修改计算列

2022-04-21 15:01:53 +08:00
parent fca6be727c
commit 6d5f73a415
4 changed files with 50 additions and 15 deletions
@@ -0,0 +1,31 @@
+using System;
+using IRaCIS.Core.Domain.Models;
+using Microsoft.EntityFrameworkCore.ChangeTracking;
+using Microsoft.EntityFrameworkCore.ValueGeneration;
+
+namespace IRaCIS.Core.Infra.EFCore.ValueGenerator
+{
+    public class UploadTotalMillisecondsInterval : ValueGenerator<int>
+    {
+
+        //code first  must  migration    dbfirst  must config  in db and also need config in code
+        //modelBuilder.Entity<StudyMonitor>().Property(e => e.TotalMillisecondsInterval).HasComputedColumnSql("datediff(MS,UploadStartTime,UploadFinishedTime)");
+
+        //modelBuilder.Entity<StudyMonitor>().Property(e => e.TestInterval).ValueGeneratedOnAddOrUpdate().HasDefaultValueSql("datediff(MS,UploadStartTime,UploadFinishedTime)");
+
+
+        public override int Next(EntityEntry entry)
+        {
+            if (entry.Entity is StudyMonitor entity)
+            {
+                return (entity.UploadFinishedTime - entity.UploadStartTime).Milliseconds;
+            }
+            else
+            {
+                throw new ArgumentException("ValueGenerator用在了不适合的实体");
+
+            }
+        }
+        public override bool GeneratesTemporaryValues => false;
+    }
+}