add method to check if we're inside a transaction

lib/private/appframework/db/db.php

@@ -153,6 +153,15 @@ class Db implements IDb {
 		$this->connection->beginTransaction();
 	}
 
+	/**
+	 * Check if a transaction is active
+	 *
+	 * @return bool
+	 */
+	public function inTransaction() {
+		return $this->connection->inTransaction();
+	}
+
 	/**
 	 * Commit the database changes done during a transaction that is in progress
 	 */

lib/private/db/connection.php

@@ -291,4 +291,14 @@ class Connection extends \Doctrine\DBAL\Connection implements IDBConnection {
 	protected function replaceTablePrefix($statement) {
 		return str_replace( '*PREFIX*', $this->tablePrefix, $statement );
 	}
+
+	/**
+	 * Check if a transaction is active
+	 *
+	 * @return bool
+	 * @since 8.2.0
+	 */
+	public function inTransaction() {
+		return $this->getTransactionNestingLevel() > 0;
+	}
 }

lib/public/idbconnection.php

@@ -114,6 +114,14 @@ interface IDBConnection {
 	 */
 	public function beginTransaction();
 
+	/**
+	 * Check if a transaction is active
+	 *
+	 * @return bool
+	 * @since 8.2.0
+	 */
+	public function inTransaction();
+
 	/**
 	 * Commit the database changes done during a transaction that is in progress
 	 * @since 6.0.0