Linux etc. » mysql

My first RMySQL session

Marianne — Thu, 21 Jan 2010 14:01:48 +0000

# 'fai1' is an empty MySQL database for which 'mpromber' has all privileges
mycon <- dbConnect(MySQL(),user='mpromber',dbname='fai1') # pass seems to be read from ~/.my.cnf
# dsub is a data frame:
dbWriteTable(mycon,"dsub",dsub) # create table "dsub"
dbDisconnect(mycon) # close connection

Time for lunch.

MySQL settings in ~/.my.cnf

Marianne — Thu, 21 Jan 2010 12:23:39 +0000

You can specify default settings for MySQL in the file ~/.my.cnf (create it if it doesn’t exist). E.g., you could spare yourself typing your password each time you connect with an entry in that file like this:

[client]
password='mypassword'

This gets loaded in addition to the system configuration file, which for me is at /etc/mysql/my.cnf.

How to run a web server off a usb flash drive

Marianne — Mon, 19 Nov 2007 09:58:16 +0000

Actually, turns out to be really easy:

Install Slax on the USB flash drive. Here’s how I did it.
Download the Xampp module for Slax. I got version 1.6.2 from here.
Copy the Xampp_1_*_.mo file that you downloaded to the modules folder on your USB flash drive.
Boot off the USB flash drive.
Open a terminal and type:
```
/opt/lampp/lampp start
```
Open Konqueror and navigate to the URL http://127.0.0.1. You should see the Xampp info screen.
To see what your webroot directory is, look at /opt/lampp/etc/httpd.conf. Here, it is /opt/lampp/htdocs.
I added a symlink in opt/lampp/htdocs to a directory called slax_files on the larger data partition on the usb drive (I had partitioned the drive and put Slax on the smaller partition). I can now access files in that folder at http://127.0.0.1:slax_drives/ (This symlink does not survive a reboot. See the next post on how to make it permanent.)

Drupal: how to disable broken module manually

Marianne — Wed, 14 Nov 2007 13:31:46 +0000

I did something wrong applying a patch to a module. This resulted in a broken site — I wasn’t able to see the Administration page anymore to disable the module (or any page for that matter).

Log on to your server via SSH.

mysql -p

Gets you into mysql.
To see your databases:

show databases;

To pick the drupal database:

use drupal;

Then, substituting the module name for module_name below:

UPDATE `system` SET `status` = '0' WHERE `name` = 'module_name' LIMIT 1;

Finally:

quit;

Importing mysql database from the commandline

Marianne — Wed, 04 Jul 2007 08:47:12 +0000

I’ll be moving this blog to a different host (unfortunately, because it isn’t easy to get German ISPs to change the DNS settings, I will also move it to the domain promberger.info at the same time). I can export the database using phpmyadmin, but on the new server I’ll have to import them from the commandline. These instructions should be all that’s needed.