Apps72.Dev.Data 4.0.0

DatabaseCommand - Simple Object Mapping

Go to https://apps72.com to learn how to use DatabaseCommand.

Introduction

This C# library simplify SQL Queries to external databases, using the standard class DbConnection and DotNetCore. Many implementations are compiled for SQL Server, Oracle Server or SQLite.

First, create a SqlConnection or an other DbConnection.

using (var cmd = new DatabaseCommand(mySqlConnection))
{
    cmd.CommandText = "SELECT ID, Name FROM EMployee";
    var all = cmd.ExecuteTable<Employee>();     // List of all employees
    var smith = cmd.ExecuteRow<Employee>();     // First employee
    var id = cmd.ExecuteScalar<int>();          // ID of first employee
    
    var emps = cmd.Query(" SELECT * FROM Employee WHERE ID > @ID ")
                  .AddParameter("@ID", 10)
                  .ExecuteTable<Employee>();
}

Requirements: Microsoft Framework 4.0 (Client Profile) for desktop applications, or SQL Server 2008 R2 for SQL CLR Stored procedures, or .NET Standard 2.0 for .NET Core library.

Basic Samples (video)

Performances

Performance is very important during development. You can check these values by starting the Performance project in the source code. Comparing to the famous projects Dapper and Entity Framework, you can see that:

• DatabaseCommand has identical performance when executing Scalar queries.
• DatabaseCommand is slightly less efficient than Dapper (35%) but significantly more efficient than EFCore.

This slight reduction of performance is due to all additional features included in DatabaseCommand: management of exceptions, Tags, Logs, ActionBeforeExecution and ActionAfterExecution events.

BenchmarkDotNet=v0.12.0, OS=Windows 10.0.18362
Intel Core i7-7700HQ CPU 2.80GHz (Kaby Lake), 1 CPU, 8 logical and 4 physical cores

------------------------------------------------------------------------------
           Execute Scalar             |           Execute Table
------------------------------------------------------------------------------
Dapper            |  80.18 µs         | Dapper           | 103.88 µs	
DatabaseCommand   |  81.86 µs  +2%    | DatabaseCommand  | 141.68 µs  +36%
EF Core           | 342.05 µs  +327%  | EF Core          | 315.30 µs  +204%
------------------------------------------------------------------------------