Doctrine_manual-1-2-en

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Chapter 29: Technology 370 • State 57 , for state-wise connections • Strategy 58 , for algorithm strategies Enterprise application design patterns used: • Active Record 59 , Doctrine is an implementation of this pattern • UnitOfWork 60 , for maintaining a list of objects affected in a transaction • Identity Field 61 , for maintaining the identity between record and database row • Metadata Mapping 62 , for Doctrine DataDict • Dependent Mapping 63 , for mapping in general, since all records extend Doctrine_Record which performs all mappings • Foreign Key Mapping 64 , for one-to-one, one-to-many and many-to-one relationships • Association Table Mapping 65 , for association table mapping (most commonly manyto-many relationships) • Lazy Load 66 , for lazy loading of objects and object properties • Query Object 67 , DQL API is actually an extension to the basic idea of Query Object pattern Speed • Lazy initialization - For collection elements • Subselect fetching - Doctrine knows how to fetch collections efficiently using a subselect. • Executing SQL statements later, when needed : The connection never issues an INSERT or UPDATE until it is actually needed. So if an exception occurs and you need to abort the transaction, some statements will never actually be issued. Furthermore, this keeps lock times in the database as short as possible (from the late UPDATE to the transaction end). • Join fetching - Doctrine knows how to fetch complex object graphs using joins and subselects • Multiple collection fetching strategies - Doctrine has multiple collection fetching strategies for performance tuning. • Dynamic mixing of fetching strategies - Fetching strategies can be mixed and for example users can be fetched in a batch collection while users' phonenumbers are loaded in offset collection using only one query. • Driver specific optimizations - Doctrine knows things like bulk-insert on mysql. • Transactional single-shot delete - Doctrine knows how to gather all the primary keys of the pending objects in delete list and performs only one sql delete statement per table. • Updating only the modified columns. - Doctrine always knows which columns have been changed. 57. http://www.dofactory.com/Patterns/PatternState.aspx 58. http://www.dofactory.com/Patterns/PatternStrategy.aspx 59. http://www.martinfowler.com/eaaCatalog/activeRecord.html 60. http://www.martinfowler.com/eaaCatalog/unitOfWork.html 61. http://www.martinfowler.com/eaaCatalog/identityField.html 62. http://www.martinfowler.com/eaaCatalog/metadataMapping.html 63. http://www.martinfowler.com/eaaCatalog/dependentMapping.html 64. http://www.martinfowler.com/eaaCatalog/foreignKeyMapping.html 65. http://www.martinfowler.com/eaaCatalog/associationTableMapping.html 66. http://www.martinfowler.com/eaaCatalog/lazyLoad.html 67. http://www.martinfowler.com/eaaCatalog/queryObject.html ----------------- Brought to you by
Chapter 29: Technology 371 • Never inserting/updating unmodified objects. - Doctrine knows if the the state of the record has changed. • PDO for database abstraction - PDO is by far the fastest availible database abstraction layer for php. Conclusion This chapter should have given you a complete birds eye view of all the components of Doctrine and how they are organized. Up until now you have seen them all used a part from each other but the separate lists of the three main packages should have made things very clear for you if it was not already. Now we are ready to move on and learn about how to deal with Doctrine throwing exceptions in the Exceptions and Warnings (page 372) chapter. ----------------- Brought to you by
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Doctrine ORM for PHP Guide to Doctr
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Table of Contents iii Examples ....
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Table of Contents v Sample Queries
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Table of Contents vii Component Que
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Table of Contents ix Inserting a No
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Table of Contents xi Generating Mig
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Chapter 1: Introduction 13 Chapter
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Chapter 1: Introduction 15 layer de
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Chapter 1: Introduction 17 Further
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Chapter 2: Getting Started 19 Insta
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Chapter 4: Configuration 37 // boot
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Chapter 5: Connections 39 Chapter 5
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