spechal.com » MySQL

Very simple MySQL backup bash script

Spechal — Fri, 23 Dec 2011 09:07:07 +0000

This code backups up mysql databases and gzips them into the current working directory. If you want to backup the mysql table, remove it from the for loop.

#!/bin/bash

usage(){
        echo "Usage $0  "
        exit 1
}

if [[ "$2" != "" && "$2" == "" ]]
then
        usage
fi

USER=$1
PASS=$2
if [ "$3" != "" ]
then
  DB_HOST=$3
else
  DB_HOST="localhost"
fi

for db in `mysql -u$USER -p$PASS -h$DB_HOST -e 'show databases' | cut -f2 | awk '{ print $1 }' | grep -v "Database\|mysql\|information_schema\|test"`;
do
  echo "Working with $db"
  mysqldump -u$USER -p$PASS -h$DB_HOST $db > $db.sql
  gzip $db.sql
done;

echo "Finished";

Python MySQL Associative Array

Spechal — Fri, 27 Nov 2009 23:26:04 +0000

By default, the MySQLdb module to access a MySQL database returns the data as an integer indexed array. Sometimes this is not desirable and an associative array is preferred, such as the mysql_fetch_assoc function in PHP. In addition, we will be using the pprint module which is similar PHP’s print_r

Here is the Python equivalent:

import MySQLdb
import pprint
# connect to the database here
db = MySQLdb.connect(...)
c = db.cursor(cursorclass=MySQLdb.cursors.DictCursor)
query = "SELECT `name`, `address` FROM `table`"
c.execute(query)
rows = c.fetchall()
c.close()
pprint.pprint(rows) # i.e. print_r($rows)

Hope that helps someone.

PHP function to validate MySQL UUID or GUID

Spechal — Sun, 15 Nov 2009 23:59:51 +0000

/**
   *  Function to validate a generated GUID / UUID
   *  @param string $guid GUID
   *  @return bool
   */
  function validGUID($guid){
    return preg_match('#^[a-z0-9]{8}-[a-z0-9]{4}-[a-z0-9]{4}-[a-z0-9]{4}-[a-z0-9]{12}$#', $guid);
  }

PHP function to emulate MySQL UUID

Spechal — Sun, 15 Nov 2009 23:58:15 +0000

/**
   *  uuid
   *
   *  uuid() simply replicates MySQL's UUID function, which returns a 36
   *  character "random" hash (32 alphanumeric, 4 dashes).
   *  @return string
   */
  function uuid(){
    return sprintf('%04x%04x-%04x-%04x-%04x-%04x%04x%04x',
      mt_rand(0, 0xffff), mt_rand(0, 0xffff), mt_rand(0, 0xffff),
      mt_rand(0, 0x0fff) | 0x4000,
      mt_rand(0, 0x3fff) | 0x8000,
      mt_rand(0, 0xffff), mt_rand(0, 0xffff), mt_rand(0, 0xffff));
  }