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Landi20

mysql_query in c

8 posts in this topic

i cant put my select work i dont have any error this
this is the code
char Login(MYSQL *conn, MYSQL_RES *res, MYSQL_ROW row,char *user,char *password){conn = mysql_init (NULL);//printf("%s",user);       mysql_real_connect (conn, opt_host_name, opt_user_name, opt_password,    opt_db_name, opt_port_num, opt_socket_name, opt_flags);if(mysql_real_query(conn,"SELECT password From User where username='%s';",*user)){        fprintf(stderr, "%s \n", mysql_error(conn));	printf("ERRO %s",mysql_error(conn));        printf("Press any key to continue. . . \n");//        getch();        exit(1);    }     //printf("%s",user); res=mysql_use_result(conn);while((row = mysql_fetch_row(res))!=NULL){ if(strcmp(row[0],password)==0){printf("%s\n",row[0]);printf("DEU\n");exit(1);}elseprintf("ERRO");printf("%s\n",row[0]);mysql_close (conn);exit(1);}}//Connecção a base de dados char connection_database(MYSQL *conn, MYSQL_RES *res, MYSQL_ROW row){conn = mysql_init (NULL);    mysql_real_connect (conn, opt_host_name, opt_user_name, opt_password,    opt_db_name, opt_port_num, opt_socket_name, opt_flags);    if(mysql_query(conn, "show tables"))    {        fprintf(stderr, "%s \n", mysql_error(conn));        printf("Press any key to continue. . . \n");//        getch();        exit(1);    }        res = mysql_use_result(conn);     printf("Tables in database\n");    while((row = mysql_fetch_row(res)) != NULL)        printf("%s \n", row[0]);    mysql_close (conn);    printf("Press any key to continue . . . \n");}/*menuprincial(){} */int main (int argc, char *argv[]){    MYSQL *conn; /* pointer to connection handler */    MYSQL_RES *res; /* holds the result set */    MYSQL_ROW row;char password[200]="ola";char user[200]="admin";//connection_database(conn,res,row);    Login(conn,res,row,user,password);    return 0;}
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i solve the problem

How did you go about solving it?

Your solution may be useful to someone with similar issues.

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put the query like this and problem solve

char ola[512];
    mysql_real_connect (conn, opt_host_name, opt_user_name, opt_password,
    opt_db_name, opt_port_num, opt_socket_name, opt_flags);
snprintf(ola,sizeof ola,"SELECT password From User where username=('%s');",user);
if(mysql_query(conn,ola)){
        fprintf(stderr, "%s \n", mysql_error(conn));
    printf("ERRO %s",mysql_error(conn));
        printf("Press any key to continue. . . \n");
//        getch();
        exit(1);
    }    
res=mysql_use_result(conn);
Edited by Landi20
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While the query may succeed, your updated code does not appear to address some of the other concerns I've raised. In particular, it is still vulnerable to SQL injection.

 

In fact, it introduces* a new issue, where the combined length of the query until the format specifier and the user's name could cause some of the final characters of the query to not be written to the string, again leading to potential syntax errors and related problems.

 

* Well, at the very least it highlights a pre-existing issue

Edited by rip-off
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We don't really "close" topics here. A topic naturally falls out of the active set as the conversation dies down. However, any member should feel free to weigh on on a topic should they feel the answers so far aren't complete, even if the OP has indicated they have "accepted" an answer.

 

That said, replying to excessively old threads is discouraged. The forum software should automatically archive old discussions after a number of months. This is for a few reasons:

[list]

[*] When a topic is too old, the information that was originally added may be out of date

[*] The original posters may no longer be active

[*] Some new people come across such topics via a web search, it might not be clear to them that the discussion has died off.

[/list]

For these reasons, creating a new thread is usually preferred.

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