Grundlegene Funktionen geschrieben

dcnsanplanung.DAL/Services/PostgresqlData/PostgresqlDataService.cs

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+using Npgsql;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace dcnsanplanung.DAL.Services.PostgresqlData
+{
+    public class PostgresqlDataService : IDisposable
+    {
+        protected readonly string connString; // = "Host = localhost; Database = sanplaner; Username = dcnsanplaner; Password = sanplaner";
+        NpgsqlDataSource dataSource;
+        protected NpgsqlConnection? conn = null;
+        protected string tableName = "";
+
+        public PostgresqlDataService(string connectionstring, string tableName)
+        {
+            this.connString = connectionstring;
+            var dataSourceBuilder = new NpgsqlDataSourceBuilder(connString);
+            dataSource = dataSourceBuilder.Build();
+
+            conn = dataSource.OpenConnection();
+            this.tableName = string.Format("public.{0}", tableName);
+
+        }
+        public virtual async Task<bool> Delete(int id)
+        {
+            string command = $"DELETE " + tableName + " WHERE \"Id\" = @1";
+            await using (var cmd = new NpgsqlCommand(command, conn))
+            {
+                cmd.Parameters.AddWithValue("1", id);
+                int res = await cmd.ExecuteNonQueryAsync();
+            }
+            return true;
+        }
+        public void Dispose()
+        {
+            if (conn != null && conn.State == System.Data.ConnectionState.Open)
+            {
+                conn.Close();
+                conn.Dispose();
+            }
+        }
+
+    }
+}