public static Category AddCategory(Category category)
{
string sql =
"INSERT Categories (Name)" +
"VALUES (@Name)";
sql += " ; SELECT @@IDENTITY";
try
{
SqlParameter[] para = new SqlParameter[]
{
new SqlParameter("@Name", category.Name)
};
int newId = DBHelper.GetScalar(sql, para);
return GetCategoryById(newId);
}
catch (Exception e)
{
Console.WriteLine(e.Message);
return null;
}
}
public static Category GetCategoryById(int id)
{
string sql = "SELECT * FROM Categories WHERE Id = @Id";
try
{
SqlDataReader reader = DBHelper.GetReader(sql, new SqlParameter("@Id", id));
if (reader.Read())
{
Category category = new Category();
category.Id = (int)reader["Id"];
category.Name = (string)reader["Name"];
reader.Close();
return category;
}
else
{
reader.Close();
return null;
}
}
catch (Exception e)
{
Console.WriteLine(e.Message);
throw e;
}
}
public static void DeleteCategory(Category category)
{
DeleteCategoryById( category.Id );
}
private static IList<Category> GetCategoriesBySql( string sql, params SqlParameter[] values )
{
List<Category> list = new List<Category>();
try
{
DataTable table = DBHelper.GetDataSet( sql, values );
foreach (DataRow row in table.Rows)
{
Category category = new Category();
category.Id = (int)row["Id"];
category.Name = (string)row["Name"];
list.Add(category);
}
return list;
}
catch (Exception e)
{
Console.WriteLine(e.Message);
return null;
}
}
public static void ModifyCategory(Category category)
{
string sql =
"UPDATE Categories " +
"SET " +
"Name = @Name " +
"WHERE Id = @Id";
try
{
SqlParameter[] para = new SqlParameter[]
{
new SqlParameter("@Id", category.Id),
new SqlParameter("@Name", category.Name)
};
DBHelper.ExecuteCommand(sql, para);
}
catch (Exception e)
{
Console.WriteLine(e.Message);
throw e;
}
}
public static void ModifyCategory(Category category)
{
CategoryService.ModifyCategory(category);
}
public static void DeleteCategory(Category category)
{
CategoryService.DeleteCategory(category);
}
public static Category AddCategory(Category category)
{
return CategoryService.AddCategory(category);
}
