Fourth task

WebApplication4.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.1.32421.90
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "WebApplication4", "WebApplication4\WebApplication4.csproj", "{E95014EE-311D-4740-B3A1-9DA25C9A67B4}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{E95014EE-311D-4740-B3A1-9DA25C9A67B4}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{E95014EE-311D-4740-B3A1-9DA25C9A67B4}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{E95014EE-311D-4740-B3A1-9DA25C9A67B4}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{E95014EE-311D-4740-B3A1-9DA25C9A67B4}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {CCFE820B-0A9D-4F01-BF0F-B6FD2D2F61A3}
+	EndGlobalSection
+EndGlobal

WebApplication4/Controllers/RegistrationsController.cs

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+using Microsoft.AspNetCore.Mvc;
+using Newtonsoft.Json;
+using Npgsql;
+using System.Data;
+using System.Net;
+
+// For more information on enabling Web API for empty projects, visit https://go.microsoft.com/fwlink/?LinkID=397860
+
+namespace WebApplication4.Controllers
+{
+    [Route("api/[controller]")]
+    [ApiController]
+    public class RegistrationsController : ControllerBase
+    {
+        private IConfiguration _configuration;
+
+        public RegistrationsController(IConfiguration configuration)
+        {
+            _configuration = configuration;
+        }
+
+
+        // GET: api/<RegistrationsController>
+        [HttpGet]
+        public string Get()
+        {
+            DataTable table = new DataTable();
+            NpgsqlDataReader myReader;
+
+            using (NpgsqlConnection myConn = new NpgsqlConnection(_configuration.GetConnectionString("DataBaseConfig")))
+            {
+                myConn.Open();
+                using (NpgsqlCommand command = new NpgsqlCommand("SELECT * FROM registrations;", myConn))
+                {
+                    myReader = command.ExecuteReader();
+                    table.Load(myReader); 
+
+                    myReader.Close();
+                    myConn.Close();
+                }
+            }
+
+            return JsonConvert.SerializeObject(table);
+        }
+
+        // GET api/<RegistrationsController>/5
+        [HttpGet("{id}")]
+        public string Get(int id)
+        {
+            DataTable table = new DataTable();
+            NpgsqlDataReader myReader;
+
+            using(NpgsqlConnection myConn = new NpgsqlConnection(_configuration.GetConnectionString("DataBaseConfig")))
+            {
+                myConn.Open();
+                using(NpgsqlCommand command = new NpgsqlCommand(String.Format("SELECT * FROM registrations WHERE id = {0};",id),myConn))
+                {
+                    myReader = command.ExecuteReader();
+                    table.Load(myReader);
+
+                    myReader.Close();
+                    myConn.Close();
+
+                }
+            }
+
+            if (table.Rows.Count == 0)
+                return JsonConvert.SerializeObject(new { status = "400", message = "invalid id" });
+
+
+            return  JsonConvert.SerializeObject(table);
+        }
+
+        [HttpGet("search")]
+        public string Get([FromQuery] string? sort_by = "", [FromQuery] string? sort_type = "ASC", [FromQuery] string? search_string = "")
+        {
+            DataTable table = new DataTable();
+            HttpResponseMessage response = new HttpResponseMessage();
+            NpgsqlDataReader myReader;
+            string query = "SELECT * FROM registrations ";
+
+            if (sort_by.Length > 0)
+                query+=String.Format("ORDER BY {0} {1};", sort_by, sort_type);
+
+            using (NpgsqlConnection myConn = new NpgsqlConnection(_configuration.GetConnectionString("DataBaseConfig")))
+            {
+                myConn.Open();
+                using (NpgsqlCommand command = new NpgsqlCommand(query, myConn))
+                {
+                    try
+                    {
+                        myReader = command.ExecuteReader();
+                    }catch (Exception ex)
+                    {
+                        return JsonConvert.SerializeObject(new {status = "200", message = "invalid params"});
+                    }
+
+                    table.Load(myReader);
+
+                    myReader.Close();
+                    myConn.Close();
+
+                }
+            }
+
+            if(search_string.Length < 1)
+            {
+                return JsonConvert.SerializeObject(table);
+            }
+
+
+            for (int i = 0; i < table.Rows.Count; i++)
+            {
+                bool deleteRow = true;
+
+                for(int j = 0; j < table.Columns.Count; ++j)
+                {
+                    if(table.Rows[i][j].ToString().Contains(search_string))
+                    {
+                        deleteRow = false;
+                    }
+                }
+
+
+                if (deleteRow)
+                {
+                    table.Rows.Remove(table.Rows[i]);
+                    i--;
+                }
+            }
+            return JsonConvert.SerializeObject(table);
+
+        }
+
+        // POST api/<RegistrationsController>
+        [HttpPost]
+        public string Post([FromBody] REGISTRATION_CERTIFICATE value)
+        {
+            try
+            {
+                value.validateWholeClass();
+            }catch (Exception ex)
+            {
+                return JsonConvert.SerializeObject(new { status = "400", message = ex.Message });
+            }
+
+            int count = 0;
+            using (NpgsqlConnection myConn = new NpgsqlConnection(_configuration.GetConnectionString("DataBaseConfig")))
+            {
+                string guery = String.Format("INSERT INTO registrations (registration_number,vin_code,car,date_of_registration,year_of_manufacture)" +
+                    "VALUES ('{0}', '{1}', '{2}', '{3}', '{4}')", value.registration_number, value.vin_code, value.car, value.date_of_registration, value.year_of_manufacture);
+
+                myConn.Open();
+                using (NpgsqlCommand command = new NpgsqlCommand(guery, myConn))
+                {
+                    try
+                    {
+                        count = command.ExecuteNonQuery();
+                    }catch(Exception ex)
+                    {
+                        return JsonConvert.SerializeObject(new { status = "400", message = "Invalid values." });
+                    }
+
+                    myConn.Close();
+
+                }
+
+            }
+
+            if (count < 1)
+            {
+                return JsonConvert.SerializeObject(new { status = "200", message = "invalid id" });
+            }
+
+            return JsonConvert.SerializeObject(new { status = "200", message = "Customer has been successfully added" });
+        }
+
+        // PUT api/<RegistrationsController>/5
+        [HttpPut("{id}")]
+        public string Put(int id, [FromBody] REGISTRATION_CERTIFICATE value)
+        {
+            try
+            {
+                value.validateWholeClass();
+            }
+            catch (Exception ex)
+            {
+                return JsonConvert.SerializeObject(new { status = "400", message = ex.Message });
+            }
+
+            int count = 0;
+            using (NpgsqlConnection myConn = new NpgsqlConnection(_configuration.GetConnectionString("DataBaseConfig")))
+            {
+                string guery = String.Format("update registrations set registration_number = '{0}' , vin_code = '{1}' ," +
+                    " car = '{2}' , date_of_registration = '{3}' , year_of_manufacture = '{4}' " +
+                    "WHERE id = {5};", value.registration_number, value.vin_code, value.car, value.date_of_registration, value.year_of_manufacture, id);
+
+                myConn.Open();
+                using (NpgsqlCommand command = new NpgsqlCommand(guery, myConn))
+                {
+                    count = command.ExecuteNonQuery();
+
+
+                    myConn.Close();
+
+                }
+
+            }
+
+            if (count < 1)
+            {
+                return JsonConvert.SerializeObject(new { status = "400", message = "invalid id" });
+            }
+
+            return JsonConvert.SerializeObject(new { status = "200", message = "Customer has been successfully updated" });
+        }
+
+        // DELETE api/<RegistrationsController>/5
+        [HttpDelete("{id}")]
+        public Task<HttpResponseMessage> Delete(int id)
+        {
+            int count = 0;
+            using (NpgsqlConnection myConn = new NpgsqlConnection(_configuration.GetConnectionString("DataBaseConfig")))
+            {
+                myConn.Open();
+                using (NpgsqlCommand command = new NpgsqlCommand(String.Format("DELETE FROM registrations WHERE id = {0};", id), myConn))
+                {
+                    count = command.ExecuteNonQuery();
+                    myConn.Close();
+
+                }
+            }
+            HttpResponseMessage response = new HttpResponseMessage();
+            if (count < 1)
+            {
+                response.StatusCode = HttpStatusCode.BadRequest;
+                response.Content = new StringContent("Customer is not found");
+            }else
+            {
+                response.StatusCode = HttpStatusCode.OK;
+                response.Content = new StringContent("Customer has been successfully deleted.");
+            }
+            return Task.FromResult(response);
+        }
+    }
+}

WebApplication4/Program.cs

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+var builder = WebApplication.CreateBuilder(args);
+
+// Add services to the container.
+
+builder.Services.AddControllers();
+// Learn more about configuring Swagger/OpenAPI at https://aka.ms/aspnetcore/swashbuckle
+builder.Services.AddEndpointsApiExplorer();
+builder.Services.AddSwaggerGen();
+
+var app = builder.Build();
+
+// Configure the HTTP request pipeline.
+if (app.Environment.IsDevelopment())
+{
+    app.UseSwagger();
+    app.UseSwaggerUI();
+}
+
+app.UseHttpsRedirection();
+
+app.UseAuthorization();
+
+app.MapControllers();
+
+app.Run();

WebApplication4/Properties/launchSettings.json

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+{
+  "$schema": "https://json.schemastore.org/launchsettings.json",
+  "iisSettings": {
+    "windowsAuthentication": false,
+    "anonymousAuthentication": true,
+    "iisExpress": {
+      "applicationUrl": "http://localhost:29940",
+      "sslPort": 44344
+    }
+  },
+  "profiles": {
+    "WebApplication4": {
+      "commandName": "Project",
+      "dotnetRunMessages": true,
+      "launchBrowser": true,
+      "launchUrl": "swagger",
+      "applicationUrl": "https://localhost:7134;http://localhost:5134",
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development"
+      }
+    },
+    "IIS Express": {
+      "commandName": "IISExpress",
+      "launchBrowser": true,
+      "launchUrl": "swagger",
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development"
+      }
+    }
+  }
+}