how can I return image from my Postgresql Database. and should I render it as image? I'm using .Net Core web api

Question

I'm creating a web API Rest service as micro-service using .Net Core Web API, to upload images to PostgreSQL Database. and I want to create a get action to return the image by ID I really dont know how so please any help will be good, at least I need some guides please.

Here is my class

     namespace Upload_images_API.Models
     {
       public class Image
       {
             public int ImageId { get; set; }
             public byte[] ImageData { get; set; }


      }
    }

and here is my controller to post the image.

public class ImageController : ControllerBase
{
    private readonly ImageDbContext _context;
    public ImageController(ImageDbContext context)
    {
        _context = context;
    }
    [HttpPost("api/Image/upload")]
    public async Task<IActionResult> UploadImage(Image images, List<IFormFile> ImageData)
    {

        if (!ModelState.IsValid)
            {
                return BadRequest(ModelState);
            }

        foreach (var item in ImageData)
        {

            if (item.Length > 0)
            {
                using (var stream = new MemoryStream())
                {
                   await item.CopyToAsync(stream);
                    images.ImageData = stream.ToArray();
                }
            }
        }

        if (images.ImageData == null)
        {
            return BadRequest("Image should be selected.");
        }

        _context.Image.Add(images);
        _context.SaveChanges();

        int imageid = images.ImageId;

        return Ok("Image ID:" + imageid);
    }

please, any help would be appreciated, and thanks so much.

Answer 1

You can create a table with a column of bytea type. In your model you can store the data in a byte[] field.

I'm using dapper framework to read and write in the database:

    public static bool savePhoto(PhotoModel input, IDbConnection connection)
    {

        string sql = "insert into photo(id, photo, notes) VALUES (@Id, @photo, @notes)";
        int res = connection.Execute(sql,new { Id = input.Id, photo = input.photo, notes = input.notes});

        if (res == 1)
        {
            return true;
        } else
        {
            return false;
        }

    }


    public static List<PhotoModel> readPhotosById(Int64 id)
    {
        using (IDbConnection connection = DBConnection.ConnectionFactory())
        {
            string sql = "select id, photo, notes from photo where id = @idPhoto";
            connection.Open();
            List<PhotoModel> photos = connection.Query<PhotoModel>(sql, new { idPhoto = id }).AsList<PhotoModel>();

            return photos;
        }
    }