| public static GetComputedColumnName ( string implementationName ) : string | ||
| implementationName | string | |
| return | string | |
/// <summary>
/// Same subtype may implement same supertype multiple time. Since ID of the supertype is usually same as subtype's ID,
/// that might result with multiple supertype records with the same ID. To avoid duplicate IDs and still keep the
/// deterministic ID values, the supertype's ID is XORed by a hash code taken from the ImplementationName.
/// </summary>
private string GetSubtypeImplementationIdSnippet()
{
if (IsSubtypeOf.ImplementationName == "")
{
return("");
}
else if (IsSubtypeOf.SupportsPersistedSubtypeImplementationColum())
{
return(",\r\n SubtypeImplementationID = " + PersistedSubtypeImplementationIdInfo.GetComputedColumnName(IsSubtypeOf.ImplementationName));
}
else
{
int hash = DomUtility.GetSubtypeImplementationHash(IsSubtypeOf.ImplementationName);
return(",\r\n SubtypeImplementationID = CONVERT(UNIQUEIDENTIFIER, CONVERT(BINARY(4), CONVERT(INT, CONVERT(BINARY(4), ID)) ^ " + hash + ") + SUBSTRING(CONVERT(BINARY(16), ID), 5, 12))");
}
}
