165 DBMS_XDB_VERSION

Using DBMS_XDB_VERSION

• Security Model

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Security Model

Owned by XDB, the DBMS_XDB_VERSION package must be created by SYS or XDB. The EXECUTE privilege is granted to PUBLIC. Subprograms in this package are executed using the privileges of the current user.

Summary of DBMS_XDB_VERSION Subprograms

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CHECKIN Function

This function checks in a checked-out VCR and returns the resource id of the newly-created version.

Syntax

DBMS_XDB_VERSION.CHECKIN(
   pathname VARCHAR2) 
 RETURN DBMS_XDB.resid_type;

Parameters

Usage Notes

This is not an auto-commit SQL operation. CHECKIN Function doesn't have to take the same path name that was passed to CHECKOUT Procedure operation. However, the CHECKIN Function path name and the CHECKOUT Procedure path name must be of the same resource for the operations to function correctly. If the resource has been renamed, the new name must be used to CHECKIN Function because the old name is either invalid or is currently bound with a different resource. Exception is raised if the path name does not exist. If the path name has been changed, the new path name must be used to CHECKIN Function the resource.

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CHECKOUT Procedure

This procedure checks out a VCR before updating or deleting it.

Syntax

DBMS_XDB_VERSION.Checkout(
   pathname    VARCHAR2);

Parameters

Usage Notes

This is not an auto-commit SQL operation. Two users of the same workspace cannot CHECKOUT Procedure the same VCR at the same time. If this happens, one user must rollback. As a result, it is good practice to commit the CHECKOUT Procedure operation before updating a resource and avoid loss of the update if the transaction is rolled back. An exception is raised if the given resource is not a VCR, if the VCR is already checked out, if the resource doesn't exist.

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GETCONTENTSBLOBBYRESID Function

This function obtain contents as a BLOB.

Syntax

DBMS_XDB_VERSION.GETCONTENTSBLOBYRESID(
   resid      DBMS_XDB.resid_type)
 RETURN BLOB;

Parameters

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GETCONTENTSCLOBBYRESID Function

This function obtains contents as a CLOB.

Syntax

DBMS_XDB_VERSION.GETCONTENTSCLOBYRESID(
   resid     DBMS_XDB.resid_type)
 RETURN CLOB;

Parameters

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GETCONTENTSXMLBYRESID Function

This function obtains contents as an XMLType.

Syntax

DBMS_XDB_VERSION.GETCONTENTSXMLBYRESID(
   resid      DBMS_XDB.resid_type)
 RETURN XMLType;

Parameters

Return Values

If the contents are not valid XML, returns NULL.

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GETPREDECESSORS Function

This function retrieves the list of predecessors by the path name.

Syntax

DBMS_XDB_VERSION.GETPREDECESSORS(
   pathname       VARCHAR2) 
 RETURN resid_list_type;

Parameters

Return Values

An exception is raised if pathname is illegal.

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GETPREDSBYRESID Function

This function retrieves the list of predecessors by resource id.

Syntax

DBMS_XDB_VERSION.GETPREDSBYRESID(
   resid      resid_type) 
 RETURN resid_list_type;

Parameters

Usage Notes

Getting predecessors by RESID is more efficient than by pathname.

Exceptions

An exception is raised if the RESID is illegal.

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GETRESOURCEBYRESID Function

This function obtains the resource as an XMLType, given the resource object ID. Because the system does not create a path name for versions, this function is useful for retrieving the resource using its resource id.

Syntax

DBMS_XDB_VERSION.GETRESOURCEBYRESID(
   resid      resid_type) 
 RETURN XMLType;

Parameters

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GETSUCCESSORS Function

Given a version resource or a VCR, this function retrieves the list of the successors of the resource by the path name.

Syntax

DBMS_XDB_VERSION.GETSUCCESSORS( 
   pathname VARCHAR2) 
 RETURN resid_list_type;

Parameters

Usage Notes

Getting successors by RESID is more efficient than by pathname.

Exceptions

An exception is raised if the pathname is illegal.

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GETSUCCSBYRESID Function

This function retrieves the list of the successors of the resource by resource id using version resource or VCR.

Syntax

DBMS_XDB_VERSION.GETSUCCSBYRESID(
   resid    resid_type) 
  RETURN resid_list_type;

Parameters

Usage Notes

Getting successors by RESID is more efficient than by pathname.

Exceptions

An exception is raised if the pathname is illegal.

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MAKEVERSIONED Function

This function turns a regular resource whose path name is given into a version-controlled resource. This new resource is then put under version control. All other path names continue to refer to the original resource.

Syntax

DBMS_XDB_VERSION.MAKEVERSIONED(
   pathname   VARCHAR2) 
 RETURN DBMS_XDB.resid_type;

Parameters

Return Values

This function returns the resource ID of the first version, or root, of the VCR.

Usage Notes

If two or more path names are bound with the same resource, a copy of the resource is created, and the given path name is bound with the newly-created copy.

This is not an auto-commit SQL operation. An exception is raised if the resource doesn't exist.

• This call is legal for VCR, and neither exception nor warning is raised.

• This call is illegal for folder, version history, version resource, and ACL.

• No support for Schema-based resources is provided.

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UNCHECKOUT Function

This function checks-in a checked-out resource and returns the resource id of the version before the resource is checked out.

Syntax

DBMS_XDB_VERSION.UNCHECKOUT(
   pathname    VARCHAR2) 
 RETURN DBMS_XDB.resid_type;

Parameters

Usage Notes

This is not an auto-commit SQL operation. The UNCHECKOUT Function does not have to take the same path name that was passed to the operation by the CHECKOUT Procedure. However, the UNCHECKOUT Function path name and the CHECKOUT Procedure path name must be of the same resource for the operations to function correctly. If the resource has been renamed, the new name must be used to UNCHECKOUT Function, because the old name is either invalid or is currently bound with a different resource. If the path name has been changed, the new path name must be used to UNCHECKOUT Function the resource.

Exceptions

An exception is raised if the path name doesn't exist.