I have a website with coupons and a large database. In wp_postmeta most of my posts have a store_id, because I use the plugin Yoast SEO and it sets the meta_key and the meta_value. Not all of my coupons have a store_id in the wp_postmeta, like the older coupons or some of them who was copied from the old ones, or who came automatically through API.
If I update every coupon and re-click the store part, the post gets the store_id written in the table wp_postmeta. But I have more than 50 000 coupons... I need the store_id set for every coupon I have, for other tasks I need to do.
Is there an easier way how to do this, without manually updating every coupon?
First, please make a backup.
If I understand correctly, yoiu need to change every row in the wp_postmeta table to set the store_id to the same value. If I've misunderstood in some way, that is, if you need to set a different value for some rows or if you don't want to over-write existing data, you should stop reading here. I don't know anything about Yoast SEO and only know as much as I've perceived from your post here.
But changing a single column for all rows is easy. You need an SQL statement something like this:
UPDATE `wp_postmeta` SET `store_id`=1
That will change the store_id of every row in wp_postmeta to 1.
Since you've tagged phpMyAdmin, presumably you're using that as your interface. Just click the SQL tab once you're in your WordPress database to enter the text of the query directly there.
Related
I am having trouble fully understanding the schema of the WordPress comments and commentmeta tables, and how they are linked together.
I'd like to learn by making a custom row in each table (wp_commentmeta & wp_comments).
WordPress Database Schema
Following is the example I am working with.
wp_commentmeta:
meta_id | comment_id | meta_key | meta_value
2 1352 verified 1
What does the meta_value denote in the wp_commentmeta table? Is this a rating system 0-5, or similar?
wp_comments
comment_ID | comment_post_ID | misc_cols --- | user_id
2,1352,Waldo,test#test.com,"",127.0.0.1,2014-11-15 00:18:39,2014-11-15 04:18:39,"test comment",0,1,"user_agent","",0,657
comment_type is an empty field, third from last. I'll just tried adding "comment" there, no luck.
The review does show on the backend and the product page however, the product page says "Reviews (0)." The reviews are not being counted on the product page.
Would you please explain this to me?
meta_value in the postmeta table is type-agnostic. What that data represents depends on which plugin/function stored it and what it wants it to mean. You can store integers, dates, strings, or PHP data structures, WordPress does not care, and stores them all as strings internally. In your case, I'm guessing that 1 means the user is verified and 0, NULL or no row means the user isn't verified.
comment_type is similar to post_type. If you want to add a special kind of comment (a review in your case), you'll have to figure out what the software you are using expected as comment_type. Look at existing reviews, what do they have set as comment_type?
In order for the reviews to show the count, I had to navigate to comments, edit the comment, and update the comment (with no changed fields). Perhaps the HTTP server needed to be reloaded, or WooCommerce needs to be reloaded in some way.
I'm using wordpress with some custom fields, to cut this short, im echoing out all rows that have the meta_key of post_author that arent empty and grouping likewise names together otherwise i might get Pete, Steve, Pete - when all i need is Pete, Steve. Below is the SQL that makes that work
$wpAuthors = $wpdb->get_results($wpdb->prepare("SELECT DISTINCT(meta_value)
FROM $wpdb->postmeta WHERE meta_value !='' AND meta_key = 'post_author'
ORDER BY meta_key ASC"));
That works great. But what if i change the author FROM pete TO steve? Of course wordpress makes a duplicate entry for that post id, with a different Custom field row id. (Post ID on both rows would be something like 1100 while entry rows might be 3000 and 3001). Now the issue here is that my script still works, because both Pete and Steve are entered into the database in the correct column, but what i need it to do now is to select the most recent copy of that post id row to get the most recent author, does that make sense? I hope so!
define('WP_POST_REVISIONS', false); Add this variable in to wp-config.php, it will prevent wordpress to create post revisions.
After that install this plugin http://wordpress.org/plugins/wp-optimize/screenshots/.
Now remove all post revisions using above wp-optimize plugin.
I'm in the process of creating an application where we are fed several external product feeds daily, and we populate our products database with the feeds.
However the trick is we need to keep the product db in sync with the latest feed(s).
Previously I had toyed with the theory of populating the current product list from db in an array, and doing array comparison with the latest feed, that got gunned down once the product count was in the thousands. (Ran out of memory when trying to get a 5000 records).
So after abit of research, it seems the solution would probably lie on the SQL side, using TRIGGERS perhaps. Though I'm not quite sure how to go about it, hence my question.
So the 2 objectives I need to accomplish with the syncing process:
1) Insert new products that do not already exist in our db. We can accomplish this with the INSERT IGNORE method.
2) Find products on our DB that do NOT exist on the latest feed, and do something to them. (flag as deleted, or move to a deleted products table, etc.)
Step 2 is where I'm having trouble. I'm thinking now maybe for every sync operation, we insert the products from the latest feed into a 'Temp-Products' table, and somehow compare 'Products Table' with 'Temp-Products' table in finding the records that need to be flagged as deleted.
Any advice please?
Thanks
Obviously over-thought this one. The solution as suspected and further enforced by Anigel is to create a temporary table, 'products_temp' to store new feeds. We then run a simple join to find out what products are in the Products table, but not in 'products_temp', hence suggesting that the products have been sold out or deleted on the retailer.
We can then either flag the results of the query as deleted/sold out/do whatever.
The query I used is this:
SELECT products.sku_number, products_temp.sku_number FROM products LEFT OUTER JOIN products_temp ON products.`sku_number` = products_temp.`sku_number` WHERE products_temp.sku_number IS null
I want to take a snap shot of a row in a MySQL table.
The reason being, if someone buys a product. I want to take a snapshot of that product to store for the order.
It needs to be a snapshot to maintain data integrity. If I just assign the product to the order, if the product changes in the future the order will show those changes. For example if the price changes, the order will now load the new data and say that it sold the product at its new price rather than what the price was when the order was placed. So a snapshot needs to be assigned to the order instead.
The way I did this in the past was having 2 tables, one for products, and one for snapshots of products. The snapshot had every column as the regular table plus extra colums like order_id
I had a script to take a snapshot that automatically looked at the fields in the regular table and tried to do an insert into the same fields into the snapshot table.
The biggest problem with that approach is that, if I added a column to the regular table and forgot to add the same column to the snapshot table; the script would try to insert data into a non existent field and fail.
I also disliked the idea of having 2 tables that were nearly identical. I think maybe figuring out a way to use one table for both purposes might be better.
So I am wondering if there is a known method I am unaware of to solve this issue?
My previous project used no framework but my next one will be using CakePHP if that matters.
I think the best way of handling this would be to roll the "snapshot" information into an orders_products table. So if you have an order, store the total price, tax, etc. information in a single row on the orders table and reference that order_id on your orders_products table. On your orders_products table, you can have order_id, product_id, price, quantity, discount and whatever else you need.
Seems like your previous is fine. But that you just need to do more testing to ensure that you don't forget to add the new fields to the snapshot table. Seems like a basic test that would be easy to do. The other alternative is to just use a big text field, and store the snapshot as XML. This will let you store the snapshot regardless of if the schema changes. Depending on how much you want to query this data, it may or may not work for you.
Also you may not want to store every field, as it may just take up extra space. For instance, if you have the location of the image file of the item, you may not want to store that, as it may not be important at a later date. You could try querying information_schema to query which fields are in the snapshot table, and only copy the available fields.
i still , don't understand , how wordpress can understand what is this url refer to :
www.mysite.com/about-me/
they are using no identifier
if they using slug functions so how they can retain story information or in other word , how they change back the slugged title to select from database
It processes the "pretty" URL and queries the database with that data. Of course slugs are checked to be unique on creation. Details are in the function url_to_postid() in the file wp-includes/rewrite.php.
If you want to directly obtain the id from the slug you can query the database:
SELECT ID
FROM wp_posts
WHERE post_name = '$slug'
you might need to check wp_posts which is the default name, but it depends on the installation.
This is just a guess:
My guess is that they store the titles in a database, and make sure every title is unique. That way, they can do a look-up by title and know which item is coupled to that.