Select 来自 jlist 并使用复选框更新 jtable
Select from jlist and update jtable using checkbox
我制作了一个 java 程序，里面有 2 个 jlist（主类别和子类别）和一个从 mysql 数据库检索值的 jtable，在 jtable 中有一个额外的复选框列，当用户 selects 几行和 selects 来自 jlists 的值时，它会自动更新 jtable 中的 2 列（主类别和子类别），我面临的问题是第一次你 select 几行你更新它工作正常但是然后当你 select 几个不同的行和更新比它更新你之前 selected 的行和您刚刚 select 编辑的行，那么我该如何解决这个问题？请帮忙
我的代码：
//Import Statements
import java.awt.EventQueue;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JList;
import javax.swing.JOptionPane;
import javax.swing.JTable;
import javax.swing.JScrollPane;
import javax.swing.ListSelectionModel;
import javax.swing.table.DefaultTableModel;
import javax.swing.JLabel;
import javax.swing.JButton;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.awt.Font;
import java.awt.Color;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.sql.PreparedStatement;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.security.auth.Refreshable;
import javax.swing.JCheckBox;
import javax.swing.JComboBox;
import javax.swing.JTextField;
import net.proteanit.sql.DbUtils;
public class stock extends JFrame implements MouseListener {
Object selectedCellValue[] = new Object[50];//Variable for selecting cell in JTable
static Connection connection = null;//Connects to sql
static Statement stmt = null;//Makes sql query or statement
static ResultSet rs = null;//gets results from the query
JLabel lblDate;
JLabel lblUpdateStock;
JLabel lblcategory;
JLabel lblSubcategory;
JTextField txtPartNo;
int selectedRow[] = new int[5000];//variable which stores selected row in a table
static int index = 0;
static JTable table;
JList main_list;//Main category
JList sub_list;//Sub category
JScrollPane scrollPane_1;
private static String[] categories = {"Accessories", "Boxed Accessories", "Cordless", "Demolition", "Drilling", "Dust Extraction Accessories", "Garden / Agriculture Tools", "Grinding", "Grinding / Cutting", "Nibblers", "Petrol Engine Tools", "Planing", "Rotary / Demolition", "Rotary Drilling", "Routing", "Routing / Planing", "Sanding / Polishing", "Sawing", "Screwdriving", "Shears"};
private static String[] sub_categories = {"Abrasive Belt", "Abrasive Disc / Pad", "Abrasive Paper", "Abrasive Wheels", "Accessories", "Accessories for Core Cutters", "Adapter / Drill Chuck / Dust bag", "Adapters / Battery Holder / Bulb", "Band Saw Blades and Accessories", "Battery / Charger Reference Chart", "Battery Chargers", "Belt Sander Accessories", "Broach Cutter for Magnetic Drilling Machine", "Brush and Dust bag", "Brush Cutter Accessories", "Chain Mortiser Accessories", "Chisels", "Combination Sets", "Core Bits", "Core Cutters", "Cut-out Tool Accessories", "Cutting metal", "Diamond Polishing Pad", "Drill Bits", "Drill Bits / Chisels", "Drill Bits / Holesaws", "Drill Chuck", "Drill Chucks / Angle Attachment", "Drill Stand", "Driver Drills / Bit Sets", "Dust Bag", "Dust Cover / Bag", "Extension Bar / Universal Joint / Adapters / Assembly", "Filters", "Flanges", "Glass and Tiles", "Grip", "Grip / Trolley", "Grip/ Loop Handle / Wrenches", "Guide Rule / Guide Rail", "Hammer Service Kits / Oil supply", "Hedge Trimmer Blades", "Hole saw", "Hook and Oil", "Hoses & Pipes", "Impact Sockets", "Jig Saw Accessories", "Jig Saw Blades", "Lawn Mower Blades", "Lithium-ion Batteries", "Maccess Accessories Set", "Masonry", "Masonry, Concrete", "Metal", "Mixing Blades", "Ni-Cd Batteries", "Nibbling Accessories", "Nozzles", "Oil / Grip", "Other Accessories", "Other Blades", "Other Blades & Rings", "Pad", "Petrol Blower Accessories", "Philips Bits", "Philips Bits Holder / Socket Bits", "Planner Accessories", "Plate Joiner Accessories", "Reciprocating Saw Blades", "Router Bits", "Router Bits / Impact Sockets", "Scroll Saw Blades", "Shearing Accessories", "Slide Compound / Miter Saw Accessories", "Slotted Bits", "Specialized Blades", "System Charts", "Table and Stand", "Table Saw Accessories", "Thin Cutting Wheels", "Trimmer, Router, Sash Router Accessories", "Wood", "Wood Cutting"};
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
stock frame = new stock();
frame.setVisible(true);
}
});
}
/**
* Create the frame.
*/
public stock() {
getContentPane().setBackground(new Color(176, 224, 230));
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100, 100, 664, 698);
setResizable(false);
setLocationRelativeTo(null);
getContentPane().setLayout(null);
// Customer List
ImageIcon titleIcon = new ImageIcon("C:\Users\Samir\Desktop\banner.jpg");
lblUpdateStock = new JLabel(titleIcon);
lblUpdateStock.setFont(new Font("Castellar", Font.BOLD, 28));
lblUpdateStock.setBounds(0, 0, 658, 111);
getContentPane().add(lblUpdateStock);
JLabel lblPartNo = new JLabel("Part No :");
lblPartNo.setFont(new Font("Bookman Old Style", Font.PLAIN, 16));
lblPartNo.setBounds(20, 132, 70, 14);
getContentPane().add(lblPartNo);
txtPartNo = new JTextField();
txtPartNo.setBounds(100, 127, 172, 24);
getContentPane().add(txtPartNo);
txtPartNo.setColumns(10);
lblcategory = new JLabel("Main Category");
lblcategory.setFont(new Font("Calisto MT", Font.PLAIN, 16));
lblcategory.setBounds(103, 173, 127, 24);
getContentPane().add(lblcategory);
lblSubcategory = new JLabel("Sub Category");
lblSubcategory.setFont(new Font("Bookman Old Style", Font.PLAIN, 16));
lblSubcategory.setBounds(432, 173, 107, 24);
getContentPane().add(lblSubcategory);
// ScrollPane
JScrollPane scrollPane2 = new JScrollPane();
scrollPane2.setBounds(20, 480, 617, 154);
getContentPane().add(scrollPane2);
// Table
table = new JTable();
scrollPane2.setViewportView(table);
// Button Update
JButton btnUpdate = new JButton("update");
btnUpdate.setBounds(274, 439, 107, 30);
btnUpdate.setFont(new Font("Copperplate Gothic Bold", Font.PLAIN, 18));
btnUpdate.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
try {
UpdateData();
PopulateData();
} catch (SQLException ex) {
Logger.getLogger(stock.class.getName()).log(Level.SEVERE, null, ex);
}
}
});
getContentPane().add(btnUpdate);
JScrollPane scrollPane = new JScrollPane();
scrollPane.setBounds(20, 202, 287, 226);
getContentPane().add(scrollPane);
main_list = new JList(categories);
scrollPane.setViewportView(main_list);
main_list.setFont(new Font("Simplified Arabic Fixed", Font.PLAIN, 15));
main_list.setVisibleRowCount(3);
main_list.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
scrollPane_1 = new JScrollPane();
scrollPane_1.setBounds(336, 202, 301, 226);
getContentPane().add(scrollPane_1);
sub_list = new JList(sub_categories);
scrollPane_1.setViewportView(sub_list);
sub_list.setFont(new Font("Simplified Arabic Fixed", Font.PLAIN, 15));
sub_list.setVisibleRowCount(3);
sub_list.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
PopulateData();
table.addMouseListener(new MouseAdapter() {
public void mouseClicked(MouseEvent e) {
if (e.getClickCount() == 1) {
JTable target = (JTable) e.getSource();
selectedRow[index] = target.getSelectedRow();
int selectedColumn = 0;
selectedCellValue[index] = target.getValueAt(selectedRow[index], selectedColumn);
index++;
}
}
});
}
private static void PopulateData() {
// Clear table
table.setModel(new DefaultTableModel());
// Model for Table
DefaultTableModel model = new DefaultTableModel() {
public Class<?> getColumnClass(int column) {
switch (column) {
case 0:
return String.class;
case 1:
return String.class;
case 2:
return String.class;
case 3:
return String.class;
case 4:
return Boolean.class;
default:
return String.class;
}
}
};
table.setModel(model);
// Add Column
// model.addColumn("Select");
model.addColumn("product_code");
model.addColumn("description");
model.addColumn("main_category");
model.addColumn("sub_category");
model.addColumn("Select");
Connection con = null;
Statement s = null;
try {
//Change this
// Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
// con = DriverManager.getConnection("jdbc:odbc:Project");
try{
Class.forName("com.mysql.jdbc.Driver").newInstance();
} catch (InstantiationException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
con = DriverManager.getConnection("jdbc:mysql://192.168.1.254/asser_old?user=&password=");
s = con.createStatement();
String sql = "SELECT product_code, description, main_category,sub_category FROM stock";
ResultSet rec = s.executeQuery(sql);
int row = 0;
while ((rec != null) && (rec.next())) {
model.addRow(new Object[0]);
model.setValueAt(false, row, 4); // Checkbox
model.setValueAt(rec.getString("product_code"), row, 0);
model.setValueAt(rec.getString("description"), row, 1);
model.setValueAt(rec.getString("main_category"), row, 2);
model.setValueAt(rec.getString("sub_category"), row, 3);
row++;
}
} catch (Exception e) {
// TODO Auto-generated catch block
JOptionPane.showMessageDialog(null, e.getMessage());
e.printStackTrace();
}
}
private void UpdateData() throws SQLException {
Connection connect = null;
Statement s = null;
ResultSet rs = null;
try{
Class.forName("com.mysql.jdbc.Driver").newInstance();
} catch (InstantiationException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
connect = DriverManager.getConnection("jdbc:mysql://192.168.1.254/asser_old?user=&password=");
System.out.println("Connected");
s = connect.createStatement();
String part = "";
String partno = txtPartNo.getText().toString();
String Descrip = "";
String cat = "";
String subcat = "";
String category = main_list.getSelectedValue().toString();
String sub_category = sub_list.getSelectedValue().toString();
String query = "Select description,main_category,sub_category from stock where product_code ='" + partno + "'";
stmt = connect.createStatement();
rs = stmt.executeQuery(query);
while (rs.next()) {
Descrip = rs.getString("description");
cat = rs.getString("main_category");
subcat = rs.getString("sub_category");
}
String query2 = "UPDATE stock SET main_category='" + category + "',sub_category='" + sub_category + "' where product_code ='" + partno + "'";
stmt.executeUpdate(query2);
System.out.println("Updated");
txtPartNo.setText("");
txtPartNo.requestFocus();
System.out.println(selectedCellValue[index]);
for (int count = 0; count < index; count++) {
String sql = "select * from stock where product_code = '" + selectedCellValue[count] + "' ";
rs = s.executeQuery(sql);
String sql2 = "UPDATE stock SET main_category='" + category + "',sub_category='" + sub_category + "' where product_code = '" + selectedCellValue[count] + "'";
s.executeUpdate(sql2);
}
}
@Override
public void mousePressed(MouseEvent e) {
}
@Override
public void mouseReleased(MouseEvent e) {
}
@Override
public void mouseEntered(MouseEvent e) {
}
@Override
public void mouseExited(MouseEvent e) {
}
@Override
public void mouseClicked(MouseEvent arg0) {
}
}
一个基本的想法是将 table/model 中的数据重置回 false，例如..
for (int row = 0; row < table.getRowCount(); row++) {
if (table.getValueAt(row, 4) == Boolean.TRUE) {
table.setValueAt(Boolean.FALSE, row, 4);
}
}
仔细查看 How to Use Tables 了解更多详情
已更新
去掉selectedCellValue，简直就是乱七八糟的事情
只需使用类似上述的内容来构建 List 个所选项目
List<Integer> selectedRows = new ArrayList<>(25);
for (int row = 0; row < table.getRowCount(); row++) {
if (table.getValueAt(row, 4) == Boolean.TRUE) {
selectedRows.add(row);
}
}
然后像...
for (int row : selectedRows) {
int code = table.getValueAt(row, 0);
String sql = "select * from stock where product_code = '" + code + "' ";
// Blah, blah, blah...
获取所选行所需的值。当然，您可以将这两种想法结合起来，使用一个循环代替...
您让您的数据库资源处于危险的无人管理状态，这可能会降低您的应用程序的性能，并导致数据库服务器在这些资源的使用寿命之外保持打开的连接。
查看 The try-with-resources Statement 一些关于如何更好地管理资源的想法。请记住，如果打开它，则必须关闭它。
您也迫切需要了解 Using Prepared Statements
我制作了一个 java 程序，里面有 2 个 jlist（主类别和子类别）和一个从 mysql 数据库检索值的 jtable，在 jtable 中有一个额外的复选框列，当用户 selects 几行和 selects 来自 jlists 的值时，它会自动更新 jtable 中的 2 列（主类别和子类别），我面临的问题是第一次你 select 几行你更新它工作正常但是然后当你 select 几个不同的行和更新比它更新你之前 selected 的行和您刚刚 select 编辑的行，那么我该如何解决这个问题？请帮忙
我的代码：
//Import Statements
import java.awt.EventQueue;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JList;
import javax.swing.JOptionPane;
import javax.swing.JTable;
import javax.swing.JScrollPane;
import javax.swing.ListSelectionModel;
import javax.swing.table.DefaultTableModel;
import javax.swing.JLabel;
import javax.swing.JButton;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.awt.Font;
import java.awt.Color;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.sql.PreparedStatement;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.security.auth.Refreshable;
import javax.swing.JCheckBox;
import javax.swing.JComboBox;
import javax.swing.JTextField;
import net.proteanit.sql.DbUtils;
public class stock extends JFrame implements MouseListener {
Object selectedCellValue[] = new Object[50];//Variable for selecting cell in JTable
static Connection connection = null;//Connects to sql
static Statement stmt = null;//Makes sql query or statement
static ResultSet rs = null;//gets results from the query
JLabel lblDate;
JLabel lblUpdateStock;
JLabel lblcategory;
JLabel lblSubcategory;
JTextField txtPartNo;
int selectedRow[] = new int[5000];//variable which stores selected row in a table
static int index = 0;
static JTable table;
JList main_list;//Main category
JList sub_list;//Sub category
JScrollPane scrollPane_1;
private static String[] categories = {"Accessories", "Boxed Accessories", "Cordless", "Demolition", "Drilling", "Dust Extraction Accessories", "Garden / Agriculture Tools", "Grinding", "Grinding / Cutting", "Nibblers", "Petrol Engine Tools", "Planing", "Rotary / Demolition", "Rotary Drilling", "Routing", "Routing / Planing", "Sanding / Polishing", "Sawing", "Screwdriving", "Shears"};
private static String[] sub_categories = {"Abrasive Belt", "Abrasive Disc / Pad", "Abrasive Paper", "Abrasive Wheels", "Accessories", "Accessories for Core Cutters", "Adapter / Drill Chuck / Dust bag", "Adapters / Battery Holder / Bulb", "Band Saw Blades and Accessories", "Battery / Charger Reference Chart", "Battery Chargers", "Belt Sander Accessories", "Broach Cutter for Magnetic Drilling Machine", "Brush and Dust bag", "Brush Cutter Accessories", "Chain Mortiser Accessories", "Chisels", "Combination Sets", "Core Bits", "Core Cutters", "Cut-out Tool Accessories", "Cutting metal", "Diamond Polishing Pad", "Drill Bits", "Drill Bits / Chisels", "Drill Bits / Holesaws", "Drill Chuck", "Drill Chucks / Angle Attachment", "Drill Stand", "Driver Drills / Bit Sets", "Dust Bag", "Dust Cover / Bag", "Extension Bar / Universal Joint / Adapters / Assembly", "Filters", "Flanges", "Glass and Tiles", "Grip", "Grip / Trolley", "Grip/ Loop Handle / Wrenches", "Guide Rule / Guide Rail", "Hammer Service Kits / Oil supply", "Hedge Trimmer Blades", "Hole saw", "Hook and Oil", "Hoses & Pipes", "Impact Sockets", "Jig Saw Accessories", "Jig Saw Blades", "Lawn Mower Blades", "Lithium-ion Batteries", "Maccess Accessories Set", "Masonry", "Masonry, Concrete", "Metal", "Mixing Blades", "Ni-Cd Batteries", "Nibbling Accessories", "Nozzles", "Oil / Grip", "Other Accessories", "Other Blades", "Other Blades & Rings", "Pad", "Petrol Blower Accessories", "Philips Bits", "Philips Bits Holder / Socket Bits", "Planner Accessories", "Plate Joiner Accessories", "Reciprocating Saw Blades", "Router Bits", "Router Bits / Impact Sockets", "Scroll Saw Blades", "Shearing Accessories", "Slide Compound / Miter Saw Accessories", "Slotted Bits", "Specialized Blades", "System Charts", "Table and Stand", "Table Saw Accessories", "Thin Cutting Wheels", "Trimmer, Router, Sash Router Accessories", "Wood", "Wood Cutting"};
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
stock frame = new stock();
frame.setVisible(true);
}
});
}
/**
* Create the frame.
*/
public stock() {
getContentPane().setBackground(new Color(176, 224, 230));
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100, 100, 664, 698);
setResizable(false);
setLocationRelativeTo(null);
getContentPane().setLayout(null);
// Customer List
ImageIcon titleIcon = new ImageIcon("C:\Users\Samir\Desktop\banner.jpg");
lblUpdateStock = new JLabel(titleIcon);
lblUpdateStock.setFont(new Font("Castellar", Font.BOLD, 28));
lblUpdateStock.setBounds(0, 0, 658, 111);
getContentPane().add(lblUpdateStock);
JLabel lblPartNo = new JLabel("Part No :");
lblPartNo.setFont(new Font("Bookman Old Style", Font.PLAIN, 16));
lblPartNo.setBounds(20, 132, 70, 14);
getContentPane().add(lblPartNo);
txtPartNo = new JTextField();
txtPartNo.setBounds(100, 127, 172, 24);
getContentPane().add(txtPartNo);
txtPartNo.setColumns(10);
lblcategory = new JLabel("Main Category");
lblcategory.setFont(new Font("Calisto MT", Font.PLAIN, 16));
lblcategory.setBounds(103, 173, 127, 24);
getContentPane().add(lblcategory);
lblSubcategory = new JLabel("Sub Category");
lblSubcategory.setFont(new Font("Bookman Old Style", Font.PLAIN, 16));
lblSubcategory.setBounds(432, 173, 107, 24);
getContentPane().add(lblSubcategory);
// ScrollPane
JScrollPane scrollPane2 = new JScrollPane();
scrollPane2.setBounds(20, 480, 617, 154);
getContentPane().add(scrollPane2);
// Table
table = new JTable();
scrollPane2.setViewportView(table);
// Button Update
JButton btnUpdate = new JButton("update");
btnUpdate.setBounds(274, 439, 107, 30);
btnUpdate.setFont(new Font("Copperplate Gothic Bold", Font.PLAIN, 18));
btnUpdate.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
try {
UpdateData();
PopulateData();
} catch (SQLException ex) {
Logger.getLogger(stock.class.getName()).log(Level.SEVERE, null, ex);
}
}
});
getContentPane().add(btnUpdate);
JScrollPane scrollPane = new JScrollPane();
scrollPane.setBounds(20, 202, 287, 226);
getContentPane().add(scrollPane);
main_list = new JList(categories);
scrollPane.setViewportView(main_list);
main_list.setFont(new Font("Simplified Arabic Fixed", Font.PLAIN, 15));
main_list.setVisibleRowCount(3);
main_list.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
scrollPane_1 = new JScrollPane();
scrollPane_1.setBounds(336, 202, 301, 226);
getContentPane().add(scrollPane_1);
sub_list = new JList(sub_categories);
scrollPane_1.setViewportView(sub_list);
sub_list.setFont(new Font("Simplified Arabic Fixed", Font.PLAIN, 15));
sub_list.setVisibleRowCount(3);
sub_list.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
PopulateData();
table.addMouseListener(new MouseAdapter() {
public void mouseClicked(MouseEvent e) {
if (e.getClickCount() == 1) {
JTable target = (JTable) e.getSource();
selectedRow[index] = target.getSelectedRow();
int selectedColumn = 0;
selectedCellValue[index] = target.getValueAt(selectedRow[index], selectedColumn);
index++;
}
}
});
}
private static void PopulateData() {
// Clear table
table.setModel(new DefaultTableModel());
// Model for Table
DefaultTableModel model = new DefaultTableModel() {
public Class<?> getColumnClass(int column) {
switch (column) {
case 0:
return String.class;
case 1:
return String.class;
case 2:
return String.class;
case 3:
return String.class;
case 4:
return Boolean.class;
default:
return String.class;
}
}
};
table.setModel(model);
// Add Column
// model.addColumn("Select");
model.addColumn("product_code");
model.addColumn("description");
model.addColumn("main_category");
model.addColumn("sub_category");
model.addColumn("Select");
Connection con = null;
Statement s = null;
try {
//Change this
// Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
// con = DriverManager.getConnection("jdbc:odbc:Project");
try{
Class.forName("com.mysql.jdbc.Driver").newInstance();
} catch (InstantiationException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
con = DriverManager.getConnection("jdbc:mysql://192.168.1.254/asser_old?user=&password=");
s = con.createStatement();
String sql = "SELECT product_code, description, main_category,sub_category FROM stock";
ResultSet rec = s.executeQuery(sql);
int row = 0;
while ((rec != null) && (rec.next())) {
model.addRow(new Object[0]);
model.setValueAt(false, row, 4); // Checkbox
model.setValueAt(rec.getString("product_code"), row, 0);
model.setValueAt(rec.getString("description"), row, 1);
model.setValueAt(rec.getString("main_category"), row, 2);
model.setValueAt(rec.getString("sub_category"), row, 3);
row++;
}
} catch (Exception e) {
// TODO Auto-generated catch block
JOptionPane.showMessageDialog(null, e.getMessage());
e.printStackTrace();
}
}
private void UpdateData() throws SQLException {
Connection connect = null;
Statement s = null;
ResultSet rs = null;
try{
Class.forName("com.mysql.jdbc.Driver").newInstance();
} catch (InstantiationException e) {
e.printStackTrace();
} catch (IllegalAccessException e) {
e.printStackTrace();
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
connect = DriverManager.getConnection("jdbc:mysql://192.168.1.254/asser_old?user=&password=");
System.out.println("Connected");
s = connect.createStatement();
String part = "";
String partno = txtPartNo.getText().toString();
String Descrip = "";
String cat = "";
String subcat = "";
String category = main_list.getSelectedValue().toString();
String sub_category = sub_list.getSelectedValue().toString();
String query = "Select description,main_category,sub_category from stock where product_code ='" + partno + "'";
stmt = connect.createStatement();
rs = stmt.executeQuery(query);
while (rs.next()) {
Descrip = rs.getString("description");
cat = rs.getString("main_category");
subcat = rs.getString("sub_category");
}
String query2 = "UPDATE stock SET main_category='" + category + "',sub_category='" + sub_category + "' where product_code ='" + partno + "'";
stmt.executeUpdate(query2);
System.out.println("Updated");
txtPartNo.setText("");
txtPartNo.requestFocus();
System.out.println(selectedCellValue[index]);
for (int count = 0; count < index; count++) {
String sql = "select * from stock where product_code = '" + selectedCellValue[count] + "' ";
rs = s.executeQuery(sql);
String sql2 = "UPDATE stock SET main_category='" + category + "',sub_category='" + sub_category + "' where product_code = '" + selectedCellValue[count] + "'";
s.executeUpdate(sql2);
}
}
@Override
public void mousePressed(MouseEvent e) {
}
@Override
public void mouseReleased(MouseEvent e) {
}
@Override
public void mouseEntered(MouseEvent e) {
}
@Override
public void mouseExited(MouseEvent e) {
}
@Override
public void mouseClicked(MouseEvent arg0) {
}
}
一个基本的想法是将 table/model 中的数据重置回 false，例如..
for (int row = 0; row < table.getRowCount(); row++) {
if (table.getValueAt(row, 4) == Boolean.TRUE) {
table.setValueAt(Boolean.FALSE, row, 4);
}
}
仔细查看 How to Use Tables 了解更多详情
已更新
去掉selectedCellValue，简直就是乱七八糟的事情
只需使用类似上述的内容来构建 List 个所选项目
List<Integer> selectedRows = new ArrayList<>(25);
for (int row = 0; row < table.getRowCount(); row++) {
if (table.getValueAt(row, 4) == Boolean.TRUE) {
selectedRows.add(row);
}
}
然后像...
for (int row : selectedRows) {
int code = table.getValueAt(row, 0);
String sql = "select * from stock where product_code = '" + code + "' ";
// Blah, blah, blah...
获取所选行所需的值。当然，您可以将这两种想法结合起来，使用一个循环代替...
您让您的数据库资源处于危险的无人管理状态，这可能会降低您的应用程序的性能，并导致数据库服务器在这些资源的使用寿命之外保持打开的连接。
查看 The try-with-resources Statement 一些关于如何更好地管理资源的想法。请记住，如果打开它，则必须关闭它。
您也迫切需要了解 Using Prepared Statements