Storing Files in Database

This class lets you store files in Database. This example works for MySQL. SQL to create the table

CREATE TABLE blobtable (
filename varchar(20) NOT NULL,
data blob NOT NULL,
PRIMARY KEY  (filename)
)

package net.gfour.jdbc;

import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.InputStream;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.SQLException;

/**
* This class handles storage of any file type into the database.
*
* @date Jan 9, 2007
* @author chandan
* @copyright (c) gfour.net
*/
public class BlobHelper {
private String sql = "insert into blobtable values(?,?)";

private Connection con = null;

/**
 * Main method tests the usage of the class.
 */
public static void main(String[] args) throws ClassNotFoundException,
  SQLException {
 Class.forName("com.mysql.jdbc.Driver");
 Connection conn = (Connection) DriverManager.getConnection(
   "jdbc:mysql://localhost:3306/test", "root", "admin");
 BlobHelper bh = new BlobHelper();
 // path of the file to be stored
 bh.insert("D:\\chandan\\My Pictures\\admin.jpg", conn);
}

public boolean insert(String fileName, Connection con) {
 File file = new File(fileName);
 InputStream data = null;
 try {
  data = new FileInputStream(file);
 } catch (FileNotFoundException e1) {
  // TODO Auto-generated catch block
  e1.printStackTrace();
 }
 try {
  PreparedStatement pstmt = con.prepareStatement(sql);
  pstmt.setString(1, file.getName());
  pstmt.setBinaryStream(2, data, (int) file.length());
  pstmt.execute();
  System.out.println("Update Successful");
  return true;
 } catch (SQLException e) {
  // TODO Auto-generated catch block
  e.printStackTrace();
 }
 return false;
}

/**
 * This Constructor is capable of creating the connection to the database
 *
 * @param url
 * @param Driver
 * @param sql
 */
public BlobHelper(String url, String Driver, String sql) {
 this.sql = sql;
 try {
  Class.forName("com.mysql.jdbc.Driver");
  con = DriverManager.getConnection(url);
 } catch (ClassNotFoundException e) {
  // TODO Auto-generated catch block
  e.printStackTrace();
 } catch (SQLException e) {
  // TODO Auto-generated catch block
  e.printStackTrace();
 }
}

public BlobHelper() {
 // Instantiate anything if required.
}

/**
 * Another overloaded insert(). Works best with constructor
 * BlobHelper(String, String, String)
 * @param fileName
 * @return
 */
public boolean insert(String fileName) {
 if (con != null)
  return insert(fileName, con);
 return false;
}
}