Sun - Oracle

A few days ago, Oracle, a company which is known by it’s RDBMS, Oracle Database, bought Sun Microsystems ($7.4 billion.. wheewwww), a company which is known by it’s famous programming language, Java. As we know, Sun had bought MySQL, the famous open source database. Hmm… can you imagine how big Oracle now?

I just wonder what will happen tomorrow. Oracle has the enterprice market, meanwhile MySQL has SOHO market. Now Oracle has them all. I think Microsoft will be jealous. Microsoft SQL Server will not rule the Database World. Absolutely.

There are so many opinions about the future after Oracle bought Sun. May be Oracle will stop MySQL development, or still developing but not provide it as open source anymore. Or it will be better, MySQL will have Oracle features. What about Java? Do we have to pay to use Java like Microsoft does? Some people think it will be disaster. But I hope that Oracle won’t let open source community down.

Related posts:

1. Java & MySQL Connection
2. Creating Database in MySQL
3. How To Install Java in Linux Ubuntu

1) You need to update Ubuntu Repository. Type this command:

sudo apt-get update

Just wait till your Ubuntu Repository updated.

2) Now it’s time to install Java. If you are developer, you need JDK (Java Development Kit), but if not, you only need JRE (Java Runtime Environment). I will install JDK 6 in my Ubuntu.

for JDK, here is the command:

sudo apt-get install sun-java6-jdk sun-java6-plugin

for JRE, here is the command:

sudo apt-get install sun-java6-jre sun-java6-plugin

3) After that, run command:

sudo update-java-alternatives -s java-6-sun

Then add the line “/usr/lib/jvm/java-6-sun” to the top of /etc/jvm file.

4) Check your Java installation using these commands:

java -version

the output:

java version "1.6.0_03"
Java(TM) SE Runtime Environment (build 1.6.0_03-b05)
Java HotSpot(TM) Client VM (build 1.6.0_03-b05, mixed mode, sharing)

if you install JDK, check Java compiler using:

javac -version

the output:

javac 1.6.0_03

5) You’re done!

Related posts:

1. Java & MySQL Connection
2. How to Create Environment Variables in Linux

[ Download MySQL Connector ]

Extract downloaded file (file type: *.jar). Copy that file to directory [jre installation]/lib/ext/. Ok, your Java application is ready to connect with MySQL.

Testing
Code below is used to connect between Java and MySQL.
/*
* DBConnection.java
*
* Created on 29 September 2007, 11:41
*
*/

import java.sql.*;

/**
*
* @author Dani Gunawan
*/
public class DBConnection {

/** Creates a new instance of DBConnection */
public DBConnection() {
}

public Connection connect() {
Connection conn = null;

try
{
String userName = “root”;
String password = “”;
String url = “jdbc:mysql://blog.danigunawan.com/test”;
Class.forName (“com.mysql.jdbc.Driver”).newInstance ();
conn = DriverManager.getConnection (url, userName, password);
} catch (Exception e) {
e.printStackTrace();
conn = null;
} finally {
if (conn != null)
{
try
{
conn.close ();
}
catch (Exception ex) {
ex.printStackTrace();
}
}
}

return conn;
}
}

Code below is used to test the database connection.

/**
* TesConnection.java
*/
import java.sql.*;

public class TesConnection {

public static void main(String args[]) {

Connection dbcon = new DBConnection().connect();

if (dbcon != null) {
System.out.println(“Database connection is successfully created”);
} else {
System.out.println(“Database connection isn’t successfully created”);
}
}

}

How to Use Them?
Put those two source in the same directory. Compile DBConnection.java and TesConnection.java respectively.

javac DBConnection.java
javac TesConnection.java

If you want to compile all of them, use wildcard asterisk (*).

javac *.java

Run TesConnection:

java TesConnection

If the result:

Database connection is successfully created

Then your database is has been connected. But if:

Database connection isn’t successfully created

means your Java application isn’t connected yet with the database.
Possibility:
- MySQL isn’t installed yet
- Database hasn’t been created yet (or maybe wrong database name)
- Wrong database user or password

Both source can be downloaded from link below:

[ Download example file ]

P.S.:
Code had been tested in Windows XP SP 2 Operating System, never been done in other operating systems.

Related posts:

1. How To Install Java in Linux Ubuntu
2. Creating Database in MySQL
3. After Oracle Bought Sun