Code refactoring

.gitignore

@@ -3,3 +3,4 @@
 /.vscode
 *.db
 *.conf
+/publish

DatabaseRepository.cs

@@ -3,14 +3,9 @@ using Microsoft.AspNetCore.Mvc;
 
 namespace RestySqlite
 {
-    public class DatabaseRepository
+    public class DatabaseRepository(DatabaseWrapper db)
     {
-        private DatabaseWrapper _db;
+        private readonly DatabaseWrapper _db = db;
-
-        public DatabaseRepository(DatabaseWrapper db)
-        {
-            _db = db;
-        }
 
         public async Task<Dictionary<string, List<string>>?> ListTables()
         {
@@ -37,10 +32,10 @@ namespace RestySqlite
                     var scheme = _db.MapColumns();
                     var filtered = from tbl in scheme.Keys where tbl == table select scheme[tbl];
                     
-                    Dictionary<string, List<string>> result = new();
+                    var result = new Dictionary<string, List<string>>();
                     foreach (var column in filtered.Single())
                     {
-                        result.Add(column, _db.MapColumn(column, table));
+                        result.Add(column, _db.MapColumn(column, table) ?? throw new NullReferenceException("Column value is null!"));
                     }
 
                     return result;
@@ -69,25 +64,26 @@ namespace RestySqlite
             return await Task.Run(() => {
                 try
                 {
-                    var reader = _db.GetReader($"SELECT * FROM {table} WHERE id = {id}");
+                    var reader = _db.GetReader($"SELECT * FROM {table} WHERE id = {id}") ?? throw new NullReferenceException("Reader is null!");
                     /* var sqlCommand = "SELECT * FROM $table WHERE id = $id";
                     var reader = _db.GetReader(sqlCommand, 
                         new Parameter("$table", table),
                         new Parameter("$id", id)
                     ); */
-                    Dictionary<string, string> result = new();
+                    var result = new Dictionary<string, string>();
                     using (reader)
                     {
                         while (reader.Read())
                         {
                             foreach (var column in _db.MapColumns()[table])
                             {
+                                if (column == null) throw new NullReferenceException("Column value is null!");
                                 if (!result.ContainsKey(column))
-                                {
+                                {;
-                                    result.Add(column, reader[column].ToString());
+                                    result.Add(column, reader[column].ToString() ?? throw new NullReferenceException("Readed value is null!"));
                                     continue;
                                 } 
-                                result[column] = reader[column].ToString();
+                                result[column] = reader[column].ToString() ?? throw new NullReferenceException("Readed value is null!");
                                 
                             }
                         }

Utils.cs

@@ -44,5 +44,27 @@ namespace RestySqlite
                 return table[key];
             }
         }
+
+        public static void CreateDatabase(string databaseName)
+        {
+            Console.WriteLine("Would you like to create database? Y/N");
+            var input = Console.ReadKey().Key.ToString() ?? throw new NullReferenceException("Can't read key from user!") ;
+
+            if (input.ToUpper() != "Y") return;
+
+            File.Create($"{databaseName}.db");
+            Console.WriteLine("Now please, create first table inside database.");
+            Console.WriteLine("Input a valid SQL command: ");
+            var command = Console.ReadLine() ?? throw new NullReferenceException("Can't read command from user!");
+            try
+            {
+                new DatabaseWrapper(databaseName).ExecuteCommand(command);
+            }
+            catch (Exception e)
+            {
+                Console.WriteLine(e.Message);
+                return;
+            }
+        }
     }
 }

WebApi.cs

@@ -4,13 +4,12 @@ namespace RestySqlite
 {
     public class WebApi
     {
-        struct Command 
+
-        {
-            public string Sql;
-        }
         public static void Main()
         {
-            string dbName = Utils.ReadConfig("database", "sql");
+            string? dbName = Utils.ReadConfig("database", "sql") ?? throw new NullReferenceException("Database name is null!");
+            
+            
             if (dbName.Length == 0)
             {
                 Console.WriteLine("You should specify database name in conf.toml!");
@@ -20,12 +19,22 @@ namespace RestySqlite
             if (!File.Exists($"{dbName}.db"))
             {
                 Console.WriteLine($"Database {dbName}.db not found in folder!");
-                return;
+                Utils.CreateDatabase(dbName);
             }
 
-            string handle = Utils.ReadConfig("handle", "api");
+            string? handle = Utils.ReadConfig("handle", "api") ?? throw new NullReferenceException("API handle is null!");
+
+
             int port = Utils.ReadConfig("port", "api");
 
+            RunServer(dbName, handle, port);
+
+            
+        }
+
+        static public void RunServer(string dbName, string handle, int port)
+        {
+
             var builder = WebApplication.CreateBuilder();
 
             builder.WebHost.ConfigureKestrel(serverOptions =>
@@ -62,7 +71,5 @@ namespace RestySqlite
             app.Run();
         }
 
-
-
     }
 }