DataWindow Designer can access many data sources for which ODBC-compliant drivers exist. However, ODBC drivers manufactured by different vendors might vary widely in the functions they provide.
To ensure a standard level of compliance with the ODBC interface, and to provide a means by which application vendors can determine whether a specific driver provides the functions they need, ODBC defines conformance levels for drivers in two areas:
ODBC defines three API conformance levels, in order of increasing functionality:
Core A set of core API functions that corresponds to the functions in the ISO Call Level Interface (CLI) and X/Open CLI specification
Level 1 Includes all Core API functions and several extended functions usually available in an OLTP relational DBMS
Level 2 Includes all Core and Level 1 API functions and additional extended functions
To ensure the proper ODBC driver API conformance
level:
Sybase recommends that the ODBC drivers you use with DataWindow Designer meet Level 1 or higher API conformance requirements. However, DataWindow Designer might also work with drivers that meet Core level API conformance requirements.
ODBC defines three SQL grammar conformance levels, in order of increasing functionality:
Minimum A set of SQL statements and datatypes that meets a basic level of ODBC conformance
Core Includes all Minimum SQL grammar and additional statements and datatypes that roughly correspond to the X/Open and SAG CAE specification (1992)
Extended Includes all Minimum and Core SQL grammar and an extended set of statements and datatypes that support common DBMS extensions to SQL
To ensure the proper ODBC driver SQL conformance
level:
Sybase recommends that the ODBC drivers you use with DataWindow Designer meet Core or higher SQL conformance requirements. However, DataWindow Designer might also work with drivers that meet Minimum level SQL conformance requirements.
