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Oracle® XML DB Developer's Guide
10g Release 2 (10.2)

Part Number B14259-02
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23 PL/SQL Access Using DBMS_XDB

This chapter describes the Oracle XML DB resource application program interface (API) for PL/SQL (PL/SQL package DBMS_XDB). It contains these topics:

Overview of PL/SQL Package DBMS_XDB

PL/SQL package DBMS_XDB is the Oracle XML DB resource application program interface (API) for PL/SQL. It is also known as the PL/SQL foldering API. This API provides functions and procedures to access and manage Oracle XML DB Repository resources using PL/SQL. It includes methods for managing resource security and Oracle XML DB configuration.

Oracle XML DB Repository is modeled on XML, and provides a database file system for any data. The repository maps path names (or URLs) onto database objects of XMLType and provides management facilities for these objects.

PL/SQL package DBMS_XDB is an API that you can use to manage all of the following:

DBMS_XDB: Resource Management

Table 23-1 describes the DBMS_XDB Oracle XML DB resource management functions and procedures.

Table 23-1 DBMS_XDB Resource Management Functions and Procedures

Function/Procedure Description

appendResourceMetadata

Adds user-defined metadata to a resource.

createFolder

Creates a new folder resource.

createOIDPath

Creates a virtual path to a resource, based on its object identifier (OID).

createResource

Creates a new file resource.

deleteResource

Deletes a resource from the repository.

deleteResourceMetadata

Deletes specific user-defined metadata from a resource.

existsResource

Indicates whether or not a resource exists, given its absolute path.

getLockToken

Returns a resource lock token for the current user, given a path to the resource.

getResOID

Returns the object identifier (OID) of a resource, given its absolute path.

getXDB_tablespace

Returns the current tablespace of user XDB.

link

Creates a link to an existing resource.

lockResource

Obtains a WebDAV-style lock on a resource, given a path to the resource.

moveXDB_tablespace

Moves user XDB to the specified tablespace.

purgeResourceMetadata

Deletes all user-defined metadata from a resource.

rebuildHierarchicalIndex

Rebuilds the repository hierarchical index, after import or export operations.

renameResource

Renames a resource.

unlockResource

Unlocks a resource, given its lock token and path.

updateResourceMetadata

Modifies user-defined resource metadata.


The examples in this section illustrate the use of these functions and procedures.

Example 23-1 Using DBMS_XDB to Manage Resources

This example uses package DBMS_XDB to manage repository resources. It creates the following:

  • a folder, mydocs, under folder /public

  • two file resources, emp_selby.xml and emp_david.xml

  • two links to the file resources, person_selby.xml and person_david.xml

It then deletes each of the newly created resources and links. The folder contents are deleted before the folder itself.

DECLARE
  retb BOOLEAN;
BEGIN
  retb := DBMS_XDB.createfolder('/public/mydocs');
  retb := DBMS_XDB.createresource('/public/mydocs/emp_selby.xml',
                                  '<emp_name>selby</emp_name>');
  retb := DBMS_XDB.createresource('/public/mydocs/emp_david.xml',
                                  '<emp_name>david</emp_name>');
END;
/
PL/SQL procedure successfully completed.
 
CALL DBMS_XDB.link('/public/mydocs/emp_selby.xml',
                   '/public/mydocs',
                   'person_selby.xml');
Call completed.
 
CALL DBMS_XDB.link('/public/mydocs/emp_david.xml',
                   '/public/mydocs',
                   'person_david.xml');
Call completed.
 
CALL DBMS_XDB.deleteresource('/public/mydocs/emp_selby.xml');
Call completed.
 
CALL DBMS_XDB.deleteresource('/public/mydocs/person_selby.xml');
Call completed.
 
CALL DBMS_XDB.deleteresource('/public/mydocs/emp_david.xml');
Call completed.
 
CALL DBMS_XDB.deleteresource('/public/mydocs/person_david.xml');
Call completed.
 
CALL DBMS_XDB.deleteresource('/public/mydocs');
Call completed.

See Also:

Chapter 26, "User-Defined Repository Metadata" for examples using appendResourceMetadata and deleteResourceMetadata

DBMS_XDB: ACL-Based Security Management

Table 23-2 lists the DBMS_XDB Oracle XML DB ACL- based security management functions and procedures.

Table 23-2 DBMS_XDB: Security Management Procedures and Functions

Function/Procedure Description

ACLCheckPrivileges

Checks the access privileges granted to the current user by an ACL.

changePrivileges

Adds an ACE to a resource ACL.

checkPrivileges

Checks the access privileges granted to the current user for a resource.

getACLDocument

Retrieves the ACL document that protects a resource, given the path name of the resource.

getPrivileges

Returns all privileges granted to the current user for a resource.

setACL

Sets the ACL on a resource.


The examples in this section illustrate the use of these functions and procedures.

Example 23-2 Using Procedure DBMS_XDB.getACLDocument

In this example, database sample-schema user hr creates two resources: a folder, /public/mydocs, with a file in it, emp_selby.xml. Procedure getACLDocument is called on the file resource, showing that the <principal> user for the document is PUBLIC.

CONNECT HR/HR
Connected.

DECLARE
  retb BOOLEAN;
BEGIN
  retb := DBMS_XDB.createFolder('/public/mydocs');
  retb := DBMS_XDB.createResource('/public/mydocs/emp_selby.xml',
                                  '<emp_name>selby</emp_name>');
END;
/
PL/SQL procedure successfully completed.
 
SELECT DBMS_XDB.getACLDocument('/public/mydocs/emp_selby.xml').getClobVal()
  FROM DUAL;
 
DBMS_XDB.GETACLDOCUMENT('/PUBLIC/MYDOCS/EMP_SELBY.XML').GETCLOBVAL()
--------------------------------------------------------------------------------
<acl description="Public:All privileges to PUBLIC" xmlns="http://xmlns.oracle.co
m/xdb/acl.xsd" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaL
ocation="http://xmlns.oracle.com/xdb/acl.xsd                           http://xm
lns.oracle.com/xdb/acl.xsd">
  <ace>
    <principal>PUBLIC</principal>
    <grant>true</grant>
    <privilege>
      <all/>
    </privilege>
  </ace>
</acl>
 
1 row selected.

Example 23-3 Using Procedure DBMS_XDB.setACL

In this example, the system manager connects and uses procedure setACL to give the owner (hr) all privileges on the file resource created in Example 23-2. Procedure getACLDocument then shows that the <principal> user is dav:owner, the owner (hr).

CONNECT SYSTEM/MANAGER
Connected.
 
-- Give all privileges to owner, HR.
CALL DBMS_XDB.setACL('/public/mydocs/emp_selby.xml',
                     '/sys/acls/all_owner_acl.xml');
Call completed.
COMMIT;
Commit complete.
 
SELECT DBMS_XDB.getACLDocument('/public/mydocs/emp_selby.xml').getClobVal()
  FROM DUAL;

DBMS_XDB.GETACLDOCUMENT('/PUBLIC/MYDOCS/EMP_SELBY.XML').GETCLOBVAL()
--------------------------------------------------------------------------------
<acl description="Private:All privileges to OWNER only and not accessible to oth
ers" xmlns="http://xmlns.oracle.com/xdb/acl.xsd" xmlns:dav="DAV:" xmlns:xsi="htt
p://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.oracle.
com/xdb/acl.xsd                           http://xmlns.oracle.com/xdb/acl.xsd">
  <ace>
    <principal>dav:owner</principal>
    <grant>true</grant>
    <privilege>
      <all/>
    </privilege>
  </ace>
</acl>
 
1 row selected.

Example 23-4 Using Function DBMS_XDB.changePrivileges

In this example, user hr connects and uses function changePrivileges to add a new access control entry (ACE) to the ACL, which gives all privileges on resource emp_selby.xml to user oe. Procedure getACLDocument shows that the new ACE was added to the ACL.

CONNECT HR/HR
Connected.

SET SERVEROUTPUT ON

-- Add an ACE giving privileges to user OE
DECLARE
  r        PLS_INTEGER;
  ace      XMLType;
  ace_data VARCHAR2(2000);
BEGIN
  ace_data := '<ace xmlns="http://xmlns.oracle.com/xdb/acl.xsd"
                    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
                    xsi:schemaLocation="http://xmlns.oracle.com/xdb/acl.xsd
                                        http://xmlns.oracle.com/xdb/acl.xsd
                                        DAV:http://xmlns.oracle.com/xdb/dav.xsd">
                 <principal>OE</principal>
                 <grant>true</grant>
                 <privilege><all/></privilege>
               </ace>';
  ace := XMLType.createXML(ace_data);
  r := DBMS_XDB.changePrivileges('/public/mydocs/emp_selby.xml', ace);
END;
/
 
PL/SQL procedure successfully completed.

SELECT DBMS_XDB.getACLDocument('/public/mydocs/emp_selby.xml').getClobVal()
  FROM DUAL;
 
DBMS_XDB.GETACLDOCUMENT('/PUBLIC/MYDOCS/EMP_SELBY.XML').GETCLOBVAL()
--------------------------------------------------------------------------------
<acl description="Private:All privileges to OWNER only and not accessible to oth
ers" xmlns="http://xmlns.oracle.com/xdb/acl.xsd" xmlns:dav="DAV:" xmlns:xsi="htt
p://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.oracle.
com/xdb/acl.xsd                           http://xmlns.oracle.com/xdb/acl.xsd" s
hared="false">
  <ace>
    <principal>dav:owner</principal>
    <grant>true</grant>
    <privilege>
      <all/>
    </privilege>
  </ace>
  <ace>
    <principal>OE</principal>
    <grant>true</grant>
    <privilege>
      <all/>
    </privilege>
  </ace>
</acl>
 
1 row selected.

Example 23-5 Using Function DBMS_XDB.changePrivileges

In this example, user oe connects and calls DBMS_XDB.getPrivileges, which shows all of the privileges granted to user oe on resource emp_selby.xml.

CONNECT OE/OE
Connected.

SELECT DBMS_XDB.getPrivileges('/public/mydocs/emp_selby.xml') FROM DUAL;

DBMS_XDB.GETPRIVILEGES('/PUBLIC/MYDOCS/EMP_SELBY.XML').GETCLOBVAL()
--------------------------------------------------------------------------------
<privilege xmlns="http://xmlns.oracle.com/xdb/acl.xsd" xmlns:xsi="http://www.w3.
org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.oracle.com/xdb/acl
.xsd http://xmlns.oracle.com/xdb/acl.xsd DAV: http://xmlns.oracle.com/xdb/dav.xs
d" xmlns:xdbacl="http://xmlns.oracle.com/xdb/acl.xsd" xmlns:dav="DAV:">
  <read-properties/>
  <read-contents/>
  <update/>
  <link/>
  <unlink/>
  <read-acl/>
  <write-acl-ref/>
  <update-acl/>
  <resolve/>
  <link-to/>
  <unlink-from/>
  <dav:lock/>
  <dav:unlock/>
</privilege>
 
1 row selected.

DBMS_XDB: Configuration Management

Table 23-3 lists the DBMS_XDB Oracle XML DB configuration management functions and procedures.

Table 23-3 DBMS_XDB: Configuration Management Functions and Procedures

Function/Procedure Description

cfg_get

Returns the configuration information for the current session.

cfg_refresh

Refreshes the session configuration information using the current Oracle XML DB configuration file, xdbconfig.xml.

cfg_update

Updates the Oracle XML DB configuration information. This writes the configuration file, xdbconfig.xml.

getFTPPort

Returns the current FTP port number.

getHTTPPort

Returns the current HTTP port number.

setFTPPort

Sets the Oracle XML DB FTP port to the specified port number.

setHTTPPort

Sets the Oracle XML DB HTTP port to the specified port number.


The examples in this section illustrate the use of these functions and procedures.

Example 23-6 Using Function DBMS_XDB.cfg_get

In this example, function cfg_get is used to retrieve the Oracle XML DB configuration file, xdbconfig.xml.

CONNECT SYSTEM/MANAGER
Connected.

SELECT DBMS_XDB.cfg_get() FROM DUAL;
 
DBMS_XDB.CFG_GET()
--------------------------------------------------------------------------------
<xdbconfig xmlns="http://xmlns.oracle.com/xdb/xdbconfig.xsd" xmlns:xsi="http://w
ww.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.oracle.com/x
db/xdbconfig.xsd                                     http://xmlns.oracle.com/xdb
/xdbconfig.xsd">
  <sysconfig>
    <acl-max-age>900</acl-max-age>
    <acl-cache-size>32</acl-cache-size>
    <invalid-pathname-chars>,</invalid-pathname-chars>
    <case-sensitive>true</case-sensitive>
    <call-timeout>300</call-timeout>
    <max-link-queue>65536</max-link-queue>
    <max-session-use>100</max-session-use>
    <persistent-sessions>false</persistent-sessions>
    <default-lock-timeout>3600</default-lock-timeout>
    <xdbcore-logfile-path/>
    <xdbcore-log-level>0</xdbcore-log-level>
    <resource-view-cache-size>1048576</resource-view-cache-size>
    <protocolconfig>
      <common>
        . . .
      </common>
      <ftpconfig>
        . . .
      </ftpconfig>
      <httpconfig>
        <http-port>8000</http-port>
        <http-listener>local_listener</http-listener>
        <http-protocol>tcp</http-protocol>
        <max-http-headers>64</max-http-headers>
        <max-header-size>16384</max-header-size>
        <max-request-body>2000000000</max-request-body>
        <session-timeout>6000</session-timeout>
        <server-name>XDB HTTP Server</server-name>
        <logfile-path/>
        <log-level>0</log-level>
        <servlet-realm>Basic realm=&quot;XDB&quot;</servlet-realm>
        <webappconfig>
        . . .
        </webappconfig>
      </httpconfig>
    </protocolconfig>
    <xdbcore-xobmem-bound>1024</xdbcore-xobmem-bound>
    <xdbcore-loadableunit-size>16</xdbcore-loadableunit-size>
  </sysconfig>
</xdbconfig>
 
1 row selected.

Example 23-7 Using Procedure DBMS_XDB.cfg_update

This example illustrates the use of procedure cfg_update. The current configuration is retrieved as an XMLType instance and modified. It is then rewritten using cfg_update.

DECLARE
  configxml    SYS.XMLType;
  configxml2   SYS.XMLType;
BEGIN
  -- Get the current configuration
  configxml := DBMS_XDB.cfg_get();
 
  -- Modify the configuration
  SELECT updateXML(
           configxml,
           '/xdbconfig/sysconfig/protocolconfig/httpconfig/http-port/text()',
           '8000',
           'xmlns="http://xmlns.oracle.com/xdb/xdbconfig.xsd"')
    INTO configxml2 FROM DUAL;
 
  -- Update the configuration to use the modified version
  DBMS_XDB.cfg_update(configxml2);
END;
/
 
PL/SQL procedure successfully completed.

SELECT DBMS_XDB.cfg_get() FROM DUAL;
 
DBMS_XDB.CFG_GET()
--------------------------------------------------------------------------------
<xdbconfig xmlns="http://xmlns.oracle.com/xdb/xdbconfig.xsd" xmlns:xsi="http://w
ww.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.oracle.com/x
db/xdbconfig.xsd                                     http://xmlns.oracle.com/xdb
/xdbconfig.xsd">
  <sysconfig>
    <acl-max-age>900</acl-max-age>
    <acl-cache-size>32</acl-cache-size>
    <invalid-pathname-chars>,</invalid-pathname-chars>
    <case-sensitive>true</case-sensitive>
    <call-timeout>300</call-timeout>
    <max-link-queue>65536</max-link-queue>
    <max-session-use>100</max-session-use>
    <persistent-sessions>false</persistent-sessions>
    <default-lock-timeout>3600</default-lock-timeout>
    <xdbcore-logfile-path/>
    <xdbcore-log-level>0</xdbcore-log-level>
    <resource-view-cache-size>1048576</resource-view-cache-size>
    <protocolconfig>
      <common>
      . . .
      </common>
      <ftpconfig>
      . . .
      </ftpconfig>
      <httpconfig>
        <http-port>8000</http-port>
        . . .
      </httpconfig>
    </protocolconfig>
    <xdbcore-xobmem-bound>1024</xdbcore-xobmem-bound>
    <xdbcore-loadableunit-size>16</xdbcore-loadableunit-size>
  </sysconfig>
</xdbconfig>
 
1 row selected.