Property inspector for an modelled attribute

DefaultDbValue

Initial value used when evolving the database or creating the database.

This value should be in the format expected by the database engine. For example 0 or 1 for a boolean using SQL Server.

Should be 'stringvalue' for a string default value.

Initial value

Initial value used in-memory.

Should be true/false or nothing for null (if nullable) or other value depending on type of attribute.

Allow Null

Controls both the in-memory nullability and database attribute setting.

If this is false, most database engines require a DefaultDbValue to evolve the database. If no value is provided, the existing rows (objects) in database will get an invalid value and the evolve will fail.