第五周第一天（数据库）
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package com.day1_2015_08_10;import java.sql.Connection;import java.sql.DriverManager;import java.sql.ResultSet;import java.sql.SQLException;import java.sql.Statement;public class MySql { public static void main(String[] args) { // 连接数据库的驱动 String driver = "com.mysql.jdbc.Driver"; // URL指向要访问的数据库名 String url = "jdbc:mysql://localhost:3306/clazz"; // MySql配置时的用户名 String user = "root"; // java连接MySql配置时的密码 String password = "1149424898"; try { Class.forName(driver);// 加载驱动 Connection conn = DriverManager.getConnection(url, user, password); if (!conn.isClosed()) {//数据库是否关闭 // 数据库操作 Statement state = conn.createStatement();// String insert = "insert into student(stu_name,sex,age)values('李四',1,22)";//增// String delete="delete from student where stu_name='李四'";//删// String update="update student set age=20 where stu_name='李四'";//改 // state.execute(insert); String select = "select*from student";// 查 ResultSet set = state.executeQuery(select); set.first();// 先把游标移到第一位 while (!set.isAfterLast()) {//判断游标是否在最后一个后边 String name = set.getString("stu_name"); System.out.println(name); set.next();//游标下移 } System.out.println("执行成功"); } } catch (ClassNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } }}*******************
package com.day1_2015_08_10;import java.sql.Connection;import java.sql.DriverManager;import java.sql.ResultSet;import java.sql.SQLException;import java.sql.Statement;public class SQLManager { private Statement statement; private static SQLManager manager;// 静态的方法里只能用静态的属性 public static synchronized SQLManager newInstance() {// 加锁是为了防止多个线程运行的情况下新建多个manager if (manager == null) { manager = new SQLManager(); } return manager; } public Statement getStatement() { return statement; } public void setStatement(Statement statement) { this.statement = statement; } private SQLManager() { // 连接数据库的驱动 String driver = "com.mysql.jdbc.Driver"; // URL指向要访问的数据库名 String url = "jdbc:mysql://localhost:3306/clazz"; // MySql配置时的用户名 String user = "root"; // java连接MySql配置时的密码 String password = "1149424898"; try { Class.forName(driver);// 加载驱动 // 与数据库建立连接 Connection conn = DriverManager.getConnection(url, user, password); if (!conn.isClosed()) {// 数据库是否关闭 // 数据库操作 statement = conn.createStatement(); //创建一个user表 String creatTable = "CREATE TABLE if not exists user(id int(11) NOT NULL " + "PRIMARY KEY AUTO_INCREMENT," + "userName varchar(20) BINARY NOT NULL," + "password varchar(40) BINARY NOT NULL)"; statement.execute(creatTable); } System.out.println("执行成功"); } catch (ClassNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (SQLException e) { // TODO Auto-generated catch block e.printStackTrace(); } }}************************************package com.day1_2015_08_10;import java.awt.BorderLayout;import java.awt.EventQueue;import javax.swing.JFrame;import javax.swing.JPanel;import javax.swing.border.EmptyBorder;import java.awt.Color;import javax.swing.JTextField;import javax.swing.JLabel;import javax.swing.JButton;import java.awt.event.ActionListener;import java.sql.ResultSet;import java.sql.SQLException;import java.sql.Statement;import java.awt.event.ActionEvent;public class SQL extends JFrame { private JPanel contentPane; private JTextField textFieldPassword; private JTextField textFieldUserName; /** * Launch the application. */ public static void main(String[] args) { EventQueue.invokeLater(new Runnable() { public void run() { try { SQL frame = new SQL(); frame.setVisible(true); } catch (Exception e) { e.printStackTrace(); } } }); } /** * Create the frame. */ public SQL() { setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setBounds(100, 100, 450, 300); contentPane = new JPanel(); contentPane.setBackground(Color.PINK); contentPane.setBorder(new EmptyBorder(5, 5, 5, 5)); setContentPane(contentPane); contentPane.setLayout(null); textFieldPassword = new JTextField(); textFieldPassword.setBounds(159, 102, 120, 42); contentPane.add(textFieldPassword); textFieldPassword.setColumns(10); JLabel label = new JLabel("用户名"); label.setBounds(56, 50, 54, 15); contentPane.add(label); JLabel lblNewLabel = new JLabel("密码"); lblNewLabel.setBounds(56, 115, 54, 15); contentPane.add(lblNewLabel); textFieldUserName = new JTextField(); textFieldUserName.setBounds(159, 37, 120, 42); contentPane.add(textFieldUserName); textFieldUserName.setColumns(10); JButton btnNewButton = new JButton("注册"); btnNewButton.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { String userName =textFieldUserName.getText(); String password =textFieldPassword.getText(); Statement state =SQLManager.newInstance().getStatement(); String sql="select count(*)from user where userName='"+userName+"'"; String regex ="^[0-9a-zA-Z]{8,16}$" ; if (password.matches(regex)) { System.out.println(password+"是一个合法的密码格式"); }else{ System.out.println(password+"不是一个合法的密码格式"); } try { ResultSet set =state.executeQuery(sql); set.first(); int num =set.getInt(1); if(num>0){ System.out.println("该用户已存在"); }else{ String register ="insert into user(userName,password)values('"+userName+"','"+password+"')"; state.execute(register); System.out.println("注册成功"); } } catch (SQLException e1) { // TODO Auto-generated catch block e1.printStackTrace(); } } }); btnNewButton.setBounds(159, 191, 120, 36); contentPane.add(btnNewButton); }}***********************************package com.day1_2015_08_10;import java.awt.BorderLayout;import java.awt.EventQueue;import javax.swing.JFrame;import javax.swing.JPanel;import javax.swing.border.EmptyBorder;import javax.swing.JTextField;import javax.swing.JLabel;import javax.swing.JButton;import java.awt.Color;import java.awt.event.ActionListener;import java.sql.ResultSet;import java.sql.SQLException;import java.sql.Statement;import java.awt.event.ActionEvent;public class Signin extends JFrame { private JPanel contentPane; private JTextField textFielduserName; private JTextField textFieldpassword; /** * Launch the application. */ public static void main(String[] args) { EventQueue.invokeLater(new Runnable() { public void run() { try { Signin frame = new Signin(); frame.setVisible(true); } catch (Exception e) { e.printStackTrace(); } } }); } /** * Create the frame. */ public Signin() { setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setBounds(100, 100, 450, 300); contentPane = new JPanel(); contentPane.setBackground(Color.PINK); contentPane.setBorder(new EmptyBorder(5, 5, 5, 5)); setContentPane(contentPane); contentPane.setLayout(null); textFielduserName = new JTextField(); textFielduserName.setBounds(156, 46, 93, 38); contentPane.add(textFielduserName); textFielduserName.setColumns(10); textFieldpassword = new JTextField(); textFieldpassword.setBounds(156, 111, 93, 38); contentPane.add(textFieldpassword); textFieldpassword.setColumns(10); JLabel lblNewLabeluserName = new JLabel("用户名"); lblNewLabeluserName.setBounds(48, 49, 54, 15); contentPane.add(lblNewLabeluserName); JLabel lblNewLabelPassword = new JLabel("密码"); lblNewLabelPassword.setBounds(48, 114, 54, 15); contentPane.add(lblNewLabelPassword); JButton btnNewButton = new JButton("登录"); btnNewButton.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { String userName = textFielduserName.getText(); String password = textFieldpassword.getText(); Statement state=SQLManager.newInstance().getStatement(); String sql ="select * from user where BINARY userName='"+userName+"'and password='"+password+"'"; //BINARY 区分大小写 try { ResultSet set =state.executeQuery(sql); set.last(); int num=set.getRow(); System.out.println(num); } catch (SQLException e1) { // TODO Auto-generated catch block e1.printStackTrace(); } } }); btnNewButton.setBounds(156, 185, 93, 23); contentPane.add(btnNewButton); }} 0 0
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