Microsoft SQL Server Compact Edition Data Types Mapping

XPO creates these column types when updating the Microsoft SQL Server Compact Edition database schema and expects them in existing databases.

.NET Type Database Column Type
Boolean bit
Byte tinyint
SByte numeric(3,0)
Char nchar(1)
Decimal numeric(19,4)
Double float
Single real
Int16 smallint
UInt16 numeric(5,0)
Int32 int
UInt32 numeric(10,0)
Int64 bigint
UInt64 numeric(20,0)
Guid uniqueidentifier
String nvarchar
DateTime datetime
TimeSpan float
Byte[] image or varbinary(N)
Unlimited size string ntext

Mapping Properties To Database Column Types Not Supported By Default

If a column type is not listed in the above table but can be converted to any of the listed type by the database, it can be read and modified by XPO. To create a column of a specific type in the database when updating the schema, decorate the property with DbTypeAttribute. If a column type cannot be converted to a supported type, it is possible to support such columns by creating a custom connection provider. Here are some examples:

See Also