I know I'm probably doing this in a round about fashion but I don't understand why it wont work or a better way to just retrieve ONLY THE STRING VALUES in an array so that I can move them to a different table. I thought I could iterate through the array list and output only the strings in the array but it is not working :(
//database config and wpdb access code...
<?php
$cbposttitles = $wpdb->get_col('SELECT post_title FROM wp_posts' );
$countofposttitles = count($cbposttitles);
echo "count of post tiles . $countofposttitles"; //counts correctly
?>
<br>
<?php
for ($x = 0; $x < $countofposttitles; $x++) {
$individualpost = $wpdb->get_var('SELECT post_content FROM wp_posts WHERE ID =
[$x]');
echo $individualpost; // does't work
}
?>
$countofposttitles contains nothing but the number of posts/titles. This you have no use for in your piece code. You probably try to select some kind of ids from your first query and look for each of these in your second. However, this is very inefficient since you're making a lot of unnecessary database requests.
Which strings and/or values to you actually want and what is the purpose? You're using two queries for the same table, either you want both fields or just one? If you want both fields then just select both in one query:
SELECT post_title, post_content FROM wp_posts
Related
I have been trying to get data from exploded values, but I am failing miserably and I am completely clueless despite all the researching I've been doing.
This is how the code looks like:
$array = explode(",", $hos['prop_owner']);
list($a) = $array;
$gu = $db->prepare("SELECT * FROM users WHERE user_id = :id");
$gu->execute(array(':id' => $a));
$dau = $gu->fetch();
echo $hos['prop_name']."<br><small>";
if(end($array)){
echo "<a href='/user/view/".$dau['user_id']."' style='color:#".$dau['user_colour']."'>".$dau['user_name']."</a></small><br>";
} else {
echo "<a href='/user/view/".$dau['user_id']."' style='color:#".$dau['user_colour']."'>".$dau['user_name']."</a>,";
}
Currently, the database field $hos['prop_owner'] contains the values "2,20" which are IDs of users (this field can potentially contain more IDs in the future). What I want to do is get all the user data from the exploded values, in this case 2 and 20, and then echo the information out in order as well.
Re-explanation:
I have a field in my database called prop_owner which is supposed to contain an unlimited number of user IDs, seperated by comma. Format: 1,2,3,4.
I want to take the value from this field, then somehow separate the user IDs and separately retrieve the usernames and echo them out.
Example result: Darren, Eva, Miles, Lisbeth
I hope I explained myself good enough to understand where I am trying to go with this.
Thanks in advance!
First of all the query will be like
SELECT * FROM users WHERE user_id in (2,20)
You need the data of both the users so the query will return all the data of all the ids that are being passed here..
You can directly pass here but you need to take care of security... or may be you can check how to pass values securely in such queries ...
I have this code:
<?php
$data = mysql_query("SELECT * FROM repin WHERE new_pin_id LIKE ".$pinDetails->id) or die(mysql_error());
while($info = mysql_fetch_array( $data ))
{
Print "".$info['from_pin_id'].",".$info['new_pin_id']."";
}
?>
Obtained thanks to this article: Check field for identical number
I'm trying to use the detail I pulled: ".$info['from_pin_id']." to get data from another table. I'm looking for the best way to do this.
I thought about making it a variable and then running a second statement within the same <?php?> which would look something like this:
Print "".$info['from_pin_id'].",".$info['new_pin_id']."";
}
$newdata = "".$info['from_pin_id']."";
// new statement here.
?>
But 1. it won't work and 2. it looks messy.
What is the best way to achieve it?
FYI, what I need to do is use ".$info['from_pin_id']." to match a field in another table where the data is the same ID, then pull more info based on the match.
Use the following query:
"SELECT *
FROM repin r
LEFT JOIN otherTable o
ON o.someColumn = r.from_pin_id
WHERE r.new_pin_id LIKE '".$pinDetails->id."'"
Also, the argument to LIKE must be a string; you need to put quotes around it.
This question already has answers here:
Closed 10 years ago.
Possible Duplicate:
Is it possible to query a tree structure table in MySQL in a single query, to any depth?
I have an admin area I created that pulls data from the mysql database using php and display the results in a table. Basically it shows a parent category, then the first sub category below it, then the third level sub category/subject.
It works perfectly but as I am new to mysql and php I am sure that it the code needs to be improved in order to save db resources as while building the table I use 3 while loops and in each loop make a mysql query which I am sure is the wrong way to do it.
Can somebody offer me some assistance for the best way of doing this?
Here is the code:
$query = mysql_query("SELECT * FROM categories WHERE
parent_id is null
order by cat_id asc;", $hd)
or die ("Unable to run query");
while ($row = mysql_fetch_assoc($query)) {
echo '<tr style="font-weight:bold;color:green;"><td>'. $row ['cat_id'].'</td><td>'.$row['cat_name'].'</td><td>'.$row ['parent_id'].'</td><td>'.$row['active'].'</td><td>'.$row ['url'].'</td><td>'.$row['date_updated'].'</td></tr>' ;
$query2 = mysql_query("SELECT * FROM categories WHERE
(active = 'true' AND parent_id = ".$row ['cat_id'].")
order by cat_id asc;", $hd)
or die ("Unable to run query");
while ($row2 = mysql_fetch_assoc($query2)) {
echo '<tr style="font-weight:bold;"><td>'. $row2['cat_id'].'</td><td>'.$row2 ['cat_name'].'</td><td>'.$row2['parent_id'].'</td><td>'.$row2 ['active'].'</td><td>'.$row2['url'].'</td><td>'.$row2 ['date_updated'].'</td></tr>' ;
$query3 = mysql_query("SELECT * FROM categories WHERE
(active = 'true' AND parent_id = ".$row2 ['cat_id'].")
order by cat_id asc;", $hd)
or die ("Unable to run query");
while ($row3 = mysql_fetch_assoc($query3)) {
echo '<tr><td>'. $row3['cat_id'].'</td><td>'.$row3['cat_name'].'</td><td>'.$row3 ['parent_id'].'</td><td>'.$row3['active'].'</td><td>'.$row3 ['url'].'</td><td>'.$row3['date_updated'].'</td></tr>' ;
}
}
}
EDIT
Ok so I did a bit of research and this is where I am:
Probably for a small database my approach is fine.
For a bigger database using an array to store the data would probably mean I need to use a recursive approach which might use up too much memory. Would love to hear what people think, would it still be better than looping db queries in the nested while loops?
I found the following thread where there is an answer to do this without reccursion and with only one query. Not sure if I need to add a position column to my current design:
How to build unlimited level of menu through PHP and mysql
If I rebuild the design using the nested sets model instead of adjacency model then the mysql query would return the results in the required order however maintaining the nested sets design is above my head and I think would be overkill.
That's it. If anyone has any input on top of that please add to the conversation. There must be a winning approach as this kind of requirement must be needed for loads of web applications.
I would think you could do something like this:
SELECT * FROM categories
WHERE active = 'true'
ORDER BY parent_id, cat_id
This would give you all your categories ordered by parent_id, then by cat_id. You would then take the result set and build a multi-dimensional array from it. You could then loop through this array much as you currently do in order to output the categories.
While this is better from a DB access standpoint, it would also consume more memory as you need to keep this larger array in memory. So it really is a trade-off that you need to consider.
There is a lot to fix there, but I'll just address your question about reducing queries. I suggest getting rid of the WHERE clauses all together and use if statements within the while loop. Use external variables to hold all the results that match a particular condition, then echo them all at once after the loop. Something like this (I put a bunch of your stuff in variables for brevity)
//before loop
$firstInfoSet = '';
$secondInfoSet = '';
$thirdInfoSet = '';
//in while loop
if($parentID == NULL)
{
$firstInfoSet.= $yourFirstLineOfHtml;
}
if($active && $parentID == $catID) // good for query 2 and 3 as they are identical
{
$secondInfoSet.= $yourSecondLineOfHtml;
$thirdInfoSet.= $yourThirdLineOfHtml;
}
//after loop
echo $firstInfoSet . $secondInfoSet . $thirdInfoSet;
You can now make whatever kinds of groupings you want, easily modify them if need be, and put the results wherever you want.
--EDIT--
After better understanding the question...
$query = mysql_query("SELECT * FROM categories order by cat_id asc;", $hd);
$while ($row = mysql_fetch_assoc($query)){
if($row['parent_id'] == NULL){
//echo out your desired html from your first query
}
if($row['active'] && $row['parent_id']== $row['cat_id']){
//echo out your desired html from your 2nd and 3rd queries
}
}
I have a form where I am trying to implement a tag system.
It is just an:
<input type="text"/>
with values separated by commas.
e.g. "John,Mary,Ben,Steven,George"
(The list can be as long as the user wants it to be.)
I want to take that list and insert it into my database as an array (where users can add more tags later if they want). I suppose it doesn't have to be an array, that is just what seems will work best.
So, my question is how to take that list, turn it into an array, echo the array (values separated by commas), add more values later, and make the array searchable for other users. I know this question seems elementary, but no matter how much reading I do, I just can't seem to wrap my brain around how it all works. Once I think I have it figured out, something goes wrong. A simple example would be really appreciated. Thanks!
Here's what I got so far:
$DBCONNECT
$artisttags = $info['artisttags'];
$full_name = $info['full_name'];
$tel = $info['tel'];
$mainint = $info['maininst'];
if(isset($_POST['submit'])) {
$tags = $_POST['tags'];
if($artisttags == NULL) {
$artisttagsarray = array($full_name, $tel, $maininst);
array_push($artisttagsarray,$tags);
mysql_query("UPDATE users SET artisttags='$artisttagsarray' WHERE id='$id'");
print_r($artisttagsarray); //to see if I did it right
die();
} else {
array_push($artisttags,$tags);
mysql_query("UPDATE users SET artisttags='$artisttags' WHERE id='$id'");
echo $tags;
echo " <br/>";
echo $artisttags;
die();
}
}
Create a new table, let's call it "tags":
tags
- userid
- artisttag
Each user may have multiple rows in this table (with one different tag on each row). When querying you use a JOIN operation to combine the two tables. For example:
SELECT username, artisttag
FROM users, tags
WHERE users.userid = tags.userid
AND users.userid = 4711
This will give you all information about the user with id 4711.
Relational database systems are built for this type of work so it will not waste space and performance. In fact, this is the optimal way of doing it if you want to be able to search the tags.
I'm using WordPress, but this question is more pertaining to the SQL involved. I'll gladly move it if I need to.
I'm working on http://www.libertyguide.com/jobs and I'm trying to alter the filtering mechanics. Currently it's a global OR query.
Anyways, I have three filtering lists, and I'm storing what's selected into three strings (interests, type, experience) in the following way:
"( $wpdb->terms.slug = 'webdevelopment' OR $wpdb->terms.slug = 'journalism' OR ... ) AND"
It's populated by whatever is selected in my filtering lists.
When it comes down to it, I have this as a basic query (I'm leaving out the LEFT JOINS):
Before:
SELECT * FROM $wpdb->posts WHERE ($wpdb->terms.slug = 'fromlist1'
OR $wpdb->terms.slug = 'fromlist2' OR $wpdb->terms.slug = 'fromlist3')
AND $wpdb->term_taxonomy.taxonomy = 'jobtype'...
After:
SELECT * FROM $wpdb->posts WHERE
($wpdb->terms.slug = 'fromlist1' OR $wpdb->terms.slug = 'fromlist1again')
AND ($wpdb->terms.slug = 'fromlist2' OR $wpdb->terms.slug = 'fromlist2again')
AND ($wpdb->terms.slug = 'fromlist3' OR $wpdb->terms.slug = 'fromlist3again')
AND $wpdb->term_taxonomy.taxonomy = 'jobtype'...
So essentially I want to go from an
OR filter
to
an AND filter with OR filtering inbetween.
My new filtering only works when one item overall is selected, but returns nothing when I select more than one thing (that I know would match up with a few posts).
I've thought through the logic and I don't see anything wrong with it. I know nothing is wrong with anything else, so it has to be the query itself.
Any step in the right direction would be greatly appreciated. Thanks!
UPDATE
From the confusion, basically I have this:
"SELECT ...... WHERE $terms ..."
but I WANT
"SELECT ....... WHERE $interests AND $type AND $experience"
I don't want to have it filter $interest[1] OR $interest[2] OR $type[1] OR $experience[1], but instead want it to filter ($interest[1] OR $interest[2]) AND ($type[1]) AND ($experience[1])
I hope this makes more sense
*UPDATE 2*
Here's and example:
In my interests list, I select for example three things: WebDevelopment, Academia, Journalism.
In my type list, I choose two things: Fulltime, Parttime
In my experience list, I choose three things: Earlycareer, Midcareer, Latecareer.
When I run my query, I want to make sure that each record has AT LEAST one of each of the three lists. Possible Results: (WebDevelopment, Parttime, Midcareer), (Academia, Fulltime, Earlycareer, Midcareer).
NOT A RESULT: (Journalism, Earlycareer) - missing fulltime or parttime
I really hope this clears it up more. I'm willing to give compensation if I can get this working correctly.
Okay, I'll take a shot at this:
SELECT * FROM $wpdb->posts WHERE
(
$wpdb->terms.slug IN ('$interest1', '$interest2') AND
$wpdb->terms.slug IN ('$type1', '$type2') AND
$wpdb->terms.slug IN ('$exp1', '$exp2')
)
AND $wpdb->term_taxonomy.taxonomy = 'jobtype'
The IN keyword will return true if any member of the set matches.
I think you're looking for a WHERE category IN (comma, seperated, list, of, values) that you can generate dynamically from the form. If you combine it with the other categories, you can require them to select something from each with...
WHERE category1 IN (a, comma, seperated, list, of, values)
AND category2 IN (another, list, of, values)
AND ...
Which will only return a value if there is something selected from each category and will return nothing if any of the selection lists are empty; actually it may well kick out an error, so I would also generate the query dynamically if there is any content whatsoever for a given category.
if (!empty($arrayOfCategory1)) {
//sanitize input logic here
$Category[1] = 'category1 IN ('. implode(', ', $arrayOfCategory1) .')';
} else {
$Category[1] = '';
}
You concatenate the resultant string together and build the query with that. The WHERE 1=1 trick is problematic because if nothing is chosen, everything in the database will match, so I strongly recommend going through the process of adding the AND operators properly.
EDIT: it occurs to me that if you build the conditional statements as an array, you can implode those with ' AND ' and get the query in a fairly small number of lines of code.
Sort of confused a bit by what you are saying but if I wanted to build a filter I would be dynamically generating the SQL query based on the submitted filter values. Something like:
$sql = "SELECT * FROM $wpdb->posts WHERE 1=1";
if ( !empty($interest) ) { // they ticked the interested in ??? checkbox
$sql .= " AND $wpdb->terms.slug = $interest"
}
Obviously you will need to filter and escape any values that have been submitted.