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1. 发明授权

US08037040B2 Generating continuous query notifications 有权
标题翻译：生成连续的查询通知
公开(公告)号：US08037040B2
公开(公告)日：2011-10-11
申请号：US12189078
申请日：2008-08-08
申请人： Srinivas S. Vemuri , Bipul Sinha , Amit Ganesh , Subramanyam B. Chitti
发明人： Srinivas S. Vemuri , Bipul Sinha , Amit Ganesh , Subramanyam B. Chitti
IPC分类号： G06F17/30
CPC分类号： G06F17/30516
摘要： Techniques are described to allow a query to be registered as a persistent stored entity within the database, and to generate notifications as and when the query result changes continuously as long as the query continues to be registered with the database. According to one aspect, for a table referenced in a query, a filter condition is generated based, at least in part, on a predicate of the query. Then, the database server determines whether the filter condition is satisfied by either a before image of a row, or an after image of the row, that was modified by a transaction. If the filter condition is satisfied by either the before image or the after image, then the query is added to a first set of queries whose result sets may have been affected by the transaction. From among the first set of queries, a second set of queries that have result sets that were actually affected by the transaction is determined. Notifications are then sent based on the second set of queries.
摘要翻译：描述技术来允许将查询注册为数据库内的持久存储实体，并且只要查询继续向数据库注册，就可以随着查询结果不断更改而生成通知。根据一个方面，对于在查询中引用的表，基于至少部分地基于查询的谓词生成过滤条件。然后，数据库服务器通过由事务修改的行的先前图像或行的后续图像来确定滤波器条件是否满足。如果过滤条件由前图像或后图像所满足，则将查询添加到其结果集可能受事务影响的第一组查询中。从第一组查询中，确定具有实际受事务影响的结果集的第二组查询。然后基于第二组查询发送通知。

2. 发明申请

US20100036831A1 GENERATING CONTINUOUS QUERY NOTIFICATIONS 有权
标题翻译：生成连续查询通知
公开(公告)号：US20100036831A1
公开(公告)日：2010-02-11
申请号：US12189078
申请日：2008-08-08
申请人： Srinivas S. Vemuri , Bipul Sinha , Amit Ganesh , Subramanyam B. Chitti
发明人： Srinivas S. Vemuri , Bipul Sinha , Amit Ganesh , Subramanyam B. Chitti
IPC分类号： G06F17/30
CPC分类号： G06F17/30516
摘要： Techniques are described to allow a query to be registered as a persistent stored entity within the database, and to generate notifications as and when the query result changes continuously as long as the query continues to be registered with the database. According to one aspect, for a table referenced in a query, a filter condition is generated based, at least in part, on a predicate of the query. Then, the database server determines whether the filter condition is satisfied by either a before image of a row, or an after image of the row, that was modified by a transaction. If the filter condition is satisfied by either the before image or the after image, then the query is added to a first set of queries whose result sets may have been affected by the transaction. From among the first set of queries, a second set of queries that have result sets that were actually affected by the transaction is determined. Notifications are then sent based on the second set of queries.
摘要翻译：描述技术来允许将查询注册为数据库内的持久存储实体，并且只要查询继续向数据库注册，就可以随着查询结果不断更改而生成通知。根据一个方面，对于在查询中引用的表，基于至少部分地基于查询的谓词生成过滤条件。然后，数据库服务器通过由事务修改的行的先前图像或行的后续图像来确定滤波器条件是否满足。如果过滤条件由前图像或后图像所满足，则将查询添加到其结果集可能受事务影响的第一组查询中。从第一组查询中，确定具有实际受事务影响的结果集的第二组查询。然后基于第二组查询发送通知。

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