-1
我正在使用C++將MySQL命令發送到服務器。爲什麼會說「分段錯誤」,這是什麼意思? 程序的當我運行它的輸出是:什麼是C++ mysql中的分段錯誤?
connection Succeeded
Segmentation fault
編輯代碼以除去第i + 1行,但仍具有相同的問題
的代碼:
#include <stdlib.h>
#include <iostream>
#include <mysql.h>
#include <stdio.h>
#define SERVER "localhost"
#define USER "root"
#define PASSWORD "coursework"
int main()
{
MYSQL *connect;
connect=mysql_init(NULL);
if (!connect)
{
std::cout<<"MySQL Initialization failed";
return 1;
}
connect=mysql_real_connect(connect, SERVER, USER, PASSWORD, NULL ,0,NULL,0);
if (connect)
{
std::cout<<"connection Succeeded\n";
}
else
{
std::cout<<"connection failed\n";
exit(1);
}
mysql_query (connect, "drop database if exists TTU;");
mysql_query (connect,"create database TTU;");
mysql_query (connect, "use TTU;");
mysql_query (connect, "create table students(tnumber char(8) PRIMARY KEY,");
mysql_query (connect, "firstname varchar(20) NOT NULL,");
mysql_query (connect, "lastname varchar(20) NOT NULL,");
mysql_query (connect, "dateofbirth date,");
mysql_query (connect, "INDEX 'lastname_i' ('lastname'),");
mysql_query (connect, "ENGINE=INNODB);");
mysql_query (connect, "insert into students(tnumber, firstname, lastname, dateofbirth)");
mysql_query (connect, "values (000, Joe, Smith, 1950-08-12);");
MYSQL_RES *res_set;
MYSQL_ROW row;
mysql_query (connect,"select * from students;");
unsigned int i =0;
res_set = mysql_store_result(connect);
unsigned int numrows = mysql_num_rows(res_set);
while ((row= mysql_fetch_row(res_set)) != NULL)
{
std::cout << row[i] << std::endl;
}
mysql_close (connect);
std::cout << "TEST" << std::endl;
return 0;
}
這似乎是C++代碼而不是Java。 – CalmBit
分段錯誤是當程序嘗試訪問它無權訪問的內存時發生的錯誤。 沒有發生錯誤的行號(使用調試器獲得),很難確定究竟是什麼導致了錯誤。 – CalmBit
我不是這方面的專家,但你怎麼確定這裏有一個'i + 1'條目:'std :: cout << row [i + 1] << std :: endl;''? – PaulMcKenzie