补补补补1月TAT
回想起1月的事情，最讓我印象深刻又痛苦的當然是JAVA最后的大作業了
枉我懸賞100圓豆都解決不了問題 桑心
廢話不多說 ，我絕對不承認我是在湊字數，~\(≧▽≦)/~啦啦啦
下面是正題
寫了2個包，一個是Main 一個是Swing
Main里面只有2個java，一個是與數據庫建立連接的，一個是主界面運行的
//Main.java
public class Main
{
public static void main(String[] args)
{
Login l=new Login();
l.setLocationRelativeTo(null);//窗口居中
l.setVisible(true);//窗口顯示
}
}
//DBlink.java
package Main;
import java.sql.Connection;
import java.sql.DriverManager;
public class DBlink
{
public Connection con=null;
public DBlink()
{
String driverName="com.microsoft.sqlserver.jdbc.SQLServerDriver";
String dbURL="jdbc:sqlserver://localhost:1434;DatabaseName=BusSystem";
String userName="sa"; //默認用戶名
String userPwd="000000"; //密碼
try{
Class.forName(driverName);
con=DriverManager.getConnection(dbURL,userName,userPwd);
System.out.println("連接成功！"); //如果連接成功，控制臺輸出“連接成功！”
}catch(Exception e)
{
System.out.println("連接失敗！");
e.printStackTrace();
}
}
}
接下來是Swing包里的內容
圖形界面還是挺容易搭建的，感覺和畫圖出不多，= =
關鍵是寫好監聽器就好了，當然這個也挺容易的
eg：
JButton button_2 = new JButton();//一個button
button_2.addMouseListener(new MouseAdapter() {
@Override
public void mouseClicked(MouseEvent arg0) //鼠標點擊時完成的動作
{
JOptionPane.showMessageDialog(null, "感謝您的使用！", "對話框",
JOptionPane.PLAIN_MESSAGE);//顯示對話框，提示感謝您的使用
System.exit(0);//退出系統
}
});
button_2.setText("\u9000\u51FA");//退出的文本
當然還有窗口的顯示和隱藏
setVisible(false);//當前窗口的隱藏
Window lo = new Window();
lo.setLocationRelativeTo(null);//在屏幕正中間顯示
lo.setVisible(true);//新窗口的顯示
?
到了最蛋疼的部分，TAT
就是與數據庫連接后對數據進行查詢，添加，刪除，修改，并顯示在Jtable的表格里
//查詢
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
??????? sp = "bus";
??????? String[] data = new String[6];
??????? DBlink a = new DBlink();
??????? PreparedStatement p = null;//命令對象
??????? ResultSet rs = null;//結果集對象
??????? String s[] = { "NUMBER", "TYPE", "ENGINE NUMBER", "SEATING CAPACITY", "ROUTE", "AD" };
??????? String sql = "select * from bus";
??????? DefaultTableModel model = (DefaultTableModel) this.jTable1.getModel();
??????? int numT;//表格已有數據的行數
??????? numT = model.getRowCount();//獲取當前已有行數??
??????? while (numT > 0) //如果是全體刷新表格需要移除之前的所有數據行
??????? {
??????????? model.removeRow(0);
??????????? numT--;
??????? }
??????? int i;
??????? for (i = 0; i < s.length; i++) {
??????????? model.setColumnIdentifiers(s);
??????? }
??????? try {
??????????? p = a.con.prepareStatement(sql);//命令對象
??????????? rs = p.executeQuery();
??????????? while (rs.next()) {
??????????????? data[0] = rs.getString("number").trim();
??????????????? data[1] = rs.getString("type").trim();
??????????????? data[2] = rs.getString("engine_numbe").trim();
??????????????? data[3] = rs.getString("seating_capacity").trim();
??????????????? data[4] = rs.getString("route").trim();
??????????????? data[5] = rs.getString("ad").trim();
??????????????? model.addRow(data);
??????????? }
??????????? jTable1.setModel(model);//將修改后的model傳回給JTable*
??????????? a.con.close();
??????????? p.close();
??????????? rs.close();
??????? } catch (SQLException e) {
??????????? e.printStackTrace();
??????? }
??? }
//添加
??? public void add() {
??????? DBlink a = new DBlink();
??????? PreparedStatement p = null;//命令對象
??????? try {
??????????? this.number=Integer.parseInt(jTextField6.getText());
??????????? this.type = jTextField1.getText();
??????????? this.engine_numbe = Integer.parseInt(jTextField2.getText());
??????????? this.seating_capacity = Integer.parseInt(jTextField3.getText());
??????????? this.route = Integer.parseInt(jTextField4.getText());
??????????? this.ad = jTextField5.getText();
??????? } catch (NumberFormatException e) {
??????????? JOptionPane.showMessageDialog(null, "輸入數據格式錯誤！", "錯誤",
??????????????????? JOptionPane.WARNING_MESSAGE);
??????????? return;
??????? }
??????? Object[] value = { "是", "否", "取消" };
??????? int result = JOptionPane.showOptionDialog(null, "確定添加", "警告", 2, 2,
??????????????? null, value, value[0]);
??????? if (result == 0) {
??????????? String sql2 = "insert into? bus(number,type,engine_numbe,seating_capacity,route,ad) values(?,?,?,?,?,?)";
??????????? try {
??????????????? p = a.con.prepareStatement(sql2);//命令對象
??????????????? p.setInt(1, number);
??????????????? p.setString(2, type);
??????????????? p.setInt(3, engine_numbe);
??????????????? p.setInt(4, seating_capacity);
??????????????? p.setInt(5, route);
??????????????? p.setString(6, ad);
???????????????
??????????????? p.execute();
??????????????? JOptionPane.showMessageDialog(null, "添加成功");
??????????????? a.con.close();
??????????????? p.close();
??????????? } catch (SQLException e) {
??????????????? //JOptionPane.showMessageDialog(null, "數據庫連接錯誤！", "錯誤",
??????????????????? //? JOptionPane.WARNING_MESSAGE);
??????????? }
??????? ???? catch (NumberFormatException e) {
??????????????? JOptionPane.showMessageDialog(null, "輸入數據格式錯誤！", "錯誤",
??????????????????????? JOptionPane.WARNING_MESSAGE);
??????????? }
??????? }
?
??????? refresh();
??? }
//修改
??? public void update() {
??????? DBlink a = new DBlink();
??????? PreparedStatement p = null;//命令對象
??????? ResultSet rs = null;//結果集對象
??????? try {
??????????? this.number = Integer.parseInt(jTextField6.getText());
??????????? this.type = jTextField1.getText();
??????????? this.engine_numbe = Integer.parseInt(jTextField2.getText());
??????????? this.seating_capacity = Integer.parseInt(jTextField3.getText());
??????????? this.route = Integer.parseInt(jTextField4.getText());
??????????? this.ad = jTextField5.getText();
??????? } catch (NumberFormatException e) {
??????????? JOptionPane.showMessageDialog(null, "輸入數據格式錯誤！", "錯誤",
??????????????????? JOptionPane.WARNING_MESSAGE);
??????????? return;
??????? }
??????? Object[] value = { "是", "否", "取消" };
??????? int result = JOptionPane.showOptionDialog(null, "確定修改此", "警告", 2, 2,
??????????????? null, value, value[0]);
??????? if (result == 0) {
??????????? String sql1 = "select * from bus where number=?";
??????????? String sql2 = "update? bus set type=?,engine_numbe=?,seating_capacity=?,route=?,ad=? where number=?";
??????????? try {
??????????????? p = a.con.prepareStatement(sql1);//命令對象
??????????????? p.setInt(1, number);
??????????????? rs = p.executeQuery();
??????????????? if (rs.next() && rs.getRow() > 0) {
??????????????????? p = a.con.prepareStatement(sql2);//命令對象
??????????????????? p.setString(1, type);
??????????????????? p.setInt(2, engine_numbe);
??????????????????? p.setInt(3, seating_capacity);
??????????????????? p.setInt(4, route);
??????????????????? p.setString(5, ad);
??????????????????? p.setInt(6, number);
??????????????????? p.execute();
??????????????? } else {
??????????????????? JOptionPane.showMessageDialog(null, "不存在您要修改的車輛不存在", "錯誤",
??????????????????????????? JOptionPane.WARNING_MESSAGE);
??????????????? }
??????????????? a.con.close();
??????????????? p.close();
??????????????? rs.close();
??????????? } catch (SQLException e) {
??????????????? JOptionPane.showMessageDialog(null, "數據庫連接錯誤！", "錯誤",
??????????????????????? JOptionPane.WARNING_MESSAGE);
??????????? } catch (NumberFormatException e) {
??????????????? JOptionPane.showMessageDialog(null, "輸入數據格式錯誤！", "錯誤",
??????????????????????? JOptionPane.WARNING_MESSAGE);
??????????? }
??????? }
?
??????? refresh();
??? }
//刪除
??? public void delete() {
??????? jTextField1.setEditable(true);
??????? DBlink a = new DBlink();
??????? PreparedStatement p = null;//命令對象
??????? ResultSet rs = null;//結果集對象
??????? try {
??????????? this.number = Integer.parseInt(jTextField6.getText());
??????? } catch (NumberFormatException e) {
??????????? JOptionPane.showMessageDialog(null, "輸入數據格式錯誤！", "錯誤",
??????????????????? JOptionPane.WARNING_MESSAGE);
??????????? return;
??????? }
??????? if (jTextField1.equals(null)) {
??????????? JOptionPane.showMessageDialog(this, "序號不能為空", "錯誤",
??????????????????? JOptionPane.WARNING_MESSAGE);
??????????? return;
??????? }
??????? Object[] value = { "是", "否", "取消" };
??????? int result = JOptionPane.showOptionDialog(null, "確定刪除此", "警告", 2, 2,
??????????????? null, value, value[0]);
??????? if (result == 0) {
??????????? String sql1 = "select * from bus where number=?";
??????????? String sql2 = "delete from bus where number=?";
??????????? try {
??????????????? p = a.con.prepareStatement(sql1);//命令對象
??????????????? p.setInt(1, number);
??????????????? rs = p.executeQuery();
??????????????? if (rs.next() && rs.getRow() > 0) {
??????????????????? p = a.con.prepareStatement(sql2);//命令對象
??????????????????? p.setInt(1, number);
??????????????????? p.execute();
??????????????????? JOptionPane.showMessageDialog(null, "刪除成功！");
??????????????? } else {
??????????????????? JOptionPane.showMessageDialog(null, "不存在您要刪除的車輛", "錯誤",
??????????????????????????? JOptionPane.WARNING_MESSAGE);
??????????????? }
??????????????? a.con.close();
??????????????? p.close();
??????????????? rs.close();
??????????? } catch (SQLException e) {
??????????????? JOptionPane.showMessageDialog(null, "數據庫連接錯誤！", "錯誤",
??????????????????????? JOptionPane.WARNING_MESSAGE);
??????????? } catch (NumberFormatException e) {
??????????????? JOptionPane.showMessageDialog(null, "輸入數據格式錯誤！", "錯誤",
??????????????????????? JOptionPane.WARNING_MESSAGE);
??????????? }
??????? }
?
??????? refresh();
?
??? }
一月份的內容到此結束！
?
轉載于:https://www.cnblogs.com/shmilykk/archive/2013/02/19/2917664.html
總結
- 上一篇： windows8中的数据上下文和简单的L
- 下一篇： 面试题分享【不断更新】