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  • java小程序电话簿

    实现功能增删改查,需要连接sql server

    package com_wy;
    
    import java.sql.*;
    import java.util.ArrayList;
    import java.util.List;
    import java.util.Scanner;
    
    public class Findphone {
        public  static Connection con;
        Statement sta;
        ResultSet res;
        String name;
        String number;
        public void  connectsql(){
            String URL = "jdbc:sqlserver:// localhost: 1433; DatabaseName = Phone;";
            String USER = "admin";
            String PASSWORD = "admin";
            try {
                Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
            } catch (ClassNotFoundException e) {
                e.printStackTrace();
            }
            try {
                con = (Connection) DriverManager.getConnection(URL,USER,PASSWORD);
                System.out.println("连接成功");
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        public void inserts(){
            try {
                sta = con.createStatement();
            } catch (SQLException e) {
                e.printStackTrace();
            }
            Scanner sc = new Scanner(System.in);
            System.out.println("请输入新增name:");
            name = sc.nextLine();
            System.out.println("请输入新增number:");
            number = sc.nextLine();
            String str = "insert into phonebook(name,number) values('"+name+"',"+number+")";
    
            try {
                sta.executeUpdate(str);
                System.out.println("添加成功");
            } catch (SQLException e) {
    
                System.out.println(e.getMessage());
                System.out.println("添加失败");
            }
        }
        public void finds(){
            List<PhoneInformation> list = new ArrayList<>();
    
            try {
                sta = con.createStatement();
            } catch (SQLException e) {
                e.printStackTrace();
            }
            Scanner sc = new Scanner(System.in);
            System.out.println("请输入查找name:");
            name = sc.nextLine();
            String str = "select number from phonebook where name='"+name+"'";
            try {
                res = sta.executeQuery(str);
            } catch (SQLException e) {
                e.printStackTrace();
            }
            try {
                while (res.next()){
    
                    System.out.println(res.getString("number"));
                }
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        public void updates(){
            try {
                sta = con.createStatement();
            } catch (SQLException e) {
                e.printStackTrace();
            }
            Scanner sc = new Scanner(System.in);
            System.out.println("请输入修改name:");
            name = sc.nextLine();
            System.out.println("请输入修改number:");
            number = sc.nextLine();
            String str = "update phonebook set number='"+number+"' where name='"+name+"'";
            try {
                sta.executeUpdate(str);
                System.out.println("修改成功");
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
        public void deletes(){
            try {
                sta = con.createStatement();
            } catch (SQLException e) {
                e.printStackTrace();
            }
            Scanner sc = new Scanner(System.in);
            System.out.println("请输入删除修改name:");
            name = sc.nextLine();
            String str = "delete from phonebook where name = '"+name+"'";
            try {
                sta.executeUpdate(str);
                System.out.println("删除成功");
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    
        public static void main(String[] args) {
            int num=0;
            Findphone findphone = new Findphone();
            findphone.connectsql();
            System.out.println("1.新增");
            System.out.println("2.查找");
            System.out.println("3.修改");
            System.out.println("4.删除");
            Scanner sc = new Scanner(System.in);
            System.out.println("请选择:");
            num = sc.nextInt();
    
            switch (num){
                case 1: findphone.inserts();  break;
                case 2: findphone.finds();  break;
                case 3: findphone.updates();  break;
                case 4: findphone.deletes();  break;
            }
            try {
                con.commit();
            } catch (SQLException e) {
                e.printStackTrace();
            }
            try {
                con.close();
            } catch (SQLException e) {
                e.printStackTrace();
            }
        }
    }
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  • 原文地址:https://www.cnblogs.com/gc56-db/p/9876856.html
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