GIF89a;
EcchiShell v1.0
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pgsql/
= 0 to allow the rowtype to be looked up in the
* typcache.c type cache.
*
* Tuple descriptors that live in caches (relcache or typcache, at present)
* are reference-counted: they can be deleted when their reference count goes
* to zero. Tuple descriptors created by the executor need no reference
* counting, however: they are simply created in the appropriate memory
* context and go away when the context is freed. We set the tdrefcount
* field of such a descriptor to -1, while reference-counted descriptors
* always have tdrefcount >= 0.
*/
typedef struct tupleDesc
{
int natts; /* number of attributes in the tuple */
Form_pg_attribute *attrs;
/* attrs[N] is a pointer to the description of Attribute Number N+1 */
TupleConstr *constr; /* constraints, or NULL if none */
Oid tdtypeid; /* composite type ID for tuple type */
int32 tdtypmod; /* typmod for tuple type */
bool tdhasoid; /* tuple has oid attribute in its header */
int tdrefcount; /* reference count, or -1 if not counting */
} *TupleDesc;
/* Accessor for the i'th attribute of tupdesc. */
#define TupleDescAttr(tupdesc, i) ((tupdesc)->attrs[(i)])
extern TupleDesc CreateTemplateTupleDesc(int natts, bool hasoid);
extern TupleDesc CreateTupleDesc(int natts, bool hasoid,
Form_pg_attribute *attrs);
extern TupleDesc CreateTupleDescCopy(TupleDesc tupdesc);
extern TupleDesc CreateTupleDescCopyConstr(TupleDesc tupdesc);
extern void FreeTupleDesc(TupleDesc tupdesc);
extern void IncrTupleDescRefCount(TupleDesc tupdesc);
extern void DecrTupleDescRefCount(TupleDesc tupdesc);
#define PinTupleDesc(tupdesc) \
do { \
if ((tupdesc)->tdrefcount >= 0) \
IncrTupleDescRefCount(tupdesc); \
} while (0)
#define ReleaseTupleDesc(tupdesc) \
do { \
if ((tupdesc)->tdrefcount >= 0) \
DecrTupleDescRefCount(tupdesc); \
} while (0)
extern bool equalTupleDescs(TupleDesc tupdesc1, TupleDesc tupdesc2);
extern void TupleDescInitEntry(TupleDesc desc,
AttrNumber attributeNumber,
const char *attributeName,
Oid oidtypeid,
int32 typmod,
int attdim);
extern void TupleDescInitEntryCollation(TupleDesc desc,
AttrNumber attributeNumber,
Oid collationid);
extern TupleDesc BuildDescForRelation(List *schema);
extern TupleDesc BuildDescFromLists(List *names, List *types, List *typmods, List *collations);
#endif /* TUPDESC_H */