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merge image ID lists before scanning the images table, not after

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This commit is contained in:
Shish 2012-05-16 05:12:19 +01:00
parent f81fa08077
commit fd725d3363
1 changed files with 14 additions and 14 deletions
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28
core/imageboard.pack.php
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@ -613,6 +613,9 @@ class Image {
}
/**
* WARNING: this description is no longer accurate, though it does get across
* the general idea - the actual method has a few extra optimisiations
*
* "foo bar -baz user=foo" becomes
*
* SELECT * FROM images WHERE
@ -746,32 +749,29 @@ class Image {
$have_pos = count($positive_tag_id_array) > 0;
$have_neg = count($negative_tag_id_array) > 0;
$sql = "SELECT images.* FROM images WHERE ";
$sql = "SELECT images.* FROM images WHERE images.id IN (";
if($have_pos) {
$positive_tag_id_list = join(', ', $positive_tag_id_array);
$sql .= "
images.id IN (
SELECT image_id
FROM image_tags
WHERE tag_id IN ($positive_tag_id_list)
GROUP BY image_id
HAVING COUNT(image_id)>=$positive_tag_count
)
SELECT image_id
FROM image_tags
WHERE tag_id IN ($positive_tag_id_list)
GROUP BY image_id
HAVING COUNT(image_id)>=$positive_tag_count
";
}
if($have_pos && $have_neg) {
$sql .= " AND ";
$sql .= " EXCEPT ";
}
if($have_neg) {
$negative_tag_id_list = join(', ', $negative_tag_id_array);
$sql .= "
images.id NOT IN (
SELECT image_id
FROM image_tags
WHERE tag_id IN ($negative_tag_id_list)
)
SELECT image_id
FROM image_tags
WHERE tag_id IN ($negative_tag_id_list)
";
}
$sql .= ")";
$query = new Querylet($sql);
if(strlen($img_search->sql) > 0) {