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application/Espo/ORM/QueryComposer/MysqlQueryComposer.php

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+<?php
+/************************************************************************
+ * This file is part of EspoCRM.
+ *
+ * EspoCRM – Open Source CRM application.
+ * Copyright (C) 2014-2025 EspoCRM, Inc.
+ * Website: https://www.espocrm.com
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <https://www.gnu.org/licenses/>.
+ *
+ * The interactive user interfaces in modified source and object code versions
+ * of this program must display Appropriate Legal Notices, as required under
+ * Section 5 of the GNU Affero General Public License version 3.
+ *
+ * In accordance with Section 7(b) of the GNU Affero General Public License version 3,
+ * these Appropriate Legal Notices must retain the display of the "EspoCRM" word.
+ ************************************************************************/
+
+namespace Espo\ORM\QueryComposer;
+
+use Espo\ORM\Query\LockTable as LockTableQuery;
+
+use LogicException;
+
+class MysqlQueryComposer extends BaseQueryComposer
+{
+    public function composeLockTable(LockTableQuery $query): string
+    {
+        $params = $query->getRaw();
+
+        $entityType = $this->sanitize($params['table']);
+
+        $table = $this->toDb($entityType);
+
+        $mode = $params['mode'];
+
+        if (empty($table)) {
+            throw new LogicException();
+        }
+
+        if (!in_array($mode, [LockTableQuery::MODE_SHARE, LockTableQuery::MODE_EXCLUSIVE])) {
+            throw new LogicException();
+        }
+
+        $sql = "LOCK TABLES " . $this->quoteIdentifier($table) . " ";
+
+        $modeMap = [
+            LockTableQuery::MODE_SHARE => 'READ',
+            LockTableQuery::MODE_EXCLUSIVE => 'WRITE',
+        ];
+
+        $sql .= $modeMap[$mode];
+
+        if (str_contains($table, '_')) {
+            // MySQL has an issue that aliased tables must be locked with alias.
+            $sql .= ", " .
+                $this->quoteIdentifier($table) . " AS " .
+                $this->quoteIdentifier(lcfirst($entityType)) . " " . $modeMap[$mode];
+        }
+
+        return $sql;
+    }
+
+    public function composeUnlockTables(): string
+    {
+        return "UNLOCK TABLES";
+    }
+
+    protected function limit(string $sql, ?int $offset = null, ?int $limit = null): string
+    {
+        if (!is_null($offset) && !is_null($limit)) {
+            $offset = intval($offset);
+            $limit = intval($limit);
+
+            $sql .= " LIMIT $offset, $limit";
+
+            return $sql;
+        }
+
+        if (!is_null($limit)) {
+            $limit = intval($limit);
+
+            $sql .= " LIMIT $limit";
+
+            return $sql;
+        }
+
+        return $sql;
+    }
+}