我正在制作一个注册系统，你可以通过JTextBox输入或删除任何学生信息。
到目前为止，我已允许我的程序添加数据。
我的问题是我正在尝试删除JTable中的行并反映我的SQL服务器中的更改。此外，我想允许我的程序编辑以前添加的任何数据。
我已经尝试了数小时的解决方案，但我仍然无法做到正确。
以下是源代码。
对于主要应用程序
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.sql.*;
import javax.swing.table.*;
import javax.swing.event.*;
public class MalayaUniversityEnrollment extends JFrame implements ActionListener, ItemListener
{
JLabel header = new JLabel ("MALAYA UNIVERSITY ENROLLMENT SYSTEM");
JCheckBox jcb = new JCheckBox ("Enable Editing");
JLabel searchHeader = new JLabel ("SEARCH A STUDENT ");
JLabel infoHeader = new JLabel ("STUDENT INFORMATION");
JButton addButton = new JButton ("ENROLL STUDENT");
JButton editButton = new JButton ("EDIT/UPDATE INFO");
JButton deleteButton = new JButton ("DELETE STUDENT");
JButton searchButton = new JButton ("SEARCH IT!");
JButton clearButton = new JButton ("CLEAR ALL FIELDS");
JTextField studentIDField = new JTextField();
JTextField lastNameField = new JTextField();
JTextField firstNameField = new JTextField();
JTextField middleInitialField = new JTextField();
JTextField CYSField = new JTextField();
JTextField tuitionField = new JTextField();
JTextField statusField = new JTextField();
JTextField searchField = new JTextField();
JLabel studentIDLabel = new JLabel ("Student ID Number: ");
JLabel lastNameLabel = new JLabel ("Last Name: ");
JLabel firstNameLabel = new JLabel ("First Name: ");
JLabel middleInitialLabel = new JLabel ("Middle Initial: ");
JLabel CYSLabel = new JLabel ("CYS: ");
JLabel tuitionLabel = new JLabel ("Semestral Tuition: ");
JLabel statusLabel = new JLabel ("Status: ");
private final JTable table = new JTable()
{
public boolean isCellEditable(int rowIndex, int colIndex)
{
return false;
}
};
private final JScrollPane scrollPane = new JScrollPane();
String SID ="";
String lastName="";
String firstName="";
String middleInitial="";
String CYS="";
Double semestralTuition=0.00;
String studentStatus="";
String sid,lname,fname,midinit,cysection,stats;
Double semtui;
String sidPlacer,lnamePlacer,fnamePlacer,midinitPlacer,cysPlacer,statusPlacer;
Double tuitionPlacer;
String[] headers = {"Student ID", "Last Name", "First Name", "Middle Initial","CYS", "Semestral Tuition", "Status"};
DefaultTableModel model = new DefaultTableModel();
public MalayaUniversityEnrollment()
{
super ("Malaya University [Enrollment]");
Container c = getContentPane();
c.setLayout(null);
c.add(header);
header.setBounds(290,20,1000,35);
header.setFont(new Font("Tahoma", Font.PLAIN, 35));
c.add(addButton);
c.add(editButton);
c.add(deleteButton);
c.add(searchButton);
c.add(clearButton);
c.add(searchHeader);
c.add(infoHeader);
c.add(studentIDField);
c.add(lastNameField);
c.add(firstNameField);
c.add(middleInitialField);
c.add(CYSField);
c.add(tuitionField);
c.add(statusField);
c.add(searchField);
c.add(studentIDLabel);
c.add(lastNameLabel);
c.add(firstNameLabel);
c.add(middleInitialLabel);
c.add(CYSLabel);
c.add(tuitionLabel);
c.add(statusLabel);
c.add(jcb);
jcb.setBounds(565,766,146,23);
studentIDLabel.setBounds(50,575,100,30);
lastNameLabel.setBounds(50,615,100,30);
firstNameLabel.setBounds(50,660,100,30);
middleInitialLabel.setBounds(50,700,100,30);
studentIDField.setBounds(175,575,200,30);
lastNameField.setBounds(175,615,200,30);
firstNameField.setBounds(175,660,200,30);
middleInitialField.setBounds(175,700,200,30);
CYSLabel.setBounds(450,575,100,30);
tuitionLabel.setBounds(450,615,100,30);
statusLabel.setBounds(450,660,100,30);
CYSField.setBounds(575,575,200,30);
tuitionField.setBounds(575,615,200,30);
statusField.setBounds(575,660,200,30);
infoHeader.setBounds(270,525,500,50);
infoHeader.setFont(new Font("Tahoma", Font.PLAIN, 30));
searchField.setBounds(885,638,300,30);
searchHeader.setBounds(895,575,300,50);
searchHeader.setFont(new Font("Tahoma", Font.PLAIN, 30));
searchButton.setBounds(938,688,200,23);
addButton.setBounds(450,700,146,23);
editButton.setBounds(630,700,146,23);
deleteButton.setBounds(450,733,146,23);
clearButton.setBounds(630,733,146,23);
studentIDField.setHorizontalAlignment(JTextField.CENTER);
lastNameField.setHorizontalAlignment(JTextField.CENTER);
firstNameField.setHorizontalAlignment(JTextField.CENTER);
middleInitialField.setHorizontalAlignment(JTextField.CENTER);
CYSField.setHorizontalAlignment(JTextField.CENTER);
tuitionField.setHorizontalAlignment(JTextField.CENTER);
statusField.setHorizontalAlignment(JTextField.CENTER);
searchField.setHorizontalAlignment(JTextField.CENTER);
scrollPane.setBounds(50, 88, 1190, 412);
getContentPane().add(scrollPane);
table.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
table.setShowGrid(true);
model.setColumnIdentifiers(headers);
table.setModel(model);
scrollPane.setViewportView(table);
JTableHeader header = table.getTableHeader();
header.setDefaultRenderer(new HeaderRenderer(table));
table.getTableHeader().setReorderingAllowed(false);
setSize(1300,850);
setVisible(true);
setDefaultCloseOperation(EXIT_ON_CLOSE);
setLocationRelativeTo(null);
for (int y=0; y<7; y++)
{
DefaultTableCellRenderer centerRenderer = new DefaultTableCellRenderer();
centerRenderer.setHorizontalAlignment( JLabel.CENTER );
table.getColumnModel().getColumn(y).setCellRenderer( centerRenderer );
}
RetrieveData();
table.getSelectionModel().addListSelectionListener(new ListSelectionListener()
{
public void valueChanged(ListSelectionEvent e)
{
int selectedRow = table.getSelectedRow();
sid = (String)table.getValueAt(selectedRow, 0);
lname = (String)table.getValueAt(selectedRow, 1);
fname = (String)table.getValueAt(selectedRow, 2);
midinit = (String)table.getValueAt(selectedRow, 3);
cysection = (String)table.getValueAt(selectedRow, 4);
semtui = (Double)table.getValueAt(selectedRow, 5);
stats = (String)table.getValueAt(selectedRow, 6);
studentIDField.setText(sid);
lastNameField.setText(lname);
firstNameField.setText(fname);
middleInitialField.setText(midinit);
CYSField.setText(cysection);
tuitionField.setText(Double.toString(semtui));
statusField.setText(stats);
}
});
addButton.addActionListener(this);
editButton.addActionListener(this);
searchButton.addActionListener(this);
deleteButton.addActionListener(this);
clearButton.addActionListener(this);
jcb.addItemListener(this);
studentIDField.setEditable(false);
lastNameField.setEditable(false);
firstNameField.setEditable(false);
middleInitialField.setEditable(false);
CYSField.setEditable(false);
tuitionField.setEditable(false);
statusField.setEditable(false);
}
public void actionPerformed (ActionEvent aev)
{
if (aev.getSource() == clearButton)
{
studentIDField.setText("");
lastNameField.setText("");
firstNameField.setText("");
middleInitialField.setText("");
CYSField.setText("");
tuitionField.setText("");
statusField.setText("");
}
if (aev.getSource() == deleteButton)
{
DataDeletion();
}
if (aev.getSource() == addButton)
{
String sidPlacer = studentIDField.getText();
String lnamePlacer = lastNameField.getText();
String fnamePlacer = firstNameField.getText();
String midinitPlacer = middleInitialField.getText();
String cysPlacer = CYSField.getText();
Double tuitionPlacer = Double.parseDouble(tuitionField.getText());
String statusPlacer = statusField.getText();
try
{
String queryAdd = "INSERT INTO `malaya university`.`2013-2014 enrollment` (`Student_ID`, `Last_Name`, `First_Name`, `Middle_Initial`, `CYS`, `Semestral_Tuition`, `Status`) VALUES (?,?,?,?,?,?,?)";
DatabaseConfig a = new DatabaseConfig();
a.ExecuteAddQuery(queryAdd , sidPlacer ,lnamePlacer, fnamePlacer, midinitPlacer, cysPlacer, tuitionPlacer, statusPlacer);
}
catch (Exception eee)
{
JOptionPane.showMessageDialog(null, "Record added Successfully.", "Registration Complete", JOptionPane.INFORMATION_MESSAGE);
System.out.println(eee.getMessage());
}
model.addRow(new Object[]{sidPlacer,lnamePlacer,fnamePlacer,midinitPlacer,cysPlacer,tuitionPlacer,statusPlacer});
studentIDField.setEditable(false);
lastNameField.setEditable(false);
firstNameField.setEditable(false);
middleInitialField.setEditable(false);
CYSField.setEditable(false);
tuitionField.setEditable(false);
statusField.setEditable(false);
jcb.setSelected(false);
}
if (aev.getSource() == editButton)
{
String sidPlacer = studentIDField.getText();
String lnamePlacer = lastNameField.getText();
String fnamePlacer = firstNameField.getText();
String midinitPlacer = middleInitialField.getText();
String cysPlacer = CYSField.getText();
Double tuitionPlacer = Double.parseDouble(tuitionField.getText());
String statusPlacer = statusField.getText();
try
{
String queryEdit = "UPDATE `malaya university`.`2013-2014 enrollment` SET `Student_ID` = ? AND `2013-2014 enrollment`.`Last_Name` = ? AND `2013-2014 enrollment`.`First_Name` = ? AND `2013-2014 enrollment`.`Middle_Initial` = ? AND `2013-2014 enrollment`.`CYS` = ? AND CONCAT(`Semestral_Tuition` = ? AND `2013-2014 enrollment`.`Status` = ?) WHERE `2013-2014 enrollment`.`Student_ID` = '"+ sid + "' AND `2013-2014 enrollment`.`Last_Name` = '" + lname + "' AND `2013-2014 enrollment`.`First_Name` = '" + fname + "' AND `2013-2014 enrollment`.`Middle_Initial` = '" + midinit + "' AND `2013-2014 enrollment`.`CYS` = '"
+ cysection + "' AND CONCAT( `2013-2014 enrollment`.`Semestral_Tuition` ) = '" + Double.toString(semtui) + "' AND `2013-2014 enrollment`.`Status` = '" + stats + "'";
DatabaseConfig a = new DatabaseConfig();
a.ExecuteEditQuery(queryEdit , sidPlacer ,lnamePlacer, fnamePlacer, midinitPlacer, cysPlacer, tuitionPlacer, statusPlacer,sid,lname,fname,midinit,cysection,semtui,stats);
}
catch (Exception eee)
{
JOptionPane.showMessageDialog(null, "Record updated Successfully.", "Update Complete", JOptionPane.INFORMATION_MESSAGE);
System.out.println(eee.getMessage());
}
studentIDField.setEditable(false);
lastNameField.setEditable(false);
firstNameField.setEditable(false);
middleInitialField.setEditable(false);
CYSField.setEditable(false);
tuitionField.setEditable(false);
statusField.setEditable(false);
jcb.setSelected(false);
}
}
public void itemStateChanged(ItemEvent iev)
{
if (iev.getSource() == jcb)
{
if(iev.getStateChange() == ItemEvent.SELECTED)
{
studentIDField.setEditable(true);
lastNameField.setEditable(true);
firstNameField.setEditable(true);
middleInitialField.setEditable(true);
CYSField.setEditable(true);
tuitionField.setEditable(true);
statusField.setEditable(true);
}
else
{
studentIDField.setEditable(false);
lastNameField.setEditable(false);
firstNameField.setEditable(false);
middleInitialField.setEditable(false);
CYSField.setEditable(false);
tuitionField.setEditable(false);
statusField.setEditable(false);
}
}
}
private static class HeaderRenderer implements TableCellRenderer
{
DefaultTableCellRenderer renderer;
public HeaderRenderer(JTable table)
{
renderer = (DefaultTableCellRenderer)
table.getTableHeader().getDefaultRenderer();
renderer.setHorizontalAlignment(JLabel.CENTER);
}
public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected,boolean hasFocus, int row, int col)
{
return renderer.getTableCellRendererComponent(
table, value, isSelected, hasFocus, row, col);
}
}
public void RetrieveData()
{
try
{
int x=0;
String querySelect = "Select * FROM `2013-2014 enrollment`";
DatabaseConfig a = new DatabaseConfig();
ResultSet rs = a.showR(querySelect);
while(rs.next())
{
SID = rs.getString("Student_ID");
lastName = rs.getString("Last_Name");
firstName = rs.getString("First_Name");
middleInitial = rs.getString("Middle_Initial");
CYS = rs.getString("CYS");
semestralTuition = rs.getDouble("Semestral_Tuition");
studentStatus = rs.getString("Status");
model.addRow(new Object[]{SID,lastName,firstName,middleInitial,CYS,semestralTuition,studentStatus});
x++;
}
}
catch (Exception e)
{
JOptionPane.showMessageDialog(null, "There is Sum Thing Wong.", "ERROR", JOptionPane.ERROR_MESSAGE);
}
}
public void DataDeletion()
{
int r = model.getRowCount();
for(int i=(r-1);i>=0;i--)
{
model.removeRow(i);
}
}
public static void main (String[] args)
{
try
{
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
}
catch (Exception exe)
{
System.out.println("ERROR: Could not Load System UI.");
}
new MalayaUniversityEnrollment();
}
}
这是保存SQL连接的类文件。
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
public class DatabaseConfig {
private String database = "jdbc:mysql://localhost:3306/malaya university";
private String user = "*";
private String password = "*";
Connection con;
Statement stmt = null;
public ResultSet showR(String q) throws Exception{
try
{
Class.forName("com.mysql.jdbc.Driver");
this.con = DriverManager.getConnection(this.database, this.user, this.password);
PreparedStatement stmt = con.prepareStatement(q);
ResultSet rs = stmt.executeQuery();
return rs;
} catch (SQLException e) {
System.out.println(e.getMessage());
return null;
} finally {
if (stmt != null) { stmt.close();}
}
}
// execute for insert update delete
public void ExecuteAddQuery(String q,String sidPlacer, String lnamePlacer, String fnamePlacer, String midinitPlacer, String cysPlacer, Double tuitionPlacer, String statusPlacer)throws Exception{
try{
Class.forName("com.mysql.jdbc.Driver");
this.con = DriverManager.getConnection(this.database, this.user, this.password);
PreparedStatement pstmt1 = con.prepareStatement("INSERT INTO `malaya university`.`2013-2014 enrollment` VALUES (?,?,?,?,?,?,?)");
//stmt = con.createStatement();
pstmt1.setString(1,sidPlacer);
pstmt1.setString(2,lnamePlacer);
pstmt1.setString(3,fnamePlacer);
pstmt1.setString(4,midinitPlacer);
pstmt1.setString(5,cysPlacer);
pstmt1.setDouble(6,tuitionPlacer);
pstmt1.setString(7,statusPlacer);
pstmt1.executeUpdate();
stmt.executeUpdate(q);
} catch (SQLException e) {
System.out.println(e.getMessage());
} finally {
if (stmt != null) { stmt.close();}
}
}
public void ExecuteEditQuery(String q,String sidPlacer, String lnamePlacer, String fnamePlacer, String midinitPlacer, String cysPlacer, Double tuitionPlacer, String statusPlacer,String sid,String lname,String fname,String midinit,String cysection,Double semtui,String stats)throws Exception
{
try{
Class.forName("com.mysql.jdbc.Driver");
this.con = DriverManager.getConnection(this.database, this.user, this.password);
PreparedStatement pstmt2 = con.prepareStatement("UPDATE `malaya university`.`2013-2014 enrollment` SET `Student_ID` = ? AND `2013-2014 enrollment`.`Last_Name` = ? AND `2013-2014 enrollment`.`First_Name` = ? AND `2013-2014 enrollment`.`Middle_Initial` = ? AND `2013-2014 enrollment`.`CYS` = ? AND CONCAT(`Semestral_Tuition` = ? AND `2013-2014 enrollment`.`Status` = ?) WHERE `2013-2014 enrollment`.`Student_ID` = '"+ sid + "' AND `2013-2014 enrollment`.`Last_Name` = '" + lname + "' AND `2013-2014 enrollment`.`First_Name` = '" + fname + "' AND `2013-2014 enrollment`.`Middle_Initial` = '" + midinit + "' AND `2013-2014 enrollment`.`CYS` = '"
+ cysection + "' AND CONCAT( `2013-2014 enrollment`.`Semestral_Tuition` ) = '" + Double.toString(semtui) + "' AND `2013-2014 enrollment`.`Status` = '" + stats + "'");
pstmt2.setString(1,sidPlacer);
pstmt2.setString(2,lnamePlacer);
pstmt2.setString(3,fnamePlacer);
pstmt2.setString(4,midinitPlacer);
pstmt2.setString(5,cysPlacer);
pstmt2.setDouble(6,tuitionPlacer);
pstmt2.setString(7,statusPlacer);
pstmt2.executeUpdate();
stmt.executeUpdate(q);
} catch (SQLException e) {
System.out.println(e.getMessage());
} finally {
if (stmt != null) { stmt.close();}
}
}
public void closeConnection() throws Exception
{
this.con.close();
}
}
任何帮助将不胜感激。提前致谢。
编辑：点击删除学生按钮会出现此错误：
Exception in thread "AWT-EventQueue-0" java.lang.ArrayIndexOutOfBoundsException: -1
at java.util.Vector.elementData(Vector.java:730)
at java.util.Vector.elementAt(Vector.java:473)
at javax.swing.table.DefaultTableModel.getValueAt(DefaultTableModel.java:649)
at javax.swing.JTable.getValueAt(JTable.java:2720)
at MalayaUniversityEnrollment$2.valueChanged(MalayaUniversityEnrollment.java:197)
at javax.swing.DefaultListSelectionModel.fireValueChanged(DefaultListSelectionModel.java:184)
at javax.swing.DefaultListSelectionModel.fireValueChanged(DefaultListSelectionModel.java:164)
at javax.swing.DefaultListSelectionModel.fireValueChanged(DefaultListSelectionModel.java:211)
at javax.swing.DefaultListSelectionModel.removeIndexInterval(DefaultListSelectionModel.java:677)
at javax.swing.JTable.tableRowsDeleted(JTable.java:4512)
at javax.swing.JTable.tableChanged(JTable.java:4415)
at javax.swing.table.AbstractTableModel.fireTableChanged(AbstractTableModel.java:296)
at javax.swing.table.AbstractTableModel.fireTableRowsDeleted(AbstractTableModel.java:261)
at javax.swing.table.DefaultTableModel.removeRow(DefaultTableModel.java:464)
at MalayaUniversityEnrollment.DataDeletion(MalayaUniversityEnrollment.java:419)
at MalayaUniversityEnrollment.actionPerformed(MalayaUniversityEnrollment.java:249)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2018)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2341)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252)
at java.awt.Component.processMouseEvent(Component.java:6505)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3321)
at java.awt.Component.processEvent(Component.java:6270)
at java.awt.Container.processEvent(Container.java:2229)
at java.awt.Component.dispatchEventImpl(Component.java:4861)
at java.awt.Container.dispatchEventImpl(Container.java:2287)
at java.awt.Component.dispatchEvent(Component.java:4687)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4832)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4492)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4422)
at java.awt.Container.dispatchEventImpl(Container.java:2273)
at java.awt.Window.dispatchEventImpl(Window.java:2719)
at java.awt.Component.dispatchEvent(Component.java:4687)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:723)
at java.awt.EventQueue.access$200(EventQueue.java:103)
at java.awt.EventQueue$3.run(EventQueue.java:682)
at java.awt.EventQueue$3.run(EventQueue.java:680)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:87)
at java.awt.EventQueue$4.run(EventQueue.java:696)
at java.awt.EventQueue$4.run(EventQueue.java:694)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:693)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:244)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:163)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:151)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:147)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:139)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:97)
答案 0 :(得分：0)
扩展DefaultTableModel并覆盖getValueAt()。
class MyTableModel extends DefaultTableModel {
public Object getValueAt(int r, int c) {
if (r < 0 || c < 0) return "";
return super.getValueAt(r, c);
}
}
答案 1 :(得分：0)
以前在数据库使用中添加的数据：
select from table where rowid = last_insert_rowid()