add.relation example added

examples/add.relation/database-mysql_v5.x.sql

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+CREATE TABLE student (
+	id_student INT(11) KEY AUTO_INCREMENT,
+	identification_number VARCHAR(11) NOT NULL,
+	name varchar(50) NOT NULL,
+	age INT(2) NULL,
+	preferences TEXT
+);
+
+CREATE TABLE teacher (
+	id_teacher INT(11) KEY AUTO_INCREMENT,
+	professorship_number VARCHAR(11) NOT NULL,
+	name varchar(50) NOT NULL,
+	experience_time INT(2) NULL,
+	marital_status TINYINT(1),
+	last_university_payment_date DATE
+);
+
+CREATE TABLE relation_student_teacher (
+	id_relation_student_teacher INT(11) KEY AUTO_INCREMENT,
+	id_student INT(11),
+	id_teacher INT(11)
+)

examples/add.relation/student.php

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+<?php
+	class student extends ODBObject{
+		public $identification_number;
+		public $name;
+		public $age;
+		public $preferences;
+	}
+?>

examples/add.relation/teacher.php

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+<?php
+	// constants for marital status
+	define("SINGLE", 	0x01, true);
+	define("MARRIED", 	0x02, true);
+	define("DIVORCED",	0x03, true);
+	define("WIDOWED", 	0x04, true);
+
+	class teacher extends ODBObject{
+		public $professorship_number;
+		public $name;
+		public $experience_time;
+		public $marital_status; // constants
+		public $contract_date;  // date
+	}
+?>

examples/add.relation/test.php

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+<?php
+	require_once "../objectDB/objectDB-mysql-v3.0.php"; // this will include first
+	require_once "student.php";
+	require_once "teacher.php";
+
+	// create, set values and save a new student
+	$student = new student();
+	$student->setDataFromParamsList(3025,'Salvi Pascual',24,'color=orange,grossery=pie,serie=futurama');
+	$student->save();
+
+	// create, set values and save a new teacher
+	$teacher = new teacher();
+	$teacher->setDataFromParamsList('math201','Stephen W. Hawking',37,MARRIED,date("Y-m-d"));
+	$teacher->save();
+
+	// create relation between
+	$student->addRelation($teacher); // same than: $teacher->addRelation($student);
+?>