I would like to get all the the corresponding images from one mySQL table that have a corresponding post_ID to the ID of another table.
So with an ID of 7 in table wp_post, I want to echo the values of infomation in another table that has a certain meta_key and a corresponding ID.
===WP_POST=========== ===WP_POSTMETA======================================
ID || content post_id || meta_key || meta_value
================================================================================
The meta_key that I want is listed as _wp_attached_file in the database.
So I want to get all meta_values of wp_postmeta table that have a meta_key of _wp_attached_file and a post_id that matches the current ID of the page being viewed from the table wp_posts.
So obviously the tables will need to be joined but I need a hand.
Any ideas,
Marvellous AHAA
Implemented solution below and I am now receiving an error.
<?php
$pics = mysql_query("SELECT t2.meta_key,t2.meta_value from (select id from wp_post) t1
join wp_postmeta t2 on (t2.post_id=t1.postid)
where t2.meta_key='_wp_attached_file'");
while ($row = mysql_fetch_array($pics)) {
$thumb = $row['meta_value'];
echo '<img src="http://www.golfbrowser.com/wp-content/uploads/'.$thumb.'" />';
}
?>
Any ideas?
I tried a simpler way myself. Still does not work.Can anyone see what is wrong.
<?php
$post_id = $post->ID;
$pics = mysql_query("
SELECT meta_value * FROM wp_postdata
WHERE meta_key ='_wp_attached_file'
AND post_id = '%$post_id%'
");
while ($row = mysql_fetch_array($pics)) {
$thumb = $row['meta_value'];
echo '<img src="http://www.golfbrowser.com/wp-content/uploads/'.$thumb.'" />';
}
?>
Try this query:
SELECT A.meta_key
FROM WP_POSTMETA AS A
JOIN WP_POST AS B
ON (A.post_id = B.ID)
WHERE A.post_id='%post_id%' ;
Related
I have this code, that fetches data from two tables in MySQLi.
It first has to get the title, description, status and project_id from table 1, and then get the name from table 2 using the id from table 1.
Is there a better/faster way to do this? I have about 600 rows in the tables, and it takes about 5 sec to run this query. I will also add that this example is a bit simplified, so please don't comment on the db-structure.
<?php
$results = $connect()->db_connection->query(
'SELECT title, description, status, project_id
FROM table
WHERE created_by ='.$user_id
);
if ($results) {
while ($result = $results->fetch_object()) {
$res = $connect()->db_connection->query(
"SELECT name FROM projects WHERE id = ".$result->project_id
);
if ($res) {
while ($r = $res->fetch_object()) {
echo $r->name;
}
}
echo $result->title;
echo $result->status;
}
}
?>
Use Query:
SELECT title,description,status,project_id
FROM table tb
inner join projects pr on pr.id = tb.project_id
WHERE created_by = $user_id
Try to use JOIN in your query.
You can find examples and description of this command here: http://www.w3schools.com/sql/sql_join.asp
Check out also this infographics:
http://www.codeproject.com/KB/database/Visual_SQL_Joins/Visual_SQL_JOINS_orig.jpg
You can use JOIN on project_id:
$results = $connect()->db_connection->query('SELECT t.title title,t.description,t.status status,t.project_id, p.name name FROM `table` t JOIN projects p ON p.id= t.project_id WHERE t.created_by ='.$user_id);
if($results){
while($result = $results->fetch_object()){
echo $result->name;
echo $result->title;
echo $result->status;
}
}
tables have aliases here - t for table and p for projects.
Also to make it faster, add index to project_id in table table, if you haven't done it yet:
$connect()->db_connection->query('ALTER TABLE `table` ADD INDEX `product_id`');
I wonder if there is a way of merging these two database queries so as to have one:
$result = $wpdb->get_row("SELECT meta_value FROM ".$wpdb->prefix.
"postmeta WHERE meta_key = '_cat_num' AND post_id = $var");
$name = $wpdb->get_row("SELECT name FROM ".AH_FEED_DETAILS_TABLE.
" WHERE id = " . (int)$result->meta_value);
return $name->name;
The first query finds the category value which is then used to find the name field in the AH_FEED_DETAILS_TABLE table
You can get the database to do the work for this by using the IN with a sub-query as follows:
$name = $wpdb->get_row("SELECT name FROM ".AH_FEED_DETAILS_TABLE.
" WHERE id IN (SELECT meta_value FROM ".$wpdb->prefix.
"postmeta WHERE meta_key = '_cat_num' AND post_id = $var)");
$result = $wpdb->get_row("SELECT name FROM ".$wpdb->prefix
.AH_FEED_DETAILS_TABLE." AS cat_tbl JOIN postmeta ON
cat_tbl.id=postmeta.meta_value
WHERE postmeta.meta_key = '_cat_num' AND postmeta.post_id = $var");
return $result->name;
I hope that helps giving the idea
Trying to write an SQL function that collects data from two different tables. It should get the current post id from wp_posts and then find the corresponding images from a table called wp_postdata.
Table 1
------------------------------
id || title || content
------------------------------
Table 2
---------------------------------------------------------
meta_id || post_id || meta_key || meta_value
---------------------------------------------------------
The meta_key that we are after is called _wp_attachment_metadata
My failed attempt ::
<?php
$pics = mysql_query("SELECT id,
meta_key_wp_attached_file.meta_value picture
FROM wp_posts
LEFT JOIN wp_postmeta meta_key_wp_attached_file
ON meta_key_wp_attached_file.post_id = wp_posts.id
WHERE meta_key_wp_attached_file.meta_key = 'picture'
ORDER BY picture;");
while ($row = mysql_fetch_array($pics)) {
$thumb = $row['picture'];
echo '<img src="http://www.golfbrowser.com/wp-content/uploads/'.$thumb.'" />';
}
?>
Any ideas,
Marvellous
Should be: meta_key = '_wp_attachment_metadata', and you'll need to unserialize the result.
Or you can use the API:
http://codex.wordpress.org/Function_Reference/WP_Query
http://codex.wordpress.org/Function_Reference/get_post_meta
I have this query:
$query = "SELECT *FROM wp_postmeta WHERE meta_key = '_isEvent' AND meta_value ='yes' ORDER BY post_id LIMIT 0, 5" or die(mysql_error());
$result = mysql_query($query) or die(mysql_error());
while ($row = mysql_fetch_array($result)) {
$eventid = $row ['post_id'];
echo "<p>".$eventid."</p>";
}
This currently posts some ids $eventid. I now want to run another query in another table (same database) that pulls some post titles that matches those id's.
Table is called "wp_posts" and column to match is "ID" and want to echo out post title from "post_title".
Where do I start?
Sounds like you want to use SQL joins. W3 schools has a good intro article about this.
http://www.w3schools.com/sql/sql_join.asp
Something like the following
SELECT post_title FROM wp_postmeta m, wp_posts p WHERE m.wmeta_key = '_isEvent' AND m.meta_value ='yes' AND m.post_id == p.post_idORDER BY m.post_id LIMIT 0, 5
I have the following table:
Comments
--------
id PK
cid
content
uid
comment
If the content is image /i want it to print ?imgID=$cid and get the data from the row title from the table images and if it's a thread I want it to print ?threadID=$cid and get the title from the table threads and so on. How should I do this?
<h3>Latest comments</h3>
<?php
$rs = mysql_query("
SELECT *
FROM comments
LEFT JOIN threads
ON threads.id = comments.cid
WHERE comments.uid = $id
");
while ($row = mysql_fetch_assoc($rs)) {
echo $row['title'];
}
while ($row = mysql_fetch_assoc($rs)) {
if($row['content'] == "image") {
echo "?imgID={$cid}";
$title = mysql_fetch_assoc(mysql_query("SELECT title from images WHERE id = '$cid'");
} elseif ($row['content'] == "thread") {
echo "?threadID={$cid}";
$title = $row['title']; // Will only work as long as there is no title field in comments, oherwise use threads.title
}
}
echo $title;
There you go. The curly brackets around the $cid aren't strictly nessecary, but they help avoid issues where if you are trying to print text afterwards, and it reads the variable name as something else.
$q="SELECT c.id, c.cid, c.content, c.uid, c.comment,
COALESCE(t.title,i.title) AS the_title
FROM comments c LEFT JOIN threads t ON (c.cid=t.id AND c.content='thread')
LEFT JOIN images i ON (c.cid=i.id AND c.content='image');
The above combines your two queries together and puts the title attribute in one column.