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Content with label query in WebSphere eXtreme Scale V6.1 User Guide (See content from all spaces)
Related Labels:
reference, entitymanager, example, tutorial, todo, cxsrelmanage
Query performance tuning
tune the performance of your queries, use the following techniques and tips. Using parameters When a query runs, the query string must be parsed and a plan developed to run the query, both of which can be costly. The ObjectGrid caches query plans by the query ...
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entitymanager
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Query interface
Use the query interface to control entity query execution. Use the EntityManager.createQuery(String) method to create a Query. Each query instance can be used multiple times by using the EntityManager in which it was retrieved. Each query result produces an entity ...
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entitymanager
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Stream query XML configurations
You might be familiar with how to create an application to run stream query using programming APIs. ObjectGrid also supports configured stream queries in the ObjectGrid xml file. The configured stream queries are especially useful in preconfiguring stream queries ...
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Stream query annotations
JDK 5.0 introduced metadata (annotation) support to simplify Java programming model. Stream query supports users to use annotations to configure both streams and views. Since the view results are stored as entity tuples, the view annotation also utilizes ...
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Relationships with entity manager
EntityManager APIs use the existing Map based infrastructure underneath. It converts objects to Entities before storing them in the Map. An entity has a key tuple and a value tuple. A tuple is simply an array of primitive types. With this new EntityManager ...
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entitymanager, cxsrelmanage
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Stream query engine language tutorial
1. Introduction 1.1 Purpose The purpose of this tutorial is to teach the SQL programming model of the stream query engine. The stream query engine used by ObjectGrid is called the Stream Processing Technology (SPT) engine. This section introduces the concepts underlying the SPT engine ...
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tutorial
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Basic ObjectQuery Tutorial Step 3
tutorial demonstrates how to develop a local, inmemory ObjectGrid that stores order information for a online retail store using the ObjectMap APIs. In this step, create an ObjectGrid with two maps, a schema for the maps with a relationship, then insert objects into the cache and later retrieve ...
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Basic ObjectQuery Tutorial Step 4
tutorial demonstrates how to develop a local, inmemory ObjectGrid that stores order information for a online retail store using the ObjectMap APIs. This step shows how to create an ObjectGrid with four maps, a schema for the maps with multiple unidirectional and bidirectional relationships ...
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Configuring an ObjectQuery schema
ObjectQuery relies on schema or shape information to perform semantic checking and to evaluate path expressions. This section describes how to define the schema in XML or programmatically. Defining the schema The ObjectMap schema is defined in the ObjectGrid deployment descriptor XML or programmatically using the normal ...
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ObjectGrid query EXISTS predicate
EXISTS predicate tests for the presence or absence of a condition that specified by a subselect. EXISTS ( subselect ) The result of EXISTS is true if the subselect returns at least one value, otherwise the result is false. To negate an EXISTS predicate, precede the predicate with the NOT logical operator. Example ...
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reference
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