package com.legacy.order.util;

import java.sql.Connection;
import java.sql.DriverManager;

public class DbUtil {

    private static final String URL = "jdbc:h2:mem:legacydb;DB_CLOSE_DELAY=-1";
    private static final String USER = "sa";
    private static final String PASSWORD = "password123";

    private static DbUtil instance;
    private static Connection conn;

    private DbUtil() {
        System.out.println("DbUtil初始化了");
    }

    public static DbUtil getInstance() {
        if (instance == null) {
            instance = new DbUtil();
        }
        return instance;
    }

    public Connection getConnection() {
        try {
            Class.forName("org.h2.Driver");
            conn = DriverManager.getConnection(URL, USER, PASSWORD);
            System.out.println("创建了新数据库连接");
            return conn;
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }

    public void closeConnection() {
        try {
            if (conn != null && !conn.isClosed()) {
                conn.close();
            }
        } catch (Exception e) {
        }
    }

    public static Connection getConn() {
        return DbUtil.getInstance().getConnection();
    }
}