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Oracle® Database PL/SQL Packages and Types Reference
11g Release 2 (11.2)

Part Number E16760-04
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48 DBMS_DBFS_CONTENT_SPI

The DBMS_DBFS_CONTENT_SPI package provides the Application Programming Interface (API) specification for DBMS_DBFS_CONTENT service providers. Application designers can create PL/SQL packages conforming to this API to extend DBMS_CONTENT to utilize custom service providers.

See Also:

This chapter contains the following topics:


Using DBMS_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 service 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_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_CONTENT interface.

Additionally, there is an almost one-to-one correspondence between the client API exported by the DBMS_CONTENT interface and the provider interface that the DBMS_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_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.


Security Model

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


Operational Notes

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 service 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 DBMS_DBFS_CONTENT Constants - Store Features) 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 (seeDBMS_DBFS_CONTENT Constants - Optional Properties) property.

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

Creation Operations

The provider SPI must allow the DBFS content API to create directory, file, link, and reference elements subject to store feature support.

All of the creation subprograms require a valid path name, but note the special exemption for contentID-based access. Creation subprograms can optionally specify properties to be associated with the path name as it is created. It is also possible for clients to returns item properties after the creation completes so that automatically generated properties, such as STD_CREATION_TIME (see DBMS_DBFS_CONTENT Constants - Standard Properties) are immediately available to clients. The exact set of properties fetched back is controlled by the various PROP_XXX bitmasks in the prop_flags parameter.

Links and references require an additional path name to associate with the primary path name.

File path names can optionally specify a BLOB value to use to initially populate the underlying file content (the provided BLOB may be any valid LOB). On creation, the underlying LOB is returned to the client, provided that PROP_DATA is specified in the prop_flags parameter.

Non-directory path names require that their parent directory be created first. Directory path names themselves can be recursively created with the path name hierarchy leading up to a directory created in one call.

Attempts to create paths that already exist is an error; the sole exception is path names that are "soft-deleted" (as discussed in the context of Deletion Operations) In these cases, the soft-deleted item is implicitly purged, and the new item creation is attempted.

Stores and their providers that support contentID-based access accept an explicit store name and a NULL path to create a new content element. The contentID generated for this element is available by means of the OPT_CONTENT_ID property (see DBMS_DBFS_CONTENT Constants - Optional Properties), contentID-based creation being automatically implied by PROP_OPT property in the prop_flags parameter).

The newly created element may also have an internally generated path name if FEATURE_LAZY_PATH property is not supported (see DBMS_DBFS_CONTENT Constants - Store Features) and this path is available by way of the STD_CANONICAL_PATH property (see DBMS_DBFS_CONTENT Constants - Standard Properties).

Only file elements are candidates for contentID-based access.

Deletion Operations

The provider SPI must allow the DBFS content API to delete directory, file, link, and reference elements (subject to store feature support).

By default, the deletions are permanent, removing the successfully deleted items on transaction commit, but stores may also support "soft-delete" features. If requested by the client, soft-deleted items are retained by the store, although they are not typically visible in normal listings or searches.

Soft-deleted items can be restored, or explicitly purged.

Directory path names can be recursively deleted, with the path name hierarchy below a directory deleted in one call. Non-recursive deletions can be performed only on empty directories. Recursive soft-deletions apply the soft-delete to all of the items being deleted.

Individual path names, as well as all soft-deleted path names under a directory, can be restored or purged by means of the various restore and purge subprograms.

Providers that support filtering can use the provider filter to identify subsets of items to delete. This makes most sense for bulk operations such as the DELETEDIRECTORY Procedure, PURGEALL Procedure, and RESTOREALL Procedure, but all of the deletion-related operations accept a filter argument.

Stores and their providers that support contentID-based access can also allow file items to be deleted by specifying their contentID.

Get (Retrieve) and Put (Insert) Operations

Existing path items can be accessed (for query or for update) and modified using simple get and put subprograms. All path names allow their metadata (properties) to be read and modified. On completion of the call, the client can request specific properties to be fetched by means of the prop_flags parameter.

File path names allow their data (content) to be read and modified. On completion of the call, the client can use the PROP_DATA bitmasks in the prop_flags parameter to request a new BLOB locator to continue data access.

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

Update accesses must specify the forUpdate flag. Access to link path names can be implicitly and internally de-referenced by stores (subject to feature support) if the deref flag is specified, however, this may have undetermined outcomes since symbolic links are not always resolvable.

The read methods, such as the GETPATH Procedures where forUpdate is specified as 0, also accepts a valid asof timestamp in the ctx parameter that can be used by stores to implement "as of" style flashback queries. Mutating versions of the GETPATH Procedures and the PUTPATH Procedures methods do not support "as of" modes of operation.

The GETPATHNOWAIT Procedure implies that the operation is for an update, and, if implemented (see FEATURE_NOWAIT in DBMS_DBFS_CONTENT Constants - Store Features), this allows providers to return an exception (ORA-00054) rather than wait for row locks.

Rename and Move Operations

Path names can be renamed or moved, possibly across directory hierarchies and mount-points, but within the same store.

Non-directory path names previously accessible by way of specifying the oldPath parameter are renamed as a single item subsequently accessible by specifying newPath, assuming that newPath does not already exist.

If newPath exists and is not a directory, the action of renaming implicitly deletes the existing item before renaming oldPath. If the newPath exists and is a directory, oldPath is moved into the target directory.

Directory path names previously accessible by way of oldPath are renamed by moving the directory and all of its children to newPath (if it does not already exist) or as children of newPath (if it exists and is a directory).

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".

Directory Navigation and Search

The DBMS_CONTENT interface can list or search the contents of directory path names, with the option of doing so recursively into sub-directories, optionally seeing soft-deleted items, optionally using flashback "as of" a provided timestamp, and optionally filtering items in or out within the store based on list or search predicates.

Locking Operations

Clients of the DBMS_CONTENT interface can apply user-level locks to any valid path name (subject to store feature support), associate the lock with user-data, and subsequently unlock these path names.

The status of locked items is available using various optional properties (note the previous discussion regarding opt_lock).

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

Access Check Operation

This operation ascertains if a given path name (store_name, path, pathtype) can be manipulated by operation (see the various DBMS_CONTENT.OP_XXX opcodes in DBMS_DBFS_CONTENT Constants - Optional Properties) by the user acting on the store utilizing the principal parameter. This is a convenience function for the DBMS_CONTENT interface; a store that supports access control still internally performs these checks to guarantee security.


Summary of DBMS_DBFS_CONTENT_SPI Subprograms

Table 48-1 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



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 48-2 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 DBMS_DBFS_CONTENT Constants - Path Name Types)

operation

Operation to be checked (see DBMS_DBFS_CONTENT Constants - Optional Properties)

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.


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_CONTENT_PROPERTIES_T,
   prop_flags  IN              INTEGER,
   recurse     IN              INTEGER,
   ctx         IN              DBMS_CONTENT_CONTEXT_T);

Parameters

Table 48-3 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 DBMS_DBFS_CONTENT Constants - Property Access Flags), 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)



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_CONTENT_PROPERTIES_T,
   content       IN OUT NOCOPY   BLOB,
   prop_flags    IN              INTEGER,
   ctx           IN              DBMS_CONTENT_CONTEXT_T);

Parameters

Table 48-4 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)



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_CONTENT_PROPERTIES_T,
   prop_flags    IN              INTEGER,
   ctx           IN              DBMS_CONTENT_CONTEXT_T);

Parameters

Table 48-5 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)



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_CONTENT_PROPERTIES_T,
   prop_flags    IN              INTEGER,
   store_name    IN              VARCHAR2,
   ctx           IN              DBMS_CONTENT_CONTEXT_T);

Parameters

Table 48-6 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)



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_CONTENT_CONTEXT_T);

Parameters

Table 48-7 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 "Deletion Operations").

ctx

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



DELETEDIRECTORY Procedure

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

Syntax

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_CONTENT_CONTEXT_T);

Parameters

Table 48-8 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 "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)



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_CONTENT_CONTEXT_T);

Parameters

Table 48-9 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 "Deletion Operations").

ctx

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



GETFEATURES Function

This function returns the features of a store.

Syntax

DBMS_DBFS_CONTENT_SPI.GETFEATURES (
   store_name          IN      VARCHAR2)
  RETURN  INTEGER;

Parameters

Table 48-10 GETFEATURES Function Parameters

Parameter Description

store_name

Name of store


Return Values

DBMS_CONTENT.FEATURE_* features supported by the Service Provider


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 DBMS_DBFS_CONTENT Constants - Property Access Flags) 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_CONTENT_PROPERTIES_T,
   content     OUT    NOCOPY   BLOB,
   item_type   OUT             INTEGER,
   prop_flags  IN              INTEGER,
   forUpdate   IN              INTEGER,
   deref       IN              INTEGER,
   ctx         IN              DBMS_CONTENT_CONTEXT_T);

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

DBMS_DBFS_CONTENT_SPI.GETPATH (
   store_name  IN              VARCHAR2,
   path        IN              VARCHAR2,
   properties  IN OUT NOCOPY   DBMS_CONTENT_PROPERTIES_T,
   amount      IN OUT          NUMBER,
   offset      IN              NUMBER,
   buffers     OUT    NOCOPY   DBMS_CONTENT_RAW_T,
   prop_flags  IN              INTEGER,
   ctx         IN              DBMS_CONTENT_CONTEXT_T);

Parameters

Table 48-11 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 DBMS_DBFS_CONTENT Constants - Path Name Types)

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)



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 48-12 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.


GETPATHNOWAIT Procedure

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

Syntax

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

Parameters

Table 48-13 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 DBMS_DBFS_CONTENT Constants - Path Name Types)

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)



GETSTOREID Function

This function returns the ID of a store.

Syntax

DBMS_DBFS_CONTENT_SPI.GETSTOREID (
   store_name          IN      VARCHAR2)
  RETURN  NUMBER;

Parameters

Table 48-14 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.


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 48-15 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)


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_CONTENT_CONTEXT_T)
  RETURN  DBMS_CONTENT_LIST_ITEMS_T PIPELINED;

Parameters

Table 48-16 LIST Function Parameters

Parameter Description

store_name

Name of respository

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.


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,
   lock_type      IN     INTEGER,
   lock_data      IN     VARCHAR2,
   ctx            IN     DBMS_CONTENT_CONTEXT_T);

Parameters

Table 48-17 LOCKPATH Procedure Parameters

Parameter Description

store_name

Name of store

path

Path name of items to be locked

lock_type

One of the available lock types (see DBMS_DBFS_CONTENT Constants - Lock Types)

lock_data

Optional user data to be associated with the lock

ctx

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


Usage Notes


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_CONTENT_CONTEXT_T);

Parameters

Table 48-18 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)



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_CONTENT_CONTEXT_T);

Parameters

Table 48-19 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)



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_CONTENT_PROPERTIES_T,
   content       IN OUT NOCOPY   BLOB,
   item_type     OUT             INTEGER,
   prop_flags    IN              INTEGER,
   ctx           IN              DBMS_CONTENT_CONTEXT_T);

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

DBMS_DBFS_CONTENT_SPI.PUTPATH (
   store_name    IN              VARCHAR2,
   path          IN              VARCHAR2,
   properties    IN OUT NOCOPY   DBMS_CONTENT_PROPERTIES_T,
   written       OUT             NUMBER,
   offset        IN              NUMBER,
   buffers       IN              DBMS_CONTENT_RAW_T,
   prop_flags    IN              INTEGER,
   ctx           IN              DBMS_CONTENT_CONTEXT_T);

Parameters

Table 48-20 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 DBMS_DBFS_CONTENT Constants - Path Name Types)

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


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.

Syntax

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

Parameters

Table 48-21 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)



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_CONTENT_CONTEXT_T);

Parameters

Table 48-22 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)



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_CONTENT_CONTEXT_T);

Parameters

Table 48-23 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)



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_CONTENT_CONTEXT_T)
 RETURN  DBMS_CONTENT_LIST_ITEMS_T PIPELINED;

Parameters

Table 48-24 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)


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.

Syntax

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

Parameters

Table 48-25 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)



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 48-26 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


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,
   ctx            IN     DBMS_CONTENT_CONTEXT_T);

Parameters

Table 48-27 UNLOCKPATH Procedure Parameters

Parameter Description

store_name

Name of store

path

Name of path to the path items

ctx

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