java.sql package, referred to as the JDBC core API, and the javax.sql package, referred to as the JDBC Optional Package API. This complete JDBC API is included in the Java™ Standard Edition (Java SE™), version 7. The javax.sql package extends the functionality of the JDBC API from a client-side API to a server-side API, and it is an essential part of the Java™ Enterprise Edition (Java EE™) technology.