结对作业（地铁查询项目）01

结对作业的第一天，我们做了开发计划，准备先从后端入手，构建项目
package Bean;
import java.sql.*;
public class DBBean {
    private String driverStr = "com.mysql.jdbc.Driver";
    private String connStr = "jdbc:mysql://localhost:3306/user";
    private String dbusername = "root";
    private String dbpassword = "20223959";
    private Connection conn = null;
    private Statement stmt = null;

    public DBBean() {
        try {
            Class.forName(driverStr);
            conn = DriverManager.getConnection(connStr, dbusername, dbpassword);
            stmt = conn.createStatement();
        } catch (Exception ex) {
            System.out.println(ex.getMessage());
            System.out.println("数据连接失败！");
        }

    }

    public int executeUpdate(String s) {
        int result = 0;
        System.out.println("--更新语句:" + s + "\n");
        try {
            result = stmt.executeUpdate(s);
        } catch (Exception ex) {
            System.out.println("执行更新错误！");
        }
        return result;
    }
    public ResultSet executeQuery(String s) {
        ResultSet rs = null;
        System.out.print("--查询语句:" + s + "\n");
        try {
            rs = stmt.executeQuery(s);
        } catch (Exception ex) {
            System.out.println("执行查询错误！");
        }
        return rs;
    }

    public void execQuery(String s) {
        try {
            stmt.executeUpdate(s);
        } catch (SQLException e) {

            System.out.println("执行插入错误！");
        }
    }

    public void close() {
        try {
            stmt.close();
            conn.close();
        } catch (Exception e) {
        }
    } }