first commit

External/Implementations/Postgres/VehicleDataAccess.cs

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+using MotoVaultPro.External.Interfaces;
+using MotoVaultPro.Models;
+using Npgsql;
+using System.Text.Json;
+
+namespace MotoVaultPro.External.Implementations
+{
+    public class PGVehicleDataAccess: IVehicleDataAccess
+    {
+        private NpgsqlDataSource pgDataSource;
+        private readonly ILogger<PGVehicleDataAccess> _logger;
+        private static string tableName = "vehicles";
+        public PGVehicleDataAccess(IConfiguration config, ILogger<PGVehicleDataAccess> logger)
+        {
+            pgDataSource = NpgsqlDataSource.Create(config["POSTGRES_CONNECTION"]);
+            _logger = logger;
+            try
+            {
+                //create table if not exist.
+                string initCMD = $"CREATE SCHEMA IF NOT EXISTS app; CREATE TABLE IF NOT EXISTS app.{tableName} (id INT GENERATED BY DEFAULT AS IDENTITY primary key, data jsonb not null)";
+                using (var ctext = pgDataSource.CreateCommand(initCMD))
+                {
+                    ctext.ExecuteNonQuery();
+                }
+            } catch (Exception ex)
+            {
+                _logger.LogError(ex.Message);
+            }
+        }
+        public bool SaveVehicle(Vehicle vehicle)
+        {
+            try
+            {
+                if (string.IsNullOrWhiteSpace(vehicle.ImageLocation))
+                {
+                    vehicle.ImageLocation = "/defaults/noimage.png";
+                }
+                if (vehicle.Id == default)
+                {
+                    string cmd = $"INSERT INTO app.{tableName} (data) VALUES(CAST(@data AS jsonb)) RETURNING id";
+                    using (var ctext = pgDataSource.CreateCommand(cmd))
+                    {
+                        ctext.Parameters.AddWithValue("data", "{}");
+                        vehicle.Id = Convert.ToInt32(ctext.ExecuteScalar());
+                        //update json data
+                        if (vehicle.Id != default)
+                        {
+                            string cmdU = $"UPDATE app.{tableName} SET data = CAST(@data AS jsonb) WHERE id = @id";
+                            using (var ctextU = pgDataSource.CreateCommand(cmdU))
+                            {
+                                var serializedData = JsonSerializer.Serialize(vehicle);
+                                ctextU.Parameters.AddWithValue("id", vehicle.Id);
+                                ctextU.Parameters.AddWithValue("data", serializedData);
+                                return ctextU.ExecuteNonQuery() > 0;
+                            }
+                        }
+                        return vehicle.Id != default;
+                    }
+                }
+                else
+                {
+                    string cmd = $"UPDATE app.{tableName} SET data = CAST(@data AS jsonb) WHERE id = @id";
+                    using (var ctext = pgDataSource.CreateCommand(cmd))
+                    {
+                        var serializedData = JsonSerializer.Serialize(vehicle);
+                        ctext.Parameters.AddWithValue("id", vehicle.Id);
+                        ctext.Parameters.AddWithValue("data", serializedData);
+                        return ctext.ExecuteNonQuery() > 0;
+                    }
+                }
+            } catch (Exception ex)
+            {
+                _logger.LogError(ex.Message);
+            }
+            return false;
+        }
+        public bool DeleteVehicle(int vehicleId)
+        {
+            try
+            {
+                string cmd = $"DELETE FROM app.{tableName} WHERE id = @id";
+                using (var ctext = pgDataSource.CreateCommand(cmd))
+                {
+                    ctext.Parameters.AddWithValue("id", vehicleId);
+                    return ctext.ExecuteNonQuery() > 0;
+                }
+            } catch (Exception ex)
+            {
+                _logger.LogError(ex.Message);
+                return false;
+            }
+        }
+        public List<Vehicle> GetVehicles()
+        {
+            try
+            {
+                string cmd = $"SELECT id, data FROM app.{tableName} ORDER BY id ASC";
+                var results = new List<Vehicle>();
+                using (var ctext = pgDataSource.CreateCommand(cmd))
+                {
+                    using (NpgsqlDataReader reader = ctext.ExecuteReader())
+                        while (reader.Read())
+                        {
+                            Vehicle vehicle = JsonSerializer.Deserialize<Vehicle>(reader["data"] as string);
+                            results.Add(vehicle);
+                        }
+                }
+                return results;
+            } catch (Exception ex)
+            {
+                _logger.LogError(ex.Message);
+                return new List<Vehicle>();
+            }
+        }
+        public Vehicle GetVehicleById(int vehicleId)
+        {
+            try
+            {
+                string cmd = $"SELECT id, data FROM app.{tableName} WHERE id = @id";
+                Vehicle vehicle = new Vehicle();
+                using (var ctext = pgDataSource.CreateCommand(cmd))
+                {
+                    ctext.Parameters.AddWithValue("id", vehicleId);
+                    using (NpgsqlDataReader reader = ctext.ExecuteReader())
+                        while (reader.Read())
+                        {
+                            vehicle = JsonSerializer.Deserialize<Vehicle>(reader["data"] as string);
+                        }
+                }
+                return vehicle;
+            } catch (Exception ex)
+            {
+                _logger.LogError(ex.Message);
+                return new Vehicle();
+            }
+        }
+    }
+}