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Improve many-to-many query performance

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This commit is contained in:
Dennis Eichhorn 2023-06-18 13:02:13 +00:00
parent 0fd9b3edd7
commit acf9a247f0
1 changed files with 9 additions and 28 deletions
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37
DataStorage/Database/Mapper/ReadMapper.php
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@ -26,8 +26,9 @@ use phpOMS\Utils\ArrayUtils;
* @link https://jingga.app
* @since 1.0.0
*
* @todo Add memory cache per read mapper parent call (These should be cached: attribute types, file types, etc.)
* @todo Add getArray functions to get array instead of object
* @todo Add memory cache per read mapper parent call (These should be cached: attribute types, file types, etc.)
* @todo Add getArray functions to get array instead of object
* @todo Allow to define columns in all functions instead of members?
*
* @template R
*/
@ -862,37 +863,17 @@ final class ReadMapper extends DataMapperAbstract
}
$objectMapper = $this->createRelationMapper($many['mapper']::get(db: $this->db), $member);
if ($many['external'] === null) {
if ($many['external'] === null/* same as $many['table'] !== $many['mapper']::TABLE */) {
$objectMapper->where($many['mapper']::COLUMNS[$many['self']]['internal'], $primaryKey);
} else {
// @todo: don't do this, even in a many-many relationship I should be able to use joins which the above if branch effectively is!
$query = new Builder($this->db, true);
$src = $many['external'] ?? $many['mapper']::PRIMARYFIELD;
// @todo: what if a specific column name is defined instead of primaryField for the join? Fix, it should be stored in 'column'
$query->select($many['table'] . '.' . $src)
->from($many['table'])
$query->leftJoin($many['table'])
->on($many['mapper']::TABLE . '_d1.' . $many['mapper']::PRIMARYFIELD, '=', $many['table'] . '.' . $many['external'])
->where($many['table'] . '.' . $many['self'], '=', $primaryKey);
if ($many['table'] !== $many['mapper']::TABLE) {
$query->leftJoin($many['mapper']::TABLE)
->on($many['table'] . '.' . $src, '=', $many['mapper']::TABLE . '.' . $many['mapper']::PRIMARYFIELD);
}
$sth = $this->db->con->prepare($query->toSql());
if ($sth === false) {
continue;
}
$sth->execute();
$result = $sth->fetchAll(\PDO::FETCH_COLUMN);
if (empty($result)) {
continue;
}
$objectMapper->where($many['mapper']::COLUMNS[$many['mapper']::PRIMARYFIELD]['internal'], $result, 'IN')->execute();
// Cannot use join, because join only works on members and we don't have members for a relation table
// This is why we need to create a "base" query which contians the join on table columns
$objectMapper->query($query);
}
$objects = $objectMapper->execute();