PX_GET_RECORD2
Synopsis
#include <paradox.h>
int PX_get_record2(pxdoc_t *pxdoc, int recno, char *data, int *deleted, pxdatablockinfo_t *pxdbinfo)
DESCRIPTION
This function is similar to PX_get_record(3) but takes two extra parameters. If *deleted is set to 1 the function will consider any record in the database, even those which are deleted. If *pxdbinfo is not NULL, the function will return some information about the data block where the record has been read from. You will have to allocate memory for pxdbinfo before calling PX_get_record2.
On return *deleted will be set to 1 if the requested record is deleted or 0 if it is not deleted. The struct pxdatablockinfo_t has the following fields:
- blockpos (long)
File positon where the block starts. The first six bytes of the block contain the header, followed by the record data.
- recordpos (long)
File position where the requested record starts.
- size (int)
Size of the data block without the six bytes for the header.
- recno (int)
Record number within the data block. The first record in the block has number 0.
- numrecords (int)
The number of records in this block.
- number (int)
The number of the data block.
This function may return records with invalid data, because records are not explizitly marked as deleted, but rather the size of a valid data block is modified. A data block is a fixed size area in the file which holds a certain number of records. If for some reason a data block has newer been completely filled with records, the algorithmn anticipates deleted records in this data block, which are not there. This often happens with the last data block in a file, which is likely to not being fully filled with records.
If you accessing several records, do it in ascending order, because this is the most efficient way.
 | This function is deprecated.
Use |
Latest News
Released version 0.6.6April 07, 2016
This release fixes some more typos in the documentation.
Released version 0.6.5Jannuary 11, 2012
pxlib isn't dead, its development has just slowed down. This release fixes some typos and optimizes the configuration process.
Released version 0.6.2September 19, 2007
This one fixes a long lasting bug on 64 bit architectures. It also is compilable in a mingw environment and Visual C++ with the help of cmake.
Released version 0.6.1March 29, 2006
There were some bugs related to the changes of the last release. This version fixes them. Besides that the following has changed:
- Much better support for secondary indexes
- PX_insert_record() and PX_update_record() treat null values propperly
- PX_delete_record() now updates the internal index without corrupting it.
- Various man page updates.
- Auto increment fields of type pxfAutoInc.
- Fixed some compile errors and warnings.
- Fixed various small bugs and memory leaks.
February 6, 2006
This version includes some major changes to the api while retaining compatible to older versions. If you use the new functions expect bugs but also a much simplier record handling.
- Databases can be read and written after opening with PX_open_xxx()
- Use a cache for reading encrypted blobs
- Added new functions PX_delete_record(), PX_update_record(), PX_insert_record(), PX_retrieve_record()
- reading and writing encrypted blob files is more efficient.
- No more than 64 blobs will be stored in blocks of type 3
- Fixed various small bugs and memory leaks.
August 11, 2005
- fixed bug when reading header of blob (Thanks to Giovanni Giacobbi)
- fixes bug when reading blobs of a certain size from an encrypted .mb file.
- reading and writing encrypted blob files is more efficient.
July 14, 2005
- support for encrypted databases and blob files
02 Feb 05
After a long time the web site has been overhauled with much more information about pxlib.