java实训第一天

学生管理系统需要实现的功能

建立数据库，在数据中建表，输入数据

创建四个实体类

创建数据库连接
package net.hw.student.dbutil;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;

import javax.swing.JOptionPane;

/**

• 包名：net.hw.student.dbutil

• 类名：ConnectionManager

• 描述：数据库连接管理类

• 作者：李筱绮

• 日期：2019年6月17日

*/

public class ConnectionManager {
private static final String DRIVER = “com.mysql.jdbc.Driver”;
private static final String URL = “jdbc:mysql://localhost:3306/student”;
private static final String USERNAME = “root”;
private static final String PASSWORD = “12345”;
private ConnectionManager() {

}
public static Connection getConnection() {
    Connection conn = null;

    try {
        Class.forName(DRIVER);
        conn = DriverManager.getConnection(URL
                + "?useUnicode=true&characterEncoding=UTF8", USERNAME, PASSWORD);
    }catch (ClassNotFoundException e) {
        e.printStackTrace();
    } catch (SQLException e) {
        e.printStackTrace();
    }
    return conn;
}
public static void closeConnection(Connection conn) {
    if (conn != null) {
        try {
            if (!conn.isClosed()) {
                conn.close();
            }
        }catch (SQLException e) {
            e.printStackTrace();
        }
    }
}
public static void main(String[] args) {
    Connection conn = getConnection();
    if (conn != null) {
        JOptionPane.showMessageDialog(null, "恭喜，数据库连接成功！");
    }else {
        JOptionPane.showMessageDialog(null, "遗憾，数据库连接失败！");
    }
    closeConnection(conn);
}

}