868 lines
23 KiB
ReStructuredText
868 lines
23 KiB
ReStructuredText
Annotations Reference
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=====================
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In this chapter a reference of every Doctrine 2 Annotation is given
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with short explanations on their context and usage.
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Index
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-----
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- :ref:`@Column <annref_column>`
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- :ref:`@ChangeTrackingPolicy <annref_changetrackingpolicy>`
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- :ref:`@DiscriminatorColumn <annref_discriminatorcolumn>`
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- :ref:`@DiscriminatorMap <annref_discriminatormap>`
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- :ref:`@Entity <annref_entity>`
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- :ref:`@GeneratedValue <annref_generatedvalue>`
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- :ref:`@HasLifecycleCallbacks <annref_haslifecyclecallbacks>`
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- :ref:`@Index <annref_index>`
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- :ref:`@Id <annref_id>`
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- :ref:`@InheritanceType <annref_inheritancetype>`
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- :ref:`@JoinColumn <annref_joincolumn>`
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- :ref:`@JoinTable <annref_jointable>`
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- :ref:`@ManyToOne <annref_manytoone>`
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- :ref:`@ManyToMany <annref_manytomany>`
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- :ref:`@MappedSuperclass <annref_mappedsuperclass>`
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- :ref:`@OneToOne <annref_onetoone>`
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- :ref:`@OneToMany <annref_onetomany>`
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- :ref:`@OrderBy <annref_orderby>`
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- :ref:`@PostLoad <annref_postload>`
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- :ref:`@PostPersist <annref_postpersist>`
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- :ref:`@PostRemove <annref_postremove>`
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- :ref:`@PostUpdate <annref_postupdate>`
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- :ref:`@PrePersist <annref_prepersist>`
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- :ref:`@PreRemove <annref_preremove>`
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- :ref:`@PreUpdate <annref_preupdate>`
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- :ref:`@SequenceGenerator <annref_sequencegenerator>`
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- :ref:`@Table <annref_table>`
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- :ref:`@UniqueConstraint <annref_uniqueconstraint>`
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- :ref:`@Version <annref_version>`
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Reference
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---------
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.. _annref_column:
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@Column
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~~~~~~~
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Marks an annotated instance variable as "persistent". It has to be
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inside the instance variables PHP DocBlock comment. Any value hold
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inside this variable will be saved to and loaded from the database
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as part of the lifecycle of the instance variables entity-class.
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Required attributes:
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- **type**: Name of the Doctrine Type which is converted between PHP
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and Database representation.
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Optional attributes:
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- **name**: By default the property name is used for the database
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column name also, however the 'name' attribute allows you to
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determine the column name.
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- **length**: Used by the "string" type to determine its maximum
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length in the database. Doctrine does not validate the length of a
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string values for you.
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- **precision**: The precision for a decimal (exact numeric) column
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(Applies only for decimal column)
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- **scale**: The scale for a decimal (exact numeric) column (Applies
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only for decimal column)
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- **unique**: Boolean value to determine if the value of the column
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should be unique across all rows of the underlying entities table.
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- **nullable**: Determines if NULL values allowed for this column.
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- **columnDefinition**: DDL SQL snippet that starts after the column
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name and specifies the complete (non-portable!) column definition.
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This attribute allows to make use of advanced RMDBS features.
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However you should make careful use of this feature and the
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consequences. SchemaTool will not detect changes on the column correctly
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anymore if you use "columnDefinition".
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Additionally you should remember that the "type"
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attribute still handles the conversion between PHP and Database
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values. If you use this attribute on a column that is used for
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joins between tables you should also take a look at
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:ref:`@JoinColumn <annref_joincolumn>`.
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Examples:
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.. code-block:: php
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<?php
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/**
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* @Column(type="string", length=32, unique=true, nullable=false)
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*/
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protected $username;
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/**
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* @Column(type="string", columnDefinition="CHAR(2) NOT NULL")
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*/
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protected $country;
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/**
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* @Column(type="decimal", precision=2, scale=1)
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*/
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protected $height;
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.. _annref_changetrackingpolicy:
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@ChangeTrackingPolicy
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~~~~~~~~~~~~~~~~~~~~~
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The Change Tracking Policy annotation allows to specify how the
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Doctrine 2 UnitOfWork should detect changes in properties of
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entities during flush. By default each entity is checked according
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to a deferred implicit strategy, which means upon flush UnitOfWork
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compares all the properties of an entity to a previously stored
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snapshot. This works out of the box, however you might want to
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tweak the flush performance where using another change tracking
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policy is an interesting option.
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The :doc:`details on all the available change tracking policies <change-tracking-policies>`
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can be found in the configuration section.
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Example:
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.. code-block:: php
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<?php
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/**
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* @Entity
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* @ChangeTrackingPolicy("DEFERRED_IMPLICIT")
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* @ChangeTrackingPolicy("DEFERRED_EXPLICIT")
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* @ChangeTrackingPolicy("NOTIFY")
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*/
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class User {}
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.. _annref_discriminatorcolumn:
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@DiscrimnatorColumn
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~~~~~~~~~~~~~~~~~~~~~
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This annotation is a required annotation for the topmost/super
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class of an inheritance hierarchy. It specifies the details of the
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column which saves the name of the class, which the entity is
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actually instantiated as.
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Required attributes:
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- **name**: The column name of the discriminator. This name is also
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used during Array hydration as key to specify the class-name.
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Optional attributes:
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- **type**: By default this is string.
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- **length**: By default this is 255.
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.. _annref_discriminatormap:
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@DiscriminatorMap
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~~~~~~~~~~~~~~~~~~~~~
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The discriminator map is a required annotation on the
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top-most/super class in an inheritance hierarchy. It takes an array
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as only argument which defines which class should be saved under
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which name in the database. Keys are the database value and values
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are the classes, either as fully- or as unqualified class names
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depending if the classes are in the namespace or not.
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.. code-block:: php
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<?php
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/**
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* @Entity
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* @InheritanceType("JOINED")
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* @DiscriminatorColumn(name="discr", type="string")
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* @DiscriminatorMap({"person" = "Person", "employee" = "Employee"})
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*/
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class Person
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{
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// ...
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}
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.. _annref_entity:
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@Entity
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~~~~~~~
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Required annotation to mark a PHP class as Entity. Doctrine manages
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the persistence of all classes marked as entity.
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Optional attributes:
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- **repositoryClass**: Specifies the FQCN of a subclass of the
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Doctrine. Use of repositories for entities is encouraged to keep
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specialized DQL and SQL operations separated from the Model/Domain
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Layer.
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- **readOnly**: (>= 2.1) Specifies that this entity is marked as read only and not
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considered for change-tracking. Entities of this type can be persisted
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and removed though.
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Example:
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.. code-block:: php
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<?php
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/**
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* @Entity(repositoryClass="MyProject\UserRepository")
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*/
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class User
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{
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//...
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}
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.. _annref_generatedvalue:
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@GeneratedValue
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~~~~~~~~~~~~~~~~~~~~~
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Specifies which strategy is used for identifier generation for an
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instance variable which is annotated by :ref:`@Id <annref_id>`. This
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annotation is optional and only has meaning when used in
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conjunction with @Id.
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If this annotation is not specified with @Id the NONE strategy is
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used as default.
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Required attributes:
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- **strategy**: Set the name of the identifier generation strategy.
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Valid values are AUTO, SEQUENCE, TABLE, IDENTITY and NONE.
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Example:
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.. code-block:: php
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<?php
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/**
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* @Id
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* @Column(type="integer")
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* @generatedValue(strategy="IDENTITY")
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*/
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protected $id = null;
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.. _annref_haslifecyclecallbacks:
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@HasLifecycleCallbacks
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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Annotation which has to be set on the entity-class PHP DocBlock to
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notify Doctrine that this entity has entity life-cycle callback
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annotations set on at least one of its methods. Using @PostLoad,
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@PrePersist, @PostPersist, @PreRemove, @PostRemove, @PreUpdate or
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@PostUpdate without this marker annotation will make Doctrine
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ignore the callbacks.
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Example:
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.. code-block:: php
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<?php
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/**
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* @Entity
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* @HasLifecycleCallbacks
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*/
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class User
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{
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/**
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* @PostPersist
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*/
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public function sendOptinMail() {}
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}
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.. _annref_index:
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@Index
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~~~~~~~
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Annotation is used inside the :ref:`@Table <annref_table>` annotation on
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the entity-class level. It allows to hint the SchemaTool to
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generate a database index on the specified table columns. It only
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has meaning in the SchemaTool schema generation context.
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Required attributes:
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- **name**: Name of the Index
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- **columns**: Array of columns.
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Example:
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.. code-block:: php
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<?php
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/**
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* @Entity
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* @Table(name="ecommerce_products",indexes={@index(name="search_idx", columns={"name", "email"})})
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*/
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class ECommerceProduct
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{
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}
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.. _annref_id:
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@Id
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~~~~~~~
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The annotated instance variable will be marked as entity
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identifier, the primary key in the database. This annotation is a
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marker only and has no required or optional attributes. For
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entities that have multiple identifier columns each column has to
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be marked with @Id.
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Example:
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.. code-block:: php
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<?php
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/**
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* @Id
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* @Column(type="integer")
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*/
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protected $id = null;
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.. _annref_inheritancetype:
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@InheritanceType
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~~~~~~~~~~~~~~~~~~~~~
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In an inheritance hierarchy you have to use this annotation on the
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topmost/super class to define which strategy should be used for
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inheritance. Currently Single Table and Class Table Inheritance are
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supported.
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This annotation has always been used in conjunction with the
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:ref:`@DiscriminatorMap <annref_discriminatormap>` and
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:ref:`@DiscriminatorColumn <annref_discriminatorcolumn>` annotations.
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Examples:
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.. code-block:: php
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<?php
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/**
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* @Entity
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* @InheritanceType("SINGLE_TABLE")
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* @DiscriminatorColumn(name="discr", type="string")
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* @DiscriminatorMap({"person" = "Person", "employee" = "Employee"})
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*/
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class Person
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{
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// ...
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}
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/**
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* @Entity
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* @InheritanceType("JOINED")
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* @DiscriminatorColumn(name="discr", type="string")
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* @DiscriminatorMap({"person" = "Person", "employee" = "Employee"})
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*/
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class Person
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{
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// ...
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}
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.. _annref_joincolumn:
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@JoinColumn
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~~~~~~~~~~~~~~
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This annotation is used in the context of relations in
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:ref:`@ManyToOne <annref_manytoone>`, :ref:`@OneToOne <annref_onetoone>` fields
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and in the Context of :ref:`@JoinTable <annref_jointable>` nested inside
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a @ManyToMany. This annotation is not required. If its not
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specified the attributes *name* and *referencedColumnName* are
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inferred from the table and primary key names.
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Required attributes:
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- **name**: Column name that holds the foreign key identifier for
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this relation. In the context of @JoinTable it specifies the column
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name in the join table.
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- **referencedColumnName**: Name of the primary key identifier that
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is used for joining of this relation.
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Optional attributes:
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- **unique**: Determines if this relation exclusive between the
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affected entities and should be enforced so on the database
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constraint level. Defaults to false.
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- **nullable**: Determine if the related entity is required, or if
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null is an allowed state for the relation. Defaults to true.
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- **onDelete**: Cascade Action (Database-level)
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- **onUpdate**: Cascade Action (Database-level)
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- **columnDefinition**: DDL SQL snippet that starts after the column
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name and specifies the complete (non-portable!) column definition.
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This attribute allows to make use of advanced RMDBS features. Using
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this attribute on @JoinColumn is necessary if you need slightly
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different column definitions for joining columns, for example
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regarding NULL/NOT NULL defaults. However by default a
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"columnDefinition" attribute on :ref:`@Column <annref_column>` also sets
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the related @JoinColumn's columnDefinition. This is necessary to
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make foreign keys work.
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Example:
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.. code-block:: php
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<?php
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/**
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* @OneToOne(targetEntity="Customer")
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* @JoinColumn(name="customer_id", referencedColumnName="id")
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*/
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private $customer;
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.. _annref_joincolumns:
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@JoinColumns
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~~~~~~~~~~~~~~
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An array of @JoinColumn annotations for a
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:ref:`@ManyToOne <annref_manytoone>` or :ref:`@OneToOne <annref_onetoone>`
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relation with an entity that has multiple identifiers.
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.. _annref_jointable:
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@JoinTable
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~~~~~~~~~~~~~~
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Using :ref:`@OneToMany <annref_onetomany>` or
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:ref:`@ManyToMany <annref_manytomany>` on the owning side of the relation
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requires to specify the @JoinTable annotation which describes the
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details of the database join table. If you do not specify
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@JoinTable on these relations reasonable mapping defaults apply
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using the affected table and the column names.
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Required attributes:
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- **name**: Database name of the join-table
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- **joinColumns**: An array of @JoinColumn annotations describing the
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join-relation between the owning entities table and the join table.
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- **inverseJoinColumns**: An array of @JoinColumn annotations
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describing the join-relation between the inverse entities table and
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the join table.
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Example:
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.. code-block:: php
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<?php
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/**
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* @ManyToMany(targetEntity="Phonenumber")
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* @JoinTable(name="users_phonenumbers",
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* joinColumns={@JoinColumn(name="user_id", referencedColumnName="id")},
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* inverseJoinColumns={@JoinColumn(name="phonenumber_id", referencedColumnName="id", unique=true)}
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* )
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*/
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public $phonenumbers;
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.. _annref_manytoone:
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@ManyToOne
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~~~~~~~~~~~~~~
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Defines that the annotated instance variable holds a reference that
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describes a many-to-one relationship between two entities.
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Required attributes:
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- **targetEntity**: FQCN of the referenced target entity. Can be the
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unqualified class name if both classes are in the same namespace.
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*IMPORTANT:* No leading backslash!
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Optional attributes:
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- **cascade**: Cascade Option
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- **fetch**: One of LAZY or EAGER
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- inversedBy - The inversedBy attribute designates the field in
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the entity that is the inverse side of the relationship.
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Example:
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.. code-block:: php
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<?php
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/**
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* @ManyToOne(targetEntity="Cart", cascade={"all"}, fetch="EAGER")
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*/
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private $cart;
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.. _annref_manytomany:
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@ManyToMany
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~~~~~~~~~~~~~~
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Defines an instance variable holds a many-to-many relationship
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between two entities. :ref:`@JoinTable <annref_jointable>` is an
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additional, optional annotation that has reasonable default
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configuration values using the table and names of the two related
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entities.
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Required attributes:
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- **targetEntity**: FQCN of the referenced target entity. Can be the
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unqualified class name if both classes are in the same namespace.
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*IMPORTANT:* No leading backslash!
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Optional attributes:
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- **mappedBy**: This option specifies the property name on the
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targetEntity that is the owning side of this relation. Its a
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required attribute for the inverse side of a relationship.
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- **inversedBy**: The inversedBy attribute designates the field in the
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entity that is the inverse side of the relationship.
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- **cascade**: Cascade Option
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- **fetch**: One of LAZY, EXTRA_LAZY or EAGER
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- **indexBy**: Index the collection by a field on the target entity.
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.. note::
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For ManyToMany bidirectional relationships either side may
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be the owning side (the side that defines the @JoinTable and/or
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does not make use of the mappedBy attribute, thus using a default
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join table).
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Example:
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.. code-block:: php
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<?php
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/**
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* Owning Side
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*
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* @ManyToMany(targetEntity="Group", inversedBy="features")
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* @JoinTable(name="user_groups",
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* joinColumns={@JoinColumn(name="user_id", referencedColumnName="id")},
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* inverseJoinColumns={@JoinColumn(name="group_id", referencedColumnName="id")}
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* )
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*/
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private $groups;
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/**
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* Inverse Side
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*
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* @ManyToMany(targetEntity="User", mappedBy="groups")
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*/
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private $features;
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.. _annref_mappedsuperclass:
|
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@MappedSuperclass
|
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~~~~~~~~~~~~~~~~~~~~~
|
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An mapped superclass is an abstract or concrete class that provides
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persistent entity state and mapping information for its subclasses,
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but which is not itself an entity. This annotation is specified on
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the Class docblock and has no additional attributes.
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The @MappedSuperclass annotation cannot be used in conjunction with
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@Entity. See the Inheritance Mapping section for
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:doc:`more details on the restrictions of mapped superclasses <inheritance-mapping>`.
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.. _annref_onetoone:
|
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@OneToOne
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~~~~~~~~~~~~~~
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The @OneToOne annotation works almost exactly as the
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:ref:`@ManyToOne <annref_manytoone>` with one additional option that can
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be specified. The configuration defaults for
|
|
:ref:`@JoinColumn <annref_joincolumn>` using the target entity table and
|
|
primary key column names apply here too.
|
|
|
|
Required attributes:
|
|
|
|
|
|
- **targetEntity**: FQCN of the referenced target entity. Can be the
|
|
unqualified class name if both classes are in the same namespace.
|
|
*IMPORTANT:* No leading backslash!
|
|
|
|
Optional attributes:
|
|
|
|
|
|
- **cascade**: Cascade Option
|
|
- **fetch**: One of LAZY or EAGER
|
|
- **orphanRemoval**: Boolean that specifies if orphans, inverse
|
|
OneToOne entities that are not connected to any owning instance,
|
|
should be removed by Doctrine. Defaults to false.
|
|
- **inversedBy**: The inversedBy attribute designates the field in the
|
|
entity that is the inverse side of the relationship.
|
|
|
|
Example:
|
|
|
|
.. code-block:: php
|
|
|
|
<?php
|
|
/**
|
|
* @OneToOne(targetEntity="Customer")
|
|
* @JoinColumn(name="customer_id", referencedColumnName="id")
|
|
*/
|
|
private $customer;
|
|
|
|
.. _annref_onetomany:
|
|
|
|
@OneToMany
|
|
~~~~~~~~~~~~~~
|
|
|
|
Required attributes:
|
|
|
|
|
|
- **targetEntity**: FQCN of the referenced target entity. Can be the
|
|
unqualified class name if both classes are in the same namespace.
|
|
*IMPORTANT:* No leading backslash!
|
|
|
|
Optional attributes:
|
|
|
|
|
|
- **cascade**: Cascade Option
|
|
- **orphanRemoval**: Boolean that specifies if orphans, inverse
|
|
OneToOne entities that are not connected to any owning instance,
|
|
should be removed by Doctrine. Defaults to false.
|
|
- **mappedBy**: This option specifies the property name on the
|
|
targetEntity that is the owning side of this relation. Its a
|
|
required attribute for the inverse side of a relationship.
|
|
- **fetch**: One of LAZY, EXTRA_LAZY or EAGER.
|
|
- **indexBy**: Index the collection by a field on the target entity.
|
|
|
|
Example:
|
|
|
|
.. code-block:: php
|
|
|
|
<?php
|
|
/**
|
|
* @OneToMany(targetEntity="Phonenumber", mappedBy="user", cascade={"persist", "remove", "merge"}, orphanRemoval=true)
|
|
*/
|
|
public $phonenumbers;
|
|
|
|
.. _annref_orderby:
|
|
|
|
@OrderBy
|
|
~~~~~~~~~~~~~~
|
|
|
|
Optional annotation that can be specified with a
|
|
:ref:`@ManyToMany <annref_manytomany>` or :ref:`@OneToMany <annref_onetomany>`
|
|
annotation to specify by which criteria the collection should be
|
|
retrieved from the database by using an ORDER BY clause.
|
|
|
|
This annotation requires a single non-attributed value with an DQL
|
|
snippet:
|
|
|
|
Example:
|
|
|
|
.. code-block:: php
|
|
|
|
<?php
|
|
/**
|
|
* @ManyToMany(targetEntity="Group")
|
|
* @OrderBy({"name" = "ASC"})
|
|
*/
|
|
private $groups;
|
|
|
|
The DQL Snippet in OrderBy is only allowed to consist of
|
|
unqualified, unquoted field names and of an optional ASC/DESC
|
|
positional statement. Multiple Fields are separated by a comma (,).
|
|
The referenced field names have to exist on the ``targetEntity``
|
|
class of the ``@ManyToMany`` or ``@OneToMany`` annotation.
|
|
|
|
.. _annref_postload:
|
|
|
|
@PostLoad
|
|
~~~~~~~~~~~~~~
|
|
|
|
Marks a method on the entity to be called as a @PostLoad event.
|
|
Only works with @HasLifecycleCallbacks in the entity class PHP
|
|
DocBlock.
|
|
|
|
.. _annref_postpersist:
|
|
|
|
@PostPersist
|
|
~~~~~~~~~~~~~~
|
|
|
|
Marks a method on the entity to be called as a @PostPersist event.
|
|
Only works with @HasLifecycleCallbacks in the entity class PHP
|
|
DocBlock.
|
|
|
|
.. _annref_postremove:
|
|
|
|
@PostRemove
|
|
~~~~~~~~~~~~~~
|
|
|
|
Marks a method on the entity to be called as a @PostRemove event.
|
|
Only works with @HasLifecycleCallbacks in the entity class PHP
|
|
DocBlock.
|
|
|
|
.. _annref_postupdate:
|
|
|
|
@PostUpdate
|
|
~~~~~~~~~~~~~~
|
|
|
|
Marks a method on the entity to be called as a @PostUpdate event.
|
|
Only works with @HasLifecycleCallbacks in the entity class PHP
|
|
DocBlock.
|
|
|
|
.. _annref_prepersist:
|
|
|
|
@PrePersist
|
|
~~~~~~~~~~~~~~
|
|
|
|
Marks a method on the entity to be called as a @PrePersist event.
|
|
Only works with @HasLifecycleCallbacks in the entity class PHP
|
|
DocBlock.
|
|
|
|
.. _annref_preremove:
|
|
|
|
@PreRemove
|
|
~~~~~~~~~~~~~~
|
|
|
|
Marks a method on the entity to be called as a @PreRemove event.
|
|
Only works with @HasLifecycleCallbacks in the entity class PHP
|
|
DocBlock.
|
|
|
|
.. _annref_preupdate:
|
|
|
|
@PreUpdate
|
|
~~~~~~~~~~~~~~
|
|
|
|
Marks a method on the entity to be called as a @PreUpdate event.
|
|
Only works with @HasLifecycleCallbacks in the entity class PHP
|
|
DocBlock.
|
|
|
|
.. _annref_sequencegenerator:
|
|
|
|
@SequenceGenerator
|
|
~~~~~~~~~~~~~~~~~~~~~
|
|
|
|
For the use with @generatedValue(strategy="SEQUENCE") this
|
|
annotation allows to specify details about the sequence, such as
|
|
the increment size and initial values of the sequence.
|
|
|
|
Required attributes:
|
|
|
|
|
|
- **sequenceName**: Name of the sequence
|
|
|
|
Optional attributes:
|
|
|
|
|
|
- **allocationSize**: Increment the sequence by the allocation size
|
|
when its fetched. A value larger than 1 allows to optimize for
|
|
scenarios where you create more than one new entity per request.
|
|
Defaults to 10
|
|
- **initialValue**: Where does the sequence start, defaults to 1.
|
|
|
|
Example:
|
|
|
|
.. code-block:: php
|
|
|
|
<?php
|
|
/**
|
|
* @Id
|
|
* @GeneratedValue(strategy="SEQUENCE")
|
|
* @Column(type="integer")
|
|
* @SequenceGenerator(sequenceName="tablename_seq", initialValue=1, allocationSize=100)
|
|
*/
|
|
protected $id = null;
|
|
|
|
.. _annref_table:
|
|
|
|
@Table
|
|
~~~~~~~
|
|
|
|
Annotation describes the table an entity is persisted in. It is
|
|
placed on the entity-class PHP DocBlock and is optional. If it is
|
|
not specified the table name will default to the entities
|
|
unqualified classname.
|
|
|
|
Required attributes:
|
|
|
|
|
|
- **name**: Name of the table
|
|
|
|
Optional attributes:
|
|
|
|
|
|
- **indexes**: Array of @Index annotations
|
|
- **uniqueConstraints**: Array of @UniqueConstraint annotations.
|
|
|
|
Example:
|
|
|
|
.. code-block:: php
|
|
|
|
<?php
|
|
/**
|
|
* @Entity
|
|
* @Table(name="user",
|
|
* uniqueConstraints={@UniqueConstraint(name="user_unique",columns={"username"})},
|
|
* indexes={@Index(name="user_idx", columns={"email"})}
|
|
* )
|
|
*/
|
|
class User { }
|
|
|
|
.. _annref_uniqueconstraint:
|
|
|
|
@UniqueConstraint
|
|
~~~~~~~~~~~~~~~~~~~~~
|
|
|
|
Annotation is used inside the :ref:`@Table <annref_table>` annotation on
|
|
the entity-class level. It allows to hint the SchemaTool to
|
|
generate a database unique constraint on the specified table
|
|
columns. It only has meaning in the SchemaTool schema generation
|
|
context.
|
|
|
|
Required attributes:
|
|
|
|
|
|
- **name**: Name of the Index
|
|
- **columns**: Array of columns.
|
|
|
|
Example:
|
|
|
|
.. code-block:: php
|
|
|
|
<?php
|
|
/**
|
|
* @Entity
|
|
* @Table(name="ecommerce_products",uniqueConstraints={@UniqueConstraint(name="search_idx", columns={"name", "email"})})
|
|
*/
|
|
class ECommerceProduct
|
|
{
|
|
}
|
|
|
|
.. _annref_version:
|
|
|
|
@Version
|
|
~~~~~~~~~~~~~~
|
|
|
|
Marker annotation that defines a specified column as version
|
|
attribute used in an optimistic locking scenario. It only works on
|
|
:ref:`@Column <annref_column>` annotations that have the type integer or
|
|
datetime. Combining @Version with :ref:`@Id <annref_id>` is not supported.
|
|
|
|
Example:
|
|
|
|
.. code-block:: php
|
|
|
|
<?php
|
|
/**
|
|
* @column(type="integer")
|
|
* @version
|
|
*/
|
|
protected $version;
|
|
|