Abstract:  In computer software development, when the commercial database is used by multiple related products, due to the different database driven, different configuration and different operating grammar of the databases, it  may be different from the database selection to the application layer interface. To solve this problem, a unified commercial database is designed and developed. Different implementation is given for different platform when a uniform access interface is provided. By implementing the management of the business table, not involving the specific business, the use for across various systems is realized. And in order to avoid collapse to affect the access efficiency when a large number of databases are connected, the database connection pool is used to implement for connecting and accessing the database connection repository, and it makes the users can focus on business.

Key words: software development, application layer interface, commercial database, connection pool