Atg rql not null

Item caches hold the values of repository items, indexed by repository IDs. An item cache entry is invalidated when that item is updated. Query Caches. Query caches hold the repository IDs of items that match given queries. When a query returns repository items whose item descriptor enables query caching, the result set is cached as follows:. A query cache entry can be invalidated for two reasons:.

If query caching is enabled, the first time this query is issued, the result set is retrieved from the database and stored in the query cache. Then, the next time this same query is issued, the SQL repository can retrieve the result set from the cache, rather than needing to access the database. Cache Modes. The SQL repository implements several different modes of caching.

Which mode is to be chosen depends on the nature of your Dynamo application. We can set the default caching mode on each item descriptor in a repository. The caching modes implemented in the SQL repository are:. This ensures a consistent view of item data while the transaction is in progress. Thus, multiple calls to getPropertyValue for the same property within the same transaction require only one database query.

Cached item properties are reloaded from the datastore for each transaction. You can set a property to inherit the default caching mode by setting its cache-mode attribute to inherit.

This mode is suitable for read-only repositories such as product catalogs, where changes are confined to a staging server, and for architectures where only one server handles a given repository item type. A multi-server application might require locked caching, where only one ATG instance at a time has write access to the cached data of a given item type.

You can use locked caching to prevent multiple servers from trying to update the same item simultaneously. Distributed hybrid caching uses Both. The following requirements apply:.

Real-time access to item changes. Infrequent updates to cached items. Modest number of item caches to monitor. Reliable delivery of invalidation messages. Large number of item caches to monitor. Large number of cached items to monitor across many clients. By default, the SQL repository uses simple caching. Please click on "Continue Shopping" button. The following page directive specifies the DSP tag library location and the dsp prefix to use for its tags:.

There are two ways to deploy a tag library. GSARepository class, which implements the interfaces atg. MutableRepository and atg.

ContentRepository and which extends the class atg. GSARepository class. Repository setup steps. While the SQL repository can represent a variety of data models, it cannot easily represent any arbitrary data model. WordPress Shortcode. Share Email. Top clipped slide.

Kate Semizhon Follow. Engineering Manager. Oracle endeca information discovery architecture. Common mistakes for ATG applications that affect performance. ATG Best Practices. Related Books Free with a 30 day trial from Scribd. Related Audiobooks Free with a 30 day trial from Scribd.

Elizabeth Howell. QueryBuilder defines the available query operations build Query objects 6. QueryOptions let you limit the size of the result set, direct how the result set should be sorted, precache specified properties How to get sysdate in RQL named query?

Another set of queries can be applied to arrays or collections of scalar values—for example, properties of type int[], or Set of Strings. To generate ddl,just start the instance ignore table missing errors. If the filterQuery property of the item descriptor is null, the SQL repository tries to use the rqlFilterString and compile it into the filter query.

If both properties are null, filtering is disabled. Nicole Brown Dec. Ramkumar Tulswani May. Miro Adamy Jul. Buddha Jyothiprasad Feb. Vishnu Bovilla Aug. Total views. You just clipped your first slide!