Changed work with foreign key and new unit tests

phalcon/db/adapter/pdo/mysql.zep

@@ -25,6 +25,8 @@ use Phalcon\Db\Index;
 use Phalcon\Db\Reference;
 use Phalcon\Db\IndexInterface;
 use Phalcon\Db\Adapter\Pdo as PdoAdapter;
+use Phalcon\Application\Exception;
+use Phalcon\Db\ReferenceInterface;
 
 /**
  * Phalcon\Db\Adapter\Pdo\Mysql
@@ -382,4 +384,19 @@ class Mysql extends PdoAdapter
 
 		return referenceObjects;
 	}
+
+	/**
+	 * Adds a foreign key to a table
+	 */
+	public function addForeignKey(string! tableName, string! schemaName, <ReferenceInterface> reference) -> boolean
+	{
+		var foreignKeyCheck;
+
+		let foreignKeyCheck = this->{"prepare"}(this->_dialect->getForeignKeyChecks());
+		if !foreignKeyCheck->execute() {
+			throw new Exception("DATABASE PARAMETER 'FOREIGN_KEY_CHECKS' HAS TO BE 1");
+		}
+
+		return this->{"execute"}(this->_dialect->addForeignKey(tableName, schemaName, reference));
+	}
 }

phalcon/db/dialect/mysql.zep

@@ -348,7 +348,11 @@ class Mysql extends Dialect
 	{
 		var sql, onDelete, onUpdate;
 
-		let sql = "ALTER TABLE " . this->prepareTable(tableName, schemaName) . " ADD FOREIGN KEY `" . reference->getName() . "`(" . this->getColumnList(reference->getColumns()) . ") REFERENCES " . this->prepareTable(reference->getReferencedTable(), reference->getReferencedSchema()) . "(" . this->getColumnList(reference->getReferencedColumns()) . ")";
+		let sql = "ALTER TABLE " . this->prepareTable(tableName, schemaName) . " ADD";
+		if reference->getName() {
+			let sql .= " CONSTRAINT `" . $reference->getName() . "`";
+		}
+		let sql = " FOREIGN KEY (" . this->getColumnList(reference->getColumns()) . ") REFERENCES " . this->prepareTable(reference->getReferencedTable(), reference->getReferencedSchema()) . "(" . this->getColumnList(reference->getReferencedColumns()) . ")";
 
 		let onDelete = reference->getOnDelete();
 		if !empty onDelete {
@@ -719,4 +723,16 @@ class Mysql extends Dialect
 
 		return "";
 	}
+
+	/**
+	 * Generates SQL to check DB parameter FOREIGN_KEY_CHECKS.
+	 */
+	public function getForeignKeyChecks() -> string
+	{
+		var sql;
+
+		let sql = "SELECT @@foreign_key_checks";
+
+		return sql;
+	}
 }

tests/_data/schemas/mysql/phalcon_test.sql

@@ -602,6 +602,27 @@ ALTER TABLE `stock`
 ALTER TABLE `stock`
   MODIFY `id` int(11) NOT NULL AUTO_INCREMENT, AUTO_INCREMENT=4;
 
+--
+-- Table for testing foreign key
+--
+DROP TABLE IF EXISTS `foreign_key_parent`;
+CREATE TABLE `foreign_key_parent` (
+    `id` int(10) unsigned NOT NULL AUTO_INCREMENT,
+    `name` VARCHAR(32) NOT NULL,
+    `refer_int` INT(10) NOT NULL,
+    PRIMARY KEY (`id`),
+    KEY (`refer_int`)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8;
+
+DROP TABLE IF EXISTS `foreign_key_child`;
+CREATE TABLE `foreign_key_child` (
+    `id` INT(10)   UNSIGNED    NOT NULL AUTO_INCREMENT,
+    `name` VARCHAR(32) NOT NULL,
+    `child_int` INT(10) NOT NULL,
+    PRIMARY KEY (`id`),
+    KEY (`child_int`)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8;
+
 /*!40103 SET TIME_ZONE=@OLD_TIME_ZONE */;
 
 /*!40101 SET SQL_MODE=@OLD_SQL_MODE */;

tests/_support/Helper/Dialect/MysqlTrait.php

@@ -443,6 +443,44 @@ protected function getAddForeignKey()
         ];
     }
 
+    protected function addForeignKey($foreignKeyName = '', $onUpdate = '', $onDelete = '')
+    {
+        $sql = 'ALTER TABLE `foreign_key_child` ADD';
+        if ($foreignKeyName) {
+            $sql .= ' CONSTRAINT `' . $foreignKeyName . '`';
+        }
+        $sql .= ' FOREIGN KEY (`child_int`) REFERENCES `foreign_key_parent`(`refer_int`)';
+
+        if ($onDelete) {
+            $sql .= ' ON DELETE ' . $onDelete;
+        }
+        if ($onUpdate) {
+            $sql .= ' ON UPDATE ' . $onUpdate;
+        }
+
+        return $sql;
+    }
+
+    protected function getForeignKey($foreignKeyName)
+    {
+        $sql = "SELECT
+                COUNT(`CONSTRAINT_NAME`)
+            FROM information_schema.REFERENTIAL_CONSTRAINTS
+            WHERE TABLE_NAME = 'foreign_key_child' AND
+                `UPDATE_RULE` = 'CASCADE' AND
+                `DELETE_RULE` = 'RESTRICT' AND
+                `CONSTRAINT_NAME` = '$foreignKeyName'";
+
+        return $sql;
+    }
+
+    protected function dropForeignKey($foreignKeyName)
+    {
+        $sql = "ALTER TABLE `foreign_key_child` DROP FOREIGN KEY $foreignKeyName";
+
+        return $sql;
+    }
+
     protected function getDropForeignKey()
     {
         return [

tests/unit/Db/Adapter/Pdo/MysqlTest.php

@@ -6,6 +6,7 @@
 use Phalcon\Db\Reference;
 use Phalcon\Test\Module\UnitTest;
 use Phalcon\Db\Adapter\Pdo\Mysql;
+use Helper\Dialect\MysqlTrait;
 
 /**
  * \Phalcon\Test\Unit\Db\Adapter\Pdo\MysqlTest
@@ -26,6 +27,8 @@
  */
 class MysqlTest extends UnitTest
 {
+    use MysqlTrait;
+
     /**
      * @var Mysql
      */
@@ -65,6 +68,8 @@ function () {
                     'artists',
                     'childs',
                     'customers',
+                    'foreign_key_child',
+                    'foreign_key_parent',
                     'issue12071_body',
                     'issue12071_head',
                     'issue_11036',
@@ -156,4 +161,76 @@ function ($identifier, $expected) {
             ]
         );
     }
+
+    /**
+     * Tests Mysql::addForeignKey
+     *
+     * @test
+     * @issue  556
+     * @author Sergii Svyrydenko <sergey.v.sviridenko@gmail.com>
+     * @since  2017-07-03
+     */
+    public function shouldAddForeignKey()
+    {
+        $this->specify(
+            "Foreign key hasn't created",
+            function ($sql, $expected) {
+                expect($this->connection->execute($sql))->equals($expected);
+            },
+            [
+                'examples' => [
+                    [$this->addForeignKey('test_name_key', 'CASCADE', 'RESTRICT'), true],
+                    [$this->addForeignKey('', 'CASCADE', 'RESTRICT'), true]
+                ]
+            ]
+        );
+    }
+
+    /**
+     * Tests Mysql::getForeignKey
+     *
+     * @test
+     * @issue  556
+     * @author Sergii Svyrydenko <sergey.v.sviridenko@gmail.com>
+     * @since  2017-07-03
+     */
+    public function shouldCheckAddedForeignKey()
+    {
+        $this->specify(
+            "Foreign key isn't created",
+            function ($sql, $expected) {
+                expect($this->connection->execute($sql, ['MYSQL_ATTR_USE_BUFFERED_QUERY']))->equals($expected);
+            },
+            [
+                'examples' => [
+                    [$this->getForeignKey('test_name_key'), true],
+                    [$this->getForeignKey('foreign_key_child_ibfk_1'), true]
+                ]
+            ]
+        );
+    }
+
+     /**
+      * Tests Mysql::dropAddForeignKey
+      *
+      * @test
+      * @issue  556
+      * @author Sergii Svyrydenko <sergey.v.sviridenko@gmail.com>
+      * @since  2017-07-03
+      */
+    public function shouldDropForeignKey()
+    {
+        $this->specify(
+            "Foreign key can't be created",
+            function ($sql, $expected) {
+                expect($this->connection->execute($sql))->equals($expected);
+            },
+            [
+                'examples' => [
+                    [$this->dropForeignKey('test_name_key'), true],
+                    [$this->dropForeignKey('foreign_key_child_ibfk_1'), true]
+                ]
+            ]
+        );
+    }
 }