Add support for limit in update and delete queries for MySQL driver

src/Database/Drivers/MySqlDriver.php

@@ -254,7 +254,8 @@ public function isSupported($item)
 		// - http://bugs.mysql.com/bug.php?id=31188
 		// - http://bugs.mysql.com/bug.php?id=35819
 		// and more.
-		return $item === self::SUPPORT_SELECT_UNGROUPED_COLUMNS || $item === self::SUPPORT_MULTI_COLUMN_AS_OR_COND;
+		return $item === self::SUPPORT_SELECT_UNGROUPED_COLUMNS || $item === self::SUPPORT_MULTI_COLUMN_AS_OR_COND
+			|| $item === self::SUPPORT_UPDATE_LIMIT || $item === self::SUPPORT_DELETE_LIMIT;
 	}
 
 }

src/Database/ISupplementalDriver.php

@@ -17,6 +17,8 @@ interface ISupplementalDriver
 		SUPPORT_SELECT_UNGROUPED_COLUMNS = 'ungrouped_cols',
 		SUPPORT_MULTI_INSERT_AS_SELECT = 'insert_as_select',
 		SUPPORT_MULTI_COLUMN_AS_OR_COND = 'multi_column_as_or',
+		SUPPORT_UPDATE_LIMIT = 'update_limit',
+		SUPPORT_DELETE_LIMIT = 'delete_limit',
 		SUPPORT_SUBSELECT = 'subselect',
 		SUPPORT_SCHEMA = 'schema';
 

src/Database/Table/SqlBuilder.php

@@ -120,19 +120,33 @@ public function buildInsertQuery()
 
 	public function buildUpdateQuery()
 	{
+		$query = "UPDATE {$this->delimitedTable} SET ?set" . $this->tryDelimite($this->buildConditions());
 		if ($this->limit !== NULL || $this->offset) {
-			throw new Nette\NotSupportedException('LIMIT clause is not supported in UPDATE query.');
+			if($this->driver->isSupported(ISupplementalDriver::SUPPORT_UPDATE_LIMIT)) {
+				$this->driver->applyLimit($query, $this->limit, $this->offset);
+			}
+			else {
+				throw new Nette\NotSupportedException('LIMIT clause is not supported in UPDATE query.');
+			}
 		}
-		return "UPDATE {$this->delimitedTable} SET ?set" . $this->tryDelimite($this->buildConditions());
+
+		return $query;
 	}
 
 
 	public function buildDeleteQuery()
 	{
+		$query = "DELETE FROM {$this->delimitedTable}" . $this->tryDelimite($this->buildConditions());
 		if ($this->limit !== NULL || $this->offset) {
-			throw new Nette\NotSupportedException('LIMIT clause is not supported in DELETE query.');
+			if($this->driver->isSupported(ISupplementalDriver::SUPPORT_DELETE_LIMIT)) {
+				$this->driver->applyLimit($query, $this->limit, $this->offset);
+			}
+			else {
+				throw new Nette\NotSupportedException('LIMIT clause is not supported in DELETE query.');
+			}
 		}
-		return "DELETE FROM {$this->delimitedTable}" . $this->tryDelimite($this->buildConditions());
+
+		return $query;
 	}