From this simple visual design you can easily map the business logic straight into database tables.

从这个简单的可视设计中，可以容易地把业务逻辑直接映射到数据库表。

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The logic behind this design decision is that indexes add value only when the DBA can predict which queries will be run against the database.

该设计决策背后的逻辑是索引只在DBA可以预测到将要对数据库运行什么查询时才有价值。

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You can create database design, database access, and the PHP business logic code that sits on top of it in any number of ways, and you often end up getting it wrong.

您可以用很多的方式创建数据库设计、数据库访问和基于数据库的PHP业务逻辑代码，但最终一般以错误告终。

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