Update db.UpdateableNav (OneToMany)

Src/Asp.Net/SqlSugar/Abstract/ExecuteNavProvider/UpdateNavOneToMany.cs

@@ -68,22 +68,69 @@ namespace SqlSugar
             var oneToManys = thisEntity.Columns.Where(it => it.Navigat != null && it.Navigat.NavigatType == NavigateType.OneToMany).ToList();
             foreach (var oneToMany in oneToManys)
             {
-                var fkFieldName = oneToMany.Navigat.Name2?? thisEntity.Columns.FirstOrDefault(it=>it.IsPrimarykey).PropertyName;
+                var fkFieldName = oneToMany.Navigat.Name2 ?? thisEntity.Columns.FirstOrDefault(it => it.IsPrimarykey).PropertyName;
                 var fkDbColumnName = thisEntity.Columns.FirstOrDefault(it => it.PropertyName == fkFieldName).DbColumnName;
-                var fks= this._Context.Queryable<object>()
+                var fks = this._Context.Queryable<object>()
                 .AS(thisEntity.DbTableName)
-                .In(fkName, ids.Distinct().ToList()).Select(fkDbColumnName).ToDataTable().Rows.Cast<System.Data.DataRow>().Select(x=>x[0]).ToArray();
+                .In(fkName, ids.Distinct().ToList()).Select(fkDbColumnName).ToDataTable().Rows.Cast<System.Data.DataRow>().Select(x => x[0]).ToArray();
 
                 var type = oneToMany.PropertyInfo.PropertyType.GenericTypeArguments[0];
                 var entity = this._Context.EntityMaintenance.GetEntityInfo(type);
                 var id = oneToMany.Navigat.Name;
                 var column = entity.Columns.FirstOrDefault(it => it.PropertyName == id).DbColumnName;
+
+                DeleteChild(fks, entity, column);
+
                 this._Context.Deleteable<object>()
                                                 .AS(entity.DbTableName)
                                                 .In(column, fks.Distinct().ToList()).ExecuteCommand();
             }
         }
 
+        private void DeleteChild(object[] fks, EntityInfo entity, string column)
+        {
+            var childs = entity.Columns.Where(it => it.Navigat != null && it.Navigat?.NavigatType == NavigateType.OneToMany).ToList();
+            if (childs.Any())
+            {
+                var pkColumn = entity.Columns.First(it => it.IsPrimarykey);
+                var pkIds = this._Context.Queryable<object>()
+                                         .AS(entity.DbTableName)
+                                         .In(column, fks.Distinct().ToList())
+                                         .Select(pkColumn.DbColumnName).ToDataTable().Rows
+                                         .Cast<System.Data.DataRow>().Select(it => it[0]).ToList();
+                DeleteChildChild(pkIds, childs);
+            }
+        }
+
+        int childIndex = 0;
+        private void DeleteChildChild(List<object> ids, List<EntityColumnInfo> childs)
+        {
+            childIndex++;
+            if (childIndex > 4)
+            {
+                Check.ExceptionEasy("Removing too many levels", "安全机制限制删除脏数据层级不能超过7层");
+            }
+            foreach (var columnInfo in childs)
+            {
+                var navigat = columnInfo.Navigat;
+                var type = columnInfo.PropertyInfo.PropertyType.GenericTypeArguments[0];
+                var thisEntity = this._Context.EntityMaintenance.GetEntityInfo(type);
+                var fkColumn = thisEntity.Columns.FirstOrDefault(it => navigat.Name.EqualCase(it.PropertyName));
+                var thisPkColumn = thisEntity.Columns.FirstOrDefault(it => it.IsPrimarykey);
+                var childs2 = thisEntity.Columns.Where(it => it.Navigat != null && it.Navigat?.NavigatType == NavigateType.OneToMany).ToList(); ;
+                if (childs2.Any())
+                {
+                    var pkIds = _Context.Queryable<object>().AS(thisEntity.DbTableName)
+                                         .In(fkColumn.DbColumnName, ids)
+                                         .Select(thisPkColumn.DbColumnName).ToDataTable().Rows
+                                        .Cast<System.Data.DataRow>().Select(it => it[0]).ToList();
+
+                    DeleteChildChild(pkIds, childs2);
+                }
+                _Context.Deleteable<object>().AS(thisEntity.DbTableName).In(fkColumn.DbColumnName, ids).ExecuteCommand();
+            }
+        }
+
         private EntityColumnInfo GetParentPkColumn()
         {
             EntityColumnInfo parentPkColumn = _ParentPkColumn;