редакция дб для клиента, создала реализацию для чека

BeautySalon/BeautySalonDBModels/Implements/ChequeDB.cs

@@ -0,0 +1,79 @@
+using BeautySalonDBModels.Models;
+using Npgsql;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace BeautySalonDBModels.Implements
+{
+    public class ChequeDB : AbstractWorkWithStorage<Cheque>
+    {
+        public override void Add(Cheque cheque)
+        {
+            using var conn = GetConnection();
+            conn.Open();
+            using var cmd = new NpgsqlCommand("INSERT INTO cheques (client_id, reception_id) VALUES (@ClientId, @ReceptionId)", conn);
+            cmd.Parameters.AddWithValue("@ClientId", cheque.ClientId);
+            cmd.Parameters.AddWithValue("@ReceptionId", cheque.ReceptionId);
+            cmd.ExecuteNonQuery();
+        }
+
+        public override Cheque? GetObject(int id)
+        {
+            using var conn = GetConnection();
+            conn.Open();
+            using var cmd = new NpgsqlCommand("SELECT * FROM cheques WHERE cheque_id = {id}", conn);
+            using var reader = cmd.ExecuteReader();
+            if (reader.Read())
+            {
+                return new Cheque
+                {
+                    ChequeId = reader.GetInt32(0),
+                    ClientId = reader.GetInt32(1),
+                    ReceptionId = reader.GetInt32(2)
+                };
+            }
+            return null;
+        }
+
+        public override List<Cheque> GetObjects()
+        {
+            var cheques = new List<Cheque>();
+            using var conn = GetConnection();
+            conn.Open();
+            using var cmd = new NpgsqlCommand("SELECT * FROM cheques order by cheque_id", conn);
+            using var reader = cmd.ExecuteReader();
+            while (reader.Read())
+            {
+                cheques.Add(new Cheque
+                {
+                    ChequeId = reader.GetInt32(0),
+                    ClientId = reader.GetInt32(1),
+                    ReceptionId = reader.GetInt32(2)
+                });
+            }
+            return cheques;
+        }
+
+        public override Cheque? Remove(int id)
+        {
+            var cheque = GetObject(id);
+            using var conn = GetConnection();
+            conn.Open();
+            using var cmd = new NpgsqlCommand("delete from cheques where cheque_id = {id}", conn);
+            cmd.ExecuteNonQuery();
+            return cheque;
+        }
+
+        public override void Update(Cheque cheque)
+        {
+            using var conn = GetConnection();
+            conn.Open();
+            using var cmd = new NpgsqlCommand("update cheque set client_id = {cheque.ClientId}, " +
+                "reception_id = {cheque.ReceptionId} where cheque_id = {cheque.ChequeId}", conn);
+            cmd.ExecuteNonQuery();
+        }
+    }
+}

BeautySalon/BeautySalonDBModels/Implements/ClientDB.cs

@@ -38,7 +38,7 @@ namespace BeautySalonDBModels.Implements
             var clients = new List<Client>();
             using var conn = GetConnection();
             conn.Open();
-            using var cmd = new NpgsqlCommand("SELECT * FROM clients order by id", conn);
+            using var cmd = new NpgsqlCommand("SELECT * FROM clients order by client_id", conn);
             using var reader = cmd.ExecuteReader();
             while (reader.Read())
             {
@@ -58,12 +58,17 @@ namespace BeautySalonDBModels.Implements
             using var conn = GetConnection();
             conn.Open();
             using var cmd = new NpgsqlCommand("delete from clients where client_id = {id}", conn);
+            cmd.ExecuteNonQuery();
             return client;
         }
 
         public override void Update(Client client)
         {
-
+            using var conn = GetConnection();
+            conn.Open();
+            using var cmd = new NpgsqlCommand("update clients set fio = {client.FIO}, " +
+                "age = {client.Age} where client_id = {client.ClientId}", conn);
+            cmd.ExecuteNonQuery();
         }
     }
 }