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Friday, August 17, 2018

Connect a wireless printer without WPS or USB

I just finished setting up DD WRT on my wireless router. Firestick conected to my new WLAN. Now I wanted to connect my HP Deskjet 3520 to my WLAN and the only way I could connect to the router seems WPS but that is not working on the router even though it has the button.
Anyhow. I know that this printer model has a web interface so I connected via WiFi Direct. Then I found my IP address on my mobile device. My IP was 192.168.179.200. Opened up the browser and went to 192.168.179.1 to access the printer's server. There it has a nice interface to connect to the wireless network of choice.

The settings from this point will depend on your particular setup.


Recap.
Connect via wifi direct.
Open the app that your printer works with. The one you use for sending print jobs to it.
That app will tell you the printer's IP address.
Navigate to that address and enjoy.



Tuesday, February 21, 2017

Replicating a MySQL 5.0 database from PHP

Some websites offer online services such as accounting, inventory, just to name a few. Yesterday I was trying to see if some code I wrote, before I upgraded to Ubuntu 16.04 LTS, still work with MySQL 5.0. I tried the old code that used inline password. Sure the database was created but it had no tables.

 So what the script used to do was:
  1. Create a database . No problem.
  2. Replicate the tables from a template database onto the new one. Error mentioned

Sure it had a little more logic but for sharing purposes I minified it so that others can tinker with it. The script used to insert new entry in a customers.company table including the new company's db  name. Then empty tables from template db were copied into it. Customers data is isolated this way making backups a lot easier.


So here is the minified code that replicates a database from PHP script as if running a command from the terminal.

edit permission for temp files with chmod 1777 /tmp
 

<?php
/* this is for a test website I was building */
 $dbusername = "admin_user";
$dbuserpass = "secretPa$$";
$dbname="new_customer_DB"; //use a more unique name
 $mysqli = new mysqli("localhost", $dbusername, $dbuserpass, "your_admin_db");

    $sql = "CREATE DATABASE `".$dbname."` /*!DEFAULT CHARACTER SET utf8 */;";


if ($mysqli->query($sql) ) {
    printf("$dbname successfully created.\n");
}

// dump database from master db into newly created one.
// dbname and masterdb are important
$masterdb ="customer_db_template";
$olduser= $dbusername;




$file = tempnam("/tmp", "FOO");

 $content= "[client]\n";
$content.= "user=$dbusername \n";
$content.= "password=$dbuserpass \n";
$content.= "host=localhost";
file_put_contents($file, $content);

print "<hr> ";

$cmd = "mysqldump --defaults-extra-file=$file 
      --routines --opt $masterdb | mysql 
      --defaults-extra-file=$file --host=localhost -C $dbname;";
print $cmd;
print "<pre>"; 

  system( $cmd   );  
unlink($file); //delete right away
mysqli::close ($mysqli );
print "</pre>";
?>


 

This does not drop your existing database. For $dbname you would want to use a unique name. Perhaps the company name and insert id.


Word of caution: this process creates a temporary file with username and password in the /tmp directoy. Be careful and test many times. Be sure to set permissions for /tmp folder. Script deletes (unlink) the file as soon as the replication is complete.