使用PreparedStatement在Java中插入blob数据 [英] Inserting blob data in Java using PreparedStatement

问题描述

我使用以下代码在数据库中插入图像。它将存储两个图像，因为我使用了 PreparedStatement 和 Statement 。

I am using the following code to insert an image in a database. It will store two images because I have used PreparedStatement and Statement.

当我运行此代码时，我在数据库中获得了两个图像。但这两个图像是不同的，我不明白为什么。使用 PreparedStatement ，它完全插入。当我使用 Statement 时，我希望拥有相同的图像。为什么它现在不工作，我怎么能让它工作？

When I run this code, I get two images in the database. But the two images are different, and I don't understand why. Using PreparedStatement, it is inserting perfectly. I want to have the same image when I use Statement. Why is it not working now, and how can I make it work?

import java.io.*;
import java.sql.*;
public class Image
{
    public static void main(String args[]) throws Exception
    {
        System.out.println("kshitij");
        Class.forName("com.mysql.jdbc.Driver");
        Connection cn=DriverManager.getConnection("jdbc:mysql://localhost:3306/jsfdb","root","kshitij");
        Statement st=cn.createStatement();
        File f1=new File("c:\\k1.jpg");
        FileInputStream fin=new FileInputStream(f1);
        //DataInputStream dataIs = new DataInputStream(new FileInputStream(f1));
        PreparedStatement pst = cn.prepareStatement("insert into registration(image) values(?)");
        //pst.setInt(1,67);
        pst.setBinaryStream(1,fin,fin.available());
        pst.executeUpdate();
        //int length=(int)f1.length();
        byte [] b1=new byte[(int)f1.length()];
        fin.read(b1);
        fin.close();
        st.executeUpdate("insert into registration(image) values('"+b1+"')");
        System.out.println("Quesry Executed Successfully");
        FileOutputStream fout=new FileOutputStream("d://k1.jpg");
        fout.write(b1);
        fout.close();
    }
}

MySQL

CREATE DATABASE IF NOT EXISTS jsfdb;
USE jsfdb;

-- Definition of table `registration`
DROP TABLE IF EXISTS `registration`;
CREATE TABLE `registration` (
  `id` int(10) unsigned NOT NULL AUTO_INCREMENT,
  `image` blob NOT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=234 DEFAULT CHARSET=latin1;

推荐答案

将setBlob与InputStream一起使用

Use setBlob with InputStream

File file= new File("your_path");
FileInputStream inputStream= new FileInputStream(file);

PreparedStatement statement = connection.prepareStatement("INSERT INTO yourTable (yourBlob) VALUES (?)");
statement.setBlob(1, inputStream);

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