Java 简单mysql数据库实现增删查改——（含步骤）

工具：eclipse
　　　mysql-5.5.40-win64
　　　MySQL连接驱动：mysql-connector-java-5.1.7-bin.jar
加载驱动：
　　1. 在工程目录中创建lib文件夹，将下载好的JDBC放到该文件夹下，如下图所示：
　　
　　2. 右键工程名，在java build path中的Libraries分页中选择Add JARs…，选择刚才添加的JDBC，如下图：
　　
　　连接数据库并读取数据：
　　数据库名称：day2
　　数据表名称：book
　　端口号：3306
　　用户名：root
　　密码：root
　　

package mysql;

import java.io.*;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Scanner;
public class Mysql {

    static String driver="com.mysql.jdbc.Driver"; 
    static String url="jdbc:mysql://localhost:3306/day2";
    static String use="root";
    static String password="root";
    static int number;
    static Connection conn;

    public static void displayMainUI() {
        System.out.println("欢迎使用图书管理系统!");
        System.out.println("请输入数字 : ");
        System.out.println("1) 查看图书");
        System.out.println("2) 增加图书");
        System.out.println("3) 修改图书");
        System.out.println("4) 删除图书");
        System.out.println("5) 导出数据");
        System.out.println("6) 导入数据");
    }

    public static void Cha() throws Exception {
        System.out.println("查看图书");
        //3.操作数据库，实现增删改查
        Statement stmt = conn.createStatement();
        ResultSet rs = stmt.executeQuery("SELECT id, sname, price FROM book;");
        //如果有数据，rs.next()返回true
        while(rs.next()){
            System.out.println("id: " + rs.getInt("id")
                    + " 书名: " + rs.getString("sname") 
                    + " 价格："+rs.getInt("price"));
        }        
    }

    public static void add() throws Exception {
       System.out.println("增加图书");
       Scanner ms = new Scanner(System.in);
       System.out.println("请输入id:");
       String number = ms.next();
       System.out.println("请输入sname:");
       String sname = ms.next();
       System.out.println("请输入price:");
       int price = ms.nextInt();
       Statement stmt = conn.createStatement();
       String sql = "insert into book  values ("+number+",\"" + sname
               + "\", " + price + ");"; 
       System.out.println("sql 语法: " + sql);
       stmt.execute(sql);   

    }

    public static void Gai() throws Exception {
        Cha();
        System.out.println("修改图书");
        Statement stmt = conn.createStatement();
        Scanner ms = new Scanner(System.in);
        System.out.println("请输入id:");
        int id = ms.nextInt();      
        System.out.println("请输入sname:");
        String sname = ms.next();
        System.out.println("请输入price:");
        int price = ms.nextInt();       
        String sql = "update book set price = " + price 
                + ", sname = \"" + sname 
                + "\" where id = " + id;
        System.out.println("sql 语法: " + sql);
        stmt.execute(sql);
    }

    public static void delete() throws Exception {
        System.out.println("已经输入4");
        //3.操作数据库，实现增删改查
        Statement stmt = conn.createStatement();
        stmt.execute("delete from book");       
    }

    public static void daochu()  throws Exception {
        System.out.println("导出数据");
        String output = "";
        output = output + "id\t书名\t价格\n\t";

        Statement stmt = conn.createStatement();
        ResultSet rs = stmt.executeQuery("SELECT id, sname, price FROM book;");
        //如果有数据，rs.next()返回true
        while(rs.next()){
            output = output + rs.getInt("id") + "\t"
                    + rs.getString("sname") + "\t"
                    +rs.getInt("price") + "\n\t";
        }  
//      System.out.println(output);
        try {
            BufferedWriter out = new BufferedWriter(new FileWriter("e:\\book.txt"));
            out.write(output);
            out.close();
        } catch (Exception e) {
            System.out.println("就知道会出现问题");
            System.out.println(e);
            return;
        }
        System.out.println("成功导出数据!");
    }

    public static void daorru() {
        System.out.println("导入数据");
    }

    public static void main(String args[]) throws Exception
    { 
        displayMainUI();
        Scanner ms = new Scanner(System.in);
        //1.加载驱动程序
        Class.forName(driver);
        //2. 获得数据库连接
        conn = DriverManager.getConnection(url, use, password);

        while (true) {
            int a = ms.nextInt();

            switch(a) {
            case 1:
                Cha();//查看图书
                break;
            case 2:
                add();//增加图书
                break;
            case 3:
                Gai();//修改图书
                break;
            case 4:
                delete();//删除图书
                break;
            case 5:
                daochu();//导出数据
                break;
            case 6:
                daorru();//导入数据
                break;
            }
        }

    }
}

运行结果：


　　
　　



mysql安装教程及安装包：https://download.csdn.net/download/m0_37738838/10512164
源代码工程及效果图下载：https://download.csdn.net/download/m0_37738838/10529500