Add project files.

StockDAL/PersonRepository.cs

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+using DataDomain;
+using DatamodelLibrary;
+using StockDAL.Interface;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace StockDAL
+{
+    public class PersonRepository : IPersonRepository
+    {
+        public Person GetPersonById(int personId)
+        {
+            using var context = new StockContext();
+            var entity = (from prs in context.Persons
+                          where prs.Id == personId
+                          select prs).FirstOrDefault();
+            return entity;
+        }
+
+        public IEnumerable<Person> GetAllOwners()
+        {
+            using var context = new StockContext();
+            var output = context.Persons;
+            return output.ToList();
+        }
+
+
+        public Person SavePerson(Person person)
+        {
+            using var context = new StockContext();
+
+            var entity = (from prs in context.Persons
+                          where prs.Id == person.Id
+                          select prs).FirstOrDefault();
+
+            if (entity == null)
+            {
+                entity = new Person
+                {
+                    AccountNo = person.AccountNo,
+                    Born = person.Born,
+                    ClearingNo = person.ClearingNo,
+                    Comments = person.Comments,
+                    FirstName = person.FirstName,
+                    HomeAddress = person.HomeAddress,
+                    InvoiceAddress = person.InvoiceAddress,
+                    LastName = person.LastName,
+                    NickName = person.NickName
+                };
+                context.Persons.Add(entity);
+            }
+            else
+            {
+                entity.AccountNo = person.AccountNo;
+                entity.Born = person.Born;
+                entity.ClearingNo = person.ClearingNo;
+                entity.Comments = person.Comments;
+                entity.FirstName = person.FirstName;
+                entity.HomeAddress = person.HomeAddress;
+                entity.InvoiceAddress = person.InvoiceAddress;
+                entity.LastName = person.LastName;
+                entity.NickName = person.NickName;
+            }
+
+            context.SaveChanges();
+
+            return entity;
+        }
+    }
+
+
+}