1、数据库建表
2、实体类层
package com.edu.entity;
import java.util.Date;
public class User {
private int id;
private String username;
private String userused;
private String usermoney;
private Date usedate;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getUsername() {
return username;
}
public void setUsername(String username) {
this.username = username;
}
public String getUserused() {
return userused;
}
public void setUserused(String userused) {
this.userused = userused;
}
public String getUsermoney() {
return usermoney;
}
public void setUsermoney(String usermoney) {
this.usermoney = usermoney;
}
public Date getUsedate() {
return usedate;
}
public void setUsedate(Date usedate) {
this.usedate = usedate;
}
public User(int id, String username, String userused, String usermoney, Date usedate) {
super();
this.id = id;
this.username = username;
this.userused = userused;
this.usermoney = usermoney;
this.usedate = usedate;
}
public User() {
// TODO 自动生成的构造函数存根
}
}
3、数据库连接驱动
package com.edu.entity;
import java.sql.Connection;
import java.sql.DriverManager;
public class DbHelper {
private static String url = "jdbc:mysql://localhost:3306/countuser"; // 数据库地址
private static String userName = "root"; // 数据库用户名
private static String passWord = "*****"; // 数据库密码
private static Connection conn = null;
private DbHelper() {
}
public static Connection getConnection() {
if (null == conn) {
try {
Class.forName("com.mysql.jdbc.Driver");
conn = DriverManager.getConnection(url, userName, passWord);
} catch (Exception e) {
e.printStackTrace();
}
}
return conn;
}
public static void main(String[] args) { // 测试数据库是否连通
System.err.println(getConnection());
}
}