43 lines
2.1 KiB
PHP
43 lines
2.1 KiB
PHP
Whenever you fetch records with eg. Doctrine_Table::findAll or Doctrine_Connection::query methods an instance of
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Doctrine_Collection is returned. There are many types of collections in Doctrine and it is crucial to understand
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the differences of these collections. Remember choosing the right fetching strategy (collection type) is one of the most
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influental things when it comes to boosting application performance.
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<br \><br \>
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<li>Immediate Collection<ul>
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Fetches all records and all record data immediately into collection memory. Use this collection only if you really need to show all that data
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in web page.
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<br \><br \>
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Example query:<br \>
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SELECT id, name, type, created FROM user
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<br \><br \></ul>
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<li>Batch Collection<ul>
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Fetches all record primary keys into colletion memory. When individual collection elements are accessed this collection initializes proxy objects.
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When the non-primary-key-property of a proxy object is accessed that object sends request to Batch collection which loads the data
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for that specific proxy object as well as other objects close to that proxy object.
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<br \><br \>
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Example queries:<br \>
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SELECT id FROM user<br \>
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SELECT id, name, type, created FROM user WHERE id IN (1,2,3,4,5)<br \>
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SELECT id, name, type, created FROM user WHERE id IN (6,7,8,9,10)<br \>
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[ ... ]<br \>
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</ul>
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<li>Lazy Collection<ul>
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Lazy collection is exactly same as Batch collection with batch size preset to one.
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<br \><br \>
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Example queries:<br \>
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SELECT id FROM user<br \>
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SELECT id, name, type, created FROM user WHERE id = 1<br \>
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SELECT id, name, type, created FROM user WHERE id = 2<br \>
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SELECT id, name, type, created FROM user WHERE id = 3<br \>
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[ ... ]<br \>
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</ul>
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<li>Offset Collection<ul>
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Offset collection is the same as immediate collection with the difference that it uses database provided limiting of queries.
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<br \><br \>
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Example queries:<br \>
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SELECT id, name, type, created FROM user LIMIT 5<br \>
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SELECT id, name, type, created FROM user LIMIT 5 OFFSET 5<br \>
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SELECT id, name, type, created FROM user LIMIT 5 OFFSET 10<br \>
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[ ... ]<br \></ul>
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