摘要:
The claimed subject matter provides systems and methods that effectuates and facilitates the generation of bidirectional views. The disclosed system can include components that transform queries and mappings into an internal representation that can be compiled into a bidirectional view. The bidirectional view can thereafter be employed to actuate query and update processing in a relational database management system.
摘要:
There is alteration of a late-bound expression produced by a compiler into an early-bound structure. Alteration of the late-bound expression can occur at runtime and a visitor pattern can be used to create the alteration. In one instance, a conversion from late-bound to early-bound takes place through replacing a late-bound property with a statically typed call. The early-bound structure can translate into an expression tree to enable an implementation of a store specific query operated upon storage.
摘要:
There is alteration of a late-bound expression produced by a compiler into an early-bound structure. Alteration of the late-bound expression can occur at runtime and a visitor pattern can be used to create the alteration. In one instance, a conversion from late-bound to early-bound takes place through replacing a late-bound property with a statically typed call. The early-bound structure can translate into an expression tree to enable an implementation of a store specific query operated upon storage.
摘要:
A database update pipeline may be incorporated into a data access architecture for providing data services to applications, thereby bridging the gap between application data and data as persisted in databases. The update pipeline has the ability to translate changes made to object instances into data store change constructs, and carry those changes over to a data store. Such a pipeline can also advantageously perform the reverse operation, allowing applications to query using the database update pipeline, and receive materialized object instances.
摘要:
A database update pipeline may be incorporated into a data access architecture for providing data services to applications, thereby bridging the gap between application data and data as persisted in databases. The update pipeline has the ability to translate changes made to object instances into data store change constructs, and carry those changes over to a data store. Such a pipeline can also advantageously perform the reverse operation, allowing applications to query using the database update pipeline, and receive materialized object instances.
摘要:
Lightweight query processing for in-memory or cache memory data structures, such as DataSet, is provided. Prior to executing a query over an in-memory data structure, a query processor determines whether any benefits can be obtained by first optimizing the query execution strategy. Additionally, one or more bail out points can be applied to the optimization analysis to further enhance query execution speed for circumstances where optimization is unlikely to provide significant performance benefits. The lightweight query processing techniques can be supported in any framework for processing or formulating queries of in-memory data structures, such as language integrated query (LINQ) queries.
摘要:
Aspects of the subject matter described herein relate to stream operators. In aspects, a stream event is received. Based on a timestamp associated with the stream event and the number of stream operators that have asked to be activated prior to or at the timestamp, zero or more stream objects are informed of one or more time events and torn down if no longer needed. In addition, a destination stream operator is instantiated, if needed, data (e.g., the timestamp and packet, if any) corresponding to the stream event is provided to a stream operator, output data, if any, is received from the stream operator, and the stream operator is torn down if it no longer needs state data between invocations.
摘要:
A result shaping methodology is part of a bridge (translation layer) between an entity provider and an underlying store provider. The bridge accepts command trees and parameter values from a consumer (e.g., the entity provider), reshapes the trees as necessary for its underlying store provider to execute, executes resulting commands, and assembles the results from the commands into the nested data reader that the initial command tree requested. The result assembly advantageously takes a mapping declaration and compiles it into a set of expression definitions composed from a small number of simple functions. Each collection in the result has a corresponding expression describing how collection elements are realized given relational results. Other expressions describe boundary detection behavior. These expressions are compiled into functions used to shape relational data into arbitrary object graphs or streaming interfaces. Alternative versions of the expressions for performance or graceful contextual error handling are also compiled.
摘要:
An outer event stream can be modeled to represent duration for an event with an inner event stream. The inner event stream can be generated to represent duration of at least one event from the outer event stream. By modeling the outer event stream to include duration, coincidence between two or more events can be determined. More specifically, the modeling of the outer event stream enables use of operators to identify coincidence between events from event streams.
摘要:
Aspects of the subject matter described herein relate to mapping from application objects to an abstract data model. In aspects, a mapper receives registrations that indicate behavior (e.g., how objects are constructed, modified, or examined) of application objects. The behavior may be specified using user-supplied expressions. The mapper aggregates this data and uses it to map application requests for data access into one or more operations that operate on the abstract data model. A data access layer may then translate the operations into actions to access data corresponding to the requests from a store. If appropriate, data obtained from the store may then be inserted into application objects as indicated by the registrations.