ugly mysql thing from 2.3
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Shish
parent
fec1c016c4
commit
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1 changed files with 158 additions and 0 deletions
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@ -323,6 +323,15 @@ class Image {
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}
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}
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private static function build_search_querylet(Config $config, Database $database, $terms) {
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private static function build_search_querylet(Config $config, Database $database, $terms) {
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if($database->engine->name == "mysql")
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return Image::build_ugly_search_querylet($config, $database, $terms);
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else
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return Image::build_accurate_search_querylet($config, $database, $terms);
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}
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// this method is simple, fast and accurate; but mysql chokes on it
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// because it uses subqueries
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private static function build_accurate_search_querylet(Config $config, Database $database, $terms) {
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$tag_querylets = array();
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$tag_querylets = array();
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$img_querylets = array();
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$img_querylets = array();
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$positive_tag_count = 0;
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$positive_tag_count = 0;
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@ -472,6 +481,155 @@ class Image {
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return $query;
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return $query;
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}
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}
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// this function exists because mysql is a turd.
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private static function build_ugly_search_querylet(Config $config, Database $database, $terms) {
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$tag_querylets = array();
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$img_querylets = array();
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$positive_tag_count = 0;
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$negative_tag_count = 0;
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$stpe = new SearchTermParseEvent(null, $terms);
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send_event($stpe);
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if($stpe->is_querylet_set()) {
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foreach($stpe->get_querylets() as $querylet) {
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$img_querylets[] = new ImgQuerylet($querylet, true);
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}
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}
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// turn each term into a specific type of querylet
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foreach($terms as $term) {
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$negative = false;
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if((strlen($term) > 0) && ($term[0] == '-')) {
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$negative = true;
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$term = substr($term, 1);
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}
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$term = Tag::resolve_alias($term);
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$stpe = new SearchTermParseEvent($term, $terms);
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send_event($stpe);
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if($stpe->is_querylet_set()) {
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foreach($stpe->get_querylets() as $querylet) {
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$img_querylets[] = new ImgQuerylet($querylet, !$negative);
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}
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}
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else {
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$term = str_replace("*", "%", $term);
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$term = str_replace("?", "_", $term);
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if(!preg_match("/^[%_]+$/", $term)) {
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$tag_querylets[] = new TagQuerylet($term, !$negative);
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}
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}
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}
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// merge all the tag querylets into one generic one
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$sql = "0";
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$terms = array();
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foreach($tag_querylets as $tq) {
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$sign = $tq->positive ? "+" : "-";
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$sql .= " $sign (tag LIKE ?)";
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$terms[] = $tq->tag;
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if($sign == "+") $positive_tag_count++;
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else $negative_tag_count++;
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}
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$tag_search = new Querylet($sql, $terms);
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// merge all the image metadata searches into one generic querylet
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$n = 0;
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$sql = "";
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$terms = array();
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foreach($img_querylets as $iq) {
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if($n++ > 0) $sql .= " AND";
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if(!$iq->positive) $sql .= " NOT";
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$sql .= " (" . $iq->qlet->sql . ")";
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$terms = array_merge($terms, $iq->qlet->variables);
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}
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$img_search = new Querylet($sql, $terms);
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// no tags, do a simple search (+image metadata if we have any)
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if($positive_tag_count + $negative_tag_count == 0) {
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$query = new Querylet("SELECT images.*,UNIX_TIMESTAMP(posted) AS posted_timestamp FROM images ");
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if(strlen($img_search->sql) > 0) {
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$query->append_sql(" WHERE ");
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$query->append($img_search);
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}
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}
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// one positive tag (a common case), do an optimised search
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else if($positive_tag_count == 1 && $negative_tag_count == 0) {
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$query = new Querylet(
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// MySQL is braindead, and does a full table scan on images, running the subquery once for each row -_-
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// "{$this->get_images} WHERE images.id IN (SELECT image_id FROM tags WHERE tag LIKE ?) ",
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"
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SELECT images.*, UNIX_TIMESTAMP(posted) AS posted_timestamp
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FROM tags, image_tags, images
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WHERE
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tag LIKE ?
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AND tags.id = image_tags.tag_id
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AND image_tags.image_id = images.id
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",
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$tag_search->variables);
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if(strlen($img_search->sql) > 0) {
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$query->append_sql(" AND ");
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$query->append($img_search);
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}
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}
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// more than one positive tag, or more than zero negative tags
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else {
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$s_tag_array = array_map("sql_escape", $tag_search->variables);
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$s_tag_list = join(', ', $s_tag_array);
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$tag_id_array = array();
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$tags_ok = true;
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foreach($tag_search->variables as $tag) {
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$tag_ids = $database->db->GetCol("SELECT id FROM tags WHERE tag LIKE ?", array($tag));
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$tag_id_array = array_merge($tag_id_array, $tag_ids);
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$tags_ok = count($tag_ids) > 0;
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if(!$tags_ok) break;
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}
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if($tags_ok) {
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$tag_id_list = join(', ', $tag_id_array);
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$subquery = new Querylet("
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SELECT images.*, SUM({$tag_search->sql}) AS score
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FROM images
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LEFT JOIN image_tags ON image_tags.image_id = images.id
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JOIN tags ON image_tags.tag_id = tags.id
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WHERE tags.id IN ({$tag_id_list})
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GROUP BY images.id
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HAVING score = ?",
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array_merge(
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$tag_search->variables,
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array($positive_tag_count)
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)
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);
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$query = new Querylet("
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SELECT *, UNIX_TIMESTAMP(posted) AS posted_timestamp
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FROM ({$subquery->sql}) AS images ", $subquery->variables);
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if(strlen($img_search->sql) > 0) {
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$query->append_sql(" WHERE ");
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$query->append($img_search);
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}
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}
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else {
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# there are no results, "where 1=0" should shortcut things
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$query = new Querylet("
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SELECT images.*
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FROM images
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WHERE 1=0
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");
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}
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}
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return $query;
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}
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}
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}
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class Tag {
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class Tag {
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