1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
|
/*-------------------------------------------------------------------------
*
* datum.h
* POSTGRES Datum (abstract data type) manipulation routines.
*
* These routines are driven by the 'typbyval' and 'typlen' information,
* which must previously have been obtained by the caller for the datatype
* of the Datum. (We do it this way because in most situations the caller
* can look up the info just once and use it for many per-datum operations.)
*
* Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: datum.h,v 1.14 2001/10/25 05:50:10 momjian Exp $
*
*-------------------------------------------------------------------------
*/
#ifndef DATUM_H
#define DATUM_H
/*
* datumGetSize - find the "real" length of a datum
*/
extern Size datumGetSize(Datum value, bool typByVal, int typLen);
/*
* datumCopy - make a copy of a datum.
*
* If the datatype is pass-by-reference, memory is obtained with palloc().
*/
extern Datum datumCopy(Datum value, bool typByVal, int typLen);
/*
* datumFree - free a datum previously allocated by datumCopy, if any.
*
* Does nothing if datatype is pass-by-value.
*/
extern void datumFree(Datum value, bool typByVal, int typLen);
/*
* datumIsEqual
* return true if two datums of the same type are equal, false otherwise.
*
* XXX : See comments in the code for restrictions!
*/
extern bool datumIsEqual(Datum value1, Datum value2,
bool typByVal, int typLen);
#endif /* DATUM_H */
|
