For a Web application, the data source is commonly a relational database, which has some forms of search built in. (Equality is a simple search operator, as is the SQL operator LIKE.)
对于Web应用程序，数据源通常是一个关系数据库，其中内置了一些搜索功能(Equality是一个简单的搜索运算符，与SQL运算符like一样)。
In this paper, a relational database based on nested relation is proposed it supports text storage and text operator. The text query is supported by signature file indexing technology.
本文提出的一个嵌套关系模型支持文本存储和文本检索操作，其中特征文件索引为文本检索提供了技术支持。
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