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答應查詢表達式直接傳遞到底層的數據驅動，這樣一個程序可以獲得盡量多的SQL功能，但是可能被DBMS拒絕。事實上，一個程序的查詢甚至可以不是SQL的，或者是SQL的一個非凡演化，例如：為專門數據庫設計的文本或者圖形查詢。 為了通過JDBC兼容的測試，并且能夠被稱為JDBC兼容，我們要求一個驅動至少支持ANSI SQL-2的標準。這使得那些需要廣泛移植性的程序獲得一個最小的分母(這句話的原文是： This gives applications that want wide portability a guaranteed least common denominator.)。 我們相信ANSI SQL-2是足夠強大的，并且是得到足夠支持的。
