SQLite是一种嵌入式数据库，它的数据库就是一个文件。由于SQLite本身是C写的，而且体积很小，所以，经常被集成到各种应用程序中，甚至在iOS和Android的App中都可以集成。
它实现了自给自足的、无服务器的、零配置的、事务性的 SQL 数据库引擎。SQLite 引擎不是一个独立的进程，可以按应用程序需求进行静态或动态连接。SQLite 直接访问其存储文件。
sqlite数据库的优点
1.不需要安装配置和管理，体积很小，相对于一些大型数据库要小得多得多。
2.不需要任何外部依赖。
3.sqlite事务兼容ACID，允许多线程或多个进程访问。
4.可跨平台运行，支持多数标准sql2查询语言运行。
sqlite的局限性
1.只实现了 LEFT OUTER JOIN。
2.不支持 DROP COLUMN、ALTER COLUMN、ADD CONSTRAINT。
3.不支持 FOR EACH STATEMENT 触发器。
4.在 SQLite 中，视图是只读的。您不可以在视图上执行 DELETE、INSERT 或 UPDATE 语句。
5.可以应用的唯一的访问权限是底层操作系统的正常文件访问权限。
sqlite命令
sqlite的命令也包括 CREATE、SELECT、INSERT、UPDATE、DELETE 和 DROP，从这点来看，它与sql是很相似的。http://www.wu0553.com/news/37247.html
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