C#

Exoskeletor wrote:

which blob? i don't use blobs any more

[Table("TemplateImages")]
public class TemplateImage
{
    [PrimaryKey, AutoIncrement]
    public int Id { get; set; }
    public int Category { get; set; }
    public stream Image { get; set; } // why was that an int? Numbers aren't images
    public string ImageHash { get; set; }
    [ForeignKey(typeof(Template))]
    public int TemplateId { get; set; }
}

Bastard Programmer from Hell
If you can't read my code, try converting it here[^]
"If you just follow the bacon Eddy, wherever it leads you, then you won't have to think about politics." -- Some Bell.

ResourceId 

Exoskeletor wrote:

2) convert them with +s from all the images to one string,

Exoskeletor wrote:

i think i have to read the images as files, and in order to do that i have to open a stream, this sounds very heavy to me

Bastard Programmer from Hell
If you can't read my code, try converting it here[^]
"If you just follow the bacon Eddy, wherever it leads you, then you won't have to think about politics." -- Some Bell.

Exoskeletor wrote:

one hash for each image?

Bastard Programmer from Hell
If you can't read my code, try converting it here[^]
"If you just follow the bacon Eddy, wherever it leads you, then you won't have to think about politics." -- Some Bell.

public static byte[] ConcatByteArrays(params byte[][]  arrays)
{
    return arrays.SelectMany(x => x).ToArray();
}

static class DatabaseHelper
    {
        public static string GetMD5Hash(string content)
        {
            using (var md5 = MD5.Create())
            {
                byte[] computedHash = md5.ComputeHash(Encoding.UTF8.GetBytes(content));
                return new System.Runtime.Remoting.Metadata.W3cXsd2001.SoapHexBinary(computedHash).ToString();
            }
        }

        public static string GetMD5Hash(byte[] content)
        {
            using (var md5 = MD5.Create())
            {
                byte[] computedHash = md5.ComputeHash(Encoding.UTF8.GetBytes(BitConverter.ToString(content).Replace("-", "")));
                return new System.Runtime.Remoting.Metadata.W3cXsd2001.SoapHexBinary(computedHash).ToString();
            }
        }
        public static string DrawableToMD5(int drawableId)
        {
            var templateDB = new TemplateDB();
            return GetMD5Hash(templateDB.DrawableToByteArray(drawableId));
        }
        private static SQLiteConnection instance;
        public static SQLiteConnection db()
        {
            if (instance == null)
                instance = new SQLiteConnection(System.IO.Path.Combine(System.Environment.GetFolderPath(System.Environment.SpecialFolder.Personal), "TemplatesData.db"));

            return instance;
        }
        public static void CloseConnection()
        {
            if (instance != null)
            {
                instance.Close();
                instance.Dispose();
                instance = null;
            }
        }

    }
    public class TemplateDB
    {
        public enum TemplateCategories
        {
            Emojis,
            Stars,
            Hearts,
            Characters,
            Emotions,
        }

        public static byte[] ConcatByteArrays(params byte[][] arrays)
        {
            return arrays.SelectMany(x => x).ToArray();
        }

        public static byte[] ConcatByteList(List<byte[]> list)
        {
            return list
                .SelectMany(a => a)
                .ToArray();
        }

        public static Bitmap GetBitmapFromVectorDrawable(Context context, int drawableId)
        {
            Drawable drawable = ContextCompat.GetDrawable(context, drawableId);
            if (Build.VERSION.SdkInt < Android.OS.BuildVersionCodes.Lollipop)
            {
                drawable = (DrawableCompat.Wrap(drawable)).Mutate();
            }

            Bitmap bitmap = Bitmap.CreateBitmap(drawable.IntrinsicWidth,
                    drawable.IntrinsicWidth, Bitmap.Config.Argb8888);
            Canvas canvas = new Canvas(bitmap);
            drawable.SetBounds(0, 0, canvas.Width, canvas.Height);
            drawable.Draw(canvas);

            return bitmap;
        }

        public byte[] DrawableToByteArray(int resourceId)
        {
            var context = AppState.ApplicationState;
            using (var bitmap = GetBitmapFromVectorDrawable(context, resourceId))
            {
                int size = bitmap.ByteCount;
                byte[] byteArray = new byte[size];
                ByteBuffer byteBuffer = ByteBuffer.Allocate(size);
                bitmap.CopyPixelsToBuffer(byteBuffer);
                byteBuffer.Rewind();
                byteBuffer.Get(byteArray);
                return byteArray;
            }
        }
        public static void AddTemplate(int category, List<int> images)
        {
            var templateDB = new TemplateDB();
            var imageByteList = new List<byte[]>();

            foreach (int image in images)
            {
                imageByteList.Add(templateDB.DrawableToByteArray(image));
            }
            var tmpl = new Template()
            {
                Category = category,
            };
            var img1 = new TemplateImage()
            {
                Category = category,
                Image = images[0],
                ImagesHash = DatabaseHelper.GetMD5Hash(imageByteList[0]),
            };
            var img2 = new TemplateImage()
            {
                Category = category,
                Image = images[1],
                ImagesHash = DatabaseHelper.GetMD5Hash(imageByteList[1]),
            };
            var img3 = new TemplateImage()
            {
                Category = category,
                Image = images[2],
                ImagesHash = DatabaseHelper.GetMD5Hash(imageByteList[2]),
            };
            var img4 = new TemplateImage()
            {
                Category = category,
                Image = images[3],
                ImagesHash = DatabaseHelper.GetMD5Hash(imageByteList[3]),
            };
            var img5 = new TemplateImage()
            {
                Category = category,
                Image = images[4],
                ImagesHash = DatabaseHelper.GetMD5Hash(imageByteList[4]),
            };
            tmpl.TemplateImages = new List<TemplateImage>() { img1, img2, img3, img4, img5 };
            tmpl.ImagesHash = DatabaseHelper.GetMD5Hash(ConcatByteList(imageByteList));
            var result = DatabaseHelper.db().Query<TemplateImage>("Select * from Templates where ImagesHash=?", tmpl.ImagesHash);
            if (result.Count == 0)
            {
            DatabaseHelper.db().InsertAll(tmpl.TemplateImages);
            DatabaseHelper.db().Insert(tmpl);
            DatabaseHelper.db().UpdateWithChildren(tmpl);
            }
            //var some = new List<Template>();
            //some = db.Table<Template>().Where(record => record.Images == images).ToList();
            //var alreadyExist = db.Query<Templates>("select * from Templates where Images = ?", images);
            //var notFound = alreadyExist.ToList();
            //if (some?.Count() == 0)
            //{
            // var template = new Template()
            //{
            //    Category = category,
            //    Images = images,
            //};
            //db.InsertWithChildren(template, recursive: true);
            // }
        }

Exoskeletor wrote:

What if i just give my own unique hash in every template manually? i cant think of another solution, either way im creating a list of templates before inserting them to db, why not just give them my own hash?

Bastard Programmer from Hell
If you can't read my code, try converting it here[^]
"If you just follow the bacon Eddy, wherever it leads you, then you won't have to think about politics." -- Some Bell.

Bitmap bitmap1 = (get bitmap from somewhere)
string hashedImage = MakeMD5(bitmap1);
Bitmap compareTo = (get bitmap you want to compare to)
string compareToHash = MakeMD5(compareTo);
bool imagesAreEqual = (hashedImage == compareToHash);

Bastard Programmer from Hell
If you can't read my code, try converting it here[^]
"If you just follow the bacon Eddy, wherever it leads you, then you won't have to think about politics." -- Some Bell.

Exoskeletor wrote:

I just want to insert a template in the database only if does not exist.

Bastard Programmer from Hell
If you can't read my code, try converting it here[^]
"If you just follow the bacon Eddy, wherever it leads you, then you won't have to think about politics." -- Some Bell.

[Table("Templates")]
    public class Template
    {
        [PrimaryKey, AutoIncrement]
        public int Id { get; set; }
        public int Category { get; set; }
        //[TextBlob("imagesBlobbed")]
        [OneToMany, Unique]
        public List<TemplateImage> TemplateImages { get; set; }
        public string ImagesHash { get; set; }
        //public string imagesBlobbed { get; set; }
    }
    [Table("TemplateImages")]
    public class TemplateImage
    {
        [PrimaryKey, AutoIncrement]
        public int Id { get; set; }
        public int Category { get; set; }
        public string ImagesHash { get; set; }
        public int Image { get; set; }
        [ForeignKey(typeof(Template))]
        public int TemplateId { get; set; }
    }

public static void AddTemplate(int category, List<int> images)
        {
            var templateDB = new TemplateDB();
            var imageByteList = new List<byte[]>();

            foreach (int image in images)
            {
                //imageByteList.Add(templateDB.DrawableToByteArray(image));
            }
            var tmpl = new Template()
            {
                Category = category,
            };
            var img1 = new TemplateImage()
            {
                Category = category,
                Image = images[0],
                //ImagesHash = DatabaseHelper.GetMD5Hash(imageByteList[0]),
            };
            var img2 = new TemplateImage()
            {
                Category = category,
                Image = images[1],
                //ImagesHash = DatabaseHelper.GetMD5Hash(imageByteList[1]),
            };
            var img3 = new TemplateImage()
            {
                Category = category,
                Image = images[2],
                //ImagesHash = DatabaseHelper.GetMD5Hash(imageByteList[2]),
            };
            var img4 = new TemplateImage()
            {
                Category = category,
                Image = images[3],
                //ImagesHash = DatabaseHelper.GetMD5Hash(imageByteList[3]),
            };
            var img5 = new TemplateImage()
            {
                Category = category,
                Image = images[4],
                //ImagesHash = DatabaseHelper.GetMD5Hash(imageByteList[4]),
            };
            tmpl.TemplateImages = new List<TemplateImage>() { img1, img2, img3, img4, img5 };
            //tmpl.ImagesHash = DatabaseHelper.GetMD5Hash(ConcatByteList(imageByteList));
            var result = DatabaseHelper.db().Query<TemplateImage>("Select * from Templates where ImagesHash=?", tmpl.ImagesHash);
            if (result.Count == 0)
            {
            DatabaseHelper.db().InsertAll(tmpl.TemplateImages);
            DatabaseHelper.db().Insert(tmpl);
            DatabaseHelper.db().UpdateWithChildren(tmpl);
            }

[Table("Templates")]
    public class Template
    {
        [PrimaryKey, AutoIncrement]
        public int Id { get; set; }
        public int Category { get; set; }
        //[TextBlob("imagesBlobbed")]
        [OneToMany, Unique]
        public List<TemplateImage> TemplateImages { get; set; }
        public string ImagesHash { get; set; }
        //public string imagesBlobbed { get; set; }
    }
    [Table("TemplateImages")]
    public class TemplateImage
    {
        [PrimaryKey, AutoIncrement]
        public int Id { get; set; }
        public int Category { get; set; }
        public string ImagesHash { get; set; }
        public int Image { get; set; }
        [ForeignKey(typeof(Template))]
        public int TemplateId { get; set; }
    }

Exoskeletor wrote:

i dont like the idea of checking if the table exist,

Exoskeletor wrote:

what if only the half data have been created and after that the app crash? what is the proper way to verify and create data in a database?

Bastard Programmer from Hell
If you can't read my code, try converting it here[^]
"If you just follow the bacon Eddy, wherever it leads you, then you won't have to think about politics." -- Some Bell.

Exoskeletor wrote:

so if i have a template with id 5, and i delete it one day, the template that belong to id 6 wll go to the position of id 5? and so on?

Bastard Programmer from Hell
If you can't read my code, try converting it here[^]
"If you just follow the bacon Eddy, wherever it leads you, then you won't have to think about politics." -- Some Bell.