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10 Newer Entries Showing entries 31 to 40 of 92 10 Older Entries

Displaying posts with tag: Scripting (reset)

Perl TCP Listener for Detecting Available Ports for MySQL Enterprise Monitor
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I recently visited a client for the purpose of installing and demonstrating MySQL Enterprise Monitor.

If you are unfamiliar with the MySQL Enterprise Monitor – from the MySQL web site: The MySQL Enterprise Monitor continuously monitors your MySQL servers and alerts you to potential problems before they impact your system. Its like having a “Virtual DBA Assistant” at your side to recommend best practices to eliminate security vulnerabilities, improve replication, optimize performance and more. As a result, …

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Convert .csv File to MySQL Database via Perl
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Have you ever had a spreadsheet file or a large .csv file that you wanted to manipulate, but you want more power than a spreadsheet program could offer?

Before I started using MySQL, I would usually throw the .csv file into a desktop database program, like FileMaker. FileMaker would allow you to import the .csv file and it would automatically create the column headers for you. Recently, I was given a spreadsheet with 27,000 rows in it. I still use FileMaker for some databases, but I wanted the power of MySQL to manipulate the information contained in this file. So, I could have easily just typed out the database column names …

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Scripting Backups of MySQL with Perl via mysqldump
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MySQL provides you with a nice utility for creating a backup of your databases. From the mysqldump documentation page: “The mysqldump client is a backup program originally written by Igor Romanenko. It can be used to dump a database or a collection of databases for backup or transfer to another SQL server (not necessarily a MySQL server). The dump typically contains SQL statements to create the table, populate it, or both. However, mysqldump can also be used to generate files in CSV, other delimited text, or XML format.”

The mysqldump …

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Retrieving Data from MySQL via PHP
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So far, we have looked at connecting to a MySQL database via Perl and Python. Next, we will look at connecting via PHP. I am assuming that you have already installed PHP or have the ability to run PHP scripts on your server, and that you have MySQL installed as well.

This example will use the same address table from the previous post, Inserting Data into MySQL with Perl.

Here is the SQL statement that we used to create the table:

SET NAMES latin1;

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Inserting Data into MySQL with Perl
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In the two previous posts, we looked at simply connecting to a MySQL database via Python and Perl. In this post, we will:

- use an insert statement to input data into a MySQL table via Perl
- use a select statement to view the same data to confirm our results

For this example, we will use a table named “address”. Here is the SQL statement that we used to create the table:

SET NAMES latin1;

CREATE TABLE `address` (
  `name_first` varchar(30) NOT NULL,
  `name_last` varchar(30) NOT NULL,
  `address_01` varchar(40) NOT NULL,
  `address_02` varchar(40) NOT NULL,
  `address_city` …

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Connecting to MySQL with Perl
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When I was designing web sites, for a long time I wrote my HTML code the “hard” way – by opening a text editor and manually typing in the code (this was before I purchased Adobe DreamWeaver).

During that time of manual HTML writing, I had a project that required forms on a web page, and I needed a place to store the information. After talking with a few tech friends, I decided to use MySQL as my web site database, and Perl as my scripting language.

I had written complex Bourne shell scripts before, but Perl was something …

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pipe viewer – monitoring / limit the throughput of a pipe
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Pipe viewer is a command line tool which is used to monitor the throughput, display the estimated time of completion or to limit the transfer rate of a pipe (pipeline).

Install pipe viewer on Debian / Ubuntu with the following command.

apt-get install pv

On CentOS / Fedora / RedHat use the yum command to install pipe viewer

yum install pv

To use pipe viewer just insert the pv command between two processes to monitor the throughput of the pipe.

cat logfile.log.1 | pv | gzip -9 > logfile.log.1.gz
9,18MB 0:00:01 [ 9,1MB/s] [   <=>

Or limit the …

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Win a free book at the February Python Book Contest
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This month is a special month. It’s not because of Valentines day or even the exciting day where we see groundhogs. No, this month is special because I’m have a book contest where you, the reader, get to win something free for doing absolutely nothing more than posting a comment saying that you want one of the several books I have available in the contest.

So without getting into boring details I’ll keep this short. I’ve been reviewing a lot of books lately and I think it’s time to get some books into people’s hands to enjoy themselves. This month the giveaways are all Python oriented.

So, all you have to do is take a look at the following …

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Simple Python: a job queue with threading
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Every so often you need to use a queue to manage operations in an application. Python makes this very simple. Python also, as I’ve written about before, makes threading very easy to work with. So in this quick program I’ll describe via comments, how to make a simple queue where each job is processed by a thread. Integrating this code to read jobs from a mysql database would be trivial as well; simply replace the “jobs = [..." code with a database call to a row select query.

#!/usr/bin/env python
## DATE: 2011-01-20
## FILE:
## AUTHOR: Matt Reid
from Queue import *
from threading import Thread, Lock

'''this function …
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check the status / exit code of pipelined commands with PIPESTATUS
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While I was optimizing an old mysql table copy script, I found the PIPESTATUS Shell Variables in the bash manual.
PIPESTATUS is an array with the status / exit codes of the last pipelined commands. ( A pipeline is a sequence of one or more commands separated by the character | (pipe).)

The following example script uses PIPESTATUS to check the exit code of mysqldump and mysql. If one of these commands fails, the script will exit and print an error message.


tables="table1 table2 table3"

for table in $tables
       mysqldump $dbname $table | mysql -h …

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10 Newer Entries Showing entries 31 to 40 of 92 10 Older Entries

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