UniBasic Commands Reference - Rocket Software

Parameters
The following table describes each parameter of the syntax.
Parameter Description
dyn.array.var Specifies a target dynamic array to receive the data read.
FROM file.var Specifies a file variable from which to read the record.
If you do not specify a file.var, UniData reads from the default
file. If no default file is open, a fatal error occurs.
The default file is one for which no file variable is assigned in
the OPEN statement.
ON ERROR statements Specifies statements to execute if the READBCKL statement
fails with a fatal error because the file is not open, an I/O error
occurs, or UniData cannot find the file.
If you do not specify the ON ERROR clause and a fatal error
occurs, the program terminates.
LOCKED statements Specifies statements to execute if the record is already locked.
If you do not specify the LOCKED clause, and if the record is
locked, UniData waits until the record is available.
Use the ECL command DEFAULT.LOCKED.ACTION BELL
to make the terminal beep while you wait for UniData to
unlock the record.
THEN statements END THEN executes if the read is not successful. END is required
to terminate multiline THEN statements.
ELSE statements END ELSE executes if the read is not successful, the current
alternate key value is not set by the SETINDEX command, or
UniData cannot locate the current alternate key value (for
example, when UniData reaches the end of the alternate
index). END is required to terminate multiline ELSE
statements.
READBCKL Parameters
READBCKL 1-603