帮我看看为啥数据修改显示成功但是没成功
程序代码：
package com.library.Dao;
//数据库的操作类：驱动程序加载、数据库连接、连接关闭方法
import java.sql.*;
public class GetConnection {
private Connection conn;//定义连接对象
private String user="sa";//默认用户名
private String password = "199738"; //密码
private String className = "com.microsoft.sqlserver.jdbc.SQLServerDriver"; //加载JDBC驱动
private String url = "jdbc:sqlserver://localhost:1433; DatabaseName=library"; //连接服务器和数据库
public GetConnection()
{
try
{
Class.forName(className);
}catch(ClassNotFoundException e){
System.out.println("数据库连接失败！");
e.printStackTrace();
}
}
public Connection getCon()
{
try{
conn=DriverManager.getConnection(url,user,password);
}catch(SQLException e)
{
System.out.println("数据库驱动加载失败！");
e.printStackTrace();
}
return conn;
}
public int executeUpdate(String sql) {
try {
if(conn==null)
new GetConnection();
return conn.createStatement().executeUpdate(sql);
} catch (SQLException e) {
System.out.println(e.getMessage());
return -1;
} finally {
}
}
public ResultSet executeQuery(String sql) {
try {
if(conn==null)
new GetConnection();
return conn.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE,ResultSet.CONCUR_UPDATABLE).executeQuery(sql);
} catch (SQLException e) {
e.printStackTrace();
return null;
} finally {
}
}
public void closed()
{
try{
if(conn!=null) conn.close();
}catch(SQLException e)
{
System.out.println("连接关闭失败！");
e.printStackTrace();
}
}
}
package com.library.Dao;
import java.sql.Connection;
import com.library.Dao.GetConnection;;
public class UpdatebookType {
Connection conn=null;
public GetConnection connection=new GetConnection();
public int UpdatebookType(String id,String typeName){
int i=0;
conn=connection.getCon();
try{
String sql="update tb_bookType set name='"+typeName+"'where type_id='"+id+"'";
i=connection.executeUpdate(sql);
}catch(Exception e){
e.printStackTrace();
}
connection.closed();
return i;
}
}
package com.library.Dao;
import java.sql.*;
import java.util.ArrayList;
import java.util.List;
import com.library.Dao.GetConnection;
import com.library.bean.BookType;;
public class UpdateBookTypeDao {
Connection conn=null;
public GetConnection connection=new GetConnection();
public List UpdateBookType(){
List list=new ArrayList();
String sql = "select * from tb_booktype";
conn=connection.getCon();
ResultSet rs = connection.executeQuery(sql);
try {
while (rs.next()) {
BookType bookType=new BookType();
bookType.setType_id(rs.getInt("type_id"));
bookType.setName(rs.getString("name"));
list.add(bookType);
}
} catch (Exception e) {
e.printStackTrace();
}
connection.closed();
return list;
}
}
package com.library.mainFrame;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JTable;
import javax.swing.JComboBox;
import java.awt.Font;
import javax.swing.JButton;
import javax.swing.JTextField;
import java.awt.event.ActionListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.util.List;
import java.awt.event.ActionEvent;
import java.awt.Color;
import com.library.bean.BookType;
import com.library.bean.Item;
import com.library.Dao.UpdateBookTypeDao;
import com.library.Dao.UpdatebookType;
import javax.swing.JScrollPane;
import javax.swing.table.DefaultTableModel;
import javax.swing.DefaultComboBoxModel;
import javax.swing.ImageIcon;
public class UpdateBookType extends JFrame {
/**
*
*/
private static final long serialVersionUID = 1L;
private JPanel contentPane;
private JTextField textField;
private JTable table;
private JTextField BookTypeId;
private String[] columnNames={"图书类别编号", "图书类别名称"};
DefaultTableModel model;
DefaultComboBoxModel bookTypeModel;
UpdatebookType update=new UpdatebookType();
UpdateBookTypeDao updateBOOK=new UpdateBookTypeDao();
/**
* Launch the application.
*/
private Object[][] getFileStates(List list){
Object[][]results=new Object[list.size()][columnNames.length];
for(int i=0;i<list.size();i++){
BookType booktype=(BookType)list.get(i);
results[i][0]=booktype.getType_id();
results[i][1]=booktype.getName();
}
return results;
}
/**
* Create the frame.
*/
public UpdateBookType() {
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setBounds(100, 100, 554, 427);
contentPane = new JPanel();
contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
setContentPane(contentPane);
contentPane.setLayout(null);
JLabel label = new JLabel("");
label.setIcon(new ImageIcon(UpdateBookType.class.getResource("/com/library/images/UpdateBookType.jpg")));
label.setBounds(0, 0, 538, 88);
contentPane.add(label);
JComboBox comboBox = new JComboBox();
bookTypeModel= (DefaultComboBoxModel)comboBox.getModel();
List list=updateBOOK.UpdateBookType();
for(int i=0;i<list.size();i++){
BookType booktype=(BookType)list.get(i);
Item item=new Item();
item.setId(booktype.getType_id());
item.setName(booktype.getName());
bookTypeModel.addElement(item);
}
comboBox.setBounds(388, 165, 121, 30);
contentPane.add(comboBox);
JLabel label_1 = new JLabel("图书类型：");
label_1.setFont(new Font("宋体", Font.PLAIN, 18));
label_1.setBounds(272, 163, 90, 30);
contentPane.add(label_1);
JButton btnNewButton = new JButton("修改");
btnNewButton.addActionListener(new ButtonAddListener());
btnNewButton.setFont(new Font("宋体", Font.PLAIN, 12));
btnNewButton.setBounds(120, 337, 93, 23);
contentPane.add(btnNewButton);
JButton btnNewButton_1 = new JButton("关闭");
btnNewButton_1.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
new UpdateBookType();
UpdateBookType.this.dispose();
}
});
btnNewButton_1.setFont(new Font("宋体", Font.PLAIN, 12));
btnNewButton_1.setBounds(333, 337, 93, 23);
contentPane.add(btnNewButton_1);
JLabel label_2 = new JLabel("修改类型：");
label_2.setFont(new Font("宋体", Font.PLAIN, 18));
label_2.setBounds(272, 257, 90, 30);
contentPane.add(label_2);
textField = new JTextField();
textField.setFont(new Font("宋体", Font.PLAIN, 15));
textField.setBounds(388, 259, 121, 30);
contentPane.add(textField);
textField.setColumns(10);
model=new DefaultTableModel();
Object[][] results=getFileStates(updateBOOK.UpdateBookType());
model.setDataVector(results,columnNames);
JTable table = new JTable();
table.setModel(model);
table.setFont(new Font("宋体", Font.PLAIN, 13));
JScrollPane scrollPane = new JScrollPane(table);
scrollPane.setFont(new Font("宋体", Font.PLAIN, 18));
scrollPane.setBackground(Color.WHITE);
scrollPane.setBounds(20, 111, 247, 219);
contentPane.add(scrollPane);
BookTypeId = new JTextField();
BookTypeId.setBounds(388, 208, 121, 30);
contentPane.add(BookTypeId);
BookTypeId.setColumns(10);
}
class TableListener extends MouseAdapter {
public void mouseClicked(final MouseEvent e) {
int selRow = table.getSelectedRow();
BookTypeId.setText(table.getValueAt(selRow, 0).toString().trim());
bookTypeModel.setSelectedItem(table.getValueAt(selRow, 1).toString().trim());
}
}
class ButtonAddListener implements ActionListener{
public void actionPerformed(ActionEvent e){
Object selectedItem = bookTypeModel.getSelectedItem();
int i=update.UpdatebookType(BookTypeId.getText().trim(),selectedItem.toString());
System.out.println(i);
if(i==1){
JOptionPane.showMessageDialog(null, "修改成功!");
}
}
}
}
