第15周作业--JDBC连接数据库

编写一个应用程序，输入用户名和密码，访问test数据库中t_login表（字段包括id、username、password），验证登录是否成功。当登录成功后，将t_user表（id、name、sex、birthday）的信息进行显示（要求使用DB.java完成登录和获取t_user表中数据的操作），最后再对t_user表进行一条记录的添加操作。

 

package com;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.Scanner;

public class Test2 {

	public static void main(String[] args) {
		Scanner reader = new Scanner(System.in);
		System.out.println("请输入用户名");
		String uesrname = reader.next();
		System.out.println("密码");
		String password = reader.next();
		Connection con = null;
		PreparedStatement ps = null;
		ResultSet rs = null;
		try {
			Class.forName("com.mysql.jdbc.Driver");
			con = DriverManager.getConnection("jdbc:mysql://localhost:3306/db", "root", "");
			String sql = "select * from t_login where username=? and password=?";
			String sql2 = "select * from t_user";
			String sql3 = "insert into t_user(name,sex,birthday) values(?,?,?)";
			ps = con.prepareStatement(sql);
			ps.setString(1, uesrname);
			ps.setString(2, password);
			rs = ps.executeQuery();
			if (rs.next()) {
				System.out.println("登录成功！");

			} else {
				System.out.println("登录失败！");
			}

			rs = ps.executeQuery(sql2);
			System.out.println("");
			System.out.println("显示所有成员信息：");
			while (rs.next()) {
				String name = rs.getString(2);
				System.out.println("name    :" + name);
				int sex = rs.getInt(3);
				if (sex == 1) {
					System.out.println("sex     :男");
				} else {
					System.out.println("sex     :女");
				}
				String birthday = rs.getString(4);
				System.out.println("birthday:" + birthday);
			}
			ps = con.prepareStatement(sql3);
			System.out.println("请输入姓名：");
			String name = reader.next();
			ps.setString(1, name);
			System.out.println("请输入性别，1代表男，2代表女");
			int sex = reader.nextInt();
			ps.setInt(2, sex);
			System.out.println("请输入出生日期：");
			String birthday = reader.next();
			ps.setString(3, birthday);
			int count = ps.executeUpdate();
			if (count > 0) {
				System.out.println("插入成功");
			} else {
				System.out.println("插入失败");
			}

		} catch (ClassNotFoundException e) {

			e.printStackTrace();
		} catch (SQLException e) {
			e.printStackTrace();
		} finally {
			if (rs != null) {
				try {
					rs.close();
					ps.close();
					con.close();
				} catch (SQLException e) {

					e.printStackTrace();
				}
			}

		}

	}

}