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.
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。 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。
