Hi, i will do a project that must on networking.

Question

hi everyone. a my friend want to an accounting project.
there will be a database server and database files and there will be many clients. if any client want to process, it will be on server. I will use mysql because of it is free.
how do i devise this system? are these steps true?
- i install mysql server and configure database on server machine.
- i install to every client my java program.
but, i wonder how a client connect server database? i little acknowledge about networking. please help me.. thanks

Answer 1

Hi.. I did a lot of works but i couldnt get any result.
Firstly i install only mysql server on server machine.
Then, install to client, jdk,netbeans,jdbc connector. And to try, i've installed mysql server my client.
So, then i run this code my client to try connecting localhost. It was working.
import java.sql.*;
public class ONE {
     public static void main(String args[])
          try
               Class.forName("com.mysql.jdbc.Driver").newInstance();
               //Connection conTest = DriverManager.getConnection("jdbc:mysql://localhost/ytu");
               Connection conTest = DriverManager.getConnection("jdbc:mysql://localhost/ytu", "root", "0147");
               Statement komut = conTest.createStatement();
               ResultSet rs = komut.executeQuery("SELECT * FROM students");
               while(rs.next())
                    System.out.println("Name =>" + rs.getString("name"));
                    System.out.println("Surname =>" + rs.getString("surname"));
               conTest.close();
          catch(Exception e)
               System.out.println("There is an error!" + e.getMessage());
               e.printStackTrace();
}But, this remote server application has not worked. :
import java.sql.*;
public class TWO {
     public static void main(String args[])
          try
               Class.forName("com.mysql.jdbc.Driver").newInstance();
               Connection conTest = DriverManager.getConnection("jdbc:mysql://192.168.1.164/factory", "root", "0000");
               Statement komut = conTest.createStatement();
               ResultSet rs = komut.executeQuery("SELECT * FROM employees");
               while(rs.next())
                    System.out.println("Name =>" + rs.getString("name"));
                    System.out.println("Surname =>" + rs.getString("surname"));
               conTest.close();
          catch(Exception e)
               System.out.println("There is an error!" + e.getMessage());
               e.printStackTrace();
}and this error displayed.
C:\Documents and Settings\user\Belgelerim\fuat\mysql>java TWO
There is an error!Access denied for user 'root'@'localhost' (using password: YES
java.sql.SQLException: Access denied for user 'root'@'localhost' (using password
: YES)
        at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:946)
        at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:2934)
        at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:870)
        at com.mysql.jdbc.MysqlIO.secureAuth411(MysqlIO.java:3333)
        at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1232)
        at com.mysql.jdbc.Connection.createNewIO(Connection.java:2749)
        at com.mysql.jdbc.Connection.<init>(Connection.java:1553)
        at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java
:285)
        at java.sql.DriverManager.getConnection(Unknown Source)
        at java.sql.DriverManager.getConnection(Unknown Source)
        at TWO.main(TWO.java:10)what can i do? please help me.. thanks