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optimise counting number of results for one negative tag

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This commit is contained in:
Shish 2020-02-04 23:05:07 +00:00
parent 9216be3c96
commit aa5cf0e81b
1 changed files with 29 additions and 12 deletions
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41
core/imageboard/image.php
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@ -199,6 +199,26 @@ class Image
* Image-related utility functions
*/
public static function count_total_images(): int
{
global $cache, $database;
$total = $cache->get("image-count");
if (!$total) {
$total = (int)$database->get_one("SELECT COUNT(*) FROM images");
$cache->set("image-count", $total, 600);
}
return $total;
}
public static function count_tag(string $tag): int
{
global $database;
return (int)$database->get_one(
"SELECT count FROM tags WHERE LOWER(tag) = LOWER(:tag)",
["tag"=>$tag]
);
}
/**
* Count the number of image results for a given search
*
@ -211,22 +231,19 @@ class Image
if ($tag_count === 0) {
// total number of images in the DB
$total = $cache->get("image-count");
if (!$total) {
$total = (int)$database->get_one("SELECT COUNT(*) FROM images");
$cache->set("image-count", $total, 600);
}
$total = self::count_total_images();
} elseif ($tag_count === 1 && !preg_match("/[:=><\*\?]/", $tags[0])) {
// one tag - we can look that up directly
// TODO: one negative tag = (total - tag.count)
$total = (int)$database->get_one(
"SELECT count FROM tags WHERE LOWER(tag) = LOWER(:tag)",
["tag"=>$tags[0]]
);
if (!startsWith($tags[0], "-")) {
// one tag - we can look that up directly
$total = self::count_tag($tags[0]);
} else {
// one negative tag - subtract from the total
$total = self::count_total_images() - self::count_tag(substr($tags[0], 1));
}
} else {
// complex query
$total = $cache->get("image-count:" . Tag::implode($tags));
if(!$total) {
if (!$total) {
if (Extension::is_enabled(RatingsInfo::KEY)) {
$tags[] = "rating:*";
}