Command Name  | 
Level  | 
Purpose  | 
Core  | 
Obtains an environment handle. One environment handle is used for one or more connections.  | 
|
Core  | 
Obtains a connection handle.  | 
|
Core  | 
Connects to a specific driver by data source name, user id, and password.  | 
|
Level 1  | 
Connects to a specific driver by connection string or requests that the Driver Manager and driver display connection dialog boxes for the user.  | 
|
Level 2  | 
Returns successive levels of connection attributes and valid attribute values. When a value has been specified for each connection attribute, connects to the data source.  |