我们在 EF 的编程中,有时候会遇到这样一个错误: 但是,按照他的提示 "See 'EntityValidationErrors' property for more details." 去 Exception 中查看,却只能看到 并不能看到具体的是那个属性为什么验证不通过,也许不少人都遇到这种情况. 这里给大家介绍一个Exception类,让我们能够轻松的知道具体的哪一个字段出了什么问题. 那就是 System.Data.Entity.Validation.DbEntityValid
who命令与w命令相似,但要比w命令显示更加详细的信息.[root@rusky opt]# man who WHO(1) User Commands WHO(1) NAME who - show who is logged on SYNOPSIS who [OPTION]... [ FILE | ARG1 ARG2 ] DESCRIPTION Print information about users who are currently logged in. -a, --all same as
SQL查看分区内记录个数,常规方法需要知道分区函数然后再显示,网上看到一个一句话显示的方法 ), ps.name ) as partition_scheme, p.partition_number, ), ds2.name ) as filegroup, ), ) as range_boundary, ) as rows from sys.indexes i join sys.partition_schemes ps on i.data_space_id = ps.data_space_id j
NAME w - Show who is logged on and what they are doing. SYNOPSIS w - [husfV] [user] DESCRIPTION w displays information about the users currently on the machine, and their processes. The header shows, in this order, the current time, how long the syst