51 DBMS_DBFS_CONTENT_SPI

The DBMS_DBFS_CONTENT_SPI package is a specification for DBMS_DBFS_CONTENT store providers, which must be implemented. Application designers can create PL/SQL packages conforming to this specification to extend DBMS_DBFS_CONTENT to use custom store providers.

This chapter contains the following topics:

Related Topics

51.1 ODBMS_DBFS_CONTENT_SPI Overview

The DBMS_DBFS_CONTENT_SPI package describes an internal contract between the implementation of the DBMS_DBFS_CONTENT interface and individual store providers, and whichever package contains their code.

Since PL/SQL does not allow a compile-time, declarative type-conformation between package signatures, store providers should informally conform to the SPI, which is to say, they should implement the SPI by means of a package that contains all of the methods specified in package DBMS_DBFS_CONTENT_SPI, with the same method signatures and semantics.

Obviously, these provider packages can implement other methods and expose other interfaces, however, these interfaces are not to be used by the DBMS_DBFS_CONTENT interface itself.

Since the provider SPI is merely a contract specification, there is no package body for DBMS_DBFS_CONTENT_SPI, and it is not possible to actually invoke any methods using this package.

The SPI references various elements (constants, types, exceptions) defined by the DBMS_DBFS_CONTENT interface.

Additionally, there is an almost one-to-one correspondence between the client API exported by the DBMS_DBFS_CONTENT interface and the provider interface that the DBMS_DBFS_CONTENT interface itself expects to work against.

The main distinction in the method naming conventions is that all path name references are always store-qualified. That is, the notion of mount-points and full-absolute path names have been normalized and converted to store-qualified path names by the DBMS_DBFS_CONTENT interface before it invokes any of the provider SPI methods.

Since the interconnection of the DBMS_DBFS_CONTENT interface and the provider SPI is a 1-to-many pluggable architecture, and the interface uses dynamic SQL to invoke methods in the provider SPI, this can lead to runtime errors.

Related Topics

51.2 DBMS_DBFS_CONTENT_SPI Security Model

Implementations of the DBMS_DBFS_CONTENT_SPI package should be created as AUTHID CURRENT_USER.

51.3 DBMS_DBFS_CONTENT_SPI Operational Notes

This topic lists operational notes for DBMS_DBFS_CONTENT_SPI implementation, path names, and other operations.

Implementation

Since the interconnection of the DBMS_DBFS_CONTENT interface and the provider SPI is a 1-to-many pluggable architecture, the interface uses dynamic SQL to invoke methods in the provider SPI, this can lead to runtime errors.

There are no explicit INIT or FINI methods to indicate when the DBMS_DBFS_CONTENT interface plugs or unplugs a particular provider SPI. Provider SPIs must be willing to auto-initialize themselves at any SPI entry-point.

All operations performed by a store provider are "stateless" in that they are complete operations unto themselves. If state is necessary to be maintained for some reason, then the state must be maintained in data structures such as auxiliary tables that can be queried as needed.

Path Names

All path names used in the provider SPI are store-qualified in pair form (store_name, pathname) where the path name is rooted within the store namespace.

Stores and their providers that support contentID-based access (see FEATURE_CONTENT_ID in Table 50-5) also support a form of addressing that is not based on path names. Content items are identified by an explicit store name, a NULL path name, and possibly a contentID specified as a parameter or by way of the OPT_CONTENT_ID (seeTable 50-8) property.

Not all operations are supported with contentID-based access, and applications should depend only on the simplest create or delete functionality being available.

Other DBMS_DBFS_CONTENT Operations

This table lists other operations and provides links to related discussions.

Table 51-1 Other DBMS_DBFS_CONTENT Operations

Other Operations See ...

Creation

Oracle Database SecureFiles and Large Objects Developer's Guide for further information on creation operations

Deletion

Oracle Database SecureFiles and Large Objects Developer's Guide for further information on deletion operations

Get (Retrieve) and Put (Insert)

Oracle Database SecureFiles and Large Objects Developer's Guide for further information on Get and Put operations

Rename and Move

Oracle Database SecureFiles and Large Objects Developer's Guide for further information on Rename and Move operations

Directory Navigation and Search

Oracle Database SecureFiles and Large Objects Developer's Guide for further information on Navigation and Search operations

Locking

Oracle Database SecureFiles and Large Objects Developer's Guide for further information on Locking operations

Access Check

Oracle Database SecureFiles and Large Objects Developer's Guide for further information on Access Check operations

51.4 Summary of DBMS_DBFS_CONTENT_SPI Subprograms

This table lists and describes the subprograms used in the DBMS_DBFS_CONTENT_SPI Package.

Table 51-2 DBMS_DBFS_CONTENT_SPI Package Subprograms

Subprogram Description

CHECKACCESS Function

Reports if the user (principal) can perform the specified operation on the given path

CREATEDIRECTORY Procedure

Creates a directory

CREATEFILE Procedure

Creates a file

CREATELINK Procedure

Creates a physical link to an already existing file system element

CREATEREFERENCE Procedure

Creates a new reference to the source file system element

DELETECONTENT Procedure

Deletes the file specified by the given contentID

DELETEDIRECTORY Procedure

Deletes a directory

DELETEFILE Procedure

Deletes a file

GETFEATURES Function

Returns the features of a store

GETPATH Procedures

Returns existing path items (such as files and directories)

GETPATHBYSTOREID Function

If the underlying GUID is found in the underlying store, returns the store-qualified path name

GETPATHNOWAIT Procedure

Implies that the operation is for an update, and, if implemented, allows providers to return an exception (ORA-00054) rather than wait for row locks.

GETSTOREID Function

Returns the ID of a store

GETVERSION Function

Returns the version associated with a store

LIST Function

Lists the contents of a directory path name

LOCKPATH Procedure

Applies user-level locks to the given valid path name

PURGEALL Procedure

Purges all soft-deleted entries matching the path and optional filter criteria

PURGEPATH Procedure

Purges any soft-deleted versions of the given path item

PUTPATH Procedures

Creates a new path item

RENAMEPATH Procedure

Renames or moves a path

RESTOREALL Procedure

Restores all soft-deleted path items meeting the path and filter criteria

RESTOREPATH Procedure

Restores all soft-deleted path items that match the given path and filter criteria

SEARCH Function

Searches for path items matching the given path and filter criteria

SETPATH Procedure

Assigns a path name to a path item represented by contentID

SPACEUSAGE Procedure

Queries file system space usage statistics

UNLOCKPATH Procedure

Unlocks path items that were previously locked with the LOCKPATH Procedure

51.4.1 CHECKACCESS Function

This function reports if the user (principal) can perform the specified operation on the given path. This enables verifying the validity of an operation without attempting to perform the operation. If CHECKACCESS returns 0, then the subprogram invoked to implement that operation should fail with an error.

Syntax

DBMS_DBFS_CONTENT_SPI.CHECKACCESS (
   store_name     IN     VARCHAR2  DEFAULT NULL,
   path           IN     VARCHAR2,
   pathtype       IN     INTEGER,
   operation      IN     VARCHAR2,
   principal      IN     VARCHAR2)
  RETURN  INTEGER;

Parameters

Table 51-3 CHECKACCESS Procedure Parameters

Parameter Description

store_name

Name of store

path

Name of path to check for access

pathtype

Type of object path represents (see Table 50-4)

operation

Operation to be checked (see Table 50-8)

principal

File system user for whom the access check is made

Usage Notes

Whether or not the user invokes this function, a store that supports access control internally performs these checks to guarantee security.

51.4.2 CREATEDIRECTORY Procedure

This procedure creates a directory.

Syntax

DBMS_DBFS_CONTENT_SPI.CREATEDIRECTORY (
   store_name  IN              VARCHAR2,
   path        IN              VARCHAR2,
   properties  IN OUT NOCOPY   DBMS_DBFS_CONTENT_PROPERTIES_T,
   prop_flags  IN              INTEGER,
   recurse     IN              INTEGER,
   ctx         IN              DBMS_DBFS_CONTENT_CONTEXT_T);

Parameters

Table 51-4 CREATEDIRECTORY Procedure Parameters

Parameter Description

store_name

Name of store

path

Name of path to the directory

properties

One or more properties and their values to be set, returned, or both, depending on prop_flags (see DBMS_DBFS_CONTENT_PROPERTIES_T Table Type)

prop_flags

Determines which properties are set, returned, or both. Default is PROP_STD. Specify properties to be returned by setting PROP_SPC (see Table 50-9), and providing an instance of the DBMS_DBFS_CONTENT_PROPERTIES_T Table Type with properties whose values are of interest.

recurse

If 0, do not execute recursively; otherwise, recursively create the directories above the given directory

ctx

Context with which to create the directory (see DBMS_DBFS_CONTENT_CONTEXT_T Object Type)

51.4.3 CREATEFILE Procedure

This procedure creates a file.

Syntax

DBMS_DBFS_CONTENT_SPI.CREATEFILE (
   store_name    IN              VARCHAR2,
   path          IN              VARCHAR2,
   properties    IN OUT NOCOPY   DBMS_DBFS_CONTENT_PROPERTIES_T,
   content       IN OUT NOCOPY   BLOB,
   prop_flags    IN              INTEGER,
   ctx           IN              DBMS_DBFS_CONTENT_CONTEXT_T);

Parameters

Table 51-5 CREATEFILE Procedure Parameters

Parameter Description

store_name

Name of store

path

Name of path to the file

properties

One or more properties and their values to be set, returned or both depending, or both on prop_flags (see DBMS_DBFS_CONTENT_PROPERTIES_T Table Type)

content

BLOB holding data with which to populate the file (optional)

prop_flags

Determines which properties are set, returned, or both. Default is PROP_STD. Specify properties to be returned by setting prop_spec, and providing an instance of the DBMS_DBFS_CONTENT_PROPERTIES_T Table Type with properties whose values are of interest.

ctx

Context with which to create the file (see DBMS_DBFS_CONTENT_CONTEXT_T Object Type)

51.4.4 CREATELINK Procedure

This procedure creates a physical link to an already existing file system element (such as file or directory). The resulting entry shares the same metadata structures as the value of the srcPath parameter, and so is similar to incrementing a reference count on the file system element. This is analogous to a UNIX file system hard link.

Syntax

DBMS_DBFS_CONTENT_SPI.CREATELINK (
   store_name    IN              VARCHAR2,
   srcPath       IN              VARCHAR2,
   dstPath       IN              VARCHAR2,
   properties    IN OUT NOCOPY   DBMS_DBFS_CONTENT_PROPERTIES_T,
   prop_flags    IN              INTEGER,
   ctx           IN              DBMS_DBFS_CONTENT_CONTEXT_T);

Parameters

Table 51-6 CREATELINK Procedure Parameters

Parameter Description

store_name

Name of store

srcPath

File system entry with which to link

dstPath

Path of the new link element to be created

properties

One or more properties and their values to be set, returned, or both, depending on prop_flags (see DBMS_DBFS_CONTENT_PROPERTIES_T Table Type)

prop_flags

Determines which properties are set, returned, or both. Default is PROP_STD. Specify properties to be returned by setting prop_spec, and providing an instance of the DBMS_DBFS_CONTENT_PROPERTIES_T Table Type with properties whose values are of interest.

ctx

Context with which to create the link (see DBMS_DBFS_CONTENT_CONTEXT_T Object Type)

51.4.5 CREATEREFERENCE Procedure

This procedure creates a new reference to the source file system element (such as a file, or directory). The resulting reference points to the source element but does not directly share metadata with the source element. This is analogous to a UNIX file system symbolic link.

Syntax

DBMS_DBFS_CONTENT_SPI.CREATEREFERENCE (
   srcPath       IN              VARCHAR2,
   dstPath       IN              VARCHAR2,
   properties    IN OUT NOCOPY   DBMS_DBFS_CONTENT_PROPERTIES_T,
   prop_flags    IN              INTEGER,
   store_name    IN              VARCHAR2,
   ctx           IN              DBMS_DBFS_CONTENT_CONTEXT_T);

Parameters

Table 51-7 CREATEREFERENCE Procedure Parameters

Parameter Description

store_name

Name of store

srcPath

File system entry with which to link

dstPath

Path of the new link element to be created

properties

One or more properties and their values to be set, returned, or both, depending on prop_flags (see DBMS_DBFS_CONTENT_PROPERTIES_T Table Type)

prop_flags

Determines which properties are set, returned, or both. Default is PROP_STD. Specify properties to be returned by setting prop_spec, and providing an instance of the DBMS_DBFS_CONTENT_PROPERTIES_T Table Type with properties whose values are of interest.

ctx

Context with which to create the reference (see DBMS_DBFS_CONTENT_CONTEXT_T Object Type)

51.4.6 DELETECONTENT Procedure

This procedure deletes the file specified by the given contentID.

Syntax

DBMS_DBFS_CONTENT_SPI.DELETECONTENT (
   store_name     IN     VARCHAR2,
   contentID      IN     RAW,
   filter         IN     VARCHAR2,
   soft_delete    IN     INTEGER,
   ctx            IN     DBMS_DBFS_CONTENT_CONTEXT_T);

Parameters

Table 51-8 DELETECONTENT Procedure Parameters

Parameter Description

store_name

Name of store

contentID

Unique identifier for the file to be deleted

filter

A filter, if any, to be applied

soft_delete

If 0, execute a hard (permanent) delete. For any value other than 0, perform a soft delete see Oracle Database SecureFiles and Large Objects Developer's Guide, Deletion Operations).

ctx

Context with which to delete the file (see DBMS_DBFS_CONTENT_CONTEXT_T Object Type)

51.4.7 DELETEDIRECTORY Procedure

This procedure deletes a directory.

Syntax

If recurse is nonzero, it recursively deletes all elements of the directory. A filter, if supplied, determines which elements of the directory are deleted.

DBMS_DBFS_CONTENT_SPI.DELETEDIRECTORY (
   store_name     IN     VARCHAR2,
   path           IN     VARCHAR2,
   filter         IN     VARCHAR2,
   soft_delete    IN     INTEGER,
   recurse        IN     INTEGER,
   ctx            IN     DBMS_DBFS_CONTENT_CONTEXT_T);

Parameters

Table 51-9 DELETEDIRECTORY Procedure Parameters

Parameter Description

store_name

Name of store

path

Name of path to the directory

filter

A filter, if any, to be applied

soft_delete

If 0, execute a hard (permanent) delete. For any value other than 0, perform a soft delete see Oracle Database SecureFiles and Large Objects Developer's Guide, Deletion Operations).

recurse

If 0, do not execute recursively. Otherwise, recursively delete the directories and files below the given directory.

ctx

Context with which to delete the directory (see DBMS_DBFS_CONTENT_CONTEXT_T Object Type)

51.4.8 DELETEFILE Procedure

This procedure deletes the specified file.

Syntax

DBMS_DBFS_CONTENT_SPI.DELETEFILE (
   store_name     IN     VARCHAR2,
   path           IN     VARCHAR2,
   filter         IN     VARCHAR2,
   soft_delete    IN     BOOLEAN,
   ctx            IN     DBMS_DBFS_CONTENT_CONTEXT_T);

Parameters

Table 51-10 DELETEFILE Procedure Parameters

Parameter Description

store_name

Name of store

path

Name of path to the file

filter

A filter, if any, to be applied

soft_delete

If 0, execute a hard (permanent) delete. For any value other than 0, perform a soft delete see Oracle Database SecureFiles and Large Objects Developer's Guide, Deletion Operations).

ctx

Context with which to delete the file (see DBMS_DBFS_CONTENT_CONTEXT_T Object Type)

51.4.9 GETFEATURES Function

This function returns the features of a store.

Syntax

DBMS_DBFS_CONTENT_SPI.GETFEATURES (
   store_name          IN      VARCHAR2)
  RETURN  INTEGER;

Parameters

Table 51-11 GETFEATURES Function Parameters

Parameter Description

store_name

Name of store

Return Values

DBMS_DBFS_CONTENT.FEATURE_* features supported by the Store Provider

51.4.10 GETPATH Procedures

This procedure returns existing path items (such as files and directories). This includes both data and metadata (properties).

The client can request (using prop_flags) that specific properties be returned. File path names can be read either by specifying a BLOB locator using the prop_data bitmask in prop_flags (see Table 50-9) or by passing one or more RAW buffers.

When forUpdate is 0, this procedure also accepts a valid "as of" timestamp parameter as part of ctx that can be used by stores to implement "as of" style flashback queries. Mutating versions of the GETPATH Procedures do not support these modes of operation.

Syntax

DBMS_DBFS_CONTENT_SPI.GETPATH (
   store_name  IN              VARCHAR2,
   path        IN              VARCHAR2,
   properties  IN OUT NOCOPY   DBMS_DBFS_CONTENT_PROPERTIES_T,
   content     OUT    NOCOPY   BLOB,
   item_type   OUT             INTEGER,
   prop_flags  IN              INTEGER,
   forUpdate   IN              INTEGER,
   deref       IN              INTEGER,
   ctx         IN              DBMS_DBFS_CONTENT_CONTEXT_T);

DBMS_DBFS_CONTENT_SPI.GETPATH (
   store_name  IN              VARCHAR2,
   path        IN              VARCHAR2,
   properties  IN OUT NOCOPY   DBMS_DBFS_CONTENT_PROPERTIES_T,
   amount      IN OUT          NUMBER,
   offset      IN              NUMBER,
   buffer      OUT    NOCOPY   RAW,
   prop_flags  IN              INTEGER,
   ctx         IN              DBMS_DBFS_CONTENT_CONTEXT_T);

DBMS_DBFS_CONTENT_SPI.GETPATH (
   store_name  IN              VARCHAR2,
   path        IN              VARCHAR2,
   properties  IN OUT NOCOPY   DBMS_DBFS_CONTENT_PROPERTIES_T,
   amount      IN OUT          NUMBER,
   offset      IN              NUMBER,
   buffers     OUT    NOCOPY   DBMS_DBFS_CONTENT_RAW_T,
   prop_flags  IN              INTEGER,
   ctx         IN              DBMS_DBFS_CONTENT_CONTEXT_T);

Parameters

Table 51-12 GETPATH Procedure Parameters

Parameter Description

store_name

Name of store

path

Name of path to path items

properties

One or more properties and their values to be returned depending on prop_flags (see DBMS_DBFS_CONTENT_PROPERTIES_T Table Type)

content

BLOB holding data which populates the file (optional)

item_type

Type of the path item specified (see Table 50-4)

amount

On input, number of bytes to be read. On output, number of bytes read

offset

Byte offset from which to begin reading

buffer

Buffer to which to write

buffers

Buffers to which to write

prop_flags

Determines which properties are set, returned, or both. Default is PROP_STD. Specify properties to be returned by setting prop_spec, and providing an instance of the DBMS_DBFS_CONTENT_PROPERTIES_T Table Type with properties whose values are of interest.

forUpdate

Specifies that a lock should be taken to signify exclusive write access to the path item

deref

If nonzero, attempts to resolve the given path item to actual data provided it is a reference (symbolic link)

ctx

Context with which to access the path items (see DBMS_DBFS_CONTENT_CONTEXT_T Object Type)

51.4.11 GETPATHBYSTOREID Function

If the underlying GUID is found in the underlying store, this function returns the store-qualified path name.

Syntax

DBMS_DBFS_CONTENT_SPI.GETPATHBYSTOREID (
   store_name          IN      VARCHAR2,
   guid                IN      INTEGER)
  RETURN VARCHAR2;

Parameters

Table 51-13 GETPATHBYSTOREID Function Parameters

Parameter Description

store_name

Name of store

guid

Unique ID representing the desired path item

Return Values

Store-qualified path name represented by the GUID

Usage Notes

If the STD_GUID is unknown, a NULL value is returned. Clients are expected to handle this as appropriate.

51.4.12 GETPATHNOWAIT Procedure

This procedure implies that the operation is for an update, and, if implemented, allows providers to return an exception (ORA-00054) rather than wait for row locks.

See FEATURE_NOWAIT in Table 50-5 for more information.

Syntax

DBMS_DBFS_CONTENT_SPI.GETPATHNOWAIT (
   store_name  IN              VARCHAR2,
   path        IN              VARCHAR2,
   properties  IN OUT NOCOPY   DBMS_DBFS_CONTENT_PROPERTIES_T,
   content     OUT    NOCOPY   BLOB,
   item_type   OUT             INTEGER,
   prop_flags  IN              INTEGER,
   deref       IN              INTEGER,
   ctx         IN              DBMS_DBFS_CONTENT_CONTEXT_T);

Parameters

Table 51-14 GETPATHNOWAIT Procedure Parameters

Parameter Description

store_name

Name of store

path

Name of path to path items

properties

One or more properties and their values to be returned depending on prop_flags (see DBMS_DBFS_CONTENT_PROPERTIES_T Table Type)

content

BLOB holding data which populates the file (optional)

item_type

Type of the path item specified (see Table 50-4)

prop_flags

Determines which properties are returned. Default is PROP_STD. Specify properties to be returned by setting prop_spec, and providing an instance of the DBMS_DBFS_CONTENT_PROPERTIES_T Table Type with properties whose values are of interest.

deref

If nonzero, attempts to resolve the given path item to actual data provided it is a reference (symbolic link)

ctx

Context with which to access the path items (see DBMS_DBFS_CONTENT_CONTEXT_T Object Type)

51.4.13 GETSTOREID Function

This function returns the ID of a store.

Syntax

DBMS_DBFS_CONTENT_SPI.GETSTOREID (
   store_name          IN      VARCHAR2)
  RETURN  NUMBER;

Parameters

Table 51-15 GETSTOREID Function Parameters

Parameter Description

store_name

Name of store

Return Values

ID of the Store

Usage Notes

A store ID identifies a provider-specific store, across registrations and mounts, but independent of changes to the store contents. For this reason, changes to the store table or tables should be reflected in the store ID, but re-initialization of the same store table or tables should preserve the store ID.

51.4.14 GETVERSION Function

This function returns the version associated with a store.

Syntax

DBMS_DBFS_CONTENT_SPI.GETVERSION (
   store_name          IN      VARCHAR2)
  RETURN  VARCHAR2;

Parameters

Table 51-16 GETVERSION Function Parameters

Parameter Description

store_name

Name of store

Return Values

A "version" (either specific to a provider package, or to an individual store) based on a standard a.b.c naming convention (for major, minor, and patch components)

51.4.15 ISPATHLOCKED Procedure

This procedure checks if any user-level locks are applied on a given path.

Syntax

DBMS_DBFS_CONTENT.ISPATHLOCKED (
   store_name     IN     VARCHAR2,
   path           IN     VARCHAR2,
   who            IN     VARCHAR2,
   lock_type      IN OUT INTEGER,
   ctx            IN     DBMS_DBFS_CONTENT_CONTEXT_T);  

Parameters

Table 51-17 ISPATHLOCKED Procedure Parameters

Parameter Description

store_name

Name of store

path

Path name of items to be locked

who

Transaction identifier that has locked the path

lock_type

One of the available lock types (see Table 50-6)

ctx

Context with which to access the path items (see DBMS_DBFS_CONTENT_CONTEXT_T Object Type)

51.4.16 LIST Function

This function lists the contents of a directory path name.

The invoker of the subprogram has the option to investigate recursively into sub-directories, to make soft-deleted items visible, to use a flashback "as of" a specified timestamp, and to filter items within the store based on list predicates.

Syntax

DBMS_DBFS_CONTENT_SPI.LIST (
   store_name    IN     VARCHAR2,
   path          IN     VARCHAR2,
   filter        IN     VARCHAR2,
   recurse       IN     INTEGER,
   ctx           IN     DBMS_DBFS_CONTENT_CONTEXT_T)
  RETURN  DBMS_DBFS_CONTENT_LIST_ITEMS_T PIPELINED;

Parameters

Table 51-18 LIST Function Parameters

Parameter Description

store_name

Name of repository

path

Name of path to directories

filter

A filter, if any, to be applied

recurse

If 0, do not execute recursively. Otherwise, recursively list the contents of directories and files below the given directory.

ctx

Context with which to access the path items (see DBMS_DBFS_CONTENT_CONTEXT_T Object Type)

Return Values

Path items found that match the path, filter and criteria for executing recursively (see DBMS_DBFS_CONTENT_LIST_ITEMS_T Table Type)

Usage Notes

This function returns only list items; the client is expected to explicitly use one of the GETPATH Procedures to access the properties or content associated with an item.

51.4.17 LOCKPATH Procedure

This procedure applies user-level locks to the given valid path name (subject to store feature support), and optionally associates user-data with the lock.

Syntax

DBMS_DBFS_CONTENT_SPI.LOCKPATH (
   store_name     IN     VARCHAR2,
   path           IN     VARCHAR2,
   who            IN     VARCHAR2,
   lock_type      IN     INTEGER,
   waitForRowLock IN     INTEGER,
   ctx            IN     DBMS_DBFS_CONTENT_CONTEXT_T);

Parameters

Table 51-19 LOCKPATH Procedure Parameters

Parameter Description

store_name

Name of store

path

Path name of items to be locked

who

Transaction identifier that has locked the path

lock_type

One of the available lock types (see Table 50-6)

waitForRowLock

Determines if a row is locked by a transaction or not

ctx

Context with which to access the path items (see DBMS_DBFS_CONTENT_CONTEXT_T Object Type)

Usage Notes

  • It is the responsibility of the store and its providers (assuming it supports user-defined lock checking) to ensure that lock and unlock operations are performed in a consistent manner.

  • The status of locked items is available by means of various optional properties (see OPT_LOCK* in Table 50-8).

51.4.18 PURGEALL Procedure

This procedure purges all soft-deleted entries matching the path and optional filter criteria.

Syntax

DBMS_DBFS_CONTENT_SPI.PURGEALL (
   store_name     IN      VARCHAR2,
   path           IN      VARCHAR2,
   filter         IN      VARCHAR2,
   ctx            IN      DBMS_DBFS_CONTENT_CONTEXT_T);

Parameters

Table 51-20 PURGEALL Procedure Parameters

Parameter Description

store_name

Name of store

path

Name of path to file items

filter

A filter, if any, to be applied based on specified criteria

ctx

Context with which to access the path items (see DBMS_DBFS_CONTENT_CONTEXT_T Object Type)

51.4.19 PURGEPATH Procedure

This procedure purges any soft-deleted versions of the given path item.

Syntax

DBMS_DBFS_CONTENT_SPI.PURGEPATH (
   path           IN      VARCHAR2,
   filter         IN      VARCHAR2,
   store_name     IN      VARCHAR2,
   ctx            IN      DBMS_DBFS_CONTENT_CONTEXT_T);

Parameters

Table 51-21 PURGEPATH Procedure Parameters

Parameter Description

store_name

Name of store

path

Name of path to file items

filter

A filter, if any, to be applied

ctx

Context with which to access the path items (see DBMS_DBFS_CONTENT_CONTEXT_T Object Type)

51.4.20 PUTPATH Procedures

This procedure creates a new path item.

Syntax

DBMS_DBFS_CONTENT_SPI.PUTPATH (
   store_name    IN              VARCHAR2,
   path          IN              VARCHAR2,
   properties    IN OUT NOCOPY   DBMS_DBFS_CONTENT_PROPERTIES_T,
   content       IN OUT NOCOPY   BLOB,
   item_type     OUT             INTEGER,
   prop_flags    IN              INTEGER,
   ctx           IN              DBMS_DBFS_CONTENT_CONTEXT_T);

DBMS_DBFS_CONTENT_SPI.PUTPATH (
   store_name    IN              VARCHAR2,
   path          IN              VARCHAR2,
   properties    IN OUT NOCOPY   DBMS_DBFS_CONTENT_PROPERTIES_T,
   amount        IN              NUMBER,
   offset        IN              NUMBER,
   buffer        IN              RAW,
   prop_flags    IN              INTEGER,
   ctx           IN              DBMS_DBFS_CONTENT_CONTEXT_T);

DBMS_DBFS_CONTENT_SPI.PUTPATH (
   store_name    IN              VARCHAR2,
   path          IN              VARCHAR2,
   properties    IN OUT NOCOPY   DBMS_DBFS_CONTENT_PROPERTIES_T,
   written       OUT             NUMBER,
   offset        IN              NUMBER,
   buffers       IN              DBMS_DBFS_CONTENT_RAW_T,
   prop_flags    IN              INTEGER,
   ctx           IN              DBMS_DBFS_CONTENT_CONTEXT_T);

Parameters

Table 51-22 PUTPATH Procedure Parameters

Parameter Description

store_name

Name of store

path

Path name of item to be put

properties

One or more properties and their values to be set depending on prop_flags (see DBMS_DBFS_CONTENT_PROPERTIES_T Table Type)

content

BLOB holding data which populates the file (optional)

item_type

Type of the path item specified (see Table 50-4)

amount

Number of bytes to be read

written

Number of bytes written

offset

Byte offset from which to begin reading

buffer

Buffer to which to write

buffers

Buffers to which to write

prop_flags

Determines which properties are set. Default is PROP_STD. Specify properties to be returned by setting prop_spec, and providing an instance of the DBMS_DBFS_CONTENT_PROPERTIES_T Table Type with properties whose values are of interest.

ctx

Context with which to access the path items (see DBMS_DBFS_CONTENT_CONTEXT_T Object Type)

Usage Notes

  • All path names allow their metadata (properties) to be read and modified. On completion of the call, the client can access specific properties using prop_flags (see Table 50-9).

  • On completion of the call, the client can request a new BLOB locator that can be used to continue data access using the prop_data bitmask in prop_flags (see Table 50-9).

  • Files can also be written without using BLOB locators, by explicitly specifying logical offsets or buffer-amounts, and a suitably sized buffer.

51.4.21 RENAMEPATH Procedure

This procedure renames or moves a path. This operation can be performed across directory hierarchies and mount-points as long as it is within the same store.

Note:

See Oracle Database SecureFiles and Large Objects Developer's Guide for further information on Rename and Move operations

Syntax

DBMS_DBFS_CONTENT_SPI.RENAMEPATH (
   store_name    IN              VARCHAR2,
   oldPath       IN              VARCHAR2,
   newPath       IN              VARCHAR2,
   properties    IN OUT NOCOPY   DBMS_DBFS_CONTENT_PROPERTIES_T,
   ctx           IN              DBMS_DBFS_CONTENT_CONTEXT_T);

Parameters

Table 51-23 RENAMEPATH Procedure Parameters

Parameter Description

store_name

Name of store, must be unique

oldPath

Name of path prior to renaming

newPath

Name of path after renaming

properties

One or more properties and their values to be set depending on prop_flags (see DBMS_DBFS_CONTENT_PROPERTIES_T Table Type)

ctx

Context with which to access the path items (see DBMS_DBFS_CONTENT_CONTEXT_T Object Type)

51.4.22 RESTOREALL Procedure

This procedure restores all soft-deleted path items meeting the path and optional filter criteria.

Syntax

DBMS_DBFS_CONTENT_SPI.RESTOREALL (
   store_name     IN      VARCHAR2,
   path           IN      VARCHAR2,
   filter         IN      VARCHAR2,
   ctx            IN      DBMS_DBFS_CONTENT_CONTEXT_T);

Parameters

Table 51-24 RESTOREALL Procedure Parameters

Parameter Description

store_name

Name of store

path

Name of path to path items

filter

A filter, if any, to be applied

ctx

Context with which to access the path items (see DBMS_DBFS_CONTENT_CONTEXT_T Object Type)

51.4.23 RESTOREPATH Procedure

This procedure restores all soft-deleted path items that match the given path and optional filter criteria.

Syntax

DBMS_DBFS_CONTENT_SPI.RESTOREPATH (
   store_name     IN      VARCHAR2,
   path           IN      VARCHAR2,
   filter         IN      VARCHAR2,
   ctx            IN      DBMS_DBFS_CONTENT_CONTEXT_T);

Parameters

Table 51-25 RESTOREPATH Procedure Parameters

Parameter Description

store_name

Name of store

path

Name of path to path items

filter

A filter, if any, to be applied

ctx

Context with which to access the path items (see DBMS_DBFS_CONTENT_CONTEXT_T Object Type)

51.4.24 SEARCH Function

This function searches for path items matching the given path and filter criteria.

Syntax

DBMS_DBFS_CONTENT_SPI.SEARCH (
   store_name     IN      VARCHAR2,
   path           IN      VARCHAR2,
   filter         IN      VARCHAR2,
   recurse        IN      INTEGER,
   ctx            IN      DBMS_DBFS_CONTENT_CONTEXT_T)
 RETURN  DBMS_DBFS_CONTENT_LIST_ITEMS_T PIPELINED;

Parameters

Table 51-26 LIST Function Parameters

Parameter Description

store_name

Name of store

path

Name of path to the path items

filter

A filter, if any, to be applied

recurse

If 0, do not execute recursively. Otherwise, recursively search the contents of directories and files below the given directory.

ctx

Context with which to access the path items (see DBMS_DBFS_CONTENT_CONTEXT_T Object Type)

Return Values

Path items matching the given path and filter criteria (see DBMS_DBFS_CONTENT_LIST_ITEMS_T Table Type)

51.4.25 SETPATH Procedure

This procedure assigns a path name to a path item represented by contentID.

Stores and their providers that support contentID-based access and lazy path name binding also support the SETPATH Procedure that associates an existing contentID with a new path.

Note:

See Oracle Database SecureFiles and Large Objects Developer's Guide for further information on Rename and Move operations

Syntax

DBMS_DBFS_CONTENT_SPI.SETPATH (
   store_name    IN              VARCHAR2,
   contentID     IN              RAW,
   path          IN              VARCHAR2,
   properties    IN OUT NOCOPY   DBMS_DBFS_CONTENT_PROPERTIES_T,
   ctx           IN              DBMS_DBFS_CONTENT_CONTEXT_T);

Parameters

Table 51-27 SETPATH Procedure Parameters

Parameter Description

store_name

Name of the store

contentID

Unique identifier for the item to be associated

path

Name of path to path item

properties

One or more properties and their values to be set depending on prop_flags (see DBMS_DBFS_CONTENT_PROPERTIES_T Table Type)

ctx

Context with which to access the path items (seE DBMS_DBFS_CONTENT_CONTEXT_T Object Type)

51.4.26 SPACEUSAGE Procedure

This procedure queries file system space usage statistics.

Providers are expected to support this subprogram for their stores and to make a best effort determination of space usage, especially if the store consists of multiple tables, indexes, LOBs, and so on.

Syntax

DBMS_DBFS_CONTENT_SPI.SPACEUSAGE (
   store_name    IN        VARCHAR2,
   blksize       OUT       INTEGER,
   tbytes        OUT       INTEGER,
   fbytes        OUT       INTEGER,
   nfile         OUT       INTEGER,
   ndir          OUT       INTEGER,
   nlink         OUT       INTEGER,
   nref          OUT       INTEGER);

Parameters

Table 51-28 SPACEUSAGE Procedure Parameters

Parameter Description

store_name

Name of store

blksize

Natural tablespace blocksize that holds the store. If multiple tablespaces with different blocksizes are used, any valid blocksize is acceptable.

tbytes

Total size of the store in bytes computed over all segments that comprise the store

fbytes

Free or unused size of the store in bytes computed over all segments that comprise the store

nfile

Number of currently available files in the store

ndir

Number of currently available directories in the store

nlink

Number of currently available links in the store

nref

Number of currently available references in the store

Usage Notes

  • A space usage query on the top-level root directory returns a combined summary of the space usage of all available distinct stores under it (if the same store is mounted multiple times, it is still counted only once).

  • Since database objects are dynamically expandable, it is not easy to estimate the division between "free" space and "used" space.

51.4.27 UNLOCKPATH Procedure

This procedure unlocks path items that were previously locked with the LOCKPATH Procedure.

Syntax

DBMS_DBFS_CONTENT_SPI.UNLOCKPATH (
   store_name     IN     VARCHAR2,
   path           IN     VARCHAR2,
   who            IN     VARCHAR2,
   waitForRowLock IN     INTEGER,
   ctx            IN     DBMS_DBFS_CONTENT_CONTEXT_T);

Parameters

Table 51-29 UNLOCKPATH Procedure Parameters

Parameter Description

store_name

Name of store

path

Name of path to the path items

who

Transaction identifier that has locked the path

waitForRowLock

Determines if a row is locked by a transaction or not

ctx

Context with which to access the path items (see DBMS_DBFS_CONTENT_CONTEXT_T Object Type)

Related Topics