added generate migration script

modules/docs/app/VoloDocs.Migrator/Program.cs

@@ -1,4 +1,6 @@
 using System;
+using System.IO;
+using System.Linq;
 using Microsoft.EntityFrameworkCore;
 using Volo.Abp;
 using VoloDocs.EntityFrameworkCore;
@@ -7,6 +9,8 @@ namespace VoloDocs.Migrator
 {
     class Program
     {
+        private const string ScriptFile = "Script.txt";
+
         static void Main(string[] args)
         {
             Console.WriteLine("Initializing VoloDocs Migrator ... ");
@@ -21,48 +25,72 @@ namespace VoloDocs.Migrator
 
                     Console.Clear();
 
-                    Console.Write("\nThis program updates an existing database or creates a new one if not exists.\n" +
-                                      "The following connection string will be used:\n\n" +
-                                      new string('=', 70) + "\n" +
-                                      connectionString + "\n" +
-                                      new string('=', 70) + "\n\n" +
-                                      "Do you confirm to run the migration? (y/n) ");
+                    if (args != null && args.Contains("-script"))
+                    {
+                        GenerateMigrationScript(dbContext);
+                        return;
+                    }
+
+                    RunMigrations(connectionString, dbContext);
+                }
+
+                Console.WriteLine("\n\nPress ENTER to exit...");
+                Console.ReadLine();
+            }
+        }
+
+        private static void RunMigrations(string connectionString, VoloDocsDbContext dbContext)
+        {
+            Console.Write("\nThis program updates an existing database or creates a new one if not exists.\n" +
+                          "The following connection string will be used:\n\n" +
+                          new string('=', 70) + "\n" +
+                          connectionString + "\n" +
+                          new string('=', 70) + "\n\n" +
+                          "Are you sure you want to run the migration? (y/n) ");
+
+            if (Console.ReadKey().Key == ConsoleKey.Y)
+            {
+                Console.WriteLine("\nMigrating...");
+
+                try
+                {
+                    dbContext.Database.Migrate();
+
+                    Console.WriteLine("\nCompleted.");
+                }
+                catch (Exception ex)
+                {
+                    Console.WriteLine(ex.Message);
+
+                    while (ex.InnerException != null)
+                    {
+                        ex = ex.InnerException;
+                        Console.WriteLine(ex.Message);
+                    }
+
+                    Console.Write("\nThere was problem while applying migrations. " +
+                                  "Do you want to create the migration script? (y/n) ");
 
                     if (Console.ReadKey().Key == ConsoleKey.Y)
                     {
-                        try
-                        {
-                            Console.WriteLine("\nMigrating...");
-
-                            dbContext.Database.Migrate();
-
-                            Console.WriteLine("\nCompleted.");
-
-                            Console.Write("\nDo you want to see the applied migrations? (y/n) ");
-                            if (Console.ReadKey().Key == ConsoleKey.Y)
-                            {
-                                Console.WriteLine("\n\n-- start of migrations --");
-                                
-                                var appliedMigrations = dbContext.Database.GetAppliedMigrations();
-                                foreach (var appliedMigration in appliedMigrations)
-                                {
-                                    Console.WriteLine(appliedMigration);
-                                }
-
-                                Console.WriteLine("-- end of migrations --\n");
-                            }
-                        }
-                        catch (Exception ex)
-                        {
-                            Console.Write("\nAn error occured while migrating the database:\n");
-                            Console.Write(ex.ToString());
-                        }
+                        GenerateMigrationScript(dbContext);
                     }
                 }
+            }
+        }
 
-                Console.WriteLine("Press ENTER to exit...");
-                Console.ReadLine();
+        private static void GenerateMigrationScript(VoloDocsDbContext dbContext)
+        {
+            if (File.Exists(ScriptFile))
+            {
+                File.Delete(ScriptFile);
             }
+
+            Console.Write("\nGenerating migration scripts...");
+
+            File.WriteAllText(ScriptFile, dbContext.Database.GenerateCreateScript());
+            
+            Console.Write("\nMigration script has been created to Script.txt file");
         }
     }
-}
+}