Unique index or primary key violation Unique index or primary key violation while trying to List List<Item> in hibernate

Unique index or primary key violation while trying to List List<Item> in hibernate

程序执行数据库插入过程中遇到唯一索引冲突问题，基本上都是数据重复插入了的缘故，查找当前需要插入数据与之前插入数据是否重复即可。