1, the database requirements:
mysql database, the new database in a tbtest mysql database, the new person table in tbtest library. Fields are
staff table (name (string), phone (string), address (string))
CREATE TABLE `person` (
`p_name` varchar(50) DEFAULT NULL,
`p_number` varchar(50) DEFAULT NULL,
`p_address` varchar(50) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=utf8;2, the required jar package:
maven project in pom.xml <dependencies> have added this:
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.0.8</version>
</dependency>Simple java program, addition of jar package, and import projects dependent
mysql-connector-java5.0.8
3, the new java project:
3.1 DBManager.java
Create a jdbc Tools
package com.lemon.test;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
public class DBManager {
//数据库信息
private static final String url = "jdbc:mysql://localhost:3306/tbtest";
private static final String name = "com.mysql.jdbc.Driver";
private static final String username = "root";
private static final String password = "123456";
private static Connection connection = null;
private static PreparedStatement preparedStatement = null;
//创建连接
public DBManager(){
try{
Class.forName(name);
connection = DriverManager.getConnection(url, username, password);
}catch(Exception e){
e.printStackTrace();
}
}
//关闭连接
private void close(){
try{
connection.close();
preparedStatement.close();
}catch (Exception e){
e.printStackTrace();
}
}
//查询
public void queryAll() throws SQLException{
String sql = "select * from person";
preparedStatement = connection.prepareStatement(sql);
String name,number,address;
try
{
//执行sql语句
ResultSet result = preparedStatement.executeQuery();
//查询到数据，对应赋值
while(result.next()){
name = result.getString(1);
number = result.getString(2);
address = result.getString(3);
//显示
System.out.println(name + ",\t" + number + ",\t" + address + ".\t");
}
result.close();
}catch (Exception e){
e.printStackTrace();
}
}
//增加
public void addPerson(String name ,String number ,String address) throws SQLException{
String sql = "insert into person (p_name,p_number,p_address) values (?,?,?)";
preparedStatement = connection.prepareStatement(sql);
preparedStatement.setString(1, name);
preparedStatement.setString(2, number);
preparedStatement.setString(3, address);
int row = preparedStatement.executeUpdate();
if(row > 0){
System.out.println("添加成功!");
}
preparedStatement.close();
}
//删除
public void delPersonByName(String name) throws SQLException{
String sql = "delete from person where p_name = ?";
//
preparedStatement = connection.prepareStatement(sql);
//完整sql语句
preparedStatement.setString(1, name);
int row = preparedStatement.executeUpdate();
if(row > 0){
System.out.println("删除成功!");
}else{
System.out.println("请正确输入需要删除的姓名！");
}
preparedStatement.close();
}
//更新
public void updatePerson(String name ,String number ,String address) throws SQLException{
String sql = "update person set";
if(number != null){
sql = sql + " p_number = ?";
}
if(number != null && address != null){
sql = sql + ",";
}
if(address != null){
sql = sql + "p_address = ?";
}
sql = sql + "where p_name = ?";
//
preparedStatement = connection.prepareStatement(sql);
int i = 1;
//完整sql语句
if(number != null){
preparedStatement.setString(i, number);
i++;
}
if(address != null){
preparedStatement.setString(i, address);
i++;
}
preparedStatement.setString(i, name);
int row = preparedStatement.executeUpdate();
if(row > 0){
System.out.println("更新成功!");
}else{
System.out.println("请正确输入需要更新的姓名！");
}
preparedStatement.close();
}
}
2、main.java
Simple java applet
import com.lemon.test.DBManager;
import java.sql.SQLException;
import java.util.Scanner;
public class main {
private static DBManager dbManager = new DBManager();//实例化数据库连接
public static void main(String[] args) throws SQLException {
boolean flag = true; //程序结束标志
boolean flagNum = true; //操作数正确输入标志
int num = 0; //操作数
Scanner input =new Scanner(System.in);
while( flag) {
//输出所有用户信息
printInfo();
//初始化flagNum，重新输入操作数
flagNum = true;
//输入正确操作数
while (flagNum){
System.out.println("请输入操作数[0-3]:");
try {
//输入操作数字
num = input.nextInt();
if( num < 0 || num >3){
int x = 1/0;
}
flagNum = false; //是数字，结束
}catch (Exception e){
System.out.println("输入有误,请重新输入！");
input.nextLine();
}
}
//执行操作数对应的操作
switch (num){
//退出系统
case 0:
flag = false;
System.out.println("****欢迎下次使用****");
break;
//添加
case 1:
System.out.println("****添加用户信息****");
addPerson();
break;
//删除
case 2:
System.out.println("****删除用户信息****");
delPerson();
break;
//修改
case 3:
System.out.println("****修改用户信息****");
updatePerson();
break;
}
}
}
//输出操作提示信息
public static void printInfo() throws SQLException {
System.out.println("***********人员管理系统！***********");
//输出person所有信息
System.out.println("姓名" + ",\t" + "电话" + ",\t\t" + "地址");
dbManager.queryAll();
System.out.println("************************************");
System.out.println("1：添加新用户信息、" + "2：删除用户信息、" + "3：修改用户信息、" + "0：退出");
}
//添加用户信息
public static void addPerson() throws SQLException {
Scanner input =new Scanner(System.in);
System.out.println("请输入姓名：");
String name = input.nextLine();
System.out.println("请输入电话：");
String number = input.nextLine();
System.out.println("请输入地址：");
String address = input.nextLine();
dbManager.addPerson(name,number,address);
}
//删除用户信息
public static void delPerson() throws SQLException {
Scanner input =new Scanner(System.in);
System.out.println("请输入需要删除的用户姓名：");
String name = input.nextLine();
dbManager.delPersonByName(name);
}
//修改用户信息
public static void updatePerson() throws SQLException {
Scanner input =new Scanner(System.in);
System.out.println("***请输入需要修改的用户信息***");
System.out.println("请输入姓名：");
String name = input.nextLine();
System.out.println("请输入电话：");
String number = input.nextLine();
System.out.println("请输入地址：");
String address = input.nextLine();
dbManager.updatePerson(name,number,address);
}
}
3, run directly mian.java, experience the next
Like it or not do not spray, novice, open to suggestions
