objective-c的数据库封装方法，实体类直接映射到数据库，对数据库的操作极其简单实用，对数据库的CRUD操作无需写任何SQL语句，项目框架已打包，请到附件中下载使用。
objective-c的数据库封装方法，实体类直接映射到数据库，对数据库的操作极其简单实用，对数据库的CRUD操作无需写任何SQL语句，项目框架已打包，请到附件中下载使用。
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