NAME¶
XBase::Base - Base input output module for XBase suite
SYNOPSIS¶
Used indirectly, via XBase or XBase::Memo.
DESCRIPTION¶
This module provides catch-all I/O methods for other XBase classes, should be
used by people creating additional XBase classes/methods. There is nothing
interesting in here for users of the
XBase(3) module. Methods in
XBase::Base return nothing (undef) on error and the error message can be
retrieved using the
errstr method.
Methods are:
- new
- Constructor. Creates the object and if the file name is
specified, opens the file.
- open
- Opens the file and using method read_header reads the
header and sets the object's data structure. The read_header should be
defined in the derived class, there is no default.
- close
- Closes the file, doesn't destroy the object.
- drop
- Unlinks the file.
- create_file
- Creates file of given name. Second (optional) parameter is
the permission specification for the file.
The reading/writing methods assume that the file has got header of length
header_len bytes (possibly 0) and then records of length record_len. These two
values should be set by the read_header method.
- seek_to, seek_to_record
- Seeks to absolute position or to the start of the
record.
- read_record, read_from
- Reads data from specified position (offset) or from the
given record. The second parameter (optional for read_record) is
the length to read. It can be negative, and at that case the read will not
complain if the file is shorter than requested.
- write_to, write_record
- Writes data to the absolute position or to specified record
position. The data is not padded to record_len, just written out.
General locking methods are
locksh,
lockex and
unlock, they
call
_locksh,
_lockex and
_unlock which can be redefined
to allow any way for locking (not only the default flock). The user is
responsible for calling the lock if he needs it.
No more description -- check the source code if you need to know more.
VERSION¶
1.02
AVAILABLE FROM¶
http://www.adelton.com/perl/DBD-XBase/
AUTHOR¶
(c) 1997--2011 Jan Pazdziora.
SEE ALSO¶
perl(1),
XBase(3)