该实现包含封装所有用于数据访问和操纵的sql语句的方法。
The implementation contains methods encapsulating all required SQL statements for data access and manipulation.
对于通过对象化来编程式地访问和操纵关系数据，最流行的方式是通过一些 API 和包装器，这些 API 和包装器提供了一个或多个编写为文本字符串的 SQL 语句。
The most popular way to objectize to programmatically access and manipulate relational data has been through special APIs and wrappers that provide one or more SQL statements written as text strings.
当对数据库中的大量数据进行操纵时，最好运行该语句。
Ideally, it is preferred to run this statement when a bulk of data is manipulated in the database.
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