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Doctrine ORM Good Practices and Tricks
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- 1 Intro
- 2 DOCTRINE PROJECT A group of persistence-oriented libraries for PHP
- 3 WE ARE LOOKING FOR CONTRIBUTORS! (Must be prepared to take unpopular decisions)
- 4 DOCTRINE 2 ORM BEST PRACTICES
- 5 KNOW YOUR ENEMY
- 6 OLTP
- 7 FAST PROTOTYPING
- 8 DYNAMIC DATA STRUCTURES
- 9 REPORTING That's what SQL is for It's a QUERY language, after all
- 10 ENTITIES (OF COURSE) Entities should work without the ORM Entities should work without the DB
- 11 ENTITIES (MOSTLY) REPRESENT YOUR DOMAIN
- 12 THE DATABASE IS JUST SAVING THINGS
- 13 DESIGN ENTITIES FIRST
- 14 DEFINE THE DATABASE AFTER MODELING YOUR DOMAIN
- 15 DEFINE MAPPINGS AFTER DESIGNING THE ENTITIES
- 16 DESIGNING ENTITIES
- 17 ENTITIES ARE NOT TYPED ARRAYS
- 18 ENTITIES HAVE BEHAVIOR
- 19 ENTITY INTERNAL STATE DESIGN IS IRRELEVANT You can deal with state after designing the API Designing State-first leads to terrible coupling
- 20 RESPECT THE LOD
- 21 DISALLOW COLLECTION ACCESS FROM OUTSIDE THE ENTITY
- 22 STAY VALID AFTER _CONSTRUCT (Regardless of the DB) Named constructors are OK
- 23 AVOID SETTERS
- 24 AVOID COUPLING WITH THE APPLICATION LAYER
- 25 FORM COMPONENTS BREAK ENTITY VALIDITY
- 26 AVOID LIFECYCLE CALLBACKS
- 27 LIFECYCLE CALLBACKS ARE A PERSISTENCE HACK
- 28 AUTO INCREMENT IS ABUSED FOR SORTING Are you looking for a DATETIME field instead?
- 29 AVOID DERIVED PRIMARY KEYS You are just normalizing for the sake of it Does your domain really NEED it?
- 30 AVOID COMPOSITE PRIMARY KEYS Any reason to not use an unique constraint instead? Do they make a difference in your domain?
- 31 FAVOUR IMMUTABLE ENTITIES Or append-only data-structures
- 32 Immutable data is simple Immutable data is cacheable (forever) Immutable data is predictable Immutable data enables historical analysis
- 33 AVOID SOFT-DELETES
- 34 SOFT DELETES ARE A BROKEN IDEA
- 35 SOFT DELETES BREAK DATA INTEGRITY (and therefore validity)
- 36 Soft Deletes can usually be replaced with more specific domain concepts
- 37 MAPPING DRIVER CHOICE
- 38 USE ANNOTATIONS IN PRIVATE PACKAGES
- 39 USE XML MAPPINGS IN PUBLIC PACKAGES
- 40 LAZY OR EAGER?
- 41 EAGER LOADING IS USELESS
- 42 EXTRA LAZY INDICATES HIGH RISK AREAS We reach the limits of the ORM Careful about performance/transaction size!
- 43 AVOID BI-DIRECTIONAL ASSOCIATIONS
- 44 BI-DIRECTIONAL ASSOCIATIONS ARE OVERHEAD
- 45 USE CUSTOM REPOSITORIES FOR IMPROVED EXPRESSIVENESS
- 46 REPOSITORIES ARE SERVICES So are Query Functions
- 47 INJECT REPOSITORIES INSTEAD
- 48 KEEP NORMALIZATION UNDER CONTROL
- 49 KEEP NORMALIZATION (FREAKS) UNDER CONTROL
- 50 You may need to gag your DBAs... Or get them to understand your needs Academic and practical knowledge may differ
- 51 WHAT ABOUT PERFORMANCE?
- 52 RECAP
- 53 DOMAIN FIRST
- 54 DO NOT NORMALIZE WITHOUT A NEED FOR IT Otherwise, you're digging your own grave!
- 55 CONSIDER USING SEPARATE DBS Transactional Data
