add new tables: customer_cart, sale, alter timestamp fields in tables

console/migrations/m151021_055338_add__table__customer_cart.php

@@ -0,0 +1,40 @@
+<?php
+
+use yii\db\Schema;
+use yii\db\Migration;
+
+class m151021_055338_add__table__customer_cart extends Migration
+{
+    public function up()
+    {
+    	$tableOptions = null;
+    	if ($this->db->driverName === 'mysql') {
+    		// http://stackoverflow.com/questions/766809/whats-the-difference-between-utf8-general-ci-and-utf8-unicode-ci
+    		$tableOptions = 'CHARACTER SET utf8 COLLATE utf8_unicode_ci ENGINE=InnoDB';
+    	}
+    	
+    	$this->createTable('{{%shopping_cart}}', [
+    			'id_shopping_cart' => $this->primaryKey(),
+    			'id_customer' =>  $this->integer(11) ,
+    			'id_sale' =>  $this->integer(11) ,
+    	], $tableOptions);
+    }
+
+    public function down()
+    {
+        echo "m151021_055338_add__table__customer_cart cannot be reverted.\n";
+
+        return false;
+    }
+
+    /*
+    // Use safeUp/safeDown to run migration code within a transaction
+    public function safeUp()
+    {
+    }
+
+    public function safeDown()
+    {
+    }
+    */
+}