postgresql/src/include/access/tupdesc.h

/*-------------------------------------------------------------------------
 *
 * tupdesc.h--
 *    POSTGRES tuple descriptor definitions.
 *
 *
 * Copyright (c) 1994, Regents of the University of California
 *
 * $Id: tupdesc.h,v 1.7 1997/08/21 04:10:25 vadim Exp $
 *
 *-------------------------------------------------------------------------
 */
#ifndef	TUPDESC_H
#define TUPDESC_H

#include <nodes/pg_list.h>
#include <access/attnum.h>
#include <catalog/pg_attribute.h>


typedef struct attrDefault {
    AttrNumber		adnum;
    char		*adbin;
    char		*adsrc;
} AttrDefault;

typedef struct constrCheck {
    char		*ccname;
    char		*ccbin;
    char		*ccsrc;
} ConstrCheck;

/* This structure contains constraints of a tuple */
typedef struct tupleConstr {
    AttrDefault		*defval;
    ConstrCheck		*check;
    uint16		num_defval;
    uint16		num_check;
    bool		has_not_null;
} TupleConstr;

/*
 * This structure contains all information (i.e. from Classes
 * pg_attribute, pg_attrdef, pg_relcheck) for a tuple. 
 */
typedef struct tupleDesc {
    int  natts;      
      /* Number of attributes in the tuple */
    AttributeTupleForm *attrs;
      /* attrs[N] is a pointer to the description of Attribute Number N+1.  */
    TupleConstr *constr;
} *TupleDesc;

extern TupleDesc CreateTemplateTupleDesc(int natts);

extern TupleDesc CreateTupleDesc(int natts, AttributeTupleForm *attrs);

extern TupleDesc CreateTupleDescCopy(TupleDesc tupdesc);

extern bool TupleDescInitEntry(TupleDesc desc,
			       AttrNumber attributeNumber,
			       char *attributeName, 
			       char *typeName, 
			       int attdim, 
			       bool attisset);

extern TupleDesc BuildDescForRelation(List *schema, char *relname);

#endif	/* TUPDESC_H */