java mysql 怎样基于java向mysql数据库中存取图片

import java.io.*;
import java.sql.*;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.Scanner;


public class Database {


  //JDBC驱动名
  String JDBC_DRIVER = "com.mysql.jdbc.Driver";

  //数据库URL：这里的tt是数据库名称
  String JDBC_URL = "jdbc:mysql://localhost:3306/daImage?useSSL=false&serverTimezone=UTC";

  //    数据库的用户名与密码
  String USER = "root";
  String PASS = "admin123";

  //通过DriverManager类获得该连接对象才能访问数据库
  Connection connection = null;

  //    通过Connection获得该结果对象用于执行静态的SQL语句
//  Statement statement = null;
  PreparedStatement preparedStatement = null;

  String path;
  FileInputStream fileInputStream;


  
  Database() {


//      注册JDBC驱动
    try {
      Class.forName(JDBC_DRIVER);

//      数据库的连接：通过DriverManager类的getConnection方法，传入三个参数：数据库URL、用户名、用户密码，实例化connection对象
      connection = DriverManager.getConnection(JDBC_URL, USER, PASS);


    } catch (ClassNotFoundException e) {
      e.printStackTrace();
    } catch (SQLException e) {
      e.printStackTrace();
    }


  }



  public void add() {
    //      定义数据库查询语句：查询aa表中的name、sex两列数据
    String sql = "insert into taImage values(?,?,?) ";
//    读取图片，图片放在电脑本地，所以我这里手动复制了路径
    File file = new File("/Users/liuliu/Desktop/vv.jpeg");


    try {
      FileInputStream fi = new FileInputStream(file);
      preparedStatement = connection.prepareStatement(sql);
      preparedStatement.setInt(1, 2);
      preparedStatement.setString(2, "图片一");
      preparedStatement.setBlob(3, fi);

//      执行查询语句
      int f = preparedStatement.executeUpdate();

      if (f > 0) {
        System.out.println("插入成功");
      } else {
        System.out.println("插入失败");
      }

      preparedStatement.close();
      connection.close();

    } catch (SQLException e) {
      e.printStackTrace();
    } catch (FileNotFoundException e) {
      e.printStackTrace();
    }


  }

  public void select() {

    Blob get_image;

    String sql = "select* from taImage";
    try {
//      将读取到的图片存放到指定的路径中
      FileOutputStream fileOutputStream = new FileOutputStream("/Users/liuliu/Desktop/bb.jpg");

      preparedStatement = connection.prepareStatement(sql);

      ResultSet resultSet = preparedStatement.executeQuery();

      while (resultSet.next()) {

        get_image = resultSet.getBlob("photo");
//        将读取到的Blob对象转成字节流
        inputStream = get_image.getBinaryStream();
        int a;
        byte b[] = new byte[1014];
        while ((a = inputStream.read(b)) != -1) {
          fileOutputStream.write(b, 0, a);
        }


      }


    } catch (SQLException e) {
      e.printStackTrace();
    } catch (FileNotFoundException e) {
      e.printStackTrace();
    } catch (IOException e) {
      e.printStackTrace();
    }


  }


}