[DatabaseGenerated(DatabaseGeneratedOption.Identity)]
添加时 获取值 自增 默认值,,后期无法修改如:Id(AUTO_INCREMENT,自增) , AddDatetime (CURRENT_TIMESTAMP|getdate())
[DatabaseGenerated(DatabaseGeneratedOption.Computed)]
更新时 获取值 修改即自动生成值 如firstname lastname-->fullname , UpdateDatetime(CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP)
[DatabaseGenerated(DatabaseGeneratedOption.None)] 没有生成值
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