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Built-In Attributes

Built-in attributes allow you to provide detailed mapping information to XPO for .NET and thus address any business requirement. The table below lists all the attributes provided by XPO.

Attribute Description
AggregatedAttribute Indicates that persistent objects referenced by the target property are aggregated.
AssociationAttribute Identifies the end of an association that is involved in an object relationship.
ColumnDbDefaultValueAttribute Applied to persistent class' fields or properties. Specifies the SQL expression representing the default value of the database column mapped to the target property/field.
ColumnDefaultValueAttribute Applied to persistent class' fields or properties. Specifies the default value of the database column mapped to the target property/field.
CustomAttribute Specifies a custom attribute for a class or a class member.
DbTypeAttribute Specifies the database type of the column that a property is mapped to.
DefaultMembersPersistence Lists the values that determine which members are implied as persistent by default.
DeferredDeletionAttribute Enables deferred object deletion.
DelayedAttribute Indicates that the property's value should not be loaded when a persistent object is being loaded. The property will be loaded the first time it is accessed.
DisplayNameAttribute Specifies the member's display name.
ExplicitLoadingAttribute Specifies that the information used to retrieve persistent objects that are referenced by the current property, is included in a query used to load this property.
IndexedAttribute Indicates that a property or field participates in index creation.
IndicesAttribute Specifies the properties that participate in creation of non-unique database indices.
KeyAttribute Indicates that a property or a field is a key.
MapInheritanceAttribute Specifies the type of object-relational inheritance mapping for the class.
MapToAttribute Specifies the name of the database object where the class will be mapped.
MemberDesignTimeVisibilityAttribute Specifies whether a property or class is visible at design time.
NoForeignKeyAttribute Disables automatic creation of the FOREIGN KEY constraints.
NonPersistentAttribute Indicates that a class, property, or field will not be stored in a persistent data store.
NullableAttribute Applies to persistent class' fields or properties. Specifies if a nullable column should be created when updating the database schema for the target property/field.
NullableBehaviorAttribute Applied to persistent classes. Specifies if nullable columns should be created when updating the database schema for the target class.
NullValueAttribute Associates a constant with the null value of a property or a field of a simple type.
OptimisticLockingAttribute Specifies that a persistent object's state can be locked during a session.
PersistentAliasAttribute Indicates that a property is not persistent and its value is calculated based upon the values of a specific field(s).
PersistentAttribute Indicates that a property, field or class will be stored in a persistent data store and specifies the target column or table name.
SizeAttribute Specifies the maximum number of characters that can be stored in a column which is created to store the data of a property or field.
ValueConverterAttribute Specifies that a property is made persistent using a Value Converter.