Can we fetch an added image from MySql database by using java?

Question

I have added an image into a MySql database. And I am trying to fetch the image from the database by creating a new file by using java. The problem is that everything goes fine and image file has been created but the image file doesn't contain the image, it has just nothing and the size of the new created image file differs from the original one..... The Sql Code:

CREATE TABLE `pictures` ( `id` int(11) NOT NULL auto_increment, `description` varchar(20) default NULL, `photo` blob, PRIMARY KEY (`id`) );
insert into pictures values('1','pic1','D:\java.jpg');

And the java code:

public class ReadBlobPicture
{
    static String url = "jdbc:mysql://localhost:3306/imgdatabase";
    static String username = "root";
    static String password = "tiger";

    public static void main(String[] args) 
        throws Exception 
    {
        Class.forName("com.mysql.jdbc.Driver");
        Connection conn = DriverManager.getConnection(url, username, password);
        String sql = "SELECT photo FROM pictures where id=1";
        Statement stmt = conn.prepareStatement(sql);
        ResultSet resultSet = stmt.executeQuery(sql);
        Object obj = resultSet;

        while (resultSet.next()) 
        {
            File image = new File("E:\\java12.jpg");
            FileOutputStream fos = new FileOutputStream(image);
            System.out.println(resultSet.getString(1));
            byte[] buffer = new byte[1];
            InputStream is2 = resultSet.getBinaryStream(1);
            System.out.println(is2.available());

            while (is2.read() > 0) 
            {
                fos.write(buffer);
                fos.flush();
            }

            fos.close();
        }

        conn.close();
    }
}

Answer 1

insert into pictures values('1','pic1','D:\java.jpg');

Does not insert binary jpg data into the database, it inserts the string D:\java.jpg

Answer 2

you have a problem writing to your outputstream, it should be like this:

while ((buffer[0] = is2.read()) > 0) 
            {
                fos.write(buffer[0]);
                fos.flush();
            }

And your picture should be saved in the database as a BLOB!

P.S. your buffer is useless since it has a size of 1, you should make it at least 512 or 1024 to void reading byte by byte.

Hope it helped.

Answer 3

You read from the stream, but never save the read character into the buffer...

while (is2.read() > 0) 
{
    fos.write(buffer);
    fos.flush();
}

something like:

int x;

while((x = is2.read()) != -1)
{
   fos.write(x);
}

fos.flush();

(edit - from the comment on another answer...)

For the insert statement not inserting the image see this link

/*

Defining the Table: Oracle and MySql

create table MyPictures (
   id INT PRIMARY KEY,
   name VARCHAR(0),
   photo BLOB
);
*/
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.SQLException;

public class InsertPictureToMySql {
  public static void main(String[] args) throws Exception, IOException, SQLException {
    Class.forName("org.gjt.mm.mysql.Driver");
    Connection conn = DriverManager.getConnection("jdbc:mysql://localhost/databaseName", "root", "root");
    String INSERT_PICTURE = "insert into MyPictures(id, name, photo) values (?, ?, ?)";

    FileInputStream fis = null;
    PreparedStatement ps = null;
    try {
      conn.setAutoCommit(false);
      File file = new File("myPhoto.png");
      fis = new FileInputStream(file);
      ps = conn.prepareStatement(INSERT_PICTURE);
      ps.setString(1, "001");
      ps.setString(2, "name");
      ps.setBinaryStream(3, fis, (int) file.length());
      ps.executeUpdate();
      conn.commit();
    } finally {
      ps.close();
      fis.close();
    }
  }
}

Answer 4

hi i want insert multiple files in Blob field using Java program can any one help