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Need help writing a script that interacts with a MySQL DB

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FishMonger
Veteran / Moderator

Oct 20, 2012, 6:35 PM

Post #26 of 45 (18258 views)

Re: [MDTech.us_MAN] Need help writing a script that interacts with a MySQL DB [In reply to]	Can't Post

Did you try connecting from the command line using the same params as in the script? If that fails, then there is no reason to expect it to work in the Perl script. Once you're able to connect from the command line, then we can work on using those params in the script.

MDTech.us_MAN
Novice

Oct 20, 2012, 7:04 PM

Post #27 of 45 (18256 views)

Re: [FishMonger] Need help writing a script that interacts with a MySQL DB [In reply to]	Can't Post

In Reply To

I guess the connection is successful.
Here is what is I get in Debian:

Code

root@MDTech:~# mysql -h instance28854.db.xeround.com -P 18847 -u maxwell175 -p 
Enter password: 
Welcome to the MySQL monitor.  Commands end with ; or \g. 
Your MySQL connection id is *num_removed_by_me* 
Server version: 5.1.42 Source distribution 
 
Copyright (c) 2000, 2011, Oracle and/or its affiliates. All rights reserved. 
 
Oracle is a registered trademark of Oracle Corporation and/or its 
affiliates. Other names may be trademarks of their respective 
owners. 
 
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement. 
 
mysql>

Maxwell.

(This post was edited by MDTech.us_MAN on Oct 20, 2012, 7:05 PM)

MDTech.us_MAN
Novice

Oct 22, 2012, 7:23 PM

Post #28 of 45 (18247 views)

Re: [MDTech.us_MAN] Need help writing a script that interacts with a MySQL DB [In reply to]	Can't Post

Yes the connection is successful! I can retrieve some data from tables!

MDTech.us_MAN
Novice

Oct 23, 2012, 5:50 AM

Post #29 of 45 (18242 views)

Re: [MDTech.us_MAN] Need help writing a script that interacts with a MySQL DB [In reply to]	Can't Post

I still can't connect using Perl!

FishMonger
Veteran / Moderator

Oct 23, 2012, 7:12 AM

Post #30 of 45 (18237 views)

Re: [MDTech.us_MAN] Need help writing a script that interacts with a MySQL DB [In reply to]	Can't Post

Try changing your connect statement from:

Code

my $conn = DBI->connect('DBI:mysql:bcpadb;host=instance28854.db.xeround.com:18847', 'maxwell175', 'qwertyuiop', { RaiseError => 1 }) || die "Could not connect to the database";

to this:

Code

DBI->trace(4); # value can be between 0 and 15 
my $conn = DBI->connect('DBI:mysql:bcpadb:instance28854.db.xeround.com:18847', 
                        'maxwell175', 'qwertyuiop', 
                        { RaiseError => 1 }) 
        or die "Could not connect to the database " . $DBI::errstr;

There are 2 changes being made: 1) the addition of the trace (low level debugging) and 2) slight change in syntax on the connect statement,

FishMonger
Veteran / Moderator

Oct 23, 2012, 7:19 AM

Post #31 of 45 (18235 views)

Re: [MDTech.us_MAN] Need help writing a script that interacts with a MySQL DB [In reply to]	Can't Post

You may want to read the documentation regarding setting/using trace.

http://search.cpan.org/~timb/DBI-1.622/DBI.pm#TRACING

MDTech.us_MAN
Novice

Oct 23, 2012, 1:46 PM

Post #32 of 45 (18232 views)

Re: [FishMonger] Need help writing a script that interacts with a MySQL DB [In reply to]	Can't Post

In Reply To

You may want to read the documentation regarding setting/using trace.

http://search.cpan.org/~timb/DBI-1.622/DBI.pm#TRACING

Ok, I tried the code you gave , but still, same message:

Code

Software error: 
 
Could not connect to the database Can't connect to MySQL server on 'instance28854.db.xeround.com' (111) at /home/www/mdtech.us.ms/BCPA/BCPA_form/PROC/index.cgi line 15. 
 
For help, please send mail to the webmaster ([no address given]), giving this error message and the time and date of the error.

FishMonger
Veteran / Moderator

Oct 23, 2012, 2:01 PM

Post #33 of 45 (18229 views)

Re: [MDTech.us_MAN] Need help writing a script that interacts with a MySQL DB [In reply to]	Can't Post

The trace output goes to stderr by default, not stdout. You need to redirect it to the browser or to a file.
To redirect it to the browser you need to do this:

Code

use CGI::Carp qw(fatalsToBrowser warningsToBrowser);

Then after outputting the html header, add this:

Code

warningsToBrowser(1);

When redirected to the browser via warningsToBrowser, they show up as html comments, so you'd need to "view source" to see that output.

To redirect the trace output to a file, you add the optional "file" parameter to the DBI->trace call.
http://search.cpan.org/~timb/DBI-1.622/DBI.pm#Trace_Output

(This post was edited by FishMonger on Oct 23, 2012, 2:03 PM)

MDTech.us_MAN
Novice

Oct 25, 2012, 9:41 AM

Post #34 of 45 (18222 views)

Re: [FishMonger] Need help writing a script that interacts with a MySQL DB [In reply to]	Can't Post

In Reply To

The trace output goes to stderr by default, not stdout. You need to redirect it to the browser or to a file.
To redirect it to the browser you need to do this:

Code

use CGI::Carp qw(fatalsToBrowser warningsToBrowser);

Then after outputting the html header, add this:

Code

warningsToBrowser(1);

Ok, I got the warning:

Code

<!-- warning: DBI connect('bcpadb:instance28854.db.xeround.com:18847','maxwell175',...) failed: Can't connect to MySQL server on 'instance28854.db.xeround.com' (111) at /home/www/mdtech.us.ms/BCPA/BCPA_form/PROC/index.cgi line 17 --> 
<h1>Software error:</h1> 
<pre>Could not connect to the database Can't connect to MySQL server on 'instance28854.db.xeround.com' (111) at /home/www/mdtech.us.ms/BCPA/BCPA_form/PROC/index.cgi line 17.</pre> 
<p> 
For help, please send mail to the webmaster (<a href="mailto:[no address given]">[no address given]</a>), giving this error message  
and the time and date of the error. 
 
</p>

Maxwell.

FishMonger
Veteran / Moderator

Oct 25, 2012, 10:25 AM

Post #35 of 45 (18217 views)

Re: [MDTech.us_MAN] Need help writing a script that interacts with a MySQL DB [In reply to]	Can't Post

Ok, that output does not include the trace output. Did you enable tracing and if so did you redirect via warningsToBrowser(1) or to a file as shown in the DBI documentation?

You should go back through your posts and remove your db username and password so that other can't access the db!!

Here's my working test script which accesses your database.

Code

#!/usr/bin/perl 
 
use strict; 
use warnings; 
use DBI; 
 
my $dsn = 'DBI:mysql:bcpadb:instance28854.db.xeround.com:18847'; 
my $dbh = DBI->connect($dsn, '*******', '*******', 
                        { RaiseError => 1 }) 
        || die "Could not connect to the database " . $DBI::errstr; 
 
my $sth = $dbh->prepare("SELECT * FROM people2"); 
$sth->execute; 
 
while (my @row = $sth->fetchrow_array) { 
    print "@row\n"; 
}

Output:

Quote

c:\testing>MDTech.us_MAN.pl
John Doe 21 Summer Dr Holland 18966 N/A N/A N/A N/A N/A Unemployed 2155794610 N/A N/A johndoe@buckscoparalegals.com

The root of your problem is that you didn't properly setup the user rights in my mysql database. Your db table is empty. It should have entries in it specifying who can access the database and from where. You need to use the mysql grant function to setup those rights.

http://dev.mysql.com/doc/refman/5.1/en/grant.html

MDTech.us_MAN
Novice

Oct 25, 2012, 10:59 AM

Post #36 of 45 (18214 views)

Re: [FishMonger] Need help writing a script that interacts with a MySQL DB [In reply to]	Can't Post

Hello:

I used your code in my script and everything works fine, but, when I tried running that same script using my hosting service, it doesn't work!!!

Code:
http://pastebin.com/kK9tD2D4

(This post was edited by MDTech.us_MAN on Oct 25, 2012, 11:05 AM)

FishMonger
Veteran / Moderator

Oct 25, 2012, 11:47 AM

Post #37 of 45 (18211 views)

Re: [MDTech.us_MAN] Need help writing a script that interacts with a MySQL DB [In reply to]	Can't Post

Saying "it doesn't work" doesn't tell me anything. What does "doesn't work" mean? What was the error/trace output?

(This post was edited by FishMonger on Oct 25, 2012, 11:47 AM)

MDTech.us_MAN
Novice

Oct 25, 2012, 2:10 PM

Post #38 of 45 (18206 views)

Re: [FishMonger] Need help writing a script that interacts with a MySQL DB [In reply to]	Can't Post

In Reply To

Saying "it doesn't work" doesn't tell me anything. What does "doesn't work" mean? What was the error/trace output?

Sorry for not being specific. I meant that I get the same thing as I described in my previous post:

Quote

Ok, I got the warning:

Code

<!-- warning: DBI connect('bcpadb:instance28854.db.xeround.com:18847','maxwell175',...) failed: Can't connect to MySQL server on 'instance28854.db.xeround.com' (111) at /home/www/mdtech.us.ms/BCPA/BCPA_form/PROC/index.cgi line 17 -->  
<h1>Software error:</h1>  
<pre>Could not connect to the database Can't connect to MySQL server on 'instance28854.db.xeround.com' (111) at /home/www/mdtech.us.ms/BCPA/BCPA_form/PROC/index.cgi line 17.</pre>  
<p>  
For help, please send mail to the webmaster (<a href="mailto:[no address given]">[no address given]</a>), giving this error message   
and the time and date of the error.  
  
</p>

Maxwell.

FishMonger
Veteran / Moderator

Oct 25, 2012, 2:37 PM

Post #39 of 45 (18204 views)

Re: [MDTech.us_MAN] Need help writing a script that interacts with a MySQL DB [In reply to]	Can't Post

In Reply To

Hello:

I used your code in my script and everything works fine, but, when I tried running that same script using my hosting service, it doesn't work!!!

Please clarify. Does that mean that you tested it on 2 different systems, your test system and your hosting service provider's system? Or, on the same system under 2 separate environments, command line and web page?

MDTech.us_MAN
Novice

Oct 25, 2012, 7:05 PM

Post #40 of 45 (18199 views)

Re: [FishMonger] Need help writing a script that interacts with a MySQL DB [In reply to]	Can't Post

Ok, here is the set up:
My Computer: Strawberry Perl (Windows x64)
Hosting service: Apache with Perl and (I think) Linux
NOTE: I do not have physical or console access to the above server!

Maxwell.

In Reply To

Hello:

I used your code in my script and everything works fine, but, when I tried running that same script using my hosting service, it doesn't work!!!

FishMonger
Veteran / Moderator

Oct 25, 2012, 7:44 PM

Post #41 of 45 (18196 views)

Re: [MDTech.us_MAN] Need help writing a script that interacts with a MySQL DB [In reply to]	Can't Post

Quote

NOTE: I do not have physical or console access to the above server!

The problem you're experiencing is a perfect example why I always make sure I have shell (ssh) access to the server.

Since I'm able to gain direct remote access to your database on your web host but you can't access it through your web site on that server, shows that the database access rights aren't setup correctly. I don't know if that's due to a mistake on your end or your web host, but at this point you should contact your web host.

If you haven't reset the access rights, I might be able to login and fix it for you, but that would not be appropriate.

MDTech.us_MAN
Novice

Oct 25, 2012, 8:09 PM

Post #42 of 45 (18192 views)

Re: [FishMonger] Need help writing a script that interacts with a MySQL DB [In reply to]	Can't Post

In Reply To

Quote

NOTE: I do not have physical or console access to the above server!

I already set the rights to ALL using phpMyAdmin.

Maxwell.

MDTech.us_MAN
Novice

Oct 25, 2012, 8:11 PM

Post #43 of 45 (18191 views)

Re: [FishMonger] Need help writing a script that interacts with a MySQL DB [In reply to]	Can't Post

In Reply To

Quote

NOTE: I do not have physical or console access to the above server!

Also, tomorrow I will try setting up the server on my Windows server that I have at my house.

Maxwell.

P.S. Don't forget to read my above post!

(This post was edited by MDTech.us_MAN on Oct 25, 2012, 8:11 PM)

FishMonger
Veteran / Moderator

Oct 25, 2012, 8:39 PM

Post #44 of 45 (18186 views)

Re: [MDTech.us_MAN] Need help writing a script that interacts with a MySQL DB [In reply to]	Can't Post

In Reply To

I already set the rights to ALL using phpMyAdmin.

Maxwell.

Your rights are still too permissive. I still have direct access to your db as well as the root mysql db.

MDTech.us_MAN
Novice

Oct 26, 2012, 7:29 AM

Post #45 of 45 (18181 views)

Re: [FishMonger] Need help writing a script that interacts with a MySQL DB [In reply to]	Can't Post

Well, is there a SQL command I could run to set the correct permissions?

Also, I am currently setting up my home Windows server. If you have any requirements for setting up perl, reply to this message.

Maxwell.

In Reply To

I already set the rights to ALL using phpMyAdmin.

Maxwell.

Your rights are still too permissive. I still have direct access to your db as well as the root mysql db.

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