diff --git a/.gitignore b/.gitignore
index ade385a..af8f539 100644
--- a/.gitignore
+++ b/.gitignore
@@ -387,4 +387,6 @@ FodyWeavers.xsd
 .idea/
 *.sln.iml
 
+appsettings.Development.json
+*.Development
 *.Development.json
\ No newline at end of file
diff --git a/Collaborateur_Epa_Back/espacecollab.backend.api/Program.cs b/Collaborateur_Epa_Back/espacecollab.backend.api/Program.cs
index 48863a6..cd1ba0a 100644
--- a/Collaborateur_Epa_Back/espacecollab.backend.api/Program.cs
+++ b/Collaborateur_Epa_Back/espacecollab.backend.api/Program.cs
@@ -1,25 +1,18 @@
-var builder = WebApplication.CreateBuilder(args);
-
-// Add services to the container.
-
-builder.Services.AddControllers();
-// Learn more about configuring Swagger/OpenAPI at https://aka.ms/aspnetcore/swashbuckle
-builder.Services.AddEndpointsApiExplorer();
-builder.Services.AddSwaggerGen();
-
-var app = builder.Build();
-
-// Configure the HTTP request pipeline.
-if (app.Environment.IsDevelopment())
+namespace Api
 {
-    app.UseSwagger();
-    app.UseSwaggerUI();
+    public static class Program
+    {
+        public static void Main(string[] args)
+        {
+            CreateHostBuilder(args).Build().Run();
+        }
+
+        public static IHostBuilder CreateHostBuilder(string[] args) =>
+            Host.CreateDefaultBuilder(args)
+                .ConfigureWebHostDefaults(webBuilder =>
+                {
+                    
+                    webBuilder.UseStartup<Startup>();
+                });
+    }
 }
-
-app.UseHttpsRedirection();
-
-app.UseAuthorization();
-
-app.MapControllers();
-
-app.Run();
diff --git a/Collaborateur_Epa_Back/espacecollab.backend.api/Startup.cs b/Collaborateur_Epa_Back/espacecollab.backend.api/Startup.cs
new file mode 100644
index 0000000..3a242e4
--- /dev/null
+++ b/Collaborateur_Epa_Back/espacecollab.backend.api/Startup.cs
@@ -0,0 +1,56 @@
+using espacecollab.backend.infrastructure.sql;
+using espacecollab.backend.infrastructure.sql.Options;
+
+namespace Api
+{
+    public class Startup
+    {
+        public IConfiguration Configuration { get; }
+        public Startup(IConfiguration configuration)
+        {
+            Configuration = configuration;
+        }
+
+        // This method gets called by the runtime. Use this method to add services to the container.
+        public void ConfigureServices(IServiceCollection services)
+        {
+            
+
+            IConfigurationSection sqlSection = Configuration.GetSection(SqlOption.Key);
+            services.Configure<SqlOption>(sqlSection);
+
+            SqlOption contextOptions = sqlSection.Get<SqlOption>();
+
+            services.AddControllers();
+            services.AddRouting(options => options.LowercaseUrls = true);
+
+            services.AddScoped<MainDbContext>();
+            
+            services.AddEndpointsApiExplorer();
+            services.AddSwaggerGen();
+        }
+
+        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
+        public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
+        {
+            if (env.IsDevelopment())
+            {
+                app.UseDeveloperExceptionPage();
+            }
+
+            app.UseSwagger();
+            app.UseSwaggerUI();
+
+            app.UseHttpsRedirection();
+
+            app.UseRouting();
+
+            app.UseAuthorization();
+
+            app.UseEndpoints(endpoints =>
+            {
+                endpoints.MapControllers();
+            });
+        }
+    }
+}
diff --git a/Collaborateur_Epa_Back/espacecollab.backend.api/appsettings.json b/Collaborateur_Epa_Back/espacecollab.backend.api/appsettings.json
index 10f68b8..2c9c17d 100644
--- a/Collaborateur_Epa_Back/espacecollab.backend.api/appsettings.json
+++ b/Collaborateur_Epa_Back/espacecollab.backend.api/appsettings.json
@@ -5,5 +5,9 @@
       "Microsoft.AspNetCore": "Warning"
     }
   },
-  "AllowedHosts": "*"
+  "AllowedHosts": "*",
+  "Sql": {
+    "LoadFake": false,
+    "ConnectionString": "Server=localhost;Database=collaborateur_epa;Uid=root;Pwd=root;"
+  }
 }
diff --git a/Collaborateur_Epa_Back/espacecollab.backend.api/espacecollab.backend.api.csproj b/Collaborateur_Epa_Back/espacecollab.backend.api/espacecollab.backend.api.csproj
index 14554a8..19cd919 100644
--- a/Collaborateur_Epa_Back/espacecollab.backend.api/espacecollab.backend.api.csproj
+++ b/Collaborateur_Epa_Back/espacecollab.backend.api/espacecollab.backend.api.csproj
@@ -14,4 +14,8 @@
     <Folder Include="Controllers\" />
   </ItemGroup>
 
+  <ItemGroup>
+    <ProjectReference Include="..\espacecollab.backend.infrastructure.sql\espacecollab.backend.infrastructure.sql.csproj" />
+  </ItemGroup>
+
 </Project>
diff --git a/Collaborateur_Epa_Back/espacecollab.backend.infrastructure.sql.dtos/CollaborateurSqlDto.cs b/Collaborateur_Epa_Back/espacecollab.backend.infrastructure.sql.dtos/CollaborateurSqlDto.cs
index b7917d2..3c84b33 100644
--- a/Collaborateur_Epa_Back/espacecollab.backend.infrastructure.sql.dtos/CollaborateurSqlDto.cs
+++ b/Collaborateur_Epa_Back/espacecollab.backend.infrastructure.sql.dtos/CollaborateurSqlDto.cs
@@ -1,5 +1,4 @@
-using espacecollab.backend.infrastructure.sql.dtos.Enums;
-using System.Diagnostics.CodeAnalysis;
+using System.Diagnostics.CodeAnalysis;
 
 namespace espacecollab.backend.infrastructure.sql.dtos
 {
@@ -18,13 +17,14 @@ namespace espacecollab.backend.infrastructure.sql.dtos
         public string ApsideMail { get; set; }
         public DateTime ResignationDate { get; set; }
         public Guid ReferrerId { get; set; }
+        public Guid BusinessUnitId { get; set; }
 
         [ExcludeFromCodeCoverage]
         private CollaborateurSqlDto()
         {
         }
 
-        public CollaborateurSqlDto(Guid id, string name, string firstName, DateTime birthDate, EnumGenre gender, EnumStatut status, int childrenNumber, string address, string telephone, string personalMail, string apsideMail, DateTime resignationDate, Guid referrerId)
+        public CollaborateurSqlDto(Guid id, string name, string firstName, DateTime birthDate, EnumGenre gender, EnumStatut status, int childrenNumber, string address, string telephone, string personalMail, string apsideMail, DateTime resignationDate, Guid referrerId, Guid businessUnitId)
         {
             Id = id;
             Name = name;
@@ -39,6 +39,7 @@ namespace espacecollab.backend.infrastructure.sql.dtos
             ApsideMail = apsideMail;
             ResignationDate = resignationDate;
             ReferrerId = referrerId;
+            BusinessUnitId = businessUnitId;
         }
     }
 }
diff --git a/Collaborateur_Epa_Back/espacecollab.backend.infrastructure.sql.dtos/EnumGenre.cs b/Collaborateur_Epa_Back/espacecollab.backend.infrastructure.sql.dtos/EnumGenre.cs
index 83c9bef..2170465 100644
--- a/Collaborateur_Epa_Back/espacecollab.backend.infrastructure.sql.dtos/EnumGenre.cs
+++ b/Collaborateur_Epa_Back/espacecollab.backend.infrastructure.sql.dtos/EnumGenre.cs
@@ -1,4 +1,4 @@
-namespace espacecollab.backend.infrastructure.sql.dtos.Enums
+namespace espacecollab.backend.infrastructure.sql.dtos
 {
     public enum EnumGenre
     {
diff --git a/Collaborateur_Epa_Back/espacecollab.backend.infrastructure.sql.dtos/EnumStatut.cs b/Collaborateur_Epa_Back/espacecollab.backend.infrastructure.sql.dtos/EnumStatut.cs
index 2db3de5..1f1d737 100644
--- a/Collaborateur_Epa_Back/espacecollab.backend.infrastructure.sql.dtos/EnumStatut.cs
+++ b/Collaborateur_Epa_Back/espacecollab.backend.infrastructure.sql.dtos/EnumStatut.cs
@@ -1,4 +1,4 @@
-namespace espacecollab.backend.infrastructure.sql.dtos.Enums
+namespace espacecollab.backend.infrastructure.sql.dtos
 {
     public enum EnumStatut
     {
diff --git a/Collaborateur_Epa_Back/espacecollab.backend.infrastructure.sql.dtos/TechnologieSqlDto.cs b/Collaborateur_Epa_Back/espacecollab.backend.infrastructure.sql.dtos/TechnologieSqlDto.cs
index 73f5028..21fa7e5 100644
--- a/Collaborateur_Epa_Back/espacecollab.backend.infrastructure.sql.dtos/TechnologieSqlDto.cs
+++ b/Collaborateur_Epa_Back/espacecollab.backend.infrastructure.sql.dtos/TechnologieSqlDto.cs
@@ -1,4 +1,6 @@
-namespace espacecollab.backend.infrastructure.sql.dtos
+using System.Diagnostics.CodeAnalysis;
+
+namespace espacecollab.backend.infrastructure.sql.dtos
 {
     public class TechnologieSqlDto
     {
diff --git a/Collaborateur_Epa_Back/espacecollab.backend.infrastructure.sql/MainDbContext.cs b/Collaborateur_Epa_Back/espacecollab.backend.infrastructure.sql/MainDbContext.cs
new file mode 100644
index 0000000..2688dd6
--- /dev/null
+++ b/Collaborateur_Epa_Back/espacecollab.backend.infrastructure.sql/MainDbContext.cs
@@ -0,0 +1,24 @@
+using espacecollab.backend.infrastructure.sql.dtos;
+using espacecollab.backend.infrastructure.sql.Options;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.Extensions.Options;
+namespace espacecollab.backend.infrastructure.sql
+{
+    public class MainDbContext : DbContext
+    {
+        private IOptions<SqlOption> SqlSettings { get; }
+
+        public DbSet<CollaborateurSqlDto>? Collaborateur { get; set; }
+
+        public MainDbContext(IOptions<SqlOption> sqlSettings)
+        {
+            SqlSettings = sqlSettings;
+        }
+        protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
+        {
+            optionsBuilder.UseSqlServer(SqlSettings.Value.ConnectionString);
+        }
+
+
+    }
+}
diff --git a/Collaborateur_Epa_Back/espacecollab.backend.infrastructure.sql/Options/SqlOption.cs b/Collaborateur_Epa_Back/espacecollab.backend.infrastructure.sql/Options/SqlOption.cs
new file mode 100644
index 0000000..f741343
--- /dev/null
+++ b/Collaborateur_Epa_Back/espacecollab.backend.infrastructure.sql/Options/SqlOption.cs
@@ -0,0 +1,14 @@
+namespace espacecollab.backend.infrastructure.sql.Options
+{
+    public class SqlOption
+    {
+        public static string Key => "Sql";
+        public bool LoadFake { get; set; }
+        public string ConnectionString { get; set; }
+
+        public SqlOption()
+        {
+            ConnectionString = string.Empty;
+        }
+    }
+}
diff --git a/Collaborateur_Epa_Back/espacecollab.backend.infrastructure.sql/SqlRepo/CollaborateurRepository.cs b/Collaborateur_Epa_Back/espacecollab.backend.infrastructure.sql/SqlRepo/CollaborateurRepository.cs
new file mode 100644
index 0000000..e0161ec
--- /dev/null
+++ b/Collaborateur_Epa_Back/espacecollab.backend.infrastructure.sql/SqlRepo/CollaborateurRepository.cs
@@ -0,0 +1,52 @@
+using espacecollab.backend.infrastructure.sql.dtos;
+using espacecollab.backend.infrastructure.sql.SqlRepo.Interface;
+
+namespace espacecollab.backend.infrastructure.sql.SqlRepo
+{
+    public class CollaborateurRepository : ICollaborateurRepository
+    {
+        private MainDbContext Context { get; }
+
+        public CollaborateurRepository(MainDbContext context)
+        {
+            Context = context;
+        }
+
+        /* TODO Récupération des collaborateurs par agence directement dans le service Collaborateur */
+
+        public CollaborateurSqlDto? AddCollaborateur(CollaborateurSqlDto newCollaborateur)
+        {
+            CollaborateurSqlDto? collaborateurAlreadyExists = Context.Collaborateur?.FirstOrDefault(c => c.Id == newCollaborateur.Id);
+            if (collaborateurAlreadyExists != null)
+                return null;
+            
+            Context.Set<CollaborateurSqlDto>().Add(newCollaborateur);
+            Context.SaveChanges();
+
+            return Context.Set<CollaborateurSqlDto>().FirstOrDefault(c => c.Id == newCollaborateur.Id);
+        }
+
+        public IList<CollaborateurSqlDto>? GetAllCollaborateurs()
+            => Context.Set<CollaborateurSqlDto>().ToList();
+
+        public IList<CollaborateurSqlDto>? GetCollaborateursByBusinessUnit(Guid businessUnitId)
+            => Context.Set<CollaborateurSqlDto>().Where(collaborateur => collaborateur.BusinessUnitId == businessUnitId).ToList();
+
+        public IList<CollaborateurSqlDto>? GetCollaborateursByReferrer(Guid referrerId)
+            => Context.Set<CollaborateurSqlDto>().Where(collaborateur => collaborateur.ReferrerId == referrerId).ToList();
+
+        public CollaborateurSqlDto? GetCollaborateurById(Guid id)
+            => Context?.Set<CollaborateurSqlDto>().SingleOrDefault(collaborateur => collaborateur.Id == id);
+
+        public CollaborateurSqlDto? GetCollaborateurByApsideMail(string apsideMail)
+            => Context?.Set<CollaborateurSqlDto>().SingleOrDefault(collaborateur => collaborateur.ApsideMail == apsideMail);
+
+        public CollaborateurSqlDto? UpdateCollaborateur(CollaborateurSqlDto newCollaborateur)
+        {
+            Context.Set<CollaborateurSqlDto>().Update(newCollaborateur);
+            Context.SaveChanges();
+
+            return Context.Set<CollaborateurSqlDto>().FirstOrDefault(c => c.Id == newCollaborateur.Id);
+        }
+    }
+}
diff --git a/Collaborateur_Epa_Back/espacecollab.backend.infrastructure.sql/SqlRepo/Interface/ICollaborateurRepository.cs b/Collaborateur_Epa_Back/espacecollab.backend.infrastructure.sql/SqlRepo/Interface/ICollaborateurRepository.cs
new file mode 100644
index 0000000..7271a87
--- /dev/null
+++ b/Collaborateur_Epa_Back/espacecollab.backend.infrastructure.sql/SqlRepo/Interface/ICollaborateurRepository.cs
@@ -0,0 +1,15 @@
+using espacecollab.backend.infrastructure.sql.dtos;
+
+namespace espacecollab.backend.infrastructure.sql.SqlRepo.Interface
+{
+    public interface ICollaborateurRepository
+    {
+        CollaborateurSqlDto? AddCollaborateur(CollaborateurSqlDto newCollaborateur);
+        IList<CollaborateurSqlDto>? GetAllCollaborateurs();
+        CollaborateurSqlDto? GetCollaborateurByApsideMail(string apsideMail);
+        CollaborateurSqlDto? GetCollaborateurById(Guid id);
+        IList<CollaborateurSqlDto>? GetCollaborateursByBusinessUnit(Guid businessUnitId);
+        IList<CollaborateurSqlDto>? GetCollaborateursByReferrer(Guid referrerId);
+        CollaborateurSqlDto? UpdateCollaborateur(CollaborateurSqlDto newCollaborateur);
+    }
+}
\ No newline at end of file
diff --git a/Collaborateur_Epa_Back/espacecollab.backend.infrastructure.sql/db/db_1_0_0.sql b/Collaborateur_Epa_Back/espacecollab.backend.infrastructure.sql/db/db_1_0_0.sql
index 344c6bd..5aaeeb4 100644
--- a/Collaborateur_Epa_Back/espacecollab.backend.infrastructure.sql/db/db_1_0_0.sql
+++ b/Collaborateur_Epa_Back/espacecollab.backend.infrastructure.sql/db/db_1_0_0.sql
@@ -69,7 +69,7 @@ CREATE TABLE IF NOT EXISTS Fonction(
 DROP TABLE IF EXISTS Collaborateur;
 CREATE TABLE IF NOT EXISTS Collaborateur(
     Id int NOT NULL AUTO_INCREMENT,
-    Name varchar(100) NOT NULL UNIQUE,
+    Name varchar(100) NOT NULL,
     FirstName varchar(100) NOT NULL,
     BirthDate date NOT NULL,
     Gender ENUM('MASCULIN','FEMININ','AUTRE') NOT NULL,
diff --git a/Collaborateur_Epa_Back/espacecollab.backend.infrastructure.sql/espacecollab.backend.infrastructure.sql.csproj b/Collaborateur_Epa_Back/espacecollab.backend.infrastructure.sql/espacecollab.backend.infrastructure.sql.csproj
index 132c02c..d919b65 100644
--- a/Collaborateur_Epa_Back/espacecollab.backend.infrastructure.sql/espacecollab.backend.infrastructure.sql.csproj
+++ b/Collaborateur_Epa_Back/espacecollab.backend.infrastructure.sql/espacecollab.backend.infrastructure.sql.csproj
@@ -1,4 +1,4 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
 
   <PropertyGroup>
     <TargetFramework>net6.0</TargetFramework>
@@ -6,4 +6,18 @@
     <Nullable>enable</Nullable>
   </PropertyGroup>
 
+  <ItemGroup>
+    <PackageReference Include="Microsoft.EntityFrameworkCore" Version="6.0.0" />
+    <PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer" Version="6.0.0" />
+    <PackageReference Include="Microsoft.EntityFrameworkCore.Tools" Version="6.0.0">
+      <PrivateAssets>all</PrivateAssets>
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+    </PackageReference>
+    <PackageReference Include="MySql.EntityFrameworkCore" Version="5.0.8" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\espacecollab.backend.infrastructure.sql.dtos\espacecollab.backend.infrastructure.sql.dtos.csproj" />
+  </ItemGroup>
+
 </Project>