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数据库创建命令if exists (select 1 from sys.sysreferences r join sys.sysobjects o on (o.id = r.constid and o.type = 'F') where r.fkeyid = object_id('Adress') and o.name = 'FK_ADRESS_REFERENCE_USERS')

未优化修改：static void Main(string[] args) { DateTime startDateTime = DateTime.Now; using (studyEntities study = new studyEntities()) { //study