使用MyBatis之前，我们要知道，什么是MyBatis？
MyBatis是apache一个开源的，基于Java的持久层框架。
MyBatis的优点有哪些？
学习简单，提供半自动的关系映射，SQL语句与代码分离。
MyBatis的缺点又有哪些？
要会写SQL语句；每个数据库的SQL语句都多少会有偏差，所以不方便更换数据库。
MyBatis适合什么样的项目？
适合性能要求很高，或者需要变化较多的项目。
要使用MyBatis，得有MyBatis的jar包。
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