JDBC中工具类DBUtil

package com.ss.util;

import java.sql.*;

public class DBUtil {

    private static final String URL = "jdbc:mysql://127.0.0.1:3306/test2";
    private static final String user = "root";
    private static final String passwd = "root";

    static {
        //1 加载驱动
        try {
            Class.forName("com.mysql.jdbc.Driver");
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }
        System.out.println("123");
    }

    public static Connection getConnect(){
        //2 获取数据库连接
        Connection connection = null;
        try {
            connection = DriverManager.getConnection(URL, user, passwd);
        } catch (SQLException throwables) {
            throwables.printStackTrace();
        }
        return connection;
    }

    public static void close(PreparedStatement preparedStatement, Connection connection){
        DBUtil.close(null,preparedStatement,connection);
    }

    public static void close(ResultSet resultSet, PreparedStatement preparedStatement, Connection connection){ //方法的重载
        if (resultSet != null)
        {
            try {
                resultSet.close();
            } catch (SQLException throwables) {
                throwables.printStackTrace();
            }
        }

        if (preparedStatement != null)
        {
            try {
                preparedStatement.close();
            } catch (SQLException throwables) {
                throwables.printStackTrace();
            }
        }

        if (connection != null)
        {
            try {
                connection.close();
            } catch (SQLException throwables) {
                throwables.printStackTrace();
            }
        }
    }
}