MySQL C API problems
I'm having some difficulty with a program I wrote which uses the MySQL C api. I'm trying to migrate my server from version 4.0 to version 4.1. I have no difficulty connecting to the server using the mysql.exe command line utility, but when I try to connect from my program using the same parameters, it fails to connect with the Error 1045 (Access denied for user). I use the mysqlclient.lib library to link to my windows program. The library I have is a bit old, but I can't seem to figure out which version it is easily. Is the solution as simple as getting the new developers libraries? Specific versions are below. works with : 4.0.16-standard server doesn't work with: 4.1.7-standard server - Andrew -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/[EMAIL PROTECTED]
Re: MySQL C API problems
Password hashing was changed in 4.1 to improve authentication security, but this complicates backward compatibility. See the manual for details: http://dev.mysql.com/doc/mysql/en/old-client.html http://dev.mysql.com/doc/mysql/en/password-hashing.html Your best bet is to link your app against the 4.1 client library. Michael Andrew Prock wrote: I'm having some difficulty with a program I wrote which uses the MySQL C api. I'm trying to migrate my server from version 4.0 to version 4.1. I have no difficulty connecting to the server using the mysql.exe command line utility, but when I try to connect from my program using the same parameters, it fails to connect with the Error 1045 (Access denied for user). I use the mysqlclient.lib library to link to my windows program. The library I have is a bit old, but I can't seem to figure out which version it is easily. Is the solution as simple as getting the new developers libraries? Specific versions are below. works with : 4.0.16-standard server doesn't work with: 4.1.7-standard server - Andrew -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/[EMAIL PROTECTED]
Re: MySQL C API problems
On Fri, 25 Mar 2005, Michael Stassen wrote:
Password hashing was changed in 4.1 to improve authentication security, but
this complicates backward compatibility. See the manual for details:
http://dev.mysql.com/doc/mysql/en/old-client.html
http://dev.mysql.com/doc/mysql/en/password-hashing.html
Your best bet is to link your app against the 4.1 client library.
I just tried this. Or I think I did. I uninstalled, and
reinstalled mysql v4.1.10a, which I assume has the 4.1
client library. I recompiled, relinked, and I get the
same error. Again, I can connect using the mysql CLI, it's
just connecting through the API which is giving me problems.
I can connect to the 4.1.1 server with the mysql CLI, but
only the 4.0 server with the API. I did have to make one
minor change to the code to get it to recompile. Is there
some other API issue which I need to be aware of?
The code I use to connect is:
_mysqlconn = mysql_init (NULL);
if (_mysqlconn == NULL)
{
print_error (NULL, mysql_init() failed (probably out of memory));
return -1;
}
/* connect to server */
if (mysql_real_connect (_mysqlconn, host_name, user_name, password,
database_name, opt_port_num, opt_socket_name,
opt_flags) == NULL)
{
print_error (_mysqlconn, mysql_real_connect() failed);
mysql_close (_mysqlconn);
_mysqlconn = NULL;
return -1;
}
And the failure occurs during mysql_real_connect with error 1045
Access denied for user: and not the
Client does not support authentication protocol requested
by server; consider upgrading MySQL client
that the web-page indicates that I might expect. Again, I
*can* connect with the mysql CLI, it is only from the API
where I'm having difficulty.
Referencing the web page, it appears that the 4.1 server is
using 16-byte passwords, and not the 41-byte passwords. It
might be that the server was started with --old-passwords
option, but how can I find out if that is the case?
It might be that the API is generating long password values,
when I need short password values. Can I control this behaviour
through the API?
- Andrew
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Re: MySQL C API problems
On Fri, 25 Mar 2005, Andrew Prock wrote: On Fri, 25 Mar 2005, Michael Stassen wrote: Password hashing was changed in 4.1 to improve authentication security, but this complicates backward compatibility. See the manual for details: http://dev.mysql.com/doc/mysql/en/old-client.html http://dev.mysql.com/doc/mysql/en/password-hashing.html Your best bet is to link your app against the 4.1 client library. Thank you for your assitance. I have determined that amidst all my horrid code there is a bug that is totally unrelated to MySQL, and it's version number, but that was related to port numbers. Since both servers are at the same domain, they are accessed through different ports, and while I thought I was handling ports correctly, I was always using the default port. Thanks again, - Andrew -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe:http://lists.mysql.com/[EMAIL PROTECTED]
Mysql C API problems
hi there
the present serves for some clearing some doubts i have:
1 - if i wanna make an action based on the fact that a query i just made
won't return results (empty set), how can i test that?
will this do?
if(!mysql_query(myData, query)
{
results = mysql_store_results(myData);
if(mysql_num_rows() == 0)
{
//action;
}
}
2 - if the the row is made of one single field wich in turn is an integer,
how can i address to it's value?
will this do?
row = mysql_fetch_row( results );
if(row[0]!=NULL)
{
tempo=_registo[0]-decimals; //?!??!?!?
//other actions here
}//if
thank u in advance,
Compliments
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RE: Mysql C API problems
1 - if i wanna make an action based on the fact that a query i just
made
won't return results (empty set), how can i test that?
will this do?
if(!mysql_query(myData, query)
{
results = mysql_store_results(myData);
if(mysql_num_rows() == 0)
{
//action;
}
}
That's right, except mysql_num_rows() takes a pointer to the results you
get from mysql_store_results(), so it looks like this:
if( mysql_num_rows( result ) == 0 )
{
// action
}
2 - if the the row is made of one single field wich in turn is an
integer,
how can i address to it's value?
Like this:
MYSQL_ROW row = mysql_fetch_row( result );
int value = atoi( row[0] );
Dean Harding
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Re: Mysql C API problems
On Saturday, 29. June 2002 11:15, Hugo Veiga wrote:
Hello Hugo,
will this do?
if(!mysql_query(myData, query)
{
results = mysql_store_results(myData);
-if(mysql_num_rows() == 0)
+if (!mysql_num_rows(results))
{
//action;
}
}
with the above correction it should work :)
will this do?
row = mysql_fetch_row( results );
if(row[0]!=NULL)
{
tempo=_registo[0]-decimals; //?!??!?!?
//other actions here
}//if
The values in row are always represented as strings, so you have to use atoi,
atol, atof depends on the type, to convert it:
if ((row = mysql_fetch_row(results)) != NULL) {
tempo = atoi(row[0]);
}
Regards Georg
mysql, query
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