Allow NULL as well for limit, not integer only

Signed-off-by: Joas Schilling <coding@schilljs.com>

lib/private/DB/Connection.php

@@ -189,15 +189,20 @@ class Connection extends \Doctrine\DBAL\Connection {
 	 * Prepares an SQL statement.
 	 *
 	 * @param string $statement The SQL statement to prepare.
-	 * @param int $limit
-	 * @param int $offset
+	 * @param int|null $limit
+	 * @param int|null $offset
 	 *
 	 * @return Statement The prepared statement.
 	 * @throws Exception
 	 */
 	public function prepare($statement, $limit = null, $offset = null): Statement {
-		if ($limit === -1) {
+		if ($limit === -1 || $limit === null) {
 			$limit = null;
+		} else {
+			$limit = (int) $limit;
+		}
+		if ($offset !== null) {
+			$offset = (int) $offset;
 		}
 		if (!is_null($limit)) {
 			$platform = $this->getDatabasePlatform();

lib/private/DB/QueryBuilder/QueryBuilder.php

@@ -450,12 +450,12 @@ class QueryBuilder implements IQueryBuilder {
 	/**
 	 * Sets the position of the first result to retrieve (the "offset").
 	 *
-	 * @param integer $firstResult The first result to return.
+	 * @param int $firstResult The first result to return.
 	 *
 	 * @return $this This QueryBuilder instance.
 	 */
 	public function setFirstResult($firstResult) {
-		$this->queryBuilder->setFirstResult($firstResult);
+		$this->queryBuilder->setFirstResult((int) $firstResult);
 
 		return $this;
 	}
@@ -477,12 +477,16 @@ class QueryBuilder implements IQueryBuilder {
 	 * of the databases will just return an empty result set, Oracle will return
 	 * all entries.
 	 *
-	 * @param integer $maxResults The maximum number of results to retrieve.
+	 * @param int|null $maxResults The maximum number of results to retrieve.
 	 *
 	 * @return $this This QueryBuilder instance.
 	 */
 	public function setMaxResults($maxResults) {
-		$this->queryBuilder->setMaxResults($maxResults);
+		if ($maxResults === null) {
+			$this->queryBuilder->setMaxResults($maxResults);
+		} else {
+			$this->queryBuilder->setMaxResults((int) $maxResults);
+		}
 
 		return $this;
 	}

lib/public/DB/QueryBuilder/IQueryBuilder.php

@@ -280,7 +280,7 @@ interface IQueryBuilder {
 	/**
 	 * Sets the position of the first result to retrieve (the "offset").
 	 *
-	 * @param integer $firstResult The first result to return.
+	 * @param int $firstResult The first result to return.
 	 *
 	 * @return $this This QueryBuilder instance.
 	 * @since 8.2.0
@@ -299,7 +299,7 @@ interface IQueryBuilder {
 	/**
 	 * Sets the maximum number of results to retrieve (the "limit").
 	 *
-	 * @param integer $maxResults The maximum number of results to retrieve.
+	 * @param int|null $maxResults The maximum number of results to retrieve.
 	 *
 	 * @return $this This QueryBuilder instance.
 	 * @since 8.2.0

lib/public/IDBConnection.php

@@ -86,8 +86,8 @@ interface IDBConnection {
 	/**
 	 * Used to abstract the ownCloud database access away
 	 * @param string $sql the sql query with ? placeholder for params
-	 * @param int $limit the maximum number of rows
-	 * @param int $offset from which row we want to start
+	 * @param int|null $limit the maximum number of rows
+	 * @param int|null $offset from which row we want to start
 	 * @return IPreparedStatement The prepared statement.
 	 * @since 6.0.0
 	 * @throws Exception since 21.0.0