mysql数据库utils工具类，mybatis底层的实现

1. 加载驱动告诉Java连接的是那个数据库
   calss.forName(驱动程序的全限定类名)
   驱动类，引入jar包
   com.mysql.jdbc.Driver
   oracle.jdbc.driver.OracleDriver
2. 获取连接Connection—造桥
   url
   username
   password
3. 准备sql—准备物资
4. 准备一个小推车Statement
5. 带着物资去执行
6. 小推车返回结果，处理结果
7. 关闭资源close----毁车炸桥

package com.uek.test;

import com.uek.utils.JdbcUtils;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

public class Test {
  public static void main(String[] args) {
      PreparedStatement preparedStatement = null;

      Connection connection=null;
      ResultSet resultSet = null;
      try {
           connection = JdbcUtils.getConnection();
           preparedStatement = JdbcUtils.getStatement(connection, "delete from user where username=? or username=?");
          System.out.println(preparedStatement);
          int i = JdbcUtils.executeDMlOperation(preparedStatement, "aa", "bb");
          System.out.println(i);
         
      } catch (SQLException throwables) {
          throwables.printStackTrace();
      }finally {
          JdbcUtils.closeResources(connection,preparedStatement,resultSet);
      }

  }
}