Viewing file:  BuildsQueries.php (9.79 KB) -rwxrwxrwx
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<?php
namespace Illuminate\Database\Concerns;
use Illuminate\Container\Container;
use Illuminate\Database\MultipleRecordsFoundException;
use Illuminate\Database\RecordsNotFoundException;
use Illuminate\Pagination\LengthAwarePaginator;
use Illuminate\Pagination\Paginator;
use Illuminate\Support\Collection;
use Illuminate\Support\LazyCollection;
use InvalidArgumentException;
trait BuildsQueries
{
/**
* Chunk the results of the query.
*
* @param int $count
* @param callable $callback
* @return bool
*/
public function chunk($count, callable $callback)
{
$this->enforceOrderBy();
$page = 1;
do {
// We'll execute the query for the given page and get the results. If there are
// no results we can just break and return from here. When there are results
// we will call the callback with the current chunk of these results here.
$results = $this->forPage($page, $count)->get();
$countResults = $results->count();
if ($countResults == 0) {
break;
}
// On each chunk result set, we will pass them to the callback and then let the
// developer take care of everything within the callback, which allows us to
// keep the memory low for spinning through large result sets for working.
if ($callback($results, $page) === false) {
return false;
}
unset($results);
$page++;
} while ($countResults == $count);
return true;
}
/**
* Run a map over each item while chunking.
*
* @param callable $callback
* @param int $count
* @return \Illuminate\Support\Collection
*/
public function chunkMap(callable $callback, $count = 1000)
{
$collection = Collection::make();
$this->chunk($count, function ($items) use ($collection, $callback) {
$items->each(function ($item) use ($collection, $callback) {
$collection->push($callback($item));
});
});
return $collection;
}
/**
* Execute a callback over each item while chunking.
*
* @param callable $callback
* @param int $count
* @return bool
*/
public function each(callable $callback, $count = 1000)
{
return $this->chunk($count, function ($results) use ($callback) {
foreach ($results as $key => $value) {
if ($callback($value, $key) === false) {
return false;
}
}
});
}
/**
* Chunk the results of a query by comparing IDs.
*
* @param int $count
* @param callable $callback
* @param string|null $column
* @param string|null $alias
* @return bool
*/
public function chunkById($count, callable $callback, $column = null, $alias = null)
{
$column = $column ?? $this->defaultKeyName();
$alias = $alias ?? $column;
$lastId = null;
$page = 1;
do {
$clone = clone $this;
// We'll execute the query for the given page and get the results. If there are
// no results we can just break and return from here. When there are results
// we will call the callback with the current chunk of these results here.
$results = $clone->forPageAfterId($count, $lastId, $column)->get();
$countResults = $results->count();
if ($countResults == 0) {
break;
}
// On each chunk result set, we will pass them to the callback and then let the
// developer take care of everything within the callback, which allows us to
// keep the memory low for spinning through large result sets for working.
if ($callback($results, $page) === false) {
return false;
}
$lastId = $results->last()->{$alias};
unset($results);
$page++;
} while ($countResults == $count);
return true;
}
/**
* Execute a callback over each item while chunking by ID.
*
* @param callable $callback
* @param int $count
* @param string|null $column
* @param string|null $alias
* @return bool
*/
public function eachById(callable $callback, $count = 1000, $column = null, $alias = null)
{
return $this->chunkById($count, function ($results, $page) use ($callback, $count) {
foreach ($results as $key => $value) {
if ($callback($value, (($page - 1) * $count) + $key) === false) {
return false;
}
}
}, $column, $alias);
}
/**
* Query lazily, by chunks of the given size.
*
* @param int $chunkSize
* @return \Illuminate\Support\LazyCollection
*/
public function lazy($chunkSize = 1000)
{
if ($chunkSize < 1) {
throw new InvalidArgumentException('The chunk size should be at least 1');
}
$this->enforceOrderBy();
return LazyCollection::make(function () use ($chunkSize) {
$page = 1;
while (true) {
$results = $this->forPage($page++, $chunkSize)->get();
foreach ($results as $result) {
yield $result;
}
if ($results->count() < $chunkSize) {
return;
}
}
});
}
/**
* Query lazily, by chunking the results of a query by comparing IDs.
*
* @param int $count
* @param string|null $column
* @param string|null $alias
* @return \Illuminate\Support\LazyCollection
*/
public function lazyById($chunkSize = 1000, $column = null, $alias = null)
{
if ($chunkSize < 1) {
throw new InvalidArgumentException('The chunk size should be at least 1');
}
$column = $column ?? $this->defaultKeyName();
$alias = $alias ?? $column;
return LazyCollection::make(function () use ($chunkSize, $column, $alias) {
$lastId = null;
while (true) {
$clone = clone $this;
$results = $clone->forPageAfterId($chunkSize, $lastId, $column)->get();
foreach ($results as $result) {
yield $result;
}
if ($results->count() < $chunkSize) {
return;
}
$lastId = $results->last()->{$alias};
}
});
}
/**
* Execute the query and get the first result.
*
* @param array|string $columns
* @return \Illuminate\Database\Eloquent\Model|object|static|null
*/
public function first($columns = ['*'])
{
return $this->take(1)->get($columns)->first();
}
/**
* Execute the query and get the first result if it's the sole matching record.
*
* @param array|string $columns
* @return \Illuminate\Database\Eloquent\Model|object|static|null
*
* @throws \Illuminate\Database\RecordsNotFoundException
* @throws \Illuminate\Database\MultipleRecordsFoundException
*/
public function sole($columns = ['*'])
{
$result = $this->take(2)->get($columns);
if ($result->isEmpty()) {
throw new RecordsNotFoundException;
}
if ($result->count() > 1) {
throw new MultipleRecordsFoundException;
}
return $result->first();
}
/**
* Apply the callback's query changes if the given "value" is true.
*
* @param mixed $value
* @param callable $callback
* @param callable|null $default
* @return mixed|$this
*/
public function when($value, $callback, $default = null)
{
if ($value) {
return $callback($this, $value) ?: $this;
} elseif ($default) {
return $default($this, $value) ?: $this;
}
return $this;
}
/**
* Pass the query to a given callback.
*
* @param callable $callback
* @return $this
*/
public function tap($callback)
{
return $this->when(true, $callback);
}
/**
* Apply the callback's query changes if the given "value" is false.
*
* @param mixed $value
* @param callable $callback
* @param callable|null $default
* @return mixed|$this
*/
public function unless($value, $callback, $default = null)
{
if (! $value) {
return $callback($this, $value) ?: $this;
} elseif ($default) {
return $default($this, $value) ?: $this;
}
return $this;
}
/**
* Create a new length-aware paginator instance.
*
* @param \Illuminate\Support\Collection $items
* @param int $total
* @param int $perPage
* @param int $currentPage
* @param array $options
* @return \Illuminate\Pagination\LengthAwarePaginator
*/
protected function paginator($items, $total, $perPage, $currentPage, $options)
{
return Container::getInstance()->makeWith(LengthAwarePaginator::class, compact(
'items', 'total', 'perPage', 'currentPage', 'options'
));
}
/**
* Create a new simple paginator instance.
*
* @param \Illuminate\Support\Collection $items
* @param int $perPage
* @param int $currentPage
* @param array $options
* @return \Illuminate\Pagination\Paginator
*/
protected function simplePaginator($items, $perPage, $currentPage, $options)
{
return Container::getInstance()->makeWith(Paginator::class, compact(
'items', 'perPage', 'currentPage', 'options'
));
}
}
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