La majorité des applications actuelles ont besoin d’enregistrer des informations dans une base de données locale ou serveur. Plusieurs outils existent dont Entity Framework, le plus fréquemment proposés par Microsoft, ou ADO.NET, le plus performant mais le plus complexe à exploiter. Depuis plusieurs années, nous avons construit un ensemble d’outils simples afin de nous aider dans la fabrication de la DAL de nos projets, et plus particulièrement dans la recherche de données en les transformant facilement en objets .NET.

1. Simple Object Mapping
pour SQL Databases
Développer simplement et rapidement
dvoituron@outlook.com
www.dvoituron.com
@DenisVoituron

2. 2
A propos…
Denis Voituron
1995 – Ingénieur Civil
1999 – Co-fondateur d’une société spécialisée dans les CMS
2007 – Microsoft Senior Architect chez Trasys / NRB
2
@DenisVoituron
dvoituron.com
.be

3. 3
Agenda
• Background
• SQL Architecture
• ADO.NET
• EntityFramework
• Comparaison
• Simple Object Mapping
• Dapper.NET
• SqlDatabaseCommand
• SQLite
• SQL Server CLR Stored Procedures
3

4. Backgound

5. 5
Architecture

6. SCOTT Database
EMPNO ENAME JOB MGR HIREDATE SAL COMM DEPTNO
7839 KING PRESIDENT 17-NOV-81 5000 10
7698 BLAKE MANAGER 7839 01-MAY-81 2850 30
7756 CLARK MANAGER 7839 09-JUN-81 1500 10
... ...
... ...
7456 JONES MANAGER 7839 02-APR-81 2975 20
DEPTNO DNAME LOC
10 ACCOUNTING NEW YORK
20 RESEARCH DALLAS
30 SALES CHICAGO
40 OPERATIOS BOSTON

7. 7
ADO.NET
7
using (var connection = new SqlConnection(CONNECTION_STRING))
{
connection.Open();
connection.Close();
}
SELECT ENAME FROM EMP WHERE EMPNO = 7369
using (var cmd = connection.CreateCommand())
{
cmd.CommandText = "SELECT ENAME " +
" FROM EMP " +
" WHERE EMPNO = 7369 ";
}
using (var adapter = new SqlDataAdapter(cmd))
{
DataTable table = new DataTable();
adapter.Fill(table);
string name = table.Rows[0].Field<string>("ENAME");
}

8. 8
Entity Framework
8
Object Relational Mapping
var db = new SCOTTEntities();
var query = from e in db.EMPs
where e.EMPNO == 7369
select e;
var name = query.First().DEPT.DNAME;
SELECT TOP (1)
[Extent1].[EMPNO] AS [EMPNO],
[Extent1].[ENAME] AS [ENAME],
[Extent1].[JOB] AS [JOB],
[Extent1].[MGR] AS [MGR],
[Extent1].[HIREDATE] AS [HIREDATE],
[Extent1].[SAL] AS [SAL],
[Extent1].[COMM] AS [COMM],
[Extent1].[DEPTNO] AS [DEPTNO]
FROM [dbo].[EMP] AS [Extent1]
WHERE 7369 = [Extent1].[EMPNO]
SELECT
[Extent1].[DEPTNO] AS [DEPTNO],
[Extent1].[DNAME] AS [DNAME],
[Extent1].[LOC] AS [LOC]
FROM [dbo].[DEPT] AS [Extent1]
WHERE [Extent1].[DEPTNO] = @V1

9. 9
ADO.NET vs Entity Framework
9
Performance
Speed of Development
Maintainable code (neat)
Flexibility
Scalability
http://stackoverflow.com/questions/2698151/entity-framework-vs-linq-to-sql-vs-ado-net-with-stored-procedures

10. 10
Performances
10http://blogs.msdn.com/b/adonet/archive/2012/02/14/sneak-preview-entity-framework-5-0-performance-improvements.aspx

11. Simple Object Mapping

12. 12
Dapper.NET
Bibliothèque qui étend IDbConnection.
Besoin d’une connexion déjà ouverte.
using (var connection = new SqlConnection(CONNECTION_STRING))
{
connection.Open();
string sql = "SELECT * FROM EMP WHERE EMPNO = @Id";
var emp = connection.Query<EMP>(sql, new { Id = 7369 });
}

13. 13
 Query
 Query Dynamic
 ExecuteScalar
 Execute
 Buffered
Dapper.NET
string sql = "SELECT * FROM EMP WHERE EMPNO = @Id";
var emp = connection.Query<EMP>(sql, new { Id = 7369 });
string sql = "SELECT * FROM EMP WHERE EMPNO = @Id";
var emp = connection.Query(sql, new { Id = 7369 });
string sql = "SELECT ENAME FROM EMP WHERE EMPNO = @Id";
var emp = connection.ExecuteScalar<string>(sql, new { Id = 7369 });
var n = connection.Execute(“DELETE FROM EMP");
var emp = connection.Query(sql, buffered: false);

14. 14
SqlDatabaseCommand
Objets and Commandes
 Construction et destruction propres
 Optimisation des paramètres (éviter l’injection SQL) et SQL
 Conversion automatique d’objets C#
 Génération des entités C#
 Gestion des logs et traces
Méthodes d’extension de System.Data
 Transformation des propriétés C# en paramètres SQL
 DBNull
 ...

15. 15
SqlDatabaseCommand
Exemple
using (var cmd = new SqlDatabaseCommand(CONNECTION_STRING))
{
}
cmd.CommandText.AppendLine(" SELECT * ");
cmd.CommandText.AppendLine(" FROM EMP ");
var emps = cmd.ExecuteTable<Employee>();
cmd.CommandText.AppendLine(" WHERE HIREDATE = @HireDate ");
cmd.Parameters.AddValues(new
{
HireDate = new DateTime(1980, 12, 17)
});

16. 16
9876 NEW
SqlDatabaseCommand EMPNO ENAME
7839 KING
7698 BLAKE
7756 CLARK
...
...
7456 JONES
var emps = cmd.ExecuteTable<Employee>();
• ExecuteTable
var smith = cmd.ExecuteRow<Employee>();
• ExecuteRow
var name = cmd.ExecuteScalar<String>();
• ExecuteScalar
var n = cmd.ExecuteNonQuery();
• ExecuteQuery

17. 17
SqlDatabaseCommand
Paramètres
cmd.CommandText.AppendLine(" SELECT ENAME ")
.AppendLine(" FROM EMP ")
.AppendLine(" WHERE EMPNO = @EmpNo ")
.AppendLine(" AND HIREDATE = @HireDate ");
cmd.Parameters.AddWithValue("@EmpNo", 7369);
cmd.Parameters.AddWithValue("@HireDate", new DateTime(1980, 12, 17));
var name = cmd.ExecuteScalar();
cmd.CommandText.AppendLine(" SELECT ENAME ")
.AppendLine(" FROM EMP ")
.AppendLine(" WHERE EMPNO = @EmpNo ")
.AppendLine(" AND HIREDATE = @HireDate ");
cmd.Parameters.AddValues(new
{
EmpNo = 7369,
HireDate = new DateTime(1980, 12, 17)
});
var name = cmd.ExecuteScalar();

18. 18
SqlDatabaseCommand
Traces
 Logging
 Query Formatter
cmd.Log = Console.WriteLine;
cmd.Log = (message) =>
{
Console.WriteLine(message);
};
string formatted = cmd.GetCommandTextFormatted(QueryFormat.Text);
SELECT ENAME
FROM EMP
WHERE EMPNO = 7369
AND HIREDATE = '1970-05-04 14:15:16'
string formatted = cmd.GetCommandTextFormatted(QueryFormat.Html);
SELECT ENAME
FROM EMP
WHERE EMPNO = 7369
AND HIREDATE = '1970-05-04 14:15:16'

19. 19
SqlDatabaseCommand
Générateur d’entités // *********************************************
// Code Generated with Apps72.Dev.Data.Generator
// *********************************************
using System;
namespace Data.Tests.Entities
{
/// <summary />
public partial class BONUS
{
/// <summary />
public virtual String ENAME { get; set; }
/// <summary />
public virtual String JOB { get; set; }
/// <summary />
public virtual Int32? SAL { get; set; }
/// <summary />
public virtual Int32? COMM { get; set; }
}
/// <summary />
public partial class DEPT
{
/// <summary />
public virtual Int32 DEPTNO { get; set; }
/// <summary />
public virtual String DNAME { get; set; }
/// <summary />
public virtual String LOC { get; set; }
}
var entitiesGenerator = new SqlEntitiesGenerator(CONNECTION_STRING);
foreach (var table in entitiesGenerator.Tables)
{
...
}

20. 20
SqlDatabaseCommand
Bonnes pratiques
public class DataService : IDataService
{
public SqlDatabaseCommand GetDatabaseCommand()
{
return new SqlDatabaseCommand(CONNECTION_STRING);
}
public SqlDatabaseCommand GetDatabaseCommand(SqlTransaction trans)
{
return new SqlDatabaseCommand(trans.Connection, trans);
}
} using (var cmd = service.GetDatabaseCommand())
{
...
}

21. CLR Stored Procedures

22. 22
CLR Stored Procedures
Quoi ?
 Vous pouvez écrire des procédures stockées, des déclencheurs, des types, des fonctions,
des agrégats et des fonctions d’accès aux tables, à l'aide du langage .NET Framework
Pourquoi ?
 Performances
 Outils de développement (VS, GIT, …)
 Centralisation du code
 Déploiement

23. 23
SqlDatabaseCommand
1. Créer une bibliothèque de classe
2. Ajouter le package NuGet SqlServerClr

24. 24
SqlDatabaseCommand
[SqlFunction(DataAccess = DataAccessKind.Read)]
public static int GetMaximumAge()
{
using (var cmd = new SqlDatabaseCommand("context connection=true"))
{
...
}
}
CREATE FUNCTION GetMaximumAge()
RETURNS INT
AS EXTERNAL NAME SampleSqlDatabaseCommandClr.SampleCLR.GetMaximumAge

25. 25
SqlDatabaseCommand
[SqlFunction()]
public static bool IsComparableTo(string text1, string text2)
{
return text1.ComparableTo(text2) == 0;
}
SELECT dbo.IsComparableTo('Maison', 'House') -- FALSE
SELECT dbo.IsComparableTo('St Ecole', 'Saint''école&') -- TRUE
SELECT dbo.IsComparableTo('A''&é', 'aE') -- TRUE

26. ADO.NET
EntityFramework
SQLite
Dapper.NET
SqlDatabaseCommand
CLR Stored Procedure
Conclusion & Questions

27. Merci de votre participation
dvoituron@outlook.com
www.dvoituron.com
@DenisVoituron