发明授权
US07991796B2 System and program for implementing scrollable cursors in a distributed database system
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在分布式数据库系统中实现可滚动光标的系统和程序
- 专利标题: System and program for implementing scrollable cursors in a distributed database system
- 专利标题(中): 在分布式数据库系统中实现可滚动光标的系统和程序
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申请号: US12348818申请日: 2009-01-05
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公开(公告)号: US07991796B2公开(公告)日: 2011-08-02
- 发明人: Curt Lee Cotner , Margaret A. Dong
- 申请人: Curt Lee Cotner , Margaret A. Dong
- 申请人地址: US NY Armonk
- 专利权人: International Business Machines Corporation
- 当前专利权人: International Business Machines Corporation
- 当前专利权人地址: US NY Armonk
- 代理机构: Konrad Raynes & Victor LLP
- 代理商 Rabindranath Dutta
- 主分类号: G06F17/30
- IPC分类号: G06F17/30
摘要:
Provided are a system and program for accessing data in a distributed database environment. A client program receives multiple requests for data from a database object satisfying specified search predicates from an application program. Each request includes a request for at least one row from the table. The client program transfers a database command and a rowset parameter indicating a maximum number of rows to return to a server program over a network if the requested row is not maintained by the client program. A data block is generated with the server program including rows from the database object satisfying the search predicates in response to the database command. The rows included in the data block do not exceed the rowset parameter. The server program transfers the data block to the client program. In turn, the client program returns at least one requested row from the received data block in response to one request for the at least one row of data from the application program.
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