From ac9acc8e9d02cb5268e55cabb8f45d45954ef2cd Mon Sep 17 00:00:00 2001
From: BrightHewei <61347887+hewei-nju@users.noreply.github.com>
Date: Fri, 18 Mar 2022 09:37:48 +0800
Subject: [PATCH] [fix](sample)(cpp) fix the condition of breaking for loop in
 function (#8497)

---
 samples/connect/cpp/doris_client.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/samples/connect/cpp/doris_client.cpp b/samples/connect/cpp/doris_client.cpp
index 677b565693..235c4f835c 100644
--- a/samples/connect/cpp/doris_client.cpp
+++ b/samples/connect/cpp/doris_client.cpp
@@ -74,7 +74,7 @@ bool DorisClient::exec(const string& sql) {
         std::cout << "Query result:" << std::endl;
         for (int i = 0; i < num_rows; i++) {
             _row = mysql_fetch_row(_result);
-            if (_row < 0) {
+            if (_row == nullptr) {
                 break;
             }
             for (int j = 0; j < num_fields; j++) {