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WordPress: Hilfreiche SQL Queries

admin — Tue, 23 Feb 2010 09:28:47 +0000

Einige hilfreiche SQL Queries für die Pflege eines WordPress Blogs von Cats who code:

Delete post revisions

DELETE a,b,c FROM wp_posts a WHERE a.post_type = 'revision' LEFT JOIN wp_term_relationships b ON (a.ID = b.object_id) LEFT JOIN wp_postmeta c ON (a.ID = c.post_id);

Find unused tags

SELECT * From wp_terms wt INNER JOIN wp_term_taxonomy wtt ON wt.term_id=wtt.term_id WHERE wtt.taxonomy='post_tag' AND wtt.count=0;

Disable comments on older posts

UPDATE wp_posts SET comment_status = 'closed' WHERE post_date < '2009-01-01' AND post_status = 'publish';

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Joomal 1.5 nach WordPress 2.7 convertieren

admin — Fri, 22 May 2009 07:35:27 +0000

Scheint ja gerade einen Trend zu WordPress zu geben, erst Drupal nach WordPress, nun Joomla nach WordPress.

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Convert a Drupal 6 based Website to WordPress 2.7

admin — Thu, 21 May 2009 11:23:00 +0000

Social CMS Buzz zeigt an einem Beispiel wie eine Drupal 6 Seite nach WordPress 2.7 convertiert wird.

Their are various reasons as to why you may wish to convert a Drupal 6 based website to WordPress, maybe you want to convert a blog originally built upon Drupal to WordPress, it could be that you want a system thats a little easier to code themes for, or maybe you just prefer WordPress over Drupal, for us the reason was simply server load due to the amount of MYSQL queries drupal was consuming for what is not really a complicated website.

Spannend. Allerdings wird man noch einiges an Arbeit leisten müssen wenn man CCK, Views und andere Goodies übernehmen will.

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WordPress: Query Posts Widget

admin — Tue, 17 Mar 2009 12:53:39 +0000

Ich glaube ein neues WordPress Widget hat Einzug in meine Toolbox erhalten: Query Posts Widget

It lets you displays posts by nearly any criteria you can imagine using the query_posts() function, except you don’t need to know anything about PHP to use it. (…) Nearly 40 options are available in this widget, which you can use any number of times.

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WordPress: posts_where Hook

admin — Fri, 06 Mar 2009 12:22:43 +0000

bueltge demonstriert einige Einsatzmöglichkeiten des posts_where Hooks.

Gezeigt werden:

Beiträge der Zukunft im Loop
Seiten im Loop
Nur Beiträge im Loop, die älter als 5 Tage sind

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Joomla: SQL 2 Excel

admin — Mon, 23 Feb 2009 14:59:29 +0000

SQL 2 Excel ist ein recht spezielles Joomla 1.5 Modul, was aber sicher mal hilfreich sein kann:

SQL 2 Excel is a Joomla 1.5 module which allows you to deliver data from your database directly to your users as downloadable Excel files. Write any valid SQL query in the configuration of this module. The query is run when a user clicks the link and the current information in the database is delivered to the users browser as an Excel file.

Da man das SQL selbst schreiben muss sicher kein Modul für Anfänger, aber sehr praktisch wenn man weiß was man tun.

Vielen Dank für den Hinweis an Joomla Downloads

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Yahoo! Query Language

admin — Sat, 13 Dec 2008 23:22:56 +0000

YQL klingt auch spannend:

The YQL platform provides a single endpoint service that enables developers to query, filter and combine data across Yahoo! and beyond. YQL exposes a SQL-like SELECT syntax that that is both familiar to developers and expressive enough for getting the right data. Through the SHOW and DESC commands we enable developers to discover the available data sources and structure without opening another web browser.

Ausprobieren lässt sich YQL einfach mit der YQL-Console. Die Abfragen sehen z.B. so aus:

select title,abstract,url from search.web where query="pizza"

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SQL JOINS Visuell Erklärt

bvt — Fri, 12 Oct 2007 11:52:13 +0000

Jeff Atwood unternimmt einen schönen Versuch SQL JOINS visuell zu erklären.

Zwar wird in den Komentaren darauf hingewiesen, dass die Visualisierung nicht jeden Fall abdeckt, trotzdem ein lesenswertes Posting.

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PHP persistent MySQL connections

bvt — Tue, 14 Nov 2006 18:32:26 +0000

Der MySQL Performance Blog geht der Frage nach ob PHP persistent connections evil sind.

The reason behind using persistent connections is of course reducing number of connects which are rather expensive, even though they are much faster with MySQL than with most other databases. (…)

Lets talk now about why Persistent connections were disabled in mysqli extension. Even though you could misuse persistent connections and get poor performance that was not the reason. The real reason is - you could get much more problems with it.

Persistent connections were added to PHP during times of MySQL 3.22/3.23 when MySQL was simple enough so you could recycle connections easily without any problems. In later versions number of problems however arose - If you recycle connection which has uncommitted transactions you run into trouble. If you happen to recycle connections with custom character set settings you’re in trouble back again, not to mention about possibly changed per session variables.

via phpdeveloper

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Webbased MySQL monitoring Tools

bvt — Sun, 22 Oct 2006 17:35:31 +0000

Baron Schwartz untersucht auf onlamp.com Open Tools for MySQL Administrators

Sehr nützlich finde ich die beiden folgenden Programme:

There are two web-based mytop clones, phpMyTop and ajaxMyTop. These are useful when you don’t have shell access and can’t connect remotely to your database server, but can connect from a web server. ajaxMyTop is more recent and seems to be more actively developed. It also feels more like a traditional GUI program, because thanks to Ajax, the entire page does not constantly refresh itself.