1.jdbc技术
jdbc的概念
sun公司为了简化和统一java连接数据库，定义的一套规范（API接口）。
5个api开发步骤
数据库准备
引入驱动jar包
注册驱动
获得连接
创建执行sql语句的对象
执行sql语句,处理结果
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2.单元测试
单元测试的概念
junit是一个java语言的单元测试框架。属于第三方工具，一般情况下需要导入jar包，不过大多数的java开发环境已经集成junit作为单元测试工具
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