schemacmds.h File Reference

#include "catalog/objectaddress.h"
#include "nodes/parsenodes.h"

Include dependency graph for schemacmds.h:

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Go to the source code of this file.

Functions
Oid	CreateSchemaCommand (CreateSchemaStmt *stmt, const char *queryString, int stmt_location, int stmt_len)
ObjectAddress	RenameSchema (const char *oldname, const char *newname)
ObjectAddress	AlterSchemaOwner (const char *name, Oid newOwnerId)
void	AlterSchemaOwner_oid (Oid schemaoid, Oid newOwnerId)

Function Documentation

AlterSchemaOwner()

ObjectAddress AlterSchemaOwner	(	const char *	name,
		Oid	newOwnerId
	)

Definition at line 312 of file schemacmds.c.

{
    Oid         nspOid;
    HeapTuple   tup;
    Relation    rel;
    ObjectAddress address;
    Form_pg_namespace nspform;
 
    rel = table_open(NamespaceRelationId, RowExclusiveLock);
 
    tup = SearchSysCache1(NAMESPACENAME, CStringGetDatum(name));
    if (!HeapTupleIsValid(tup))
        ereport(ERROR,
                (errcode(ERRCODE_UNDEFINED_SCHEMA),
                 errmsg("schema \"%s\" does not exist", name)));
 
    nspform = (Form_pg_namespace) GETSTRUCT(tup);
    nspOid = nspform->oid;
 
    AlterSchemaOwner_internal(tup, rel, newOwnerId);
 
    ObjectAddressSet(address, NamespaceRelationId, nspOid);
 
    ReleaseSysCache(tup);
 
    table_close(rel, RowExclusiveLock);
 
    return address;
}

References AlterSchemaOwner_internal(), CStringGetDatum(), ereport, errcode(), errmsg(), ERROR, GETSTRUCT, HeapTupleIsValid, name, NAMESPACENAME, ObjectAddressSet, ReleaseSysCache(), RowExclusiveLock, SearchSysCache1(), table_close(), and table_open().

Referenced by ExecAlterOwnerStmt().

AlterSchemaOwner_oid()

void AlterSchemaOwner_oid	(	Oid	schemaoid,
		Oid	newOwnerId
	)

Definition at line 289 of file schemacmds.c.

{
    HeapTuple   tup;
    Relation    rel;
 
    rel = table_open(NamespaceRelationId, RowExclusiveLock);
 
    tup = SearchSysCache1(NAMESPACEOID, ObjectIdGetDatum(schemaoid));
    if (!HeapTupleIsValid(tup))
        elog(ERROR, "cache lookup failed for schema %u", schemaoid);
 
    AlterSchemaOwner_internal(tup, rel, newOwnerId);
 
    ReleaseSysCache(tup);
 
    table_close(rel, RowExclusiveLock);
}

References AlterSchemaOwner_internal(), elog(), ERROR, HeapTupleIsValid, NAMESPACEOID, ObjectIdGetDatum(), ReleaseSysCache(), RowExclusiveLock, SearchSysCache1(), table_close(), and table_open().

Referenced by shdepReassignOwned().

CreateSchemaCommand()

Oid CreateSchemaCommand	(	CreateSchemaStmt *	stmt,
		const char *	queryString,
		int	stmt_location,
		int	stmt_len
	)

Definition at line 51 of file schemacmds.c.

{
    const char *schemaName = stmt->schemaname;
    Oid         namespaceId;
    OverrideSearchPath *overridePath;
    List       *parsetree_list;
    ListCell   *parsetree_item;
    Oid         owner_uid;
    Oid         saved_uid;
    int         save_sec_context;
    AclResult   aclresult;
    ObjectAddress address;
 
    GetUserIdAndSecContext(&saved_uid, &save_sec_context);
 
    /*
     * Who is supposed to own the new schema?
     */
    if (stmt->authrole)
        owner_uid = get_rolespec_oid(stmt->authrole, false);
    else
        owner_uid = saved_uid;
 
    /* fill schema name with the user name if not specified */
    if (!schemaName)
    {
        HeapTuple   tuple;
 
        tuple = SearchSysCache1(AUTHOID, ObjectIdGetDatum(owner_uid));
        if (!HeapTupleIsValid(tuple))
            elog(ERROR, "cache lookup failed for role %u", owner_uid);
        schemaName =
            pstrdup(NameStr(((Form_pg_authid) GETSTRUCT(tuple))->rolname));
        ReleaseSysCache(tuple);
    }
 
    /*
     * To create a schema, must have schema-create privilege on the current
     * database and must be able to become the target role (this does not
     * imply that the target role itself must have create-schema privilege).
     * The latter provision guards against "giveaway" attacks.  Note that a
     * superuser will always have both of these privileges a fortiori.
     */
    aclresult = object_aclcheck(DatabaseRelationId, MyDatabaseId, saved_uid, ACL_CREATE);
    if (aclresult != ACLCHECK_OK)
        aclcheck_error(aclresult, OBJECT_DATABASE,
                       get_database_name(MyDatabaseId));
 
    check_can_set_role(saved_uid, owner_uid);
 
    /* Additional check to protect reserved schema names */
    if (!allowSystemTableMods && IsReservedName(schemaName))
        ereport(ERROR,
                (errcode(ERRCODE_RESERVED_NAME),
                 errmsg("unacceptable schema name \"%s\"", schemaName),
                 errdetail("The prefix \"pg_\" is reserved for system schemas.")));
 
    /*
     * If if_not_exists was given and the schema already exists, bail out.
     * (Note: we needn't check this when not if_not_exists, because
     * NamespaceCreate will complain anyway.)  We could do this before making
     * the permissions checks, but since CREATE TABLE IF NOT EXISTS makes its
     * creation-permission check first, we do likewise.
     */
    if (stmt->if_not_exists)
    {
        namespaceId = get_namespace_oid(schemaName, true);
        if (OidIsValid(namespaceId))
        {
            /*
             * If we are in an extension script, insist that the pre-existing
             * object be a member of the extension, to avoid security risks.
             */
            ObjectAddressSet(address, NamespaceRelationId, namespaceId);
            checkMembershipInCurrentExtension(&address);
 
            /* OK to skip */
            ereport(NOTICE,
                    (errcode(ERRCODE_DUPLICATE_SCHEMA),
                     errmsg("schema \"%s\" already exists, skipping",
                            schemaName)));
            return InvalidOid;
        }
    }
 
    /*
     * If the requested authorization is different from the current user,
     * temporarily set the current user so that the object(s) will be created
     * with the correct ownership.
     *
     * (The setting will be restored at the end of this routine, or in case of
     * error, transaction abort will clean things up.)
     */
    if (saved_uid != owner_uid)
        SetUserIdAndSecContext(owner_uid,
                               save_sec_context | SECURITY_LOCAL_USERID_CHANGE);
 
    /* Create the schema's namespace */
    namespaceId = NamespaceCreate(schemaName, owner_uid, false);
 
    /* Advance cmd counter to make the namespace visible */
    CommandCounterIncrement();
 
    /*
     * Temporarily make the new namespace be the front of the search path, as
     * well as the default creation target namespace.  This will be undone at
     * the end of this routine, or upon error.
     */
    overridePath = GetOverrideSearchPath(CurrentMemoryContext);
    overridePath->schemas = lcons_oid(namespaceId, overridePath->schemas);
    /* XXX should we clear overridePath->useTemp? */
    PushOverrideSearchPath(overridePath);
 
    /*
     * Report the new schema to possibly interested event triggers.  Note we
     * must do this here and not in ProcessUtilitySlow because otherwise the
     * objects created below are reported before the schema, which would be
     * wrong.
     */
    ObjectAddressSet(address, NamespaceRelationId, namespaceId);
    EventTriggerCollectSimpleCommand(address, InvalidObjectAddress,
                                     (Node *) stmt);
 
    /*
     * Examine the list of commands embedded in the CREATE SCHEMA command, and
     * reorganize them into a sequentially executable order with no forward
     * references.  Note that the result is still a list of raw parsetrees ---
     * we cannot, in general, run parse analysis on one statement until we
     * have actually executed the prior ones.
     */
    parsetree_list = transformCreateSchemaStmt(stmt);
 
    /*
     * Execute each command contained in the CREATE SCHEMA.  Since the grammar
     * allows only utility commands in CREATE SCHEMA, there is no need to pass
     * them through parse_analyze_*() or the rewriter; we can just hand them
     * straight to ProcessUtility.
     */
    foreach(parsetree_item, parsetree_list)
    {
        Node       *stmt = (Node *) lfirst(parsetree_item);
        PlannedStmt *wrapper;
 
        /* need to make a wrapper PlannedStmt */
        wrapper = makeNode(PlannedStmt);
        wrapper->commandType = CMD_UTILITY;
        wrapper->canSetTag = false;
        wrapper->utilityStmt = stmt;
        wrapper->stmt_location = stmt_location;
        wrapper->stmt_len = stmt_len;
 
        /* do this step */
        ProcessUtility(wrapper,
                       queryString,
                       false,
                       PROCESS_UTILITY_SUBCOMMAND,
                       NULL,
                       NULL,
                       None_Receiver,
                       NULL);
 
        /* make sure later steps can see the object created here */
        CommandCounterIncrement();
    }
 
    /* Reset search path to normal state */
    PopOverrideSearchPath();
 
    /* Reset current user and security context */
    SetUserIdAndSecContext(saved_uid, save_sec_context);
 
    return namespaceId;
}

References ACL_CREATE, aclcheck_error(), ACLCHECK_OK, allowSystemTableMods, AUTHOID, CreateSchemaStmt::authrole, PlannedStmt::canSetTag, check_can_set_role(), checkMembershipInCurrentExtension(), CMD_UTILITY, CommandCounterIncrement(), PlannedStmt::commandType, CurrentMemoryContext, elog(), ereport, errcode(), errdetail(), errmsg(), ERROR, EventTriggerCollectSimpleCommand(), get_database_name(), get_namespace_oid(), get_rolespec_oid(), GetOverrideSearchPath(), GETSTRUCT, GetUserIdAndSecContext(), HeapTupleIsValid, CreateSchemaStmt::if_not_exists, InvalidObjectAddress, InvalidOid, IsReservedName(), lcons_oid(), lfirst, makeNode, MyDatabaseId, NamespaceCreate(), NameStr, None_Receiver, NOTICE, object_aclcheck(), OBJECT_DATABASE, ObjectAddressSet, ObjectIdGetDatum(), OidIsValid, PopOverrideSearchPath(), PROCESS_UTILITY_SUBCOMMAND, ProcessUtility(), pstrdup(), PushOverrideSearchPath(), ReleaseSysCache(), rolname, CreateSchemaStmt::schemaname, OverrideSearchPath::schemas, SearchSysCache1(), SECURITY_LOCAL_USERID_CHANGE, SetUserIdAndSecContext(), PlannedStmt::stmt_len, PlannedStmt::stmt_location, transformCreateSchemaStmt(), and PlannedStmt::utilityStmt.

Referenced by CreateExtensionInternal(), and ProcessUtilitySlow().

RenameSchema()

ObjectAddress RenameSchema	(	const char *	oldname,
		const char *	newname
	)

Definition at line 231 of file schemacmds.c.

{
    Oid         nspOid;
    HeapTuple   tup;
    Relation    rel;
    AclResult   aclresult;
    ObjectAddress address;
    Form_pg_namespace nspform;
 
    rel = table_open(NamespaceRelationId, RowExclusiveLock);
 
    tup = SearchSysCacheCopy1(NAMESPACENAME, CStringGetDatum(oldname));
    if (!HeapTupleIsValid(tup))
        ereport(ERROR,
                (errcode(ERRCODE_UNDEFINED_SCHEMA),
                 errmsg("schema \"%s\" does not exist", oldname)));
 
    nspform = (Form_pg_namespace) GETSTRUCT(tup);
    nspOid = nspform->oid;
 
    /* make sure the new name doesn't exist */
    if (OidIsValid(get_namespace_oid(newname, true)))
        ereport(ERROR,
                (errcode(ERRCODE_DUPLICATE_SCHEMA),
                 errmsg("schema \"%s\" already exists", newname)));
 
    /* must be owner */
    if (!object_ownercheck(NamespaceRelationId, nspOid, GetUserId()))
        aclcheck_error(ACLCHECK_NOT_OWNER, OBJECT_SCHEMA,
                       oldname);
 
    /* must have CREATE privilege on database */
    aclresult = object_aclcheck(DatabaseRelationId, MyDatabaseId, GetUserId(), ACL_CREATE);
    if (aclresult != ACLCHECK_OK)
        aclcheck_error(aclresult, OBJECT_DATABASE,
                       get_database_name(MyDatabaseId));
 
    if (!allowSystemTableMods && IsReservedName(newname))
        ereport(ERROR,
                (errcode(ERRCODE_RESERVED_NAME),
                 errmsg("unacceptable schema name \"%s\"", newname),
                 errdetail("The prefix \"pg_\" is reserved for system schemas.")));
 
    /* rename */
    namestrcpy(&nspform->nspname, newname);
    CatalogTupleUpdate(rel, &tup->t_self, tup);
 
    InvokeObjectPostAlterHook(NamespaceRelationId, nspOid, 0);
 
    ObjectAddressSet(address, NamespaceRelationId, nspOid);
 
    table_close(rel, NoLock);
    heap_freetuple(tup);
 
    return address;
}

References ACL_CREATE, aclcheck_error(), ACLCHECK_NOT_OWNER, ACLCHECK_OK, allowSystemTableMods, CatalogTupleUpdate(), CStringGetDatum(), ereport, errcode(), errdetail(), errmsg(), ERROR, get_database_name(), get_namespace_oid(), GETSTRUCT, GetUserId(), heap_freetuple(), HeapTupleIsValid, InvokeObjectPostAlterHook, IsReservedName(), MyDatabaseId, NAMESPACENAME, namestrcpy(), NoLock, object_aclcheck(), OBJECT_DATABASE, object_ownercheck(), OBJECT_SCHEMA, ObjectAddressSet, OidIsValid, RowExclusiveLock, SearchSysCacheCopy1, HeapTupleData::t_self, table_close(), and table_open().

Referenced by ExecRenameStmt().