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264c068207
for views. Views are now have a "relkind" of
RELKIND_VIEW instead of RELKIND_RELATION.
Also, views no longer have actual heap storage
files.
The following changes were made
1. CREATE VIEW sets the new relkind
2. The executor complains if a DELETE or
INSERT references a view.
3. DROP RULE complains if an attempt is made
to delete a view SELECT rule.
4. CREATE RULE "_RETmytable" AS ON SELECT TO mytable DO INSTEAD ...
1. checks to make sure mytable is empty.
2. sets the relkind to RELKIND_VIEW.
3. deletes the heap storage files.
5. LOCK myview is not allowed. :)
6. the regression test type_sanity was changed to
account for the new relkind value.
7. CREATE INDEX ON myview ... is not allowed.
8. VACUUM myview is not allowed.
VACUUM automatically skips views when do the entire
database.
9. TRUNCATE myview is not allowed.
THINGS LEFT TO THINK ABOUT
o pg_views
o pg_dump
o pgsql (\d \dv)
o Do we really want to be able to inherit from views?
o Is 'DROP TABLE myview' OK?
--
Mark Hollomon
183 lines
6.2 KiB
C
183 lines
6.2 KiB
C
/*-------------------------------------------------------------------------
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*
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* pg_class.h
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* definition of the system "relation" relation (pg_class)
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* along with the relation's initial contents.
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*
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*
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* Portions Copyright (c) 1996-2000, PostgreSQL, Inc
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* $Id: pg_class.h,v 1.40 2000/09/12 04:49:15 momjian Exp $
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*
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* NOTES
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* the genbki.sh script reads this file and generates .bki
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* information from the DATA() statements.
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef PG_CLASS_H
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#define PG_CLASS_H
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/* ----------------
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* postgres.h contains the system type definintions and the
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* CATALOG(), BOOTSTRAP and DATA() sugar words so this file
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* can be read by both genbki.sh and the C compiler.
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* ----------------
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*/
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/* ----------------
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* pg_class definition. cpp turns this into
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* typedef struct FormData_pg_class
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*
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* Note: the #if 0, #endif around the BKI_BEGIN.. END block
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* below keeps cpp from seeing what is meant for the
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* genbki script
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* ----------------
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*/
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/* ----------------
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* This structure is actually variable-length (the last attribute is
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* a POSTGRES array). Hence, sizeof(FormData_pg_class) does not
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* necessarily match the actual length of the structure. Furthermore
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* relacl may be a NULL field. Hence, you MUST use heap_getattr()
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* to get the relacl field ... and don't forget to check isNull.
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* ----------------
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*/
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CATALOG(pg_class) BOOTSTRAP
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{
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NameData relname;
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Oid reltype;
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int4 relowner;
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Oid relam;
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int4 relpages;
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int4 reltuples;
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Oid reltoastrelid;
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Oid reltoastidxid;
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bool relhasindex;
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bool relisshared;
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char relkind;
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int2 relnatts;
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/*
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* relnatts is the number of user attributes this class has. There
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* must be exactly this many instances in Class pg_attribute for this
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* class that have attnum > 0 (= user attribute).
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*/
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int2 relchecks; /* # of CHECK constraints for class */
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int2 reltriggers; /* # of TRIGGERs */
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int2 relukeys; /* # of Unique keys */
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int2 relfkeys; /* # of FOREIGN KEYs */
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int2 relrefs; /* # of references to this rel (not used!) */
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bool relhaspkey; /* has PRIMARY KEY */
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bool relhasrules; /* has associated rules */
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bool relhassubclass; /* has derived classes */
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/*
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* relacl may or may not be present, see note above!
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*/
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aclitem relacl[1]; /* we declare this just for the catalog */
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} FormData_pg_class;
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/* Size of fixed part of pg_class tuples, not counting relacl or padding */
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#define CLASS_TUPLE_SIZE \
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(offsetof(FormData_pg_class,relhassubclass) + sizeof(bool))
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/* ----------------
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* Form_pg_class corresponds to a pointer to a tuple with
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* the format of pg_class relation.
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* ----------------
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*/
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typedef FormData_pg_class *Form_pg_class;
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/* ----------------
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* compiler constants for pg_class
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* ----------------
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*/
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/* ----------------
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* Natts_pg_class_fixed is used to tell routines that insert new
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* pg_class tuples (as opposed to replacing old ones) that there's no
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* relacl field.
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* ----------------
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*/
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#define Natts_pg_class_fixed 20
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#define Natts_pg_class 21
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#define Anum_pg_class_relname 1
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#define Anum_pg_class_reltype 2
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#define Anum_pg_class_relowner 3
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#define Anum_pg_class_relam 4
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#define Anum_pg_class_relpages 5
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#define Anum_pg_class_reltuples 6
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#define Anum_pg_class_reltoastrelid 7
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#define Anum_pg_class_reltoastidxid 8
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#define Anum_pg_class_relhasindex 9
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#define Anum_pg_class_relisshared 10
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#define Anum_pg_class_relkind 11
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#define Anum_pg_class_relnatts 12
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#define Anum_pg_class_relchecks 13
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#define Anum_pg_class_reltriggers 14
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#define Anum_pg_class_relukeys 15
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#define Anum_pg_class_relfkeys 16
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#define Anum_pg_class_relrefs 17
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#define Anum_pg_class_relhaspkey 18
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#define Anum_pg_class_relhasrules 19
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#define Anum_pg_class_relhassubclass 20
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#define Anum_pg_class_relacl 21
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/* ----------------
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* initial contents of pg_class
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* ----------------
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*/
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DATA(insert OID = 1247 ( pg_type 71 PGUID 0 0 0 0 0 f f r 17 0 0 0 0 0 f f f _null_ ));
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DESCR("");
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DATA(insert OID = 1249 ( pg_attribute 75 PGUID 0 0 0 0 0 f f r 15 0 0 0 0 0 f f f _null_ ));
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DESCR("");
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DATA(insert OID = 1255 ( pg_proc 81 PGUID 0 0 0 0 0 f f r 17 0 0 0 0 0 f f f _null_ ));
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DESCR("");
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DATA(insert OID = 1259 ( pg_class 83 PGUID 0 0 0 0 0 f f r 21 0 0 0 0 0 f f f _null_ ));
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DESCR("");
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DATA(insert OID = 1260 ( pg_shadow 86 PGUID 0 0 0 0 0 f t r 8 0 0 0 0 0 f f f _null_ ));
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DESCR("");
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DATA(insert OID = 1261 ( pg_group 87 PGUID 0 0 0 0 0 f t r 3 0 0 0 0 0 f f f _null_ ));
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DESCR("");
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DATA(insert OID = 1262 ( pg_database 88 PGUID 0 0 0 0 0 f t r 4 0 0 0 0 0 f f f _null_ ));
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DESCR("");
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DATA(insert OID = 1264 ( pg_variable 90 PGUID 0 0 0 0 0 f t s 1 0 0 0 0 0 f f f _null_ ));
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DESCR("");
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DATA(insert OID = 1269 ( pg_log 99 PGUID 0 0 0 0 0 f t s 1 0 0 0 0 0 f f f _null_ ));
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DESCR("");
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DATA(insert OID = 376 ( pg_xactlock 0 PGUID 0 0 0 0 0 f t s 1 0 0 0 0 0 f f f _null_ ));
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DESCR("");
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DATA(insert OID = 1215 ( pg_attrdef 109 PGUID 0 0 0 0 0 t t r 4 0 0 0 0 0 f f f _null_ ));
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DESCR("");
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DATA(insert OID = 1216 ( pg_relcheck 110 PGUID 0 0 0 0 0 t t r 4 0 0 0 0 0 f f f _null_ ));
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DESCR("");
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DATA(insert OID = 1219 ( pg_trigger 111 PGUID 0 0 0 0 0 t t r 13 0 0 0 0 0 f f f _null_ ));
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DESCR("");
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#define RelOid_pg_type 1247
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#define RelOid_pg_attribute 1249
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#define RelOid_pg_proc 1255
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#define RelOid_pg_class 1259
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#define RelOid_pg_shadow 1260
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#define RelOid_pg_group 1261
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#define RelOid_pg_database 1262
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#define RelOid_pg_variable 1264
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#define RelOid_pg_log 1269
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#define RelOid_pg_attrdef 1215
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#define RelOid_pg_relcheck 1216
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#define RelOid_pg_trigger 1219
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/* Xact lock pseudo-table */
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#define XactLockTableId 376
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#define RELKIND_INDEX 'i' /* secondary index */
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#define RELKIND_LOBJECT 'l' /* large objects */
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#define RELKIND_RELATION 'r' /* ordinary cataloged heap */
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#define RELKIND_SPECIAL 's' /* special (non-heap) */
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#define RELKIND_SEQUENCE 'S' /* SEQUENCE relation */
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#define RELKIND_UNCATALOGED 'u' /* temporary heap */
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#define RELKIND_TOASTVALUE 't' /* moved off huge values */
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#define RELKIND_VIEW 'v' /* view */
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#endif /* PG_CLASS_H */
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