Proper fix for

Bug #53503      mysqli::query returns false after successful LOAD DATA query
which fixes als #56349, same behavior but in ext/mysql. Both due to a bug
in mysqlnd. Never was a problem with libmysql.
Also fixed the 53503's test case as it always reported PASS, even when there
should have been a failure.

NEWS

@@ -45,7 +45,7 @@
 
 - MySQL Improved extension:
   . Fixed bug #53503 (mysqli::query returns false after successful LOAD DATA 
-    query). (Kalle)
+    query). (Kalle, Andrey)
   . Fixed bug #53425 (mysqli_real_connect() ignores client flags when built to 
     call libmysql). (Kalle, tre-php-net at crushedhat dot com)
   . Fixed buggy counting of affected rows when using the text protocol. The

ext/mysql/tests/bug53649.phpt

@@ -0,0 +1,53 @@
+--TEST--
+Bug #53649 (mysql_query with "load data" unable to save result set)
+--SKIPIF--
+<?php
+require_once('skipif.inc');
+require_once('skipifconnectfailure.inc');
+?>
+--FILE--
+<?php
+	require_once("connect.inc");
+
+	if (!$link = my_mysql_connect($host, $user, $passwd, $db, $port, $socket)) {
+		printf("[001] Connect failed, [%d] %s\n", mysqli_connect_errno(), mysqli_connect_error());
+	}
+
+	if (!mysql_query("DROP TABLE IF EXISTS tlocaldata", $link)) {
+		printf("[002] [%d] %s\n", $link->errno, $link->error);
+	}
+
+	if (!mysql_query("CREATE TABLE tlocaldata (dump1 INT UNSIGNED NOT NULL PRIMARY KEY) ENGINE=" . $engine, $link)) {
+		printf("[003] [%d] %s\n", $link->errno, $link->error);
+	}
+
+	file_put_contents('bug53649.data', "1\n2\n3\n");
+
+	mysql_query("SELECT 1 FROM DUAL", $link);
+
+	if (!mysql_query("LOAD DATA LOCAL INFILE 'bug53649.data' INTO TABLE tlocaldata", $link)) {
+		echo "bug";
+	} else {
+		echo "done";
+	}
+	mysql_close($link);
+?>
+--CLEAN--
+<?php
+require_once('connect.inc');
+
+if (!$link = my_mysql_connect($host, $user, $passwd, $db, $port, $socket)) {
+	printf("[clean] Cannot connect to the server using host=%s, user=%s, passwd=***, dbname=%s, port=%s, socket=%s\n",
+		$host, $user, $db, $port, $socket);
+}
+
+if (!mysql_query($link, 'DROP TABLE IF EXISTS tlocaldata', $link)) {
+	printf("[clean] Failed to drop old test table: [%d] %s\n", mysqli_errno($link), mysqli_error($link));
+}
+
+mysql_close($link);
+
+unlink('bug53649.data');
+?>
+--EXPECT--
+done

ext/mysqli/mysqli_nonapi.c

@@ -541,7 +541,7 @@ PHP_FUNCTION(mysqli_query)
 			result = mysql_use_result(mysql->mysql);
 			break;
 	}
-	if (!result && mysql_errno(mysql->mysql)) {
+	if (!result) {
 		php_mysqli_throw_sql_exception((char *)mysql_sqlstate(mysql->mysql), mysql_errno(mysql->mysql) TSRMLS_CC,
 										"%s", mysql_error(mysql->mysql));
 		RETURN_FALSE;

ext/mysqli/tests/bug53503.phpt

@@ -21,13 +21,16 @@ require_once('skipifconnectfailure.inc');
 		printf("[003] [%d] %s\n", $link->errno, $link->error);
 	}
 
-	file_put_contents('bug53503.data', 'jokijoki');
+	file_put_contents('bug53503.data', "1\n2\n3\n");
 
-	if (!$link->query("LOAD DATA LOCAL INFILE 'bug53503.data' REPLACE INTO TABLE tlocaldata (dump1)")) {
+	$link->query("SELECT 1 FROM DUAL");
+
+	if (!$link->query("LOAD DATA LOCAL INFILE 'bug53503.data' INTO TABLE tlocaldata")) {
 		echo "bug";
 	} else {
 		echo "done";
 	}
+	$link->close();
 ?>
 --CLEAN--
 <?php
@@ -38,11 +41,11 @@ if (!$link = my_mysqli_connect($host, $user, $passwd, $db, $port, $socket)) {
 		$host, $user, $db, $port, $socket);
 }
 
-if (!mysqli_query($link, 'DROP TABLE IF EXISTS tlocaldata')) {
+if (!$link->query($link, 'DROP TABLE IF EXISTS tlocaldata')) {
 	printf("[clean] Failed to drop old test table: [%d] %s\n", mysqli_errno($link), mysqli_error($link));
 }
 
-mysqli_close($link);
+$link->close();
 
 unlink('bug53503.data');
 ?>

ext/mysqlnd/mysqlnd_result.c

@@ -431,6 +431,7 @@ mysqlnd_query_read_result_set_header(MYSQLND *conn, MYSQLND_STMT * s TSRMLS_DC)
 				zend_bool is_warning;
 				DBG_INF("LOAD DATA");
 				conn->last_query_type = QUERY_LOAD_LOCAL;
+				conn->field_count = 0; /* overwrite previous value, or the last value could be used and lead to bug#53503 */
 				CONN_SET_STATE(conn, CONN_SENDING_LOAD_DATA);
 				ret = mysqlnd_handle_local_infile(conn, rset_header->info_or_local_file, &is_warning TSRMLS_CC);
 				CONN_SET_STATE(conn,  (ret == PASS || is_warning == TRUE)? CONN_READY:CONN_QUIT_SENT);