PX_RETRIEVE_RECORD
DESCRIPTION
Returns the record with the given number in a Paradox file. The first record has number 0, the last one has number_of_records-1.
If you are accessing several records, do it in ascending order, because this is the most efficient way.
The return value is an array of field values. Each value is stored in a structure like the following:
typedef struct px_val pxval_t;
struct px_val {
char isnull;
int type;
union {
long lval;
double dval;
struct {
char *val;
int len;
} str;
} value;
};
The element isnull is set to 1 if the
value is NULL otherwise it is set to 0. type
is the type of the paradox field as defined in
paradox.h.
A field value can be either a long int, a double or a string, depending
on the paradox field type. The paradox field types pxfShort, pxfLong,
pxfDate, pxfTime, pxfLogical, and pxfAutoInc are returned as long int
values.
pxfTimestamp, pxfNumber, and pxfCurrency are returned as double values
and all remaining paradox field types are stored as strings with the length
in value.len. You can rely on strings being Null
terminated. Blobs are stored as string but are not guarented to be
Null terminated.
The paradox field types pxfTimestamp, pxfTime, an pxfDate use an
uncommon format which can be converted into a string with
PX_timestamp2string(3),
PX_time2string(3), and
PX_date2string(3).
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.