JDBC 测试连接数据库

JDBC 测试连接数据库

package com.xiang.lesson01;

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

public class DBTest {
    /*
    **建立连接的五大步骤：**

1. 加载（注册）数据库

2. 建立链接

3. 语句对象来执行SQL语句

4. 处理结果集 、返回结果

5. 关闭数据库、释放资源
     */
//    private static  String URL = "jdbc:mysql://localhost:3307/webapp1?serverTimezone=utf8mb4";
//    useSSL=false 安全连接；
    private static  String URL = "jdbc:mysql://localhost:3307/webapp1?serverTimezone=UTC&useUnicode=true&characterEncoding=utf-8&useSSL=false" ;
    private  static  String DriverClass ="com.mysql.cj.jdbc.Driver";
    private  static  String  UserName ="webapp1";
    private  static  String  PassWord ="webapp1";
    private  static  Connection connection=null;

    public static   Connection getConnection(){
        try {
            Class.forName(DriverClass);
            connection = DriverManager.getConnection(URL,UserName,PassWord);
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        } catch (SQLException throwables) {
            throwables.printStackTrace();
        }
        return  connection;
    }

//    public  void  closeRerource(Connection connection){
//        try {
//            connection.close();
//        } catch (SQLException throwables) {
//            throwables.printStackTrace();
//        }
//    }

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

    public static void main(String[] args) {
        connection = DBTest.getConnection();
        if (connection != null){
            System.out.println("连接成功");
        }else {
            System.out.println("连接失败");
        }
        closeRerource();
    }

}

导入mysql jar包