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blue-lemon0104
273
db_include/catalog/dependency.h
Executable file
273
db_include/catalog/dependency.h
Executable file
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/*-------------------------------------------------------------------------
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*
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* dependency.h
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* Routines to support inter-object dependencies.
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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/dependency.h
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef DEPENDENCY_H
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#define DEPENDENCY_H
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#include "catalog/objectaddress.h"
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/*
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* Precise semantics of a dependency relationship are specified by the
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* DependencyType code (which is stored in a "char" field in pg_depend,
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* so we assign ASCII-code values to the enumeration members).
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*
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* In all cases, a dependency relationship indicates that the referenced
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* object may not be dropped without also dropping the dependent object.
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* However, there are several subflavors; see the description of pg_depend
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* in catalogs.sgml for details.
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*/
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typedef enum DependencyType
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{
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DEPENDENCY_NORMAL = 'n',
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DEPENDENCY_AUTO = 'a',
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DEPENDENCY_INTERNAL = 'i',
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DEPENDENCY_PARTITION_PRI = 'P',
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DEPENDENCY_PARTITION_SEC = 'S',
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DEPENDENCY_EXTENSION = 'e',
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DEPENDENCY_AUTO_EXTENSION = 'x',
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DEPENDENCY_PIN = 'p'
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} DependencyType;
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/*
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* There is also a SharedDependencyType enum type that determines the exact
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* semantics of an entry in pg_shdepend. Just like regular dependency entries,
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* any pg_shdepend entry means that the referenced object cannot be dropped
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* unless the dependent object is dropped at the same time. There are some
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* additional rules however:
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*
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* (a) For a SHARED_DEPENDENCY_PIN entry, there is no dependent object --
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* rather, the referenced object is an essential part of the system. This
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* applies to the initdb-created superuser. Entries of this type are only
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* created by initdb; objects in this category don't need further pg_shdepend
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* entries if more objects come to depend on them.
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*
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* (b) a SHARED_DEPENDENCY_OWNER entry means that the referenced object is
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* the role owning the dependent object. The referenced object must be
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* a pg_authid entry.
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*
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* (c) a SHARED_DEPENDENCY_ACL entry means that the referenced object is
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* a role mentioned in the ACL field of the dependent object. The referenced
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* object must be a pg_authid entry. (SHARED_DEPENDENCY_ACL entries are not
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* created for the owner of an object; hence two objects may be linked by
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* one or the other, but not both, of these dependency types.)
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*
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* (d) a SHARED_DEPENDENCY_POLICY entry means that the referenced object is
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* a role mentioned in a policy object. The referenced object must be a
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* pg_authid entry.
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*
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* (e) a SHARED_DEPENDENCY_TABLESPACE entry means that the referenced
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* object is a tablespace mentioned in a relation without storage. The
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* referenced object must be a pg_tablespace entry. (Relations that have
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* storage don't need this: they are protected by the existence of a physical
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* file in the tablespace.)
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*
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* SHARED_DEPENDENCY_INVALID is a value used as a parameter in internal
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* routines, and is not valid in the catalog itself.
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*/
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typedef enum SharedDependencyType
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{
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SHARED_DEPENDENCY_PIN = 'p',
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SHARED_DEPENDENCY_OWNER = 'o',
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SHARED_DEPENDENCY_ACL = 'a',
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SHARED_DEPENDENCY_POLICY = 'r',
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SHARED_DEPENDENCY_TABLESPACE = 't',
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SHARED_DEPENDENCY_INVALID = 0
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} SharedDependencyType;
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/* expansible list of ObjectAddresses (private in dependency.c) */
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typedef struct ObjectAddresses ObjectAddresses;
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/*
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* This enum covers all system catalogs whose OIDs can appear in
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* pg_depend.classId or pg_shdepend.classId. Keep object_classes[] in sync.
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*/
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typedef enum ObjectClass
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{
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OCLASS_CLASS, /* pg_class */
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OCLASS_PROC, /* pg_proc */
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OCLASS_TYPE, /* pg_type */
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OCLASS_CAST, /* pg_cast */
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OCLASS_COLLATION, /* pg_collation */
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OCLASS_CONSTRAINT, /* pg_constraint */
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OCLASS_CONVERSION, /* pg_conversion */
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OCLASS_DEFAULT, /* pg_attrdef */
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OCLASS_LANGUAGE, /* pg_language */
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OCLASS_LARGEOBJECT, /* pg_largeobject */
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OCLASS_OPERATOR, /* pg_operator */
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OCLASS_OPCLASS, /* pg_opclass */
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OCLASS_OPFAMILY, /* pg_opfamily */
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OCLASS_AM, /* pg_am */
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OCLASS_AMOP, /* pg_amop */
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OCLASS_AMPROC, /* pg_amproc */
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OCLASS_REWRITE, /* pg_rewrite */
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OCLASS_TRIGGER, /* pg_trigger */
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OCLASS_SCHEMA, /* pg_namespace */
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OCLASS_STATISTIC_EXT, /* pg_statistic_ext */
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OCLASS_TSPARSER, /* pg_ts_parser */
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OCLASS_TSDICT, /* pg_ts_dict */
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OCLASS_TSTEMPLATE, /* pg_ts_template */
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OCLASS_TSCONFIG, /* pg_ts_config */
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OCLASS_ROLE, /* pg_authid */
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OCLASS_DATABASE, /* pg_database */
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OCLASS_TBLSPACE, /* pg_tablespace */
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OCLASS_FDW, /* pg_foreign_data_wrapper */
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OCLASS_FOREIGN_SERVER, /* pg_foreign_server */
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OCLASS_USER_MAPPING, /* pg_user_mapping */
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OCLASS_DEFACL, /* pg_default_acl */
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OCLASS_EXTENSION, /* pg_extension */
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OCLASS_EVENT_TRIGGER, /* pg_event_trigger */
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OCLASS_POLICY, /* pg_policy */
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OCLASS_PUBLICATION, /* pg_publication */
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OCLASS_PUBLICATION_REL, /* pg_publication_rel */
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OCLASS_SUBSCRIPTION, /* pg_subscription */
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OCLASS_TRANSFORM /* pg_transform */
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} ObjectClass;
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#define LAST_OCLASS OCLASS_TRANSFORM
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/* flag bits for performDeletion/performMultipleDeletions: */
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#define PERFORM_DELETION_INTERNAL 0x0001 /* internal action */
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#define PERFORM_DELETION_CONCURRENTLY 0x0002 /* concurrent drop */
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#define PERFORM_DELETION_QUIETLY 0x0004 /* suppress notices */
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#define PERFORM_DELETION_SKIP_ORIGINAL 0x0008 /* keep original obj */
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#define PERFORM_DELETION_SKIP_EXTENSIONS 0x0010 /* keep extensions */
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#define PERFORM_DELETION_CONCURRENT_LOCK 0x0020 /* normal drop with
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* concurrent lock mode */
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/* in dependency.c */
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extern void AcquireDeletionLock(const ObjectAddress *object, int flags);
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extern void ReleaseDeletionLock(const ObjectAddress *object);
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extern void performDeletion(const ObjectAddress *object,
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DropBehavior behavior, int flags);
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extern void performMultipleDeletions(const ObjectAddresses *objects,
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DropBehavior behavior, int flags);
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extern void recordDependencyOnExpr(const ObjectAddress *depender,
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Node *expr, List *rtable,
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DependencyType behavior);
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extern void recordDependencyOnSingleRelExpr(const ObjectAddress *depender,
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Node *expr, Oid relId,
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DependencyType behavior,
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DependencyType self_behavior,
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bool reverse_self);
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extern ObjectClass getObjectClass(const ObjectAddress *object);
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extern ObjectAddresses *new_object_addresses(void);
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extern void add_exact_object_address(const ObjectAddress *object,
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ObjectAddresses *addrs);
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extern bool object_address_present(const ObjectAddress *object,
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const ObjectAddresses *addrs);
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extern void record_object_address_dependencies(const ObjectAddress *depender,
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ObjectAddresses *referenced,
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DependencyType behavior);
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extern void sort_object_addresses(ObjectAddresses *addrs);
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extern void free_object_addresses(ObjectAddresses *addrs);
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/* in pg_depend.c */
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extern void recordDependencyOn(const ObjectAddress *depender,
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const ObjectAddress *referenced,
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DependencyType behavior);
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extern void recordMultipleDependencies(const ObjectAddress *depender,
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const ObjectAddress *referenced,
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int nreferenced,
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DependencyType behavior);
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extern void recordDependencyOnCurrentExtension(const ObjectAddress *object,
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bool isReplace);
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extern long deleteDependencyRecordsFor(Oid classId, Oid objectId,
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bool skipExtensionDeps);
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extern long deleteDependencyRecordsForClass(Oid classId, Oid objectId,
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Oid refclassId, char deptype);
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extern long deleteDependencyRecordsForSpecific(Oid classId, Oid objectId,
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char deptype,
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Oid refclassId, Oid refobjectId);
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extern long changeDependencyFor(Oid classId, Oid objectId,
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Oid refClassId, Oid oldRefObjectId,
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Oid newRefObjectId);
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extern long changeDependenciesOf(Oid classId, Oid oldObjectId,
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Oid newObjectId);
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extern long changeDependenciesOn(Oid refClassId, Oid oldRefObjectId,
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Oid newRefObjectId);
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extern Oid getExtensionOfObject(Oid classId, Oid objectId);
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extern List *getAutoExtensionsOfObject(Oid classId, Oid objectId);
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extern bool sequenceIsOwned(Oid seqId, char deptype, Oid *tableId, int32 *colId);
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extern List *getOwnedSequences(Oid relid);
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extern Oid getIdentitySequence(Oid relid, AttrNumber attnum, bool missing_ok);
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extern Oid get_index_constraint(Oid indexId);
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extern List *get_index_ref_constraints(Oid indexId);
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/* in pg_shdepend.c */
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extern void recordSharedDependencyOn(ObjectAddress *depender,
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ObjectAddress *referenced,
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SharedDependencyType deptype);
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extern void deleteSharedDependencyRecordsFor(Oid classId, Oid objectId,
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int32 objectSubId);
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extern void recordDependencyOnOwner(Oid classId, Oid objectId, Oid owner);
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extern void changeDependencyOnOwner(Oid classId, Oid objectId,
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Oid newOwnerId);
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extern void recordDependencyOnTablespace(Oid classId, Oid objectId,
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Oid tablespace);
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extern void changeDependencyOnTablespace(Oid classId, Oid objectId,
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Oid newTablespaceId);
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extern void updateAclDependencies(Oid classId, Oid objectId, int32 objectSubId,
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Oid ownerId,
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int noldmembers, Oid *oldmembers,
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int nnewmembers, Oid *newmembers);
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extern bool checkSharedDependencies(Oid classId, Oid objectId,
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char **detail_msg, char **detail_log_msg);
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extern void shdepLockAndCheckObject(Oid classId, Oid objectId);
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extern void copyTemplateDependencies(Oid templateDbId, Oid newDbId);
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extern void dropDatabaseDependencies(Oid databaseId);
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extern void shdepDropOwned(List *relids, DropBehavior behavior);
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extern void shdepReassignOwned(List *relids, Oid newrole);
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#endif /* DEPENDENCY_H */
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