#include <mysql/mysql.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int main() {
    MYSQL *conn;
    MYSQL_RES *res;
    MYSQL_ROW row;

    conn = mysql_init(NULL);
    if (conn == NULL) {
        fprintf(stderr, "mysql_init() failed\n");
        exit(1);
    }

    if (mysql_real_connect(conn, "localhost", "root", "root", "router", 3306,
                           NULL, 0) == NULL) {
        fprintf(stderr, "mysql_real_connect() failed\n");
        mysql_close(conn);
        exit(1);
    }

    if (mysql_query(conn,
                    "SELECT JSON_OBJECT('username', username, 'password', "
                    "password) FROM users")) {
        fprintf(stderr, "SELECT query failed. Error: %s\n", mysql_error(conn));
        mysql_close(conn);
        exit(1);
    }

    res = mysql_store_result(conn);
    if (res == NULL) {
        fprintf(stderr, "mysql_store_result() failed\n");
        mysql_close(conn);
        exit(1);
    }

    while ((row = mysql_fetch_row(res))) {
        printf("%s\n", row[0]);
    }

    mysql_free_result(res);
    mysql_close(conn);

    return 0;
}