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Oracle® Database PL/SQL Packages and Types Reference
11g Release 1 (11.1)

Part Number B28419-01
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171 OWA_CACHE

The OWA_CACHE package provides an interface that enables the PL/SQL Gateway cache to improve the performance of PL/SQL web applications.

See Also:

For more information about implementation of this package:

The chapter contains the following topics:


Using OWA_CACHE


Constants


Summary of OWA_CACHE Subprograms

Table 171-1 OWA_CACHE Package Subprograms

Subprogram Description
DISABLE Procedure
Disables the cache for this particular request
GET_ETAG Function
Returns the tag associated with the cached content (used in the Validation technique model only)
GET_LEVEL Function
Returns the caching level (used in the Validation technique model only)
SET_CACHE Procedure
Sets up the cache headers for validation model cache type
SET_EXPIRES Procedure
Sets up the cache headers for expires model cache type
SET_NOT_MODIFIED Procedure
Sets up the headers for a not modified cache hit (used in the Validation technique model only)
SET_SURROGATE_CONTROL Procedure
Sets up the headers for a surrogate-control header for web cache


DISABLE Procedure

This procedure disables the cache for this particular request.

Syntax

OWA_CACHE.DISABLE;

GET_ETAG Function

This function returns the tag associated with the cached content. It is used in the Validation technique only.

Syntax

OWA_CACHE.GET_ETAG
  RETURN VARCHAR2;

Return Values

The tag for cache hit, otherwise NULL.


GET_LEVEL Function

This returns the caching level. It is used in the Validation technique model only.

Syntax

OWA_CACHE.GET_LEVEL
  RETURN VARCHAR2;

Return Values

The caching level string ('USER' or 'SYSTEM') for cache hit, otherwise NULL.


SET_CACHE Procedure

This sets up the cache headers for validation model cache type.

Syntax

OWA_CACHE.SET_CACHE(
   p_etag        IN       VARCHAR2,
   p_level       IN       VARCHAR2);

Parameters

Table 171-2 SET_CACHE Procedure Parameters

Parameter Description
p_etag The etag associated with this content
p_level The caching level ('USER' or 'SYSTEM').

Exceptions

VALUE_ERROR is thrown if


SET_EXPIRES Procedure

This procedure sets up the cache headers for expires model cache type.

Syntax

OWA_CACHE.SET_EXPIRES(
   p_expires      IN       NUMBER,
   p_level        IN       VARCHAR2);

Parameters

Table 171-3 SET_EXPIRES Procedure Parameters

Parameter Description
p_expires The number of minutes this content is valid.
p_level The caching level ('USER' or 'SYSTEM').

Exceptions

VALUE_ERROR is thrown if


SET_NOT_MODIFIED Procedure

This procedure sets up the headers for a not-modified cache hit. It is used in the Validation technique only.

Syntax

OWA_CACHE.SET_NOT_MODIFIED;

Exceptions

VALUE_ERROR is thrown if If the etag was not passed in


SET_SURROGATE_CONTROL Procedure

This procedure sets the headers for a surrogate-control header for web cache

Syntax

OWA_CACHE.SET_SURROGATE_CONTROL(
   p_value        IN       VARCHAR2);

Parameters

Table 171-4 SET_SURROGATE_CONTROL Procedure Parameters

Parameter Description
p_value The value to be passed as the Surrogate-Control header.

Exceptions

VALUE_ERROR is thrown if If p_value is greater than 55 in length.