In fact, an application query need not even be SQL, or it may be a specialized derivative of SQL, e.g. for document or image queries, designed for specific DBMSs. In order to pass JDBC compliance tests and to be called "JDBC COMPLIANT ?" we require that a driver support at least ANSI SQL-2 Entry Level. This gives applications that want wide portability a guaranteed least common denominator. We believe ANSI SQL-2 Entry Level is reasonably powerful and is reasonably widely supported today.
l JDBC答应查询表达式直接传递到底层的数据驱动，这样一个程序可以获得尽量 多的SQL功能，但是可 能被DBMS拒绝。事实上，一个程序的查询甚至可以不是SQL的，或者是SQL的一个 非凡演化，例如： 为专门数据库设计的文本或者图形查询。 l 为了通过JDBC兼容的测试，并且能够被称为JDBC兼容，我们要求一个驱动至少 支持ANSI SQL-2的标 准。这使得那些需要广泛移植性的程序获得一个最小的分母(这句话的原文是： This gives applications that want wide portability a guaranteed least common denominator.)。 我们相信ANSI SQL-2是足够强大的，并且是得到足够支持的。
2.3. JDBC必须可以建立在现有的数据库接口上
我们必须能够保证 JDBC SQL API 能够建立在普通的SQL API上，尤其是ODBC。这 些要求已经对这个 规范的一些部分产生了影响，尤其是对传出参数(OUT parameter)和大数据块的处 理。
We would PRefer to keep this base API as simple as possible, at least initially. In general we would prefer to provide a single mechanism for performing a particular task, and avoid provid-ing duplicate mechanisms. We will extend the API later if any important functionality is miss-ing.
Before looking at specifics of the JDBC API, an understanding of typical use scenarios is help-ful. There are two common scenarios that must be treated differently for our purposes: applets and applications.
