And this is the basis of querying database.
这也为进行数据库查询奠定了基础。
Important functions in this module are connecting to a database, querying the database, and giving out results of the query.
该模块中的重要函数有：连接数据库的函数、查询数据库的函数以及提供查询结果的函数。
The syntax for OQL is similar to that of SQL but it lets you query the object model rather than directly querying the database.
OQL的语法类似于SQL的语法，但它却使您能够查询对象模型，而不是直接查询数据库。
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