[英]Segmentation fault (core dumped) on simple SQL code
I get a “Segmentation fault (core dumped)” error on some simple C++ code. 我在一些简单的C ++代码上收到“分段错误(内核已转储)”错误。 The error will accure when I use the variable result. 当我使用变量结果时,错误将累积。 What can cause this problem in this case? 在这种情况下什么会导致此问题? I know that something goes out of range, but how is it possible that result does? 我知道有些超出范围,但结果怎么可能呢? There are only 2 items in the database. 数据库中只有2个项目。
#include <iostream>
#include <boost/variant.hpp>
#include <mysql/mysql.h>
#include <mysql_connection.h>
using namespace std;
const char *server = "localhost";
const char *user = "XXXX";
const char *password = "XXXX";
const char *database = "XXXX";
int main()
{
MYSQL *conn;
MYSQL_RES *result;
MYSQL_ROW row;
int num_fields = 0;
conn = mysql_init(NULL);
mysql_real_connect(conn, server,user, password, database, 0, NULL, 0);
mysql_query(conn, "SELECT * FROM `users` WHERE `id` = '5'");
result = mysql_store_result(conn);
num_fields = mysql_num_fields(result);
while ((row = mysql_fetch_row(result)))
{
cout << "Spam ";
}
mysql_free_result(result);
mysql_close(conn);
}
The error: 错误:
Segmentation fault (core dumped)
Process returned 139 (0x8B) execution time : 0.255 s
Press ENTER to continue.
解决方案是建立一个符号链接,以便mysql可以找到mysql.sock:
sudo ln -s /var/run/mysqld/mysqld.sock /tmp/mysql.sock
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