inline build_accurate_search_querylet
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Shish
parent
188d809ee7
commit
1a07f84622
1 changed files with 95 additions and 106 deletions
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@ -859,8 +859,9 @@ class Image
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?string $order=null,
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?int $limit=null,
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?int $offset=null
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): Querylet
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{
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): Querylet {
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global $database;
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list($tag_conditions, $img_conditions) = self::terms_to_conditions($tags);
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$positive_tag_count = 0;
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@ -932,7 +933,98 @@ class Image
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// more than one positive tag, or more than zero negative tags
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else {
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$query = Image::build_accurate_search_querylet($tag_conditions);
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$positive_tag_id_array = [];
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$positive_wildcard_id_array = [];
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$negative_tag_id_array = [];
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foreach ($tag_conditions as $tq) {
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$sq = "
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SELECT id
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FROM tags
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WHERE LOWER(tag) LIKE LOWER(:tag)
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";
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if ($database->get_driver_name() === DatabaseDriver::SQLITE) {
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$sq .= "ESCAPE '\\'";
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}
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$tag_ids = $database->get_col(
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$sq,
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["tag" => Tag::sqlify($tq->tag)]
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);
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$tag_count = count($tag_ids);
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if ($tq->positive) {
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if ($tag_count== 0) {
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# one of the positive tags had zero results, therefor there
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# can be no results; "where 1=0" should shortcut things
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return new Querylet("
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SELECT images.*
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FROM images
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WHERE 1=0
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");
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} elseif ($tag_count==1) {
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// All wildcard terms that qualify for a single tag can be treated the same as non-wildcards
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$positive_tag_id_array[] = $tag_ids[0];
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} else {
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// Terms that resolve to multiple tags act as an OR within themselves
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// and as an AND in relation to all other terms,
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$positive_wildcard_id_array[] = $tag_ids;
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}
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} else {
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// Unlike positive criteria, negative criteria are all handled in an OR fashion,
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// so we can just compile them all into a single sub-query.
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$negative_tag_id_array = array_merge($negative_tag_id_array, $tag_ids);
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}
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}
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assert($positive_tag_id_array || $positive_wildcard_id_array || $negative_tag_id_array, @$_GET['q']);
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if (!empty($positive_tag_id_array) || !empty($positive_wildcard_id_array)) {
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$inner_joins = [];
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if (!empty($positive_tag_id_array)) {
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foreach ($positive_tag_id_array as $tag) {
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$inner_joins[] = "= $tag";
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}
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}
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if (!empty($positive_wildcard_id_array)) {
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foreach ($positive_wildcard_id_array as $tags) {
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$positive_tag_id_list = join(', ', $tags);
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$inner_joins[] = "IN ($positive_tag_id_list)";
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}
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}
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$first = array_shift($inner_joins);
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$sub_query = "SELECT it.image_id FROM image_tags it ";
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$i = 0;
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foreach ($inner_joins as $inner_join) {
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$i++;
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$sub_query .= " INNER JOIN image_tags it$i ON it$i.image_id = it.image_id AND it$i.tag_id $inner_join ";
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}
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if (!empty($negative_tag_id_array)) {
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$negative_tag_id_list = join(', ', $negative_tag_id_array);
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$sub_query .= " LEFT JOIN image_tags negative ON negative.image_id = it.image_id AND negative.tag_id IN ($negative_tag_id_list) ";
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}
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$sub_query .= "WHERE it.tag_id $first ";
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if (!empty($negative_tag_id_array)) {
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$sub_query .= " AND negative.image_id IS NULL";
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}
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$sub_query .= " GROUP BY it.image_id ";
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$query = new Querylet("
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SELECT images.*
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FROM images
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INNER JOIN ($sub_query) a on a.image_id = images.id
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");
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} elseif (!empty($negative_tag_id_array)) {
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$negative_tag_id_list = join(', ', $negative_tag_id_array);
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$query = new Querylet("
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SELECT images.*
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FROM images
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LEFT JOIN image_tags negative ON negative.image_id = images.id AND negative.tag_id in ($negative_tag_id_list)
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WHERE negative.image_id IS NULL
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");
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} else {
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throw new SCoreException("No criteria specified");
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}
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}
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/*
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@ -967,107 +1059,4 @@ class Image
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return $query;
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}
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/**
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* #param TagQuerylet[] $tag_conditions
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*/
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private static function build_accurate_search_querylet(array $tag_conditions): Querylet
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{
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global $database;
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$positive_tag_id_array = [];
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$positive_wildcard_id_array = [];
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$negative_tag_id_array = [];
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foreach ($tag_conditions as $tq) {
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$sq = "
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SELECT id
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FROM tags
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WHERE LOWER(tag) LIKE LOWER(:tag)
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";
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if ($database->get_driver_name() === DatabaseDriver::SQLITE) {
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$sq .= "ESCAPE '\\'";
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}
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$tag_ids = $database->get_col(
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$sq,
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["tag" => Tag::sqlify($tq->tag)]
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);
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$tag_count = count($tag_ids);
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if ($tq->positive) {
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if ($tag_count== 0) {
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# one of the positive tags had zero results, therefor there
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# can be no results; "where 1=0" should shortcut things
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return new Querylet("
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SELECT images.*
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FROM images
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WHERE 1=0
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");
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} elseif ($tag_count==1) {
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// All wildcard terms that qualify for a single tag can be treated the same as non-wildcards
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$positive_tag_id_array[] = $tag_ids[0];
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} else {
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// Terms that resolve to multiple tags act as an OR within themselves
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// and as an AND in relation to all other terms,
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$positive_wildcard_id_array[] = $tag_ids;
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}
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} else {
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// Unlike positive criteria, negative criteria are all handled in an OR fashion,
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// so we can just compile them all into a single sub-query.
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$negative_tag_id_array = array_merge($negative_tag_id_array, $tag_ids);
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}
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}
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assert($positive_tag_id_array || $positive_wildcard_id_array || $negative_tag_id_array, @$_GET['q']);
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if (!empty($positive_tag_id_array) || !empty($positive_wildcard_id_array)) {
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$inner_joins = [];
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if (!empty($positive_tag_id_array)) {
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foreach ($positive_tag_id_array as $tag) {
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$inner_joins[] = "= $tag";
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}
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}
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if (!empty($positive_wildcard_id_array)) {
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foreach ($positive_wildcard_id_array as $tags) {
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$positive_tag_id_list = join(', ', $tags);
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$inner_joins[] = "IN ($positive_tag_id_list)";
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}
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}
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$first = array_shift($inner_joins);
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$sub_query = "SELECT it.image_id FROM image_tags it ";
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$i = 0;
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foreach ($inner_joins as $inner_join) {
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$i++;
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$sub_query .= " INNER JOIN image_tags it$i ON it$i.image_id = it.image_id AND it$i.tag_id $inner_join ";
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}
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if (!empty($negative_tag_id_array)) {
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$negative_tag_id_list = join(', ', $negative_tag_id_array);
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$sub_query .= " LEFT JOIN image_tags negative ON negative.image_id = it.image_id AND negative.tag_id IN ($negative_tag_id_list) ";
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}
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$sub_query .= "WHERE it.tag_id $first ";
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if (!empty($negative_tag_id_array)) {
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$sub_query .= " AND negative.image_id IS NULL";
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}
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$sub_query .= " GROUP BY it.image_id ";
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$sql = "
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SELECT images.*
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FROM images INNER JOIN (
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$sub_query
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) a on a.image_id = images.id
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";
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} elseif (!empty($negative_tag_id_array)) {
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$negative_tag_id_list = join(', ', $negative_tag_id_array);
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$sql = "
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SELECT images.*
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FROM images LEFT JOIN image_tags negative ON negative.image_id = images.id AND negative.tag_id in ($negative_tag_id_list)
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WHERE negative.image_id IS NULL
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";
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} else {
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throw new SCoreException("No criteria specified");
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}
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return new Querylet($sql);
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}
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}
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