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Entity Data Model: Primitive Data Types

The Entity Data Model (EDM) supports a set of abstract primitive data types (such as String, Boolean, Int32, and so on) that are used to define properties in a conceptual model. These primitive data types are proxies for actual primitive data types that are supported in the storage or hosting environment, such as a SQL Server database or the common language runtime (CLR). The EDM does not define the semantics of operations or conversions over primitive data types; these semantics are defined by the storage or hosting environment. Typically, primitive data types in the EDM are mapped to corresponding primitive data types in the storage or hosting environment. For information about how the Entity Framework maps primitive types in the EDM to SQL Server data types, see SqlClient for Entity FrameworkTypes.

noteNote:
The EDM does not support collections of primitive data types.

For information about structured data types in the EDM, see entity type and complex type.

Primitive Data Types Supported in the Entity Data Model

The table below lists the primitive data types supported by the EDM. The table also lists the facets that can be applied to each primitive data type.

 

Primitive Data Type Description Applicable Facets

Binary

Contains binary data.

MaxLength, FixedLength, Nullable, Default

Boolean

Contains the value true or false.

Nullable, Default

Byte

Contains an unsigned 8-bit integer value.

Precision, Nullable, Default

DateTime

Represents a date and time.

Precision, Nullable, Default

DateTimeOffset

Contains a date and time as an offset in minutes from GMT.

Precision, Nullable, Default

Decimal

Contains a numeric value with fixed precision and scale.

Precision, Nullable, Default

Double

Contains a floating point number with 15 digit precision.

Precision, Nullable, Default

Float

Contains a floating point number with seven digit precision.

Precision, Nullable, Default

Guid

Contains a 16-byte unique identifier.

Precision, Nullable, Default

Int16

Contains a signed 16-bit integer value.

Precision, Nullable, Default

Int32

Contains a signed 32-bit integer value.

Precision, Nullable, Default

Int64

Contains a signed 64-bit integer value.

Precision, Nullable, Default

SByte

Contains a signed 8-bit integer value.

Precision, Nullable, Default

String

Contains character data.

Unicode, FixedLength, MaxLength, Collation, Precision, Nullable, Default

Time

Contains a time of day.

Precision, Nullable, Default

See Also




Build Date:

2012-08-02
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