Foros del web, para los que viven de bits

import java.sql.*;

public class coneccionMySql
{
	static String bd = "myDataBase";
	static String login = "user";
	static String password = "mymegapassword";
	static String url = "jdbc:mysql://localhost/" + bd;
	
	
	public static void main(String[] args)throws Exception
	{
		Connection conn = null;
		try
		{
			//ESTABLECEMOS LA CONECCION
			Class.forName("com.mysql.jdbc.Driver").newInstance();
			conn = DriverManager.getConnection(url,login,password);
			
			if (conn != null)
			{
				System.out.println("Conexión a base de datos " + url + " ... Ok");
				
				//HACEMOS UNA CONSULTA
				Statement stmt = conn.createStatement();
				ResultSet res  = stmt.executeQuery("SELECT * FROM carreras");
				
				while(res.next())
				{
					String Id  = res.getString("Id");
					String Carrera   = res.getString("Carrera");
					String Facultad= res.getString("Facultad");
					
					System.out.println(Id +" \t "+Carrera+" \t "+Facultad);
				}
				
				res.close();
				stmt.close();
				conn.close(); 
			}
		}
		catch(SQLException ex)
		{
			System.out.println("\n\nHubo un error : "+ex);
		}
		catch(ClassNotFoundException ex)
		{
			System.out.println("\n\nHubo otro error!!, no se encontro el driver, revisa tu ClassPath :(\n");
			System.out.println(ex);
		}
		
	}
}

import java.io.*;
import java.util.*;

public class MeterDatos
{

    public static String readLine()
    {
        char nextChar;
        String result = "";
        boolean done = false;

        while (!done)
        {
            nextChar = readChar();
            if (nextChar == '\n')
               done = true;
            else if (nextChar == '\r')
            {
                //Do nothing.
                //Next loop iteration will detect '\n'
            }
            else
               result = result + nextChar;
        }

        return result;
    }

    public static String readLineWord()
    {
        String inputString = null,
               result = null;
        boolean done = false;

        while(!done)
        {
            inputString = readLine();
            StringTokenizer wordSource =
                                new StringTokenizer(inputString);
            if (wordSource.hasMoreTokens())
            {
                result = wordSource.nextToken();
                done = true;
            }
            else
            {
                System.out.println("Your input is not correct. Your input must");
                System.out.println("contain at least one nonwhitespace character.");
                System.out.println("Please, try again. Enter input:");
           }
       }

       return result;
   }


    public static int readLineInt()
    {
        String inputString = null;
        int number = -9999;//To keep the compiler happy.
                              //Designed to look like a garbage value.
        boolean done = false;

        while (! done)
        {
            try
            {
                inputString = readLine();
                inputString = inputString.trim();
                number = (Integer.valueOf(inputString).intValue());
                done = true;
            }
            catch (NumberFormatException e)
            {
                System.out.println(
                                "Your input number is not correct.");
                System.out.println("Your input number must be");
                System.out.println("a whole number written as an");
                System.out.println("ordinary numeral, such as 42");
                System.out.println("Please, try again.");
                System.out.println("Enter a whole number:");
            }
        }

        return number;
    }


    public static long readLineLong()
    {
        String inputString = null;
        long number = -9999;//To keep the compiler happy.
                            //Designed to look like a garbage value.
        boolean done = false;

        while (! done)
        {
            try
            {
                inputString = readLine();
                inputString = inputString.trim();
                number = (Long.valueOf(inputString).longValue());
                done = true;
            }
            catch (NumberFormatException e)
            {
                System.out.println(
                                "Your input number is not correct.");
                System.out.println("Your input number must be");
                System.out.println("a whole number written as an");
                System.out.println("ordinary numeral, such as 42");
                System.out.println("Please, try again.");
                System.out.println("Enter a whole number:");
            }
       }

        return number;
    }


    public static double readLineDouble()
    {
        String inputString = null;
        double number = -9999;//To keep the compiler happy.
                              //Designed to look like a garbage value.
        boolean done = false;

        while (! done)
        {
            try
            {
                inputString = readLine();
                inputString = inputString.trim();
                number = (Double.valueOf(inputString).doubleValue());
                done = true;
            }
            catch (NumberFormatException e)
            {
                System.out.println(
                                "Your input number is not correct.");
                System.out.println("Your input number must be");
                System.out.println("an ordinary number either with");
                System.out.println("or without a decimal point,");
                System.out.println("such as 42 or 9.99");
                System.out.println("Please, try again.");
                System.out.println("Enter a whole number:");
            }
        }

        return number;
    }


    public static float readLineFloat()
    {
        String inputString = null;
        float number = -9999;//To keep the compiler happy.
                              //Designed to look like a garbage value.
        boolean done = false;

        while (! done)
        {
            try
            {
                inputString = readLine();
                inputString = inputString.trim();
                number = (Float.valueOf(inputString).floatValue());
                done = true;
            }
            catch (NumberFormatException e)
            {
                System.out.println(
                                "Your input number is not correct.");
                System.out.println("Your input number must be");
                System.out.println("an ordinary number either with");
                System.out.println("or without a decimal point,");
                System.out.println("such as 42 or 9.99");
                System.out.println("Please, try again.");
                System.out.println("Enter a whole number:");
            }
        }

        return number;
    }

    public static char readLineNonwhiteChar()
    {
        boolean done = false;
        String inputString = null;
        char nonWhite = ' ';//To keep the compiler happy.

        while (! done)
        {
            inputString = readLine();
            inputString = inputString.trim();
            if (inputString.length() == 0)
            {
                System.out.println(
                                "Your input is not correct.");
                System.out.println("Your input must contain at");
                System.out.println(
                              "least one nonwhitespace character.");
                System.out.println("Please, try again.");
                System.out.println("Enter input:");
            }
            else
            {
                nonWhite = (inputString.charAt(0));
                done = true;
            }
        }

        return nonWhite;
    }

    public static boolean readLineBoolean()
    {
        boolean done = false;
        String inputString = null;
        boolean result = false;//To keep the compiler happy.

        while (! done)
        {
            inputString = readLine();
            inputString = inputString.trim();
            if (inputString.equalsIgnoreCase("true")
                   || inputString.equalsIgnoreCase("t"))
            {
                result = true;
                done = true;
            }
            else if (inputString.equalsIgnoreCase("false")
                        || inputString.equalsIgnoreCase("f"))
            {
                result = false;
                done = true;
            }
            else
            {
                System.out.println(
                                "Your input number is not correct.");
                System.out.println("Your input number must be");
                System.out.println("one of the following:");
                System.out.println("the word true,");
                System.out.println("the word false,");
                System.out.println("the letter T,");
                System.out.println("or the letter F.");
                System.out.println("You may use either uppercase");
                System.out.println("or lowercase letters.");
                System.out.println("Please, try again.");
                System.out.println("Enter input:");
            }
         }

        return result;
    }

    public static char readChar()
    {
        int charAsInt = -1; //To keep the compiler happy
        try
        {
            charAsInt = System.in.read();
        }
        catch(IOException e)
        {
            System.out.println(e.getMessage());
            System.out.println("Fatal error. Ending Program.");
            System.exit(0);
        }

        return (char)charAsInt;
    }

    public static char readNonwhiteChar()
    {
      char next;

      next =  readChar();
      while (Character.isWhitespace(next))
          next =  readChar();

      return next;
    }

}