为了避免持久化的逻辑分散到应用的各个组件中,将数据访问功能放到一个或多个专注于此项任务的组件中,这样的组件通常称为数据访问对象(DAO)或Repository. 为了避免应用与特定的数据访问策略耦合在一起,编写良好的Repository应该以借口的方式暴漏功能.通过接口来访问Repository可以为这些数据访问接口创建mock实现,提升单元测试的效率. SQLException表示在尝试访问数据库时出现了问题,但这个异常却没有告诉你哪里出错了以及如何进行处理. 可能导致抛出SQLExcepti…

http://blog.jobbole.com/100349/ http://coding-geek.com/how-databases-work/…

资料 网址 官方介绍 https://help.aliyun.com/document_detail/26092.html?spm=5176.2020520104.0.0.2b4b1450yqd1gg 首次连接访问RDS需要配置IP白名单 https://help.aliyun.com/document_detail/43185.html?spm=a2c4g.11186623.2.10.2d2031fcqOxqxu#concept-pdr-k2f-vdb 连接MySQL实例 https://he…

小型文件数据库 (a file database for small apps) SharpFileDB For english version of this article, please click here. 我并不擅长数据库,如有不当之处,请多多指教. 本文参考了(http://www.cnblogs.com/gaochundong/archive/2013/04/24/csharp_file_database.html),在此表示感谢! 目标(Goal) 我决定做一个以支持小型应用(…

SharpFileDB - a file database for small apps 本文中文版在此处. I'm not an expert of database. Please feel free to corect my mistakes. This article (http://www.cnblogs.com/gaochundong/archive/2013/04/24/csharp_file_database.html) helpes a lot. Thank you! 目标(G…

When you use a relational database, you need a way to track and organize your database schema evolutions. Typically there are several situation where you need a more sophisticated way to track your database schema changes: When you work within a team…

This article is from blog of Amazon CTO Werner Vogels. -------------------- Today is a very exciting day as we release Amazon DynamoDB, a fast, highly reliable and cost-effective NoSQL database service designed for internet scale applications. Dynamo…

Database Primary key and Foreign key --Create Referenced Table CREATE TABLE Department ( DeptID int PRIMARY KEY, --define primary key Name varchar (50) NOT NULL, Address varchar(100) NULL ) --Create Referencing Table CREATE TABLE Employee ( EmpID int…

Peter studies the theory of relational databases. Table in the relational database consists of values that are arranged in rows and columns. There are different normal forms that database may adhere to. Normal forms are designed to minimize the redun…

http://sqlite.org/whentouse.html Appropriate Uses For SQLite SQLite is not directly comparable to client/server SQL database engines such as MySQL, Oracle, PostgreSQL, or SQL Server since SQLite is trying to solve a different problem. Client/server S…