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PX_RETRIEVE_RECORD

PX_RETRIEVE_RECORD

Section: C Library Functions (3)
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NAME

PX_retrieve_record --- Returns record in Paradox file  

SYNOPSIS

#include <paradox.h>

pxval_t ** PX_retrieve_record(pxdoc_t *pxdoc, int recno)  

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).  

RETURN VALUE

Returns a pointer on success and NULL on failure.  

SEE ALSO

PX_update_record(3), PX_timestamp2string(3), PX_time2string(3), PX_date2string(3)               
 

AUTHOR

This manual page was written by Uwe Steinmann uwe@steinmann.cx.


 

Index

NAME
SYNOPSIS
DESCRIPTION
RETURN VALUE
SEE ALSO
AUTHOR

This document was created by man2html, using the manual pages.
Time: 21:53:23 GMT, April 16, 2011