two-tier bridge 中文意思是什麼
two-tier bridge
解釋
雙層橋樓-
Two - tier bridge
雙層橋樓 -
Furthermore, the existing algorithms for dynamic query are generally dependent on the static mapping algorithms. to resolve these two problems, a gvrs ( general virtual relational schema ) model for xml document is put forward as a bridge between xml instance document and factual rdb, and an algorithm which transformes xquery into sql and is independent on the static schema mapping, is realized. based on the above approaches, the dynamic data query on bottom rdb is carried out through xml view and the data integration between rdb and xml is achieved on the dynamic query tier
通過xml視圖動態檢索底層rdb的技術建立基於rdb的xml動態檢索機制；針對現有動態檢索演算法大多依賴靜態模式映射演算法的問題以及基於w3c工作草案xquery的研究尚無實質性進展的現狀，通過提出並建立gvrs （ generalvirtualrelationalschemaforxmldocument ）模型，作為xml事例文件與rdb之間的橋梁，實現了一種與靜態模式映射「無關」的xquery到sql的轉換演算法，保證動態檢索對各種靜態轉換的普遍適應性，實現了通過xml視圖對底層rdb的動態數據檢索，較好地解決了xml與rdb在動態檢索層面的數據集成問題，可有效滿足根據用戶需要有選擇動態檢索系統底層rdb數據的需求。
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