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Java Persistence API (JPA) Extensions Reference for EclipseLink, Release 2.4
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query-results-cache.type

Use eclipselink.query-results-cache.type to set the cache type used for the query's results cache.


Values

Table 4-33 describes this query hint's values.

Table 4-33 Valid Values for query-results-cache.type

Value Description

Cache

(Default) Fixed size LRU cache (CacheIdentityMap)

Full

Provides full caching and guaranteed identity.

Hard_Weak

Similar to SOFT_WEAK, except that it uses hard references in the sub-cache.

None

No caching.

Soft

Similar to FULL, except the map holds the objects using soft references.

Soft_Weak

Similar to WEAK, except it maintains a most-frequently-used sub-cache.

Weak

Similar to FULL, except the map holds the objects using weak references.



Usage


Examples

Example 4-67 shows how to use this hint in a JPA query.

Example 4-67 Using query-results-cache.type in a JPA Query

import org.eclipse.persistence.config.HintValues;
 import org.eclipse.persistence.config.QueryHints;
 query.setHint("eclipselink.QUERY_RESULTS_CACHE_TYPE", "FULL");

Example 4-68 shows how to use this hint with the @QueryHint annotation.

Example 4-68 Using query-results-cache.type in a @QueryHint Annotation

import org.eclipse.persistence.config.HintValues;
 import org.eclipse.persistence.config.QueryHints;
 @QueryHint(name=QueryHints.QUERY_RESULTS_CACHE_TYPE, value="FULL");


See Also

For more information, see:

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