Fix parser API, explicitly disable multi-queries in WP_SQLite_Driver::query()

Author: JanJakes

tests/WP_SQLite_Driver_Tests.php

@@ -4463,4 +4463,10 @@ public function testSessionSqlModes(): void {
 		$result = $this->assertQuery( 'SELECT @@session.SQL_mode' );
 		$this->assertSame( 'ONLY_FULL_GROUP_BY', $result[0]->{'@@session.SQL_mode'} );
 	}
+
+	public function testMultiQueryNotSupported(): void {
+		$this->expectException( WP_SQLite_Driver_Exception::class );
+		$this->expectExceptionMessage( 'Multi-query is not supported.' );
+		$this->assertQuery( 'SELECT 1; SELECT 2' );
+	}
 }

wp-includes/mysql/class-wp-mysql-parser.php

@@ -33,9 +33,6 @@ public function next_query(): bool {
 			return false;
 		}
 		$this->current_ast = $this->parse();
-		if ( ! $this->current_ast ) {
-			return false;
-		}
 		return true;
 	}
 

wp-includes/sqlite-ast/class-wp-sqlite-driver.php

@@ -599,14 +599,17 @@ public function query( string $query, $fetch_mode = PDO::FETCH_OBJ, ...$fetch_mo
 
 		try {
 			// Parse the MySQL query.
-			// TODO: Translate and execute all queries in the SQL input string.
 			$parser = $this->create_parser( $query );
 			$parser->next_query();
 			$ast = $parser->get_query_ast();
 			if ( null === $ast ) {
 				throw $this->new_driver_exception( 'Failed to parse the MySQL query.' );
 			}
 
+			if ( $parser->next_query() ) {
+				throw $this->new_driver_exception( 'Multi-query is not supported.' );
+			}
+
 			// Handle transaction commands.
 
 			/*