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|
<?php
/**
* This class is to be used in combination with SQLQuery if you need to
* combine many SQLQuery objets into one single query using UNION.
*/
class SQLUnionQuery
{
/**
* @var SQLQuery[]
*/
protected array $queries;
protected bool $unionAll = false;
public function __construct(SQLQuery ...$queries)
{
$this->queries = $queries;
}
/**
* Adds a query to the union.
*/
public function add(SQLQuery $query): void
{
$this->queries[] = $query;
}
/**
* Whether UNION ALL should be used or not
*/
public function setUnionAll(bool $unionAll): void
{
$this->unionAll = $unionAll;
}
/**
* Returns the combined query
*/
public function getQuery(): string
{
$queries = [];
foreach ($this->queries as $query) {
$queries[] = $query->show();
}
$query = implode(
$this->unionAll ? ' UNION ALL ' : ' UNION ',
$queries
);
return $query;
}
/**
* Returns the used parameters
*/
public function getParameters(): array
{
$parameters = [];
foreach ($this->queries as $query) {
$parameters = array_merge($parameters, $query->settings['parameter'] ?? []);
}
return $parameters;
}
/**
* Fetches all rows from the combined query
*/
public function fetchAll(?callable $callable = null): array
{
return DBManager::get()->fetchAll(
$this->getQuery(),
$this->getParameters(),
$callable
);
}
/**
* Fetches a single column from all rows of the combined query
*/
public function fetchFirst(int $columnNumber = 0): array
{
return $this->fetchAll(function ($row) use ($columnNumber) {
return array_values($row)[$columnNumber];
});
}
}
|
