The wpdb class, accessed via the $wpdb global variable, is used to interact with the WordPress database

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Why am i getting this error? WordPress database error: [Query was empty]

I am using Wordpress 3.4.2, latest version! I have no plugins installed except the one that I am writing. So Here's the deal, I'm reading a json feed and i'm trying to import its content into a ...
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668 views

Mysql query LIKE not working

I'm using this code. $blog_list = $wpdb->get_results( "SELECT " . $extra . "blog_id, last_updated FROM " . $wpdb->blogs. " WHERE public = '1' AND archived = '0' AND mature = '0' AND spam = '0' ...
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494 views

Bootstrapping Wordpress MultiSite Outsite of Wordpress - No $wpdb

I'm working on a plugin for a system to use Wordpress as the authentication backend, so that I can use my existing Wordpress users in another application. The plugin works great when running in single ...
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4k views

How does $wpdb handle COUNT(*)

I understand how to do simple queries and display results using $wpdb. This is my process: <?php $sql = 'select * from wp_votes;'; ?> <?php $votes = $wpdb->get_results($sql); ?> ...
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1k views

$wpdb doesn't appear to work on page inside of a plugin

I have a plugin folder foobar. Inside this plugin I have a page called foobar.php. Inside this page I have global $wpdb; $orderby = (!empty($_REQUEST['orderby'])) ? $_REQUEST['orderby'] : ...
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251 views

$wpdb->replace / Replace or update primary key

I write code to save data in to the database table. I want Replace a row in a table if it exists or insert a new row in a table if the row did not already exist. ...
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4k views

Alternative to mysql_real_escape_string

I have a WordPress plugin that at one point I need to see if a certain title exists in the database. For 2 years, this code worked fine: $myposttitle= $wpdb->get_results( "select post_title ...
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51 views

How to use IN array properly in Wordpress?

I have an array containting these values (including the apostrohpes): 'course_3202','course_3201','course_3200','course_3199' I try to fetch results from these values in postmeta-table. SELECT * ...
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27 views

get the number of queries made on a page(inside my plugin)

Is there an easy way to see how many queries you make on a page(inside my plugin)? As I dont want to many queries in my plugin.
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563 views

Replace Main Query With Custom Query

I want to replace the main query with my own custom query. The thing is I don't want to go through the hassle of manual paging. I know there's a filter posts_results but I'm not sure how to use it ...
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561 views

Inserting large amounts of data into a custom table during plugin install

I am working on a WordPress plugin that creates several new tables into the database. It also loads some default data into the tables from CSV files. Most of these are small and loading the data works ...
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83 views

Doing a loop with multiple DBs simultaneoulsy

I have a website setup made up of with more than 3-4 WordPress setups as subdirectories of main. For example: Site | ---------- Site/Site1 | ---------- Site/Site2 | ---------- Site/Site3 Each have ...
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509 views

Using WPDB class

I want to use the wpdb class on my external page not associated with wordpress. I tried to include the following on the php file: // include wordpress functions include( $_SERVER['DOCUMENT_ROOT'] . ...
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393 views

How Can I Use $wpdb in PayPal IPN file?

I'm currently writing a plugin that requires the PayPal IPN, since the IPN is not inside the main plugin file, I have no way to use $wpdb. If you know a way to do this that will work with all ...
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29k views

How to parse row results from $wpdb -> get_results

I have the following: $query = 'SELECT * FROM wp_pod_tbl_add_questions WHERE id LIKE '. $id; $row = $wpdb -> get_results($query); How do I get the ...
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1answer
3k views

Safe way to find last inserted id in a table?

Is it safe to use $wpdb->insert_id; to find the id of a last updated row id just after an update? ex: $sql = $wpdb->insert($table_name, $arrayWithDataToInsert, array('%s','%s')); ...
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31 views

How would I format a query that depends on post parent taxonomy

I'm trying to do a custom query which is outside the scope of a single WP_Query, I think I should be using $wpdb but my SQL is a bit ropey. Also I only need the post IDs returned not post objects. ...
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15 views

When and why should I use $wpdb different return types?

This one returns an object $mylink = $wpdb->get_row("SELECT * FROM $wpdb->links WHERE link_id = 10"); An associative array $mylink = $wpdb->get_row("SELECT * FROM $wpdb->links WHERE ...
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21 views

How can I migrate mysql_fetch_array to $wbpdb?

I am migrating a script with direct MySQL access to the $wpdb class, but it fails. Below is both original and new code next to each other. What is wrong? <!-- ...
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42 views

How does the WXR file differ from the WPDB?

I'm looking to make it so an administrator can do a complete backup of a WordPress website with the click of a button in the administration pages. In doing so, I figure the code would need to backup ...
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346 views

Why $wpdb->show_errors() and print_error() is showing an output even if the query output is correct?

In order of figuring out the following issue, see Sanitize a working query string by using $wpdb->prepare() fails with MySQL DB error "right syntax to use near '3' at line 1" i ...
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88 views

wpdb custom post_type problem

I want to use custom post type in my custom SQL query, but, when I add the custom post type im my query, I get no results. Where's my probelm ? This is the code I've tried $top5_ov_performance = ...
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568 views

MySQL LIKE not working

It seems MySQL's LIKE operator behaves like a = operator. The following MySQL query returns the expected result (1 entry): $meta_key = '_locality'; $meta_value = 'The Hague'; $post_ids = ...
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522 views

What is _transient_random_seed for?

This is a very short question. _transient_random_seed is in wp_options. What is it for?
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178 views

Wordpress SQL query - returning 'true' 'false' or 'null'

I am working on coding a PHP form for my website that requires the user to enter a code before the form becomes active. I have a field called "used" that I set up as a Boolean/TinyInt which I thought ...
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205 views

Wordpress database error - Error in SQL syntax - I can't identify any error?

I am trying to write function that checks whether an email address is stored in my database or not. I've written the following PHP code:: function check_my_users( $email_address ) { global ...
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73 views

Get published posts and pages?

I'm working on a plugin to use gettext in posts and pages content. I'm trying to get all published posts and pages in order scan them for translatable strings, but I cannot figure out how to do it. ...
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97 views

Rolling Back from current WordPress version to previous one

What happens if we rollback from (for example) 3.8 to 3.5.1 and keep the same new DB created by the current version? Will that break anything?
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3k views

wpdb->insert multiple record at once

So after I have created the table 'settings-table' i want to add a couple of records to it. This is how I want to do it, not the best way, so I need a better way to do this because I will add more ...
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1answer
4k views

Delete row of custom table in WordPress using AJAX

From my custom table ($table = $wpdb->prefix . 'user_req';) I'm showing data with $wpdb->get_results() and a foreach loop: I managed to update the database with the individual values from the ...
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137 views

What's the purpose / logic of split_the_query in WP_Query->get_posts

In the get_posts method of WP_Query, there's a section relating to split_the_query The logic of split_the_query is $split_the_query = ( $old_request == $this->request && ...
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88 views

WPDB query - decrypting DB data

I am trying to grab data from the DB using WPDB but I am stuck on how to decrypt the data e.g. The data is stored as: a:2:{i:0;s:2:"92";i:1;s:2:"71";} I want the 92 & 71 as that's my post IDs, ...
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495 views

Why does $wpdb return strings for mysql integer values?

I find it very inconvenient and hard to understand that the default behavior of the Wordpress db-interface is to convert all integer (and float?) types to strings. e.g $wp_posts = ...
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54 views

Make one query for adding entries to database

I have a situation where I need several entries to be added to a database table (sometime a few hundred), but using $wpdb->insert() (and $wpdb->update() where edits are necessary) is running ...
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680 views

create drop down menu in theme customizer from custom db

what i am trying to do is create drop down menu in theme customizer from custom db i have created. db name "students". in the db i have only the id and the name. i want to show all students names in ...
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653 views

Merging PHP download script into `functions.php`

I run a large mixtape download site on WordPress. I'm currently developing a new theme and I'd like to include as much site functionality into the theme's functions.php. For serving the downloads, I ...
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827 views

wp-admin post.php JavaScript Links Not Working

I just recently noticed in my backend admin panel none of the dynamic JavaScript links will open or work at all. This includes the 'Edit' links next to Status, Visibility, and Scheduled. Also the slug ...
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1answer
155 views

Modify the structure of data returned by $wpdb

Modify the structure of multidimensional array outputed by SQL via $wpdb The output that I need from $wpdb is easily achievable by running multiple queries within foreach. However, I am trying to ...
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45 views

Where to store the name of a custom table?

I'm extending the $wpdb object with properties for my custom tables. function setup_wpdb() { global $wpdb; // Create properties for custom tables $wpdb->my_plugin_table1 = ...
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1answer
3k views

ob_end_flush error when using wpdb in plugin

I created a small plugin to test database interactions in wordpress. I have a small function that inputs the arguments to the table. If i call my function in a themefile it inputs my test values to ...
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613 views

$wpdb: Counting posts corresponding to 3 terms in 3 different taxonomies

It's easier if I made an example: I have a custom post type MYPOSTTYPE, with 3 taxonomies TAX_1, TAX_2 and TAX_3 If I have 3 terms: 'TERM_TAX_1' in TAX_1, 'TERM_TAX_2' in TAX_2, and 'TERM_TAX_3' in ...
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2k views

Increment value (value = value+1) of $wpdb->update

This sql query $wpdb->query("UPDATE log SET total=total+1 WHERE id='1')"); How do I turn it into $wpdb->update() statement? Ex. $wpdb->update('log', array('total'=>'total+1'), ...
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461 views

Join new table with SQL query

I created a plugin with a new table (wp_soundcloud) and I need to retrieve the data from that new table along with the post data. Here is my query: $querystr = " SELECT $wpdb->posts.*, ...
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620 views

wpdb Custom Meta Data with 2 conditions

This is one of those problems that I've spent way too much time on, and there is probably a VERY simple solution that I am missing. Any help would be greatly appreciated. I am trying to populate a ...
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1answer
377 views

using custom taxonomies on non wp table?

I'm building a program registration system that will have a complex data structure. There are programs (custom post type, CPT), teachers (CPT), registrations (custom table and meta table), payments ...
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182 views

Most effective use of DB querys

I've got a custom database table with lots of data that I'd like to query several times from a custom template file I've built. Say the db table looks like this: id name city zip 23 ...
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904 views

Call External Object in Class Function During Callback

I've a class which has a function that check and creates table in database. In order to do so i need to use WordPress $wpdb object. I need the function to run only on first plugin activation, so i ...
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288 views

In what part of the Wordpress core does the users table and usermeta table get joined?

I have been trying to work out just where in the massive jungle of Wordpress include classes the usermeta table is joined onto the users table and if so, how does it work? The one confusing thing ...
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47 views

Getting users who registered 360 days from current date

As per the title, what I want to do is run a custom query that (using WP-Cron) will run once a day to check for users who registered exactly 360 days before the current date (don't need time, just ...
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42 views

Convert simple SQL Query to WordPress query

I'm trying to 'batch' update the value in my post_parent fields in my wp_posts table. I can do it from within phpmyadmin using the following SQL Query: UPDATE wp_posts SET post_parent = '8' WHERE ...