Good morning, I would like to create a list of content by ordering them from the most visited one.
I have a table called "post", formed by these different fields:
ID
TITLE
VIEWS
I would therefore like the content list to be shown from the post with the largest views.
I did this:
$pdo->query('SELECT * FROM post ORDER BY views DESC');
But unfortunately it does not work properly, and I do not understand why. It sounds casual, sometimes it shows at the top of the post with fewer views than others, let's say everything randomly, otherwise it's correct. Something wrong?
If your views field is a varchar and you want to sort the values as a number so use ABS of MySQL
$pdo->query('SELECT * FROM post ORDER BY ABS(views) DESC');
Related
I am learning PHP and have decided to code my own OOP MVC framework. Now, I have realized several times already that it might not be the smartest move but I mean to see this out to the end. And then onwards...
My issue is creating a listing sidebar based on categories and a second based on year-month-postname.
I am officially stuck on the first one, let alone the second damn option. I have included some code and description of what I have tried. The lack of OOP info on the net is daunting or maybe it is because I am searching for the wrong thing, I dont know. But the tutorials have not given me any insight as to how to actually do this in a way where my database is in a model file and my class logic is in the class file.
Sorting logic should be like this Array-Object-Propertyname-Value.
The value, as I hope is easy to understand in my example below, is the category name eg Javascript, PHP, HTML. By that category i wish to sort my blog posts. But not in the way that requires me to manually input the category names to the code. I want to allow users to enter categories if they so choose.
I also wish to display the blog posts inside said category, lets say 5 most recent. But that should not be too hard with a
for($i=0,$i<5,i++)
nested inside whatever solution in the end will work for the category sort.
I have tried MySQLI procedural solutions ranging from multiple google searches and tutorials. Can do it, but dont want to do it procedurally. Tried foreach loop and nesting multiple foreach loops - simply cannot get either the problem of having duplicates based on the shared category name or if trying to group in the SQL query, it simply groups results with same category and then displays only the first one in the group. While loops with mysqli procedural work but with pdo in my case they produce infinite loops, no matter the condition I try to set.
So foreach is the way to go I believe. I have read up on loops and array sorting but I've yet to find a solution. I thought of sorting by key because that is what i need but to no applicable solutions.
It's easy to display the category names and dates and all that. But with category I always get duplicates.
Ive tried some logic where as to assign category names as variables but only to have them all be different variables, meaning still having duplicates or only rewriting the variable with each iteration.
Also, array sorts havent worked because I havent gotten any to work with sorting either on property or if converting Objects to a multidimensional array. Granted that may be because I am a beginner and not understood the syntax but I am not going to post them all here I think.
If you think an array sorting function will do the trick then perhaps give me an example and I will look into it with some new perspective hopefully.
PDO query :
'SELECT * FROM postTable
INNER JOIN userTable ON postTable.postUserId = userTable.id
INNER JOIN postCategories ON postTable.postCategoryId = postCategories.categoryName
ORDER BY postTable.postDate DESC'
Tried also to add
GROUP BY categoryName
but that resulted in only one entry per category shown when using var_dump. Sidenote - same is when grouping by creation date. Is there another layer added to the array when using group in the SQL command and I missed that in the docs?
PDO returns to view file :
$this->stmt->fetchAll(PDO::FETCH_OBJ);
this all gets passed into an array of
$results
and then that is sent to the php on the view page where the resulting array has this structure with var_dump.
array() {
[0]=>
object(stdClass)# () {
["categoryName"]=>
string() "Help"
}
[1]=>
object(stdClass)# () {
["categoryName"]=>
string() "Me"
}
and so on.
Note - also tried using -
fetchAll(PDO::FETCH_ASSOC);
But ive had similar failures with attempting any sorting or limiting to just one category name displayed but all entries under said category being displayed correctly and not just one per category.
I will be checking back when i finish work tomorrow so in about 20-22 hours from the time of posting.
If you need any more info just let me know and I'll post it.
You can order by multiple columns. Use:
ORDER BY categoryName, postDate DESC
This will keep all the posts in the same category together, and in decreasing date order within each category.
See How can i list has same id data with while loop in PHP? for how you can output the results, showing a heading for each category.
If you just want to get the 5 latest posts in each category, see Using LIMIT within GROUP BY to get N results per group?
I am trying to sort the information given to me by the API of an engineering journal. I have extracted the following information into a table:
ID (integer),
Journal Entry Name (Text),
Description (Text),
Page Length (integer),
Has Media (boolean)
Each "Journal Entry" has only one ID associated with it. Each ID also has other characteristics that are not returned by the API but that I want to use to sort. They are:
Category (Things like Econ, Math, Biology. Each ID can have more than one category)
Boolean values (Things like requiring special subscriptions)
I have created a second table in the following format:
ID (integer),
Category (text),
Boolean1 (bool),
Boolean2 (bool),
Boolean3 (bool)
Since each ID can have more than one category, when this occurs another row is added to this table. The idea being that any given row only has one ID and one category in it.
What I want to do is this:
Be able to find the top ten categories when it comes to
Highest Journal Entry (ID) count
Highest Total Page Length
Highest Journal Entry count where the "Has Media" boolean is true
Create a means of navigating like "pagination" where each page shows the nth results of the aforementioned top ten.
So if I chose to Highest Journal Entry count method, the first page would be show IDs, Names, and Descriptions of all the Journal entries in the category with the highest count.
My plan has been to create a new table where the numbers one through ten are in the first column, and then populate the second column with the top ten categories. Then I can use a process similar to pagination in which the nth page only shows the values with the corresponding category from the original value. However I can't seem to be able to make this top ten list/matrix, nor do I know if it there is a better way.
Unfortunately I am not a MySQL or PHP coder by trade, and have only gotten this far by lots and lots of googling. I have been completely unable to find any guides for a navigation method like the one I want. And since I don't know the proper terminology, I am just trying random google searches at this point.
Is this the best way to go about it? Or would it be better to create a third table of some sort? Is there perhaps an easier way to do this with something that can use the PHP and MySQL code I already wrote?
Not sure I really understand what you're going for here, but my best guess is that you probably want to combine your two initial tables and have category be a set rather than an individual term so you can have a single entry per unique ID.
Then you'd just need to write calls for each of your top ten finds as needed. Since each id can have an unknown number of categories I would start with a limit of 10 and then process the returns starting with the top match, grab its categories, if there are more than 10 grab the first 10, if there are less than 10 grab what there are, update the amount you're looking for (if there were 4 then you're now looking for 6), and move on to the next best match.
Maybe something like this:
categories = null;
$delimeter = ',';
$count = 1;
$top10 = array();
$result = mysql_query("
SELECT *
FROM table_name
ORDER BY page_length DESC
LIMIT 10");
while($row = mysql_fetch_array($result) && $count <=10)
{
$categories = $row['categories'];
$id = $row['id'];
$splitcontents = explode($delimeter, $catagories);
foreach($splitcontents as $category){
if (!in_array($catagory,$top10)){
$top10[$count] = array(
'category'=>$category,
'journal_id'=>$id
);
$count++;
}
}
}
I have single table where i put all the content. Each row is one post. I want to be able to manipulate order of posts so that i can push some of those to the top or bottom...
Also, each post belongs to certain category. (i believe that that additional parameter makes difference when ordering posts within certain category)
Please, give me some hints/code patterns how would you do it?
p.s. i don't want to add new tables, make more relations, i want it as simple as possible...
I would personally accomplish this by adding a sort_index field to the table with a default value of something like 100. You can then push posts down by decreasing their sort order, or push them to the top by increasing it. By starting with a specific number, you are establishing a baseline for default sorting of posts.
SELECT * FROM `posts` ORDER BY sort_index DESC, date_posted DESC
This would use ensure posts with the same sort index get a secondary sorting based on the date they were posted.
It also allows you to then easily automate making the posts fall down in the rankings over time with a small script setup as a cron to decrease the sort index of posts every so often until they hit the default value.
Let's say you have a table with the following columns:
id
post
category
You can add a new integer column called rank. Using the new rank column you can order your posts like this:
SELECT `post` from tblPosts order by category, rank;
Now you can order your posts by assigning a rank to them. In the above example smaller numbers will be listed at the top and larger ones at the bottom.
I have mysql_query problem in php. Of course I have visitors in my website and they read football news there. The problem is that I try to sort news by views DESCending, but it doesn't work for new uploaded news. Somehow it appears at the end of the page. I've figured out one more thing that when views of the news is 9 it appears at the beginning of the page, but if it is more than 9 it appears at the end of the page. I'd appreciate any kind of help. Here is mysql_query.
mysql_query("SELECT * FROM news ORDER BY views DESC");
Oh and by the way, my website is http://www.bbcsport-football.com/football
there you can find Sorting options, New and Most Viewed. Click most viewed and you'll see it.
You need to convert the views column to a number
mysql_query("SELECT * FROM news ORDER BY cast(views as INTEGER) DESC")
Or even better change the table definition so views is a INTEGER
You're sorting the news by the count of "views", if I'm right, views is the count of users that already have read the page right? Try sorting it by the publication date instead, like:
"SELECT * FROM news ORDER BY pub_date DESC"
your code seems to be o.k to me... just check this query in your phpmyadmin database and check results what you get manually.
i see your URL and it looks o.k as per order by view. but one thing i notice is your pagination.
when i click pagination (page 2) from most viewed. it will automatically redirected to the first page of new. hope this little testing will help you in your website.. :)
I'm trying to create a web index. Every advertiser in my database will be able to appear on a few categories, so I've added a categorys column, and in that column I'll store the categories separated by "," so it will look like:
1,3,5
The problem is that I have no idea how I'm supposed to select all of the advertisers in a certain category, like: mysql_query("SELECT * FROM advertisers WHERE category = ??");
If categories is another database table, you shouldn't use a plain-text field like that. Create a "pivot table" for the purpose, something like advertisers_categories that links the two tables together. With setup, you could do a query like:
SELECT A.* FROM advertisers AS A
JOIN advertisers_categories AS AC ON AC.advertiser_id = A.id
WHERE AC.category_id = 12;
The schema of advertisers_categories would look something like this:
# advertisers_categories
# --> id INT
# --> advertiser_id INT
# --> category_id INT
You should design your database in another way. Take a look at Atomicity.
Short: You should not store your value in the form of 1,3,5.
I won't give you an answer because if you starting you use it this way now, you going to run into much more severe problems later. No offense :)
It's not possible having comma-separated values to do this strictly in an SQL query. You could return every row and have a PHP script which goes through each row, using explode($row,',') and then if(in_array($exploded_row,'CATEGORY')) to check for the existence of the category.
The more common solution is to restructure your database. You're thinking too two-dimensionally. You're looking for the Many to Many Data Model
advertisers
-----------
id
name
etc.
categories
----------
id
name
etc.
ad_cat
------
advertiser_id
category_id
So ad_cat will have at least one (usually more) entry per advertiser and at least one (usually more) entry per category, and every entry in ad_cat will link one advertiser to one category.
The SQL query then involves grabbing every line from ad_cat with the desired category_id(s) and searching for an advertiser whose id is in the resulting query's output.
Your implementation as-is will make it difficult and taxing on your server's resources to do what you want.
I'd recommend creating a table that relates advertisers to categories and then querying on that table given a category id value to obtain the advertisers that are in that category.
That is a very wrong way to define categories, because your array of values cannot be normalized.
Instead, define another table called CATEGORIES, and use a JOIN-table to match CATEGORIES with ADVERTIZERS.
Only then you will be able to properly select it.
Hope this helps!