1.通过鼠标拖拽和弹出对话框完成实体、属性、联系的绘制以及各参数设定 2.对绘制的实体、属性、联系提供合法性检查 3.对绘制的图形进行拖动、重设大小、删...

代码说明：

1.通过鼠标拖拽和弹出对话框完成实体、属性、联系的绘制以及各参数设定 2.对绘制的实体、属性、联系提供合法性检查 3.对绘制的图形进行拖动、重设大小、删除 4.通过属性对话框对实体、属性、联系的各种参数进行重新设置 5.数据的串行化 6.将绘制完成的E-R图转换成数据库脚本-1. Through mouse drag and drop and pop-up dialog box to complete entities, attributes, links, as well as drawing parameter setting 2. Drawing entities, attributes, links provided to check the legality of 3. The graphics on the drawing drag, reset size, delete 4. through the Properties dialog box on the entities, attributes, linked to various parameters re-set 5. serialization of data 6. will be drawn to complete the ER diagram into a database script