Java. MySQL, JPEG Blob

Pardon the length of the thread, but I just want to make sure we follow each other to the end.
So now, am having a MySQL database, with a table thus:
CREATE TABLE upload (
id INT NOT NULL AUTO_INCREMENT,
name VARCHAR(30) NOT NULL,
type VARCHAR(30) NOT NULL,
size INT NOT NULL,
content MEDIUMBLOB NOT NULL,
PRIMARY KEY(id)
);Into this table I upload a jpg picture through the code:
* To change this template, choose Tools | Templates
* and open the template in the editor.
package nmsquery;
* @author Arthur
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.sql.*;
class FileMySQLSaver
    public static void main(String[] args) throws FileNotFoundException, IOException
        File file = new File("C:\\Users\\Arthur\\Desktop\\africa.jpg");
        System.out.println("Saving file " + file.getName() + " of size " + (file.length()/1000) + " KB");
        saveFile(file);
    private static void saveFile(File file)
        try
            Class.forName("com.mysql.jdbc.Driver").newInstance();
            Connection conn = DriverManager.getConnection("jdbc:mysql://10.0.0.118:3306/test?", "arthur", "password");
            String INSERT_PICTURE = "insert into upload(name, type, size, content) values (?, ?, ?, ?)";
            FileInputStream fileInputStream = null;
            PreparedStatement preparedStatement = null;
            try
                conn.setAutoCommit(false);
//      File file = new File("myPhoto.png");
                fileInputStream = new FileInputStream(file);
                preparedStatement = conn.prepareStatement(INSERT_PICTURE);
                preparedStatement.setString(1, file.getName());
                preparedStatement.setString(2, file.getCanonicalPath().substring(file.getCanonicalPath().length() - 3));
                preparedStatement.setInt(3, (int) file.length());
                preparedStatement.setBinaryStream(4, fileInputStream, (int) file.length());
                preparedStatement.executeUpdate();
                conn.commit();
            finally
                preparedStatement.close();
                fileInputStream.close();
        catch (Exception e)
            e.printStackTrace();
}That runs ok.
So now I want to do the reverse - take the picture from MySQL and display it as a web page. So I employ a jsp page (yes I know this aint the right way to go about it, but at least its the fastest)
<%@ page contentType="text/html; charset=iso-8859-1" language="java" import="java.sql.*" errorPage="" %>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
    <title>Blob</title>
    <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
</head>
<body>
    <%
            try
                // Declare some constant values
                final String user = "arthur";
                final String password = "password";
                Class.forName("com.mysql.jdbc.Driver").newInstance();
                Connection connection = DriverManager.getConnection("jdbc:mysql://localhost/test?", user, password);
                Statement statement = connection.createStatement();
                String query = "SELECT * FROM upload";
                ResultSet rs = statement.executeQuery(query);
                // Get the results
                while (rs.next())
                    out.print(rs.getBytes("content"));
                connection.close();
            catch (Exception e)
                out.print(e);
                out.print("Your session has expired");
    %>
</body>
</html>Which, fortunately or not, displays only this:
[B@1ae76 Now am tempted to think that maybe the line in the jsp file
out.print(rs.getBytes("content"));might be the one responsible. Or is it?

BalusC wrote:
A couple of flaws:
1) Images in HTML are to be represented in an <img> tag where the 'src' points to nothing else than the bytes of the image.That I agree
2) The [Object#toString()|http://java.sun.com/javase/6/docs/api/java/lang/Object.html#toString()] of a byte[] doesn't give you the bytes of the image. You need to write the bytes as bytes to the outputstream of the response. Along nothing else.Allow me to ask how to do this
3) Your code is leaking DB resources. Close resultset, statement and connection in the finally block. Otherwise your application will crash sooner or later.Noted, thanks
You may find this example useful: [http://balusc.blogspot.com/2007/04/imageservlet.html].
I notice that the examples show how to read from canonical or absolute file paths. There isn't anything on reading from a blob...

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Sorry, you have submitted an invalid promo code. Please try again. To send more
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about this code:
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the java file that im running is this............(Test.java)
import java.sql.*;
import java.util.*;
import java.net.*;
import java.io.*;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.*;
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i have also tried adding that mysql-java connector jar file to the classpath........
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ankur

hi
i m trying to connect to mysql database through java.
i have mysql-java-connector jars file placed in the
JAVA_HOME\jre\lib\ext directory.That's a terrible place to put them. Only language extensions (e.g., packages that start with javax) belong in there. Put that JAR closer to your application.
>
now when i try to run this file its starts givin me
this error...............
Exception in thread "main"
java.lang.NoClassDefFoundError: TestLook at the exception: it's complaining about Test, NOT the MySQL JDBC driver class.
You obviously don't understand how CLASSPATH works:
http://java.sun.com/j2se/1.4.2/docs/tooldocs/windows/classpath.html
I think you have to add the current directory to the CLASSPATH in order to run your Test:
java -classpath . TestNote the "dot" after -classpath. That tells the class loader to start looking in the current directory. since your Test.java doesn't have a package statement, I'm assuming that Test.class is in the same directory as Test.java.
>
>
>
the java file that im running is
this............(Test.java)
import java.sql.*;
import java.util.*;
import java.net.*;
import java.io.*;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.*;
class Test
public static void main(String args[])
System.out.println("Hello");
System.out.println("Welcome to the world of java");
System.out.println("Lets learn java.");
String url="jdbc:mysql://localhost:3306/database";
Connection con = null;
Statement stmt = null;
ResultSet rs = null;
String query;
try {
try{
Class.forName("com.mysql.jdbc.Driver").newInstance();
catch(Exception e)
System.out.println("driver not found"+e.getMessage());
con = DriverManager.getConnection (url, "", "");
stmt = con.createStatement();
query = "select * from test;";
ResultSet result = stmt.executeQuery(query);
while(result.next())
String callNumResult = result.getString("name");
System.out.println(callNumResult);
catch(Exception e)
System.out.println("SQLException caught: " +
e.getMessage());
finally {
try {
if (con != null) con.close();
catch (SQLException e) {}
i have also tried adding that mysql-java connector jar
file to the classpath........
but all in vain.....the error persists.
plz help me with it.........
ankur

Question about Java MySQL connection

Hi guys, greetings to y'all, me name is Ryan, I'm new 'round here.
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                              con=DriverManager.getConnection("jdbc:odbc:FlightSource","","");
                              stat2=con.prepareStatement("insert into Passenger_Table(vPassenger_Name,vPassenger_gender,iPassenger_Age,vPassenger_Destination,vPass_FlightClass,vPass_FlightType,vDate_of_Issue,vDate_of_Departure,vDate_Expire,vForm_Payment,Card_No,vTotal_Price)values(?,?,?,?,?,?,?,?,?,?,?,?)");
                              stat2.setString(1,textNama.getText());
                              stat2.setString(2,(String.valueOf(entry2)));
                              stat2.setString(3,textUmur.getText());
                              stat2.setString(4,textTujuan.getText());
                              stat2.setString(5,(String)comboKelas.getSelectedItem());
                              stat2.setString(6,(String)comboJenisKeberangkatan.getSelectedItem());
                              stat2.setString(7,(String)comboTglTiket.getSelectedItem()+"/"+texttgltiket1.getText()+"/"+texttgltiket2.getText());
                              stat2.setString(8,(String)comboTglBerangkat.getSelectedItem()+"/"+texttglberangkat1.getText()+"/"+texttglberangkat2.getText());
                              stat2.setString(9,(String)comboTglKadaluwarsa.getSelectedItem()+"/"+texttglkadaluwarsa1.getText()+"/"+texttglkadaluwarsa2.getText());
                              stat2.setString(10,(String)comboPayType.getSelectedItem());
                              stat2.setString(11,textCardNo.getText());
                              //stat2.setFloat(12,Float.parseFloat(textHarga.getText()));
                              stat2.setString(12,textHarga.getText());
                              stat2.executeUpdate();
                              JOptionPane.showMessageDialog(null, "The Data has successfully Booked " );
                         catch(Exception exception)
                              JOptionPane.showMessageDialog(null,"Error encountered while entering data in the database: "+exception);
                         }I just simply change the Class.forName{} line right ?
What About the database name, considering in the code above I used ODBC (the ODBC name is FlightSource), so the database was configured when I create the ODBC, then how about MySQL, should I create ODBC too to configured the database that I wanna use ?

Java. MySQL, JPEG Blob

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