SQL Server 2005's Type 4 JDBC driver provides database connectivity from a Java application. Though the driver class and connection URL are a bit different in this version, connectivity is a snap.

Connect your Java applications to databases—the easy way To access a database management system (DBMS) in Java, you need a JDBC (Java Database Connectivity) driver.

之后改为java -cp ojdbc6.jar JDBC_Connection运行成功。 那么问题来了，我的classpath环境变量里已经包含了当前路径，理论上来讲不加-cp也会检索当前路径下的jar包，我加了-cp不过是全路径到该jar包。 不明白这是为什么? 新手望不吝指教，谢谢！

These functions make use of the Java Database Connectivity (JDBC) drivers provided by Oracle to open connection with the database and interact with it.

JPA-based applications can't connect to a database on their own. Rather, they need help in terms of what credentials to use, which schema to seek, which JDBC driver to select and which annotated ...