Refactor data layer, add business layer

DataAccessLayer/IRepository.cs

@@ -6,7 +6,11 @@ namespace DataAccessLayer
     public interface IRepository<T>
         where T : class
     {
+
         void Add(T entity);
+
+        IEnumerable<T> GetAll(int? limit, int? offset);
+        
         T? GetById(Guid id);
         void Update(T entity);
         void Delete(Guid id);

DataAccessLayer/Repositories/IUserAccountRepository.cs

@@ -6,7 +6,6 @@ namespace DataAccessLayer
 {
     public interface IUserAccountRepository : IRepository<UserAccount>
     {
-        IEnumerable<UserAccount> GetAll();
         UserAccount? GetByUsername(string username);
         UserAccount? GetByEmail(string email);
     }

DataAccessLayer/Repositories/UserAccountRepository.cs

@@ -66,14 +66,46 @@ namespace DataAccessLayer
             command.ExecuteNonQuery();
         }
 
-        public IEnumerable<UserAccount> GetAll()
+        public IEnumerable<UserAccount> GetAll(int? limit, int? offset)
         {
+            if (limit.HasValue && limit <= 0)
+            {
+                throw new ArgumentOutOfRangeException(
+                    nameof(limit),
+                    "Limit must be greater than zero."
+                );
+            }
+
+            if (offset < 0)
+            {
+                throw new ArgumentOutOfRangeException(
+                    nameof(offset),
+                    "Offset cannot be negative."
+                );
+            }
+
+            if (offset.HasValue && !limit.HasValue)
+            {
+                throw new ArgumentOutOfRangeException(
+                    nameof(offset),
+                    "Offset cannot be provided without a limit."
+                );
+            }
+
             using SqlConnection connection = new(_connectionString);
             using SqlCommand command = new(
                 "usp_GetAllUserAccounts",
                 connection
             );
             command.CommandType = System.Data.CommandType.StoredProcedure;
+            if (limit.HasValue)
+            {
+                command.Parameters.AddWithValue("@Limit", limit.Value);
+            }
+            if (offset.HasValue)
+            {
+                command.Parameters.AddWithValue("@Offset", offset.Value);
+            }
             connection.Open();
 
             using SqlDataReader reader = command.ExecuteReader();

DataAccessLayer/Sql/crud/UserAccount.sql

@@ -1,187 +0,0 @@
-USE Biergarten;
-GO
-
-CREATE OR ALTER PROCEDURE usp_CreateUserAccount
-(
-    @UserAccountId UNIQUEIDENTIFIER = NULL,
-    @Username VARCHAR(64),
-    @FirstName NVARCHAR(128),
-    @LastName NVARCHAR(128),
-    @DateOfBirth DATETIME,
-    @Email VARCHAR(128)
-)
-AS
-BEGIN
-    SET NOCOUNT ON
-    SET XACT_ABORT ON
-    BEGIN TRANSACTION
-
-    INSERT INTO UserAccount 
-    (
-        UserAccountID,
-        Username,
-        FirstName,
-        LastName,
-        DateOfBirth,
-        Email
-    )
-    VALUES
-    (
-        COALESCE(@UserAccountId, NEWID()),
-        @Username,
-        @FirstName,
-        @LastName,
-        @DateOfBirth,
-        @Email
-    );
-
-
-
-    COMMIT TRANSACTION
-END;
-GO
-
-CREATE OR ALTER PROCEDURE usp_DeleteUserAccount
-(
-    @UserAccountId UNIQUEIDENTIFIER
-)
-AS
-BEGIN
-    SET NOCOUNT ON
-    SET XACT_ABORT ON
-    BEGIN TRANSACTION
-
-    IF NOT EXISTS (SELECT 1 FROM UserAccount WHERE UserAccountId = @UserAccountId)
-    BEGIN
-        RAISERROR('UserAccount with the specified ID does not exist.', 16,
-        1);
-        ROLLBACK TRANSACTION
-        RETURN
-    END
-
-    DELETE FROM UserAccount 
-    WHERE UserAccountId = @UserAccountId;
-    COMMIT TRANSACTION
-END;
-GO
-
-
-CREATE OR ALTER PROCEDURE usp_UpdateUserAccount
-(
-    @Username VARCHAR(64),
-    @FirstName NVARCHAR(128),
-    @LastName NVARCHAR(128),
-    @DateOfBirth DATETIME,
-    @Email VARCHAR(128),
-    @UserAccountId UNIQUEIDENTIFIER
-)
-AS
-BEGIN
-    SET NOCOUNT ON
-    SET XACT_ABORT ON
-    BEGIN TRANSACTION
-
-    IF NOT EXISTS (SELECT 1 FROM UserAccount WHERE UserAccountId = @UserAccountId)
-    BEGIN
-        RAISERROR('UserAccount with the specified ID does not exist.', 16,
-        1);
-        ROLLBACK TRANSACTION
-        RETURN
-    END 
-
-    UPDATE UserAccount
-    SET
-        Username = @Username,
-        FirstName = @FirstName,
-        LastName = @LastName,
-        DateOfBirth = @DateOfBirth,
-        Email = @Email
-    WHERE UserAccountId = @UserAccountId;
-
-    COMMIT TRANSACTION
-END;
-GO
-
-CREATE OR ALTER PROCEDURE usp_GetUserAccountById
-(
-    @UserAccountId UNIQUEIDENTIFIER
-)
-AS
-BEGIN
-    SET NOCOUNT ON;
-
-    SELECT UserAccountID,
-           Username,
-           FirstName,
-           LastName,
-           Email,
-           CreatedAt,
-           UpdatedAt,
-           DateOfBirth,
-           Timer
-    FROM dbo.UserAccount
-    WHERE UserAccountID = @UserAccountId;
-END;
-GO
-
-CREATE OR ALTER PROCEDURE usp_GetAllUserAccounts
-AS
-BEGIN
-    SET NOCOUNT ON;
-
-    SELECT UserAccountID,
-           Username,
-           FirstName,
-           LastName,
-           Email,
-           CreatedAt,
-           UpdatedAt,
-           DateOfBirth,
-           Timer
-    FROM dbo.UserAccount;
-END;
-GO
-
-CREATE OR ALTER PROCEDURE usp_GetUserAccountByUsername
-(
-    @Username VARCHAR(64)
-)
-AS
-BEGIN
-    SET NOCOUNT ON;
-
-    SELECT UserAccountID,
-           Username,
-           FirstName,
-           LastName,
-           Email,
-           CreatedAt,
-           UpdatedAt,
-           DateOfBirth,
-           Timer
-    FROM dbo.UserAccount
-    WHERE Username = @Username;
-END;
-GO
-
-CREATE OR ALTER PROCEDURE usp_GetUserAccountByEmail
-(
-    @Email VARCHAR(128)
-)
-AS
-BEGIN
-    SET NOCOUNT ON;
-
-    SELECT UserAccountID,
-           Username,
-           FirstName,
-           LastName,
-           Email,
-           CreatedAt,
-           UpdatedAt,
-           DateOfBirth,
-           Timer
-    FROM dbo.UserAccount
-    WHERE Email = @Email;
-END;
-GO