MDAC 2.5 SDK - ODBC Programmer's Reference
Chapter 3: ODBC Architecture

Driver Tasks

Specific tasks performed by drivers include:

• Connecting to and disconnecting from the data source.
  
  
• Checking for function errors not checked by the Driver Manager.
  
  
• Initiating transactions; this is transparent to the application.
  
  
• Submitting SQL statements to the data source for execution. The driver must modify ODBC SQL to DBMS-specific SQL; this is often limited to replacing escape clauses defined by ODBC with DBMS-specific SQL.
  
  
• Sending data to and retrieving data from the data source, including converting data types as specified by the application.
  
  
• Mapping DBMS-specific errors to ODBC SQLSTATEs.