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For those system catalogs that have a unique indexes, make a primary key and unique constraint, using ALTER TABLE ... PRIMARY KEY/UNIQUE USING INDEX. This can be helpful for GUI tools that look for a primary key, and it might in the future allow declaring foreign keys, for making schema diagrams. The constraint creation statements are automatically created by genbki.pl from DECLARE_UNIQUE_INDEX directives. To specify which one of the available unique indexes is the primary key, use the new directive DECLARE_UNIQUE_INDEX_PKEY instead. By convention, we usually make a catalog's OID column its primary key, if it has one. Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us> Discussion: https://www.postgresql.org/message-id/flat/dc5f44d9-5ec1-a596-0251-dadadcdede98@2ndquadrant.com
93 lines
2.3 KiB
C
93 lines
2.3 KiB
C
/*-------------------------------------------------------------------------
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*
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* pg_database.h
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* definition of the "database" system catalog (pg_database)
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*
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*
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* Portions Copyright (c) 1996-2021, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* src/include/catalog/pg_database.h
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*
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* NOTES
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* The Catalog.pm module reads this file and derives schema
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* information.
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef PG_DATABASE_H
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#define PG_DATABASE_H
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#include "catalog/genbki.h"
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#include "catalog/pg_database_d.h"
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/* ----------------
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* pg_database definition. cpp turns this into
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* typedef struct FormData_pg_database
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* ----------------
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*/
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CATALOG(pg_database,1262,DatabaseRelationId) BKI_SHARED_RELATION BKI_ROWTYPE_OID(1248,DatabaseRelation_Rowtype_Id) BKI_SCHEMA_MACRO
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{
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/* oid */
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Oid oid;
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/* database name */
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NameData datname;
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/* owner of database */
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Oid datdba BKI_DEFAULT(PGUID);
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/* character encoding */
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int32 encoding;
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/* LC_COLLATE setting */
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NameData datcollate;
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/* LC_CTYPE setting */
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NameData datctype;
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/* allowed as CREATE DATABASE template? */
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bool datistemplate;
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/* new connections allowed? */
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bool datallowconn;
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/* max connections allowed (-1=no limit) */
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int32 datconnlimit;
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/* highest OID to consider a system OID */
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Oid datlastsysoid;
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/* all Xids < this are frozen in this DB */
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TransactionId datfrozenxid;
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/* all multixacts in the DB are >= this */
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TransactionId datminmxid;
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/* default table space for this DB */
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Oid dattablespace BKI_LOOKUP(pg_tablespace);
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#ifdef CATALOG_VARLEN /* variable-length fields start here */
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/* access permissions */
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aclitem datacl[1];
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#endif
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} FormData_pg_database;
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/* ----------------
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* Form_pg_database corresponds to a pointer to a tuple with
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* the format of pg_database relation.
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* ----------------
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*/
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typedef FormData_pg_database *Form_pg_database;
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DECLARE_TOAST(pg_database, 4177, 4178);
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#define PgDatabaseToastTable 4177
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#define PgDatabaseToastIndex 4178
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DECLARE_UNIQUE_INDEX(pg_database_datname_index, 2671, on pg_database using btree(datname name_ops));
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#define DatabaseNameIndexId 2671
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DECLARE_UNIQUE_INDEX_PKEY(pg_database_oid_index, 2672, on pg_database using btree(oid oid_ops));
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#define DatabaseOidIndexId 2672
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#endif /* PG_DATABASE_H */
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