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/* File: tuple.h
*
* Description: See "tuple.c"
*
* Important NOTE: The TupleField structure is used both to hold backend data and
* manual result set data. The "set_" functions and the TupleNode
* structure are only used for manual result sets by info routines.
*
* Comments: See "notice.txt" for copyright and license information.
*
*/
#ifndef __TUPLE_H__
#define __TUPLE_H__
#include "psqlodbc.h"
/* Used by backend data AND manual result sets */
struct TupleField_ {
Int4 len; /* length of the current Tuple */
void *value; /* an array representing the value */
};
/* Used ONLY for manual result sets */
struct TupleNode_ {
struct TupleNode_ *prev, *next;
TupleField tuple[1];
};
/* These macros are wrappers for the corresponding set_tuplefield functions
but these handle automatic NULL determination and call set_tuplefield_null()
if appropriate for the datatype (used by SQLGetTypeInfo).
*/
#define set_nullfield_string(FLD, VAL) ((VAL) ? set_tuplefield_string(FLD, (VAL)) : set_tuplefield_null(FLD))
#define set_nullfield_int2(FLD, VAL) ((VAL) != -1 ? set_tuplefield_int2(FLD, (VAL)) : set_tuplefield_null(FLD))
#define set_nullfield_int4(FLD, VAL) ((VAL) != -1 ? set_tuplefield_int4(FLD, (VAL)) : set_tuplefield_null(FLD))
void set_tuplefield_null(TupleField *tuple_field);
void set_tuplefield_string(TupleField *tuple_field, char *string);
void set_tuplefield_int2(TupleField *tuple_field, Int2 value);
void set_tuplefield_int4(TupleField *tuple_field, Int4 value);
#endif
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