我测试了 mysql_real_query API,我只是循环执行 Sql 语法,例如“UPDATE ** SET **”,出现泄漏内存错误。当我使用“top”检查错误时,我发现系统“已用内存”选项将始终增长,直到系统或进程崩溃。但是'mysqld'和'testsql'进程的%MEM选项没有增加,系统可用内存看起来消失了。我尝试强制终止“testsql”进程,但内存仍在使用且无法释放。为什么?请帮助我。
int ThreadExeSQL(MYSQL* lpSQLConn, char * sql, int iLen)
{
if (mysql_real_query(lpSQLConn, sql, iLen))
{
MYSQL_RES* lpGetSQLRes = mysql_store_result(lpSQLConn);
mysql_free_result(lpGetSQLRes);
return -1;
}
//mysql_errno(lpSQLConn);
//mysql_error(lpSQLConn);
MYSQL_RES* lpGetSQLRes = mysql_store_result(lpSQLConn);
mysql_free_result(lpGetSQLRes); // release sql memory
return 0; // success
}
void* ThreadSQL_HexWrite(void* lpGet)
{
LPThreadParam getParam = (LPThreadParam)lpGet;
MYSQL* lpSQLConn = (MYSQL*)&getParam->lpSQLConn;
int iThreadIdx = getParam->iThreadIdx;
printf("ID:%d\n", iThreadIdx);
mysql_thread_init();
lpSQLConn = mysql_init(NULL);
if (!mysql_real_connect(lpSQLConn, g_host_name, g_user_name, g_password, g_db_name, g_db_port, NULL, 0))
{
ThreadSQLError(lpSQLConn, NULL);
return;
}
else
{
printf("mysql_real_connect OK!\n");
}
for (int i = 0; i < 1000000; i++)
{
char lpCmdStr[8192] = "\0";
sprintf(lpCmdStr, "update %s set %s=0x%d where id=%d\0", "tb_Data", "Info", i, 1);
if (ThreadExeSQL(lpSQLConn, (char*)lpCmdStr, strlen(lpCmdStr)))
{
MySQLError getError = ThreadSQLError(lpSQLConn, NULL);
HandleMySqlError(getError);
continue; //error
}
else
{
printf("ok. ");
}
usleep(1000 * 10);
}
mysql_close(lpSQLConn);
mysql_thread_end();
printf("ThreadSQL_HexWrite OK!\n");
}
MYSQL* g_MySQLConnList[100];
void main()
{
if (mysql_library_init(0, NULL, NULL))
{
printf("could not initialize MySQL client library\n");
exit(1);
}
int thread_num = 1;
//while (true)
{
pthread_t *pTh = new pthread_t[thread_num];
for (int i = 0; i < thread_num; i++)
{
LPThreadParam lpSetParam = new ThreadParam;
lpSetParam->lpSQLConn = (MYSQL*)&g_MySQLConnList[i];
lpSetParam->iThreadIdx = i;
printf("---create thread idx:%d\n", i);
if (0 != pthread_create(&pTh[i], NULL, ThreadSQL_HexWrite, lpSetParam))
{
printf("pthread_create failed\n");
continue;
}
}
for (int i = 0; i < thread_num; i++)
{
pthread_join(pTh[i], NULL);
}
delete[] pTh;
}
mysql_library_end();
printf("All Done!\n");
}
最佳答案
当 ThreadExeSQL() 失败时,您的连接不会关闭。
关于mysql - CentOS6.9(MySql v5.7.22)使用mysql C API mysql_real_query导致内存总是增长,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/56275198/