Very short and simple example of using SqlMetal

A simple sample of how to use SqlMetal.

"Code Generation Tool (SqlMetal.exe)"

https://msdn.microsoft.com/en-us/library/bb386987.aspx

This tool will create mappings and code for LINQ to SQL.

So, as mentioned, simple and short. Create a database, some tables and insert some data.

create database VeryMetal

go

use VeryMetal

go

create table Users (UserId int primary key, FirstName nvarchar(10), LastName nvarchar(10), DepartmentId int)

go

create table Departments(DepartmentId int primary key, DepartmentName nvarchar(10))

go

--Insert some users and departments

insert into Users values (1, 'John', 'Johnson', 1)

insert into Users values (2, 'Paul', 'Paulson', 2)

insert into Users values (3, 'Mike', 'Mikeson', 1)

insert into Users values (4, 'Mary', 'Maryson', 2)

insert into Departments values (1, 'Support')

insert into Departments values (2, 'Finance')

Then fire up the Visual Studio Command Prompt and run the following:

Sqlmetal /server:<your server> /database:VeryMetal /code:C:\Temp\MetalCode.cs /map:C:\Temp\MetalMap.xml /namespace:VeryMetalEntities

This should now have generated the .cs and .xml files.

So, create new console application, add the MetalCode file to the project and enter the following code:

        static void Main(string[] args)

        {

            try

            {

                String cs = @"Data Source=<your server>;Initial Catalog=VeryMetal;Integrated Security=True";

                String file = @"C:\Temp\MetalMap.xml";

                var dc = new VeryMetal(cs, XmlMappingSource.FromUrl(file));

                var users = from u in dc.Users where u.DepartmentId == 1 select u;

               

                Console.WriteLine("All users in Support Department.");

                foreach (var user in users)

                {

                    Console.WriteLine("{0} - {1}", user.FirstName, user.LastName);

                }

                Console.WriteLine("\nGet single user with firstname starting with Pau ");

                Table<Users> ut = dc.GetTable<Users>();

                var users2 = ut.Single(x => x.FirstName.StartsWith("Pau"));

              Console.WriteLine("{0} - {1}", users2.FirstName, users2.LastName);

               

            }

            catch (Exception ex)

            {

                Console.WriteLine(ex);

            }

        }

Output should be:

All users in Support Department.

John - Johnson

Mike - Mikeson

Get single user with firstname starting with Pau

Paul - Paulson

Comments

• Anonymous
  September 02, 2012
  Dude - use variable names which HELP in describing what you are doing, especially since this is an "example".  "String cs" and String file" are truly useless variable names.  File?  What file?  Oh a "Mapping File".  And a "dc", yeah, like Washington DC I guess.  It is supposed to be an 'e'.  What?  Oh yeah, the 'e' stands for 'example' - sorry. Lastly, put in a foreign key and/or at least do your parent/child inserts in the right order. Parent always comes first, then the child. These are simple, obvious, common sense things that every developer should follow - but few actually do.

• Anonymous
  December 27, 2013
  Wow Bill, try kicking your dog first before commenting.

• Anonymous
  July 23, 2014
  The comment has been removed