SimpleNet.Standard.Data.PostgresSql 2.0.2

SimpleNet.Standard

SimpleNet.Standard.Data is a .NET Standard implementation of a DAL (Data Access Layer) with the hopes of simlifying execution of SQL Statements.

SimpleNet.Standard.Data.SqlServer

An implementation of ISimpleDatabaseProvider for SQL Server databases.

How To

1. Include SimpleNet.Standard.Data and SimpleNet.Standard.Data.SqlServer in your project

2. Create an instance of ISimpleDatabaseProvider ()

var dbProvider = new SqlServerProvider("Your SQL server Connection String");

3. Create an instance of ISimpleDataAccessLayer

var dal = new SimpleDataAccessLayer(dbProvider);

4. Execute SQL statements

     dal.ExecuteNonQuery (  
            "UPDATE Table SET Col1=@param1 WHERE Id = @Id ",
            CommandType.Text,
            new []{ 
                dbProvider.GetParameter("@param1", someValue) ,
                 dbProvider.GetParameter("@id", someId) 
            });


    dal.ExecuteScalar (  
        "SELECT SomeValue FROM TABLE WHERE Id = @Id ",
        CommandType.Text,
        new []{ 
             dbProvider.GetParameter("@id", someId) 
        });

5. Selecting records from the database?

We prefer working with objects instead of datatables, to enable this functionality we require and implementation of IRowMapper<T> to be provided when we Read data. We are using the IRowMapper implementation as originally implemented by Enterprise Library's Data Access Block

  ``` 
   const string SQL = @"SELECT Id, Code, Name FROM STATE s where s.Id = @Id";
	var records = dal.Read<State>(StateMapper, SQL, CommandType.Text, new[]
			{
				dbProvider.GetDbParameter("@Id", id)
			});
  ```

IRowMapper<T> Examples

Note: Please review documentation from Enterprise Libary Data Access Block to Find out more about IRowMapper

 // Map all properties on the object.
private static readonly IRowMapper<State> StateMapper = MapBuilder<State>.BuildAllProperties(); 

 // Map all properties by name ... override how we map name
private static readonly IRowMapper<State> StateRowMapper = MapBuilder<State>
            .MapAllProperties()
            .Map(x => x.Name).WithFunc(x => x["Name"].ToString())
            .Build(); 

 // Manually map some/all properties
private static readonly IRowMapper<State> StateRowMapper2 = MapBuilder<State>
        .MapNoProperties()
        .MapByName(x => x.Id)
        .Map(x => x.Code).ToColumn("Code")
        .Map(x => x.Name).WithFunc(x => x["Name"].ToString())
        .Build(); 

Working with IRepository<T> and AbstractSimpleRepository

1. Create a BaseRepository that extends AbstractSimpleRepository

    public class BaseSqlRepository : AbstractSimpleRepository
    {
        public override sealed ISimpleDataAccessLayer Database { get; set; }

         public BaseSqlRepository()
         {
            var dbProvider = new SqlServerProvider("Your SQL server Connection String");
            
            Database = new SimpleDataAccessLayer(dbProvider); 
         }
    }

2. Create your Repository class by extending BaseSqlRepository

    public class StateRepository : BaseSqlRepository, IStateRepository
    {
         // Please review documentation from Enterprise Libary Db Accessors to Find out more about IRowMapper
         
         private static readonly IRowMapper<State> StateMapper = MapBuilder<State>.BuildAllProperties();

         // sample 2
         private static readonly IRowMapper<State> StateRowMapper = MapBuilder<State>.MapAllProperties().Build();

          // sample 3 for mapping
         private static readonly IRowMapper<State> StateRowMapper2 = MapBuilder<State>
                   .MapNoProperties()
                   .MapByName(x => x.Id)
                   .Map(x => x.Code).ToColumn("Code")
                   .Map(x => x.Name).WithFunc(x => x["Name"].ToString())
                   .Build();



		public State GetById(int id)
		{
				const string SQL = @"SELECT Id, Code, Name FROM STATE s where s.Id = @Id";

				return Read<State>(StateMapper, SQL, CommandType.Text, new[]
				{
					GetDbParameter("@Id", id)
				}).FirstOrDefault();
		}


		public State GetAll(int id)
         	{
			const string SQL = @"SELECT Id, Code, Name FROM STATE s  ORDER BY s.Name ";

			return Read<State>(StateMapper, SQL, CommandType.Text, null).FirstOrDefault();
         	}


		public DataTable ReadById(int id)
		{
			const string SQL = @"SELECT Id, Code, Name FROM STATE s where s.Id = @Id";

			return Read(SQL, CommandType.Text, new[]
			{
				GetDbParameter("@Id", id)
			});
		}


		public State Create(State state)
		{
			const string SQL = @"INSERT INTO STATE (Code, Name)
								 VALUES (@Code, @Name);
								 SELECT SCOPE_IDENTITY()
									 ";

			var id = ExecuteScalar(SQL, CommandType.Text, new[]
			{
				GetDbParameter("@Code", state.Code),
				GetDbParameter("@Name", state.Name)
			});

			state.Id = Convert.ToInt32(id);

			return state;
		}


		public State Update(State state)
		{
			const string SQL = @" UPDATE STATE
			SET Code = @Code,
			Name = @Name
			WHERE Id = @Id
			";

			var id = ExecuteNonQuery(SQL, CommandType.Text, new[]
			{
				GetDbParameter("@Code", state.Code),
				GetDbParameter("@Name", state.Name),
				GetDbParameter("@Id", state.Id)
			});

			return state;
		}

    }

Working with database transactions

    using (var connection = dal.GetConnection())
    {
        using (var transaction = connection.BeginTransaction())
        {
            try{
        
                dal.ExecuteNonQuery(connection, ..... , transaction);
                ...     
                dal.ExecuteScalar(connection, ..... , transaction);
                ...
                transaction.Commit();

            }catch(){
                transaction.Rollback();
            }
        }
    }