added support for complex joins on query builder.

laravel/database/query/join.php

@@ -0,0 +1,68 @@
+<?php namespace Laravel\Database\Query;
+
+class Join {
+
+	/**
+	 * The type of join being performed.
+	 *
+	 * @var string
+	 */
+	public $type;
+
+	/**
+	 * The table the join clause is joining to.
+	 *
+	 * @var string
+	 */
+	public $table;
+
+	/**
+	 * The ON clauses for the join.
+	 *
+	 * @var array
+	 */
+	public $clauses = array();
+
+	/**
+	 * Create a new query join instance.
+	 *
+	 * @param  string  $type
+	 * @param  string  $table
+	 * @return void
+	 */
+	public function __construct($type, $table)
+	{
+		$this->type = $type;
+		$this->table = $table;
+	}
+
+	/**
+	 * Add an ON clause to the join.
+	 *
+	 * @param  string  $column1
+	 * @param  string  $operator
+	 * @param  string  $column2
+	 * @param  string  $connector
+	 * @return Join
+	 */
+	public function on($column1, $operator, $column2, $connector = 'AND')
+	{
+		$this->clauses[] = compact('column1', 'operator', 'column2', 'connector');
+
+		return $this;
+	}
+
+	/**
+	 * Add an OR ON clause to the join.
+	 *
+	 * @param  string  $column1
+	 * @param  string  $operator
+	 * @param  string  $column2
+	 * @return Join
+	 */
+	public function or_on($column1, $operator, $column2)
+	{
+		return $this->on($column1, $operator, $column2, 'OR');
+	}
+
+}