Informix using CONNECT, COMMIT, DISCONNECT, and ROLLBACK – PB Docs 2019

CONNECT

Establishes the database connection. After you assign
values to the required properties of the transaction object, you
can execute a CONNECT. After this call completes successfully,
PowerBuilder issues a BEGIN WORK to start a logical unit of work
for the transaction.

COMMIT

Terminates the logical unit of work, guarantees that
all changes made to the database since the beginning of the
current unit of work become permanent, and starts a new logical
unit of work.

DISCONNECT

Terminates a successful connection. DISCONNECT
automatically executes a COMMIT to guarantee that all changes made
to the database since the beginning of the current unit of work
are committed.

ROLLBACK

Terminates a logical unit of work, undoes all changes
made to the database since the beginning of the logical unit of
work, and starts a new logical unit of work.