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plurals

PO
primarykey
Id
8050566
data
AcceptedAnswerId
0
AnswerCount
0
ClosedDate
CommentCount
2
CommunityOwnedDate
CreationDate
2011-11-08T12:45:34.730
FavoriteCount
0
LastActivityDate
2011-11-08T13:09:32.233
LastEditDate
2011-11-08T13:09:32.233
LastEditorUserId
450383
OwnerUserId
450383
ParentId
8048156
PostTypeId
2
Score
4
ViewCount
0
LastEditorDisplayName
text
Body
I would use an Iterator that iterates over another Iterator and asks for a next Iterator once it reaches the end of the previous Iterator... ok, sounds a mo complicated than it actually is: <pre><code><?php $limit = 100; $offset = 0; $iter = new NextIteratorCallbackIterator(function($i) use ($orm, $limit, &$offset) { printf("selecting next bunch at offset %d\n", $offset); $recs = $orm->select($filter, $sorting, $limit , $offset); $offset += $limit; if ($recs) { return new ArrayIterator($recs); } return null; // end reached }); foreach ($iter as $rec) { // do something with record } ?> </code></pre> And here is a sample Implementation of that NextIteratorCallbackIterator: <pre><code><?php class NextIteratorCallbackIterator implements Iterator { private $_iterator = null; private $_count = 0; private $_callback; public function __construct($callback) { if (!is_callable($callback)) { throw new Exception(__CLASS__.": callback must be callable"); } $this->_callback = $callback; } public function current() { return $this->_iterator !== null ? $this->_iterator->current() : null; } public function key() { return $this->_iterator !== null ? $this->_iterator->key() : null; } public function next() { $tryNext = ($this->_iterator === null); do { if ($tryNext) { $tryNext = false; $this->_iterator = call_user_func($this->_callback, ++$this->_count); } elseif ($this->_iterator !== null) { $this->_iterator->next(); if ($this->_iterator->valid() == false) { $tryNext = true; } } } while ($tryNext); } public function rewind() { $this->_iterator = call_user_func($this->_callback, $this->_count = 0); } public function valid () { return $this->_iterator !== null; } } ?> </code></pre> UPDATE: Your ORMPagedIterator can be implemented using NextIteratorCallbackIterator as easy as: <pre><code><?php class ORMPagedIterator implements IteratorAggregate { function __construct($orm, $filter, $sorting, $chunksize = 100) { $this->orm = $orm; $this->filter = $filter; $this->sorting = $sorting; $this->chunksize = $chunksize; } function iteratorNext($i) { $offset = $this->chunksize * $i; $recs = $this->orm->select($this->filter, $this->sorting, $this->chunksize, $offset); if ($recs) { return new ArrayIterator($recs); } return null; // end reached } function getIterator() { return new NextIteratorCallbackIterator(array($this,"iteratorNext")); } } ?> </code></pre>
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1. POUsing PHP iterators
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1. COhm, that's good, thank you.
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2. COI like to add that you should avoid selecting with large offsets, because with increasing offsets your DB will have to do more and more work to get you the results. If your result set is sorted in by its primary key, you should use the last key of the previous result set as the start key for the next... that way your querys will not slow down...
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