Blog by Andreas Glaser » SQL

Import Mysql Dump with correct character encoding

Andreas Glaser — Mon, 09 Aug 2010 11:58:05 +0000

It happened to me quite a few times now, that I imported a mysql dump file and afterwards noticed that the character encoding was broken.
To help you guys preventing this from happening use following import command.

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1	mysql -u root -p --default_character_set utf8 NAME_OF_YOUR_DATABASE < mysql_dump_file.sql

The important argument is “–default_character_set utf8” to preserve the encoding.

Enjoy

(Python) Mysqldump Backup 1.1

Andreas Glaser — Mon, 12 Apr 2010 08:00:02 +0000

Backups are crucial!
Since that is fact I wrote a little script in Python to easily backup mysql databases on a linux server.

Note: There is a file embedded within this post, please visit this post to download the file.

How do i configure it?
After you downloaded the script to your Linux server you will need a few Linux packages. Execute the following commands as root:

apt-get update
apt-get install python mysqldump bzip2

What does it do?
This script dumps a certain database (or all databases) into a single mysql file, which is zipped (bzip2) afterwards.

Now edit the script with your preferred editor.

vim mysqldump-backup.py

Customize the following lines:

# 2. Config
mysqlUser = “root”
mysqlPwd = “YOUR_PASSWORD”
mysqlDatabase = “–all-databases”
dumpDir = “/tmp/”
dumpFile = “mysqldump-” + strftime(“%Y-%m-%d-%H-%M-%S”, gmtime()) + “.sql”

The last step is to make the script executable:

chmod u +x mysqldump-backup-1.1.py

Thats it!

You can now run the script:

/path/to/the/script/mysqldump-backup-1.1.py

To run it daily (crontab):

crontab -e

Add at the bottom:

0 3 * * * /path/to/the/script/mysqldump-backup.py

Now your databases will be backupped daily at 03:00 am

Download

Note: There is a file embedded within this post, please visit this post to download the file.

Changelog
1.1

Removed trailing semicolons
Renamed variables

1.0

Initial release

Have fun!
Andreas Glaser aka JaZz

SQL / Mysql – How to find and count duplicates

Andreas Glaser — Wed, 22 Oct 2008 09:18:37 +0000

Some developers facing the problem of duplicates in sql/mysql tables. To find and count them use the following statement.

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SELECT ID, count(*) as Amount
FROM name_of_the_table
GROUP BY ID
HAVING  Amount > 1

Just replace the used table “name_of_the_table” and the column “ID” which is inspected for duplicates. The output shows you the record which is multiple times in the table and the amount of it.

So long,
Andreas Glaser (aka JaZz)