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wordpress - sql query - comments table - delete all comments shorter that 50 characters

Posted on 2014-01-29
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Last Modified: 2014-09-19
On wordpress 3.8

on comments table

What sql query will delete all comments shorter than 50 characters  



P.S.

I have 10 questions, highest point level - open about sql queries

Soo, Lots of points for an sql guy
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Question by:Matt_Walker01
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3 Comments
 
LVL 38

Accepted Solution

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Tom Beck earned 500 total points
ID: 39820644
Something like this would do it.
$comments = $wpdb->get_results("SELECT * FROM wp_comments WHERE comment_approved=1");
foreach ($comments as $comment) {
    if (strlen($comment->content) < 50) {
        $wpdb->delete('wp-posts',
		array('comment_ID' => $comment->comment_ID)
	);
    }
}

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If you are wondering why your questions are being neglected I can offer a possibility. While there are some experts who collect points for sport on EE, most are genuinely interested in helping people with real world programming problems. The points are just recognition of their assistance. Your ten questions tend come off as a goof rather than real world problems. Why, for example, would anyone want to delete any comment shorter than 50 characters? Or why would anyone want to replace certain words in comments with random words? That's just messing with the data. It almost sounds malicious, like you're developing some malware to mangle WordPress sites.
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LVL 27

Expert Comment

by:Zberteoc
ID: 39820926
Use this:
delete from comments_table where length(comments_field)<50

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LVL 17

Expert Comment

by:jrm213jrm213
ID: 39820976
@Zberteoc

you have to be careful with the length function in MySQL because depending on the character type a character may count more than 1 byte.

length() function measures in bytes
char_length() function measures in characters.

http://dev.mysql.com/doc/refman/5.0/en/string-functions.html#function_length
http://dev.mysql.com/doc/refman/5.0/en/string-functions.html#function_char-length
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