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java.lang.Objectorg.eclipse.persistence.config.CacheUsage
public class CacheUsage
Cache usage hint values. Cache usage allows the cache to be used on queries to avoid accessing the database. By default for JPA queries the cache is not checked before accessing the database, but is used after accessing the database to avoid re-building the objects and avoid accessing the database for relationships. Cache usage can also be used for modify Update-All and Delete-All queries. For modify-all queries it effects how the cache is updated, either NoCache or Invalidate. By default modify-all queries invalidate the cache. The class contains all the valid values for QueryHints.CACHE_USAGE query hint.
JPA Query Hint Usage:
query.setHint(QueryHints.CACHE_USAGE, CacheUsage.CheckCacheOnly);
or
@QueryHint(name=QueryHints.CACHE_USAGE, value=CacheUsage.CheckCacheOnly)
Hint values are case-insensitive. "" could be used instead of default value CacheUsage.DEFAULT.
QueryHints
Field Summary | |
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static java.lang.String |
CheckCacheByExactPrimaryKey
Configure the cache to be checked first if the query is by primary key (only). |
static java.lang.String |
CheckCacheByPrimaryKey
Configure the cache to be checked first if the query contains the primary key. |
static java.lang.String |
CheckCacheOnly
Configure the cache to be searched for any matching objects. |
static java.lang.String |
CheckCacheThenDatabase
Configure the cache to be searched for any matching object before accesing the database. |
static java.lang.String |
ConformResultsInUnitOfWork
Configure the query results to be conformed with the current persistence context. |
static java.lang.String |
DEFAULT
|
static java.lang.String |
DoNotCheckCache
Do not check the cache first, this is the default for JPA Queries. |
static java.lang.String |
Invalidate
Configures a modify-all query to invalidate the cache. |
static java.lang.String |
NoCache
Configures a modify-all query to not invalidate the cache. |
static java.lang.String |
UseEntityDefault
By default the descriptor default is used, which is to not check the cache first. |
Constructor Summary | |
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CacheUsage()
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Method Summary |
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Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Field Detail |
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public static final java.lang.String UseEntityDefault
public static final java.lang.String DoNotCheckCache
public static final java.lang.String CheckCacheByExactPrimaryKey
public static final java.lang.String CheckCacheByPrimaryKey
public static final java.lang.String CheckCacheThenDatabase
public static final java.lang.String CheckCacheOnly
public static final java.lang.String ConformResultsInUnitOfWork
public static final java.lang.String NoCache
public static final java.lang.String Invalidate
public static final java.lang.String DEFAULT
Constructor Detail |
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public CacheUsage()
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EclipseLink 1.1.1_ 1.1.1.v20090430-r4097 API Reference | |||||||||
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