Doctrine 2.0 Enterprise Persistence Layer for PHP

Doctrine 2.0
Enterprise Persistence Layer for PHP

Who am I?
Frontend web developer since 1998
Moved to backend programming in 2002
Currently employee of MIH – SWAT team
Committer of many O.S. projects, including Zend Framework, Symfony and Doctrine
Enjoys to play Age of Empires

What is Doctrine?
Doctrine is an Object Relational Modeling tool for PHP, mostly inspired by Hibernate (Java) and ActiveRecord (Ruby)

Doctrine Roadmap
Very active community
Monthly releases
Current work branches:
1.0 (LTS), 1.1, 1.2 (LTS), 2.0 (LTS)

Doctrine Integration & Support
Integrates with many different frameworks:
Zend Framework
Symfony
CodeIgniter
Kohana
…
Supports all drivers supported by PDO

Doctrine 2.0 - Architecture
Based on JSR-317 a.k.a. JPA v2.0 (~80%)
Java…. What?!? #$&*@!
PHP still lacks of standards
PHP Standards Group to the rescue!

Doctrine 2.0
Challenges

Doctrine 2.0 - Challenges
No need to extend base class
New Reflection support
Benchmarks (˜50000 iterations):
Setter:
$o->prop set: 0.35872411727905
$o->setProp: 0.61513090133667 (71% slower)
$reflProp->setValue: 0.67149507522583 (87% slower)
Getter:
$o->prop get: 0.25784397125244
$o->getProp: 0.46534395217896 (80% slower)
$reflProp->getValue: 0.64541401863098 (150% slower)

Optimize hydration of entities
Garbage Collector – Identity Map
spl_object_hash
SplObjectStoragevs. ArrayAccess

Optimize hydration of Entities
Benchmarks:
Doctrine 1.1
4.3435637950897 for 5000 records
Doctrine 2.0
1.4314442552312 for 5000 records
3.4690098762528 for 10000 records

Replication support
Internal mindset change
No more weird DSN constructions
No more shared Identity Maps across multiple connections

Huge API of public methods
Lambdas and Closures
Centralized entry points of methods
No singleton nightmares!
- I have a problem!
- You can fix it with a singleton.
- Now I have 2 problems…

RDBMS <-> PHP differences
Clean separation of Platforms via Dialects
Separation between DB valueandPHP value
Extendable to user land

String processing for DQL
Implemented a LL(*) parser
Constructs AST nodes
TreeWalkersto do compilation DQL -> SQL
Cache support to prevent overhead

Metadata Mapping
Extendable mapping drivers
Should not mess Entities code – VOs
Cache support to prevent overhead

Real Native SQL support
Introduction of ResultsetMapping support
Allow custom columns to be mapped into VOs
Specific DBMS SQL supported

Commit ordering
True multigraph implementation
Topological Sorting
Prevents cycles
F*cking incredible fast!

Doctrine 2.0
Almost 95% of codebase rewritten
Requires PHP 5.3

Doctrine 2.0
Simplified public API
Smaller footprint

Doctrine 2.0
Un-necessary clutter removed
No more cyclic references

Doctrine 2.0
Code heavily decoupled
Extremely extendable

Doctrine 2.0
Three main packages:
Common
DBAL
ORM
Maybe in the future ODM…
Anyone interested to contribute?

Doctrine 2.0 - Common
Class Loaders
Annotations support
Collection
Cache
Event System
Common LL(*) classes

Class loaders:
GlobalClassLoader
IsolatedClassLoader

Annotations EBNF – Yeah baby!
Annotation ::= "@" AnnotationName ["(" [Values] ")”]
AnnotationName ::= QualifiedName | SimpleName
QualifiedName ::= NameSpacePart "" {NameSpacePart ""}* SimpleName
NameSpacePart ::= identifier
SimpleName ::= identifier
Values ::= Array | Value {"," Value}*
Value ::= PlainValue | FieldAssignment
PlainValue ::= integer | string | float | boolean | Array | Annotation
FieldAssignment ::= FieldName "=" PlainValue
FieldName ::= identifier
Array ::= "{" ArrayEntry {"," ArrayEntry}* "}”
ArrayEntry ::= Value | KeyValuePair
KeyValuePair ::= Key "=" PlainValue
Key ::= string | integer

Doctrine 2.0 - DBAL
Use DBAL independent of ORM
Powerful Database Abstraction Layer
Always existed, but it wasn’t advertised
Can be a separate package in the future

Doctrine 2.0 - DBAL
Platforms, Drivers and SchemaManagers
Nested transactions
Fully supports:
Schemas
Sequences
Catalogs

Doctrine 2.0 - DBAL

Doctrine 2.0 - ORM
Supports:
One-to-one
One-to-many
Many-to-many
Multigraph
Unidirectional
Bidirectional

Doctrine 2.0 - ORM
Simplified bootstrap code

Doctrine 2.0 - ORM
Driver based Metadata
Annotations
PHP
XML
YAML
… your own?!

Doctrine 2.0 - ORM

Doctrine 2.0 - ORM
Working with objects

Doctrine 2.0 - ORM
Doctrine Query Language
Similar do HQL or JPQL
Automatically makes join restrictions
Supports inheritance natively
Can be boosted by usage of a Query Cache
Easily extendable

Doctrine 2.0 - ORM
Querying
DQL string
QueryBuilder object (Criteria)
Native SQL query

Doctrine 2.0 - ORM

Doctrine 2.0 - CLI
Directed Acyclic Graphs
Easily extendable
Several handy tasks to help development
Schema-tool
Generate-proxies
Convert-mapping
Run-sql
Run-dql

Doctrine 2.0 - CLI

Questions?

Thanks!!!
Guilherme Blanco
guilhermeblancogmail com
+55 16 9215.8480
http://www.doctrine-project.org

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Doctrine 2.0 Enterprise Persistence Layer for PHP

by Guilherme Blanco on Oct 20, 2009

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