NAME¶
PX_insert_record — Inserts a new record in the Paradox file
SYNOPSIS¶
#include <paradox.h>
int PX_insert_record(pxdoc_t *pxdoc, pxval_t **dataptr)
DESCRIPTION¶
Inserts a new record stored in the array
dataptr into a Paradox file.
The position of the record will be determined by the function itself, starting
at the beginning of the file and searching towards the end for a free slot. A
free slot can be the result of former calls of
PX_delete_record(3) or
not completely filled data blocks in the input file. If there is no free slot
within the file, then a new record will be added at the end.
Blobs will be automatically written if a blob file was set with
PX_set_blob_file(3).
The memory for
dataptr and the field values can be freed after
PX_insert_record has been called.
Each single element in the array of pointers to pxval_t can be easily created
with
MAKE_PXVAL(pxdoc_t *pxdoc, pxval_t *val) and setting the actual
value afterwards. A quite common way to build up the record is the following:
dataptr = (pxval_t **) malloc(PX_get_num_fields(pxdoc)*sizeof(pxval_t *));
MAKE_PXVAL(pxdoc, dataptr[0]);
dataptr[0]->type = pxfLong;
dataptr[0]->value.lval = 45;
dataptr[1]->type = pxfAlpha;
dataptr[1]->value.str.val = "test";
dataptr[1]->value.str.len = 4;
PX_insert_record(pxdoc, dataptr);
free(dataptr[0]);
free(dataptr[1]);
free(dataptr);
There is currently no need to set the type, though it is recommended.
The field types pxfMemoBLOb and pxfFmtMemoBLOb are treated like strings.
Fields of type pxfAutoInc are automatically incremented if its value is set to
NULL. In such a case the value is taken from the header of the database. You
should not have more than one field of type pxfAutoInc in your database,
otherwise the automatic incrementation will not work.
RETURN VALUE¶
Returns the record number on success or -1 on failure. The number of the first
record is 0.
SEE ALSO¶
PX_retrieve_record(3),
PX_delete_record(3),
PX_update_record(3)
AUTHOR¶
This manual page was written by Uwe Steinmann uwe@steinmann.cx.