Delphi:这个实例主要是演示Delphi中的OnStateChange事件的用法，编译运行前请先配置好数据库信息，使用OnStateChange事件从数据库中读取客户信息，并实现内容添加、打英和删除等操作。

-Delphi: This example demonstrates the use of Delphi mainly in OnStateChange event, please pre-configured to compile and run the database information, use OnStateChange event read from the database of customer information, and implement content to add, and delete operations to fight the British.