Merge pull request beberlei#54 from matjaz/master

limited support for GROUP_CONCAT

lib/DoctrineExtensions/Query/Mysql/GroupConcat.php

@@ -0,0 +1,52 @@
+<?php
+
+/**
+ * DoctrineExtensions Mysql Function Pack
+ *
+ * LICENSE
+ *
+ * This source file is subject to the new BSD license that is bundled
+ * with this package in the file LICENSE.txt.
+ * If you did not receive a copy of the license and are unable to
+ * obtain it through the world-wide-web, please send an email
+ * to [email protected] so I can send you a copy immediately.
+ */
+
+namespace DoctrineExtensions\Query\Mysql;
+
+use Doctrine\ORM\Query\AST\Functions\FunctionNode,
+    Doctrine\ORM\Query\Lexer;
+
+// limited support for GROUP_CONCAT
+class GroupConcat extends FunctionNode
+{
+    public $isDistinct = false;
+    public $expression = null;
+
+    public function getSql(\Doctrine\ORM\Query\SqlWalker $sqlWalker)
+    {
+        return 'GROUP_CONCAT(' .
+            ($this->isDistinct ? 'DISTINCT ' : '') .
+            $this->expression->dispatch($sqlWalker) .
+        ')';
+    }
+
+    public function parse(\Doctrine\ORM\Query\Parser $parser)
+    {
+
+        $parser->match(Lexer::T_IDENTIFIER);
+        $parser->match(Lexer::T_OPEN_PARENTHESIS);
+
+        $lexer = $parser->getLexer();
+        if ($lexer->isNextToken(Lexer::T_DISTINCT)) {
+            $parser->match(Lexer::T_DISTINCT);
+
+            $this->isDistinct = true;
+        }
+
+        $this->expression = $parser->SingleValuedPathExpression();
+
+        $parser->match(Lexer::T_CLOSE_PARENTHESIS);
+    }
+
+}