumber==-1 && gd.id.size()==0) 
     { 
     rownumber=0; 
     gd.id.add(0, "1"); 
     addrow=Integer.parseInt(gd.id.get(rownumber)); 
     } 
     else 
     { 
     addrow=Integer.parseInt(gd.id.get(rownumber)); 
     addrow++; 
     } 

     try 
     {  
     pst = c.con.prepareStatement("INSERT INTO "+gd.table+" (id) VALUES("+addrow+")"); 
     pst.executeUpdate(); 
     model.setRowCount(0); 
     gd.getData(); 
     height = (int)table.getPreferredSize().getHeight(); 
     table.scrollRectToVisible(new Rectangle(0,height,10,10)); 
     } 

     catch (SQLException exc) 
     { 

     }  
    } 

     rownumber=table.getSelectedRow(); 


    if (e.getActionCommand().equals("Usuń rekord")) 
    { 
     try 
     { 

     model.setRowCount(gd.id.size()); 

     System.out.println(rownumber); 

     delrow = Integer.parseInt(gd.id.get(rownumber)); 

     pst = c.con.prepareStatement("DELETE from "+gd.table+" where id="+delrow); 
     pst.executeUpdate(); 
     model.setRowCount(0); 
     gd.getData(); 
     } 

     catch (SQLException exc) 
     { 

     } 

    } 

    if (e.getActionCommand().equals("Odśwież tabelę")) 
    { 
    try 
    {  
    model.setRowCount(0); 
    gd.getData(); 
    } 
    catch (SQLException exc) 
     { 

     }  
    } 
} 
}

我將是這個問題的任何幫助，真的很感謝。

來源

2013-01-15 Archer

與您當前的問題無關，但它會解決代碼中的不同問題：請閱讀[如何比較Java中的字符串]（http://stackoverflow.com/questions/513832/how-do-i-compare -strings-in-java） – jlordo

這是一段巨大的代碼。一個演示相同問題的小例子會更有幫助。 – Dennis

發佈StackTrace – Amarnath

如果getSelectedRow()返回-1表示沒有選擇任何東西。

來源

2013-01-15 11:42:43 Archer

然後，在啓動時加載的默認表getSelectedRow（）返回適當的值，但是當我從數據庫加載新表時，它返回-1，就好像沒有選擇行一樣，但實際上它是被選中的。 – Archer

我認爲一旦你加載新的數據到'JTable'選項被重置。 – Archer

它應該重置，但它不是。 – Archer

getSelectedRow（）在將新數據加載到現有的JTable後返回-1

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