Package org.apache.cayenne.query

Defines standard queries supported by Cayenne and extension mechanism to create custom queries.

See: Description

Interface Summary

Interface	Description
EntityResultSegment	A "compiled" version of a EntityResult descriptor.
ParameterizedQuery	Defines a query that can serve as a template for other queries.
PrefetchProcessor	A hierarchical visitor interface for traversing a tree of PrefetchTreeNodes.
Query	Defines minimal API of a query descriptor that is executable via Cayenne.
QueryMetadata	Provides a common interface for accessing query metadata.
QueryRouter	An interface used by Queries to route themselves to an appropriate QueryEngine.
ScalarResultSegment
Select<T>	A common interface for grouping together different kinds of queries that return results.
SQLAction	Defines API for query execution strategy over JDBC connection (as in Strategy Pattern).
SQLActionVisitor	A factory interface to create standard SQLActions for a set of standard queries.

Class Summary

Class	Description
AbstractMappedQuery
AbstractQuery	A common superclass of Cayenne queries.
BatchQuery	BatchQuery and its descendants allow to group similar data for the batch database modifications, including inserts, updates and deletes.
BatchQueryRow	Represents a single row of values in a BatchQuery.
CacheableQuery	Shared functionality for cacheable queries.
ColumnSelect<T>	A helper builder for queries selecting individual properties based on the root object.
DeleteBatchQuery	Batched delete query.
EJBQLQuery	An EJBQL query representation in Cayenne.
FluentSelect<T>	Base class for ObjectSelect and ColumnSelect
IndirectQuery	A base superclass for queries that resolve into some other queries during the routing phase.
InsertBatchQuery	Batched INSERT query.
MappedExec	A query that represents a named parameterized non selecting query stored in the mapping.
MappedSelect<T>	A query that represents a named parameterized selecting query stored in the mapping.
NamedQuery	Deprecated since 4.0 you should use MappedSelect or MappedExec instead.
ObjectIdQuery	A query that matches zero or one object or data row corresponding to the ObjectId.
ObjectSelect<T>	A selecting query providing chainable API.
Ordering	Defines object sorting criteria, used either for in-memory sorting of object lists or as a specification for building ORDER BY clause of a SelectQuery query.
Orderings	Orderings is provided so that you can chain Ordering together and then use the result to pass into methods that require List<Ordering>
PrefetchSelectQuery	A SelectQuery to perform a prefetch based on another query.
PrefetchTreeNode	Defines a node in a prefetch tree.
ProcedureCall<T>	Fluent API for calling stored procedures.
ProcedureQuery	A query based on Procedure.
QueryChain	A Query decorator for a collection of other queries.
QueryMetadataProxy
RefreshQuery	A query that allows to explicitly clear both object and list caches either via refetch (eager refresh) or invalidate (lazy refresh).
RelationshipQuery	A query that selects objects related to a given object via a mapped relationship.
SelectById<T>	A query to select single objects by id.
SelectQuery<T>	A query that selects persistent objects of a certain type or "raw data" (aka DataRows).
SQLExec	A generic query based on raw SQL and featuring fluent API.
SQLSelect<T>	A selecting query based on raw SQL and featuring fluent API.
SQLTemplate	A query that executes unchanged (except for template preprocessing) "raw" SQL specified by the user.
UpdateBatchQuery	Batched UPDATE query.

Enum Summary

Enum	Description
CapsStrategy	Defines forced capitalization of the result column names in the DataRow.
QueryCacheStrategy	Defines query result caching policy.
SortOrder	Constants to order query results (the ORDER BY clause).

Package org.apache.cayenne.query Description

Defines standard queries supported by Cayenne and extension mechanism to create custom queries. Many of the queries in this package are used by the framework internally. Normally users would only care about these general query classes:

• SelectQuery
• SQLTemplate
• ProcedureQuery

and sometimes - these specialized queries:

• QueryChain
• RelationshipQuery
• SingleObjectQuery

Cayenne can "execute" any object as a query as long as it implements Query interface and provides meaningful implementation of either Query.route(...) and/or Query.createSQLAction(SQLActionVisitor)} methods. So users can extend/customize queries if they need to. Custom implementations would normally either create a query from a standard Cayenne set and delegate the execution to it (acting as a sort of "query builder"), or can implement its own non-standard SQLAction.