Restrictions on the Use of Datatypes

SourcePro : DB Access Module for Sybase User’s Guide : Technical Information : Datatypes : Restrictions on the Use of Datatypes

Sybase Open Client Client-Library and Sybase Adaptive Server Enterprise place restrictions on the use of certain datatypes. Where possible, the DB Interface Module is flexible about datatypes. However, there are some situations where conversions are not possible, and in these cases your application must be aware of the contexts in which certain datatypes can be used. Table 3 outlines the restrictions associated with each DB Interface Module type.

Table 3 – Restrictions on the use of DB Interface Module datatypes
RWDBValue::ValueType	Restrictions
Char UnsignedChar	No restrictions
String WString MBString UString	Not supported on RWDBBoundExpr if string size is bigger than 16384 bytes
Blob	Not supported on RWDBBoundExpr
Short UnsignedShort	No restrictions
Int UnsignedInt	No restrictions
Long UnsignedLong	No restrictions
Double	No restrictions
Float	No restrictions
Decimal	The precision and scale of a value can vary depending on the version of the Sybase client and server. Consistent versions of clients and servers can eliminate difficulties in conversions.
Date	No restrictions
DateTime	Supports dates ranging from January 1, 1753 through December 31, 9999, 23:59:59.999. However, accuracy is limited to 3.33 milliseconds by Sybase. Therefore, the maximum date that could be inserted is December 31, 9999, 23:59:59.996.
TimeTuple	No restrictions
TimeTupleOffset	Not supported
Duration	Not supported by the Sybase client
LongLong UnsignedLongLong	Table creation not supported
LongDouble	No restrictions