maintain-cache

Use eclipselink.maintain-cache to controls whether or not query results are cached in the session cache

Values

Table 4-24 describes this query hint's valid values.

Usage

The eclipselink.maintain-cache hint provides a way to query the current database contents without affecting the current persistence context. It configures the query to return un-managed instances so any updates to entities queried using this hint would have to be merged into the persistence context.

Examples

Example 4-48 shows how to use this hint in a JPA query.

import org.eclipse.persistence.config.HintValues;
 import org.eclipse.persistence.config.QueryHints;
 query.setHint(QueryHints.MAINTAIN_CACHE, HintValues.FALSE);

Example 4-49 shows how to use this hint with the @QueryHint annotation.

import org.eclipse.persistence.config.HintValues;
 import org.eclipse.persistence.config.QueryHints;
 @QueryHint(name=QueryHints.MAINTAIN_CACHE, value=HintValues.FALSE);

See Also

For more information, see:

• "Scaling EclipseLink Applications in Clusters" in Solutions Guide for EclispeLink

• "Enhancing Performance" in Solutions Guide for EclispeLink

• "EclipseLink Caches" in Understanding EclipseLink