pg_on_connection_loss dbHandle callbackCommand
Specifies a valid database handle.
If present, provides the command string to execute when connection loss is detected.
changes, or cancels a request to execute a callback command if an
unexpected loss of connection to the database occurs. With a
callbackCommand parameter, the
request is established, or the command string of an already
existing request is replaced. With no
callbackCommand parameter, a prior request is
The callback command string is executed from the Tcl idle
loop. That is the normal idle state of an application written
with Tk. In non-Tk Tcl shells, you can execute
to cause the idle loop to be entered.