SQLite-net-pcl - Always returning ID as 0 (Xamarin)

Question

I recently moved across from SQLite.NET to SQLite-net-pcl due to the Android 7.0 SQlite issue.

In the process I have updated all my libraries and all is working well with regards to insert/drop etc.

The only issue I have is that every time I retrieve an item from the DB it always has an ID of 0. This is causing problems with updating items. Has anyone had this issue before?

 [SQLite.PrimaryKey, SQLite.AutoIncrement]
    public int ID { get; set; }
    public string objectId { get; set; }
    public DateTime createdAt { get; set; }
    public DateTime updatedAt { get; set; }
    public string Title { get; set; }

Thanks in advance.

Make sure that you're not using `InsertOrReplace` with an `AutoIncrement` primary key. It will always override item with id 0 and never insert a new one. — redent84, Jan 20 '17 at 11:12
In addition, I think that SQLite-Net namespace is `SQLite.Net`, in your sample you're using `SQLite`, maybe your primary key attribute is not being recognized. — redent84, Jan 20 '17 at 11:14
Also make your `ID` nullable; `public int? ID { get; set; }` — SushiHangover, Jan 20 '17 at 11:17
Thanks for the answers guys but none of these seem to be working. I seem to have a very strange issue. Definitely Xamarin related. I cant build and run the app in debug and release. All works perfectly. When I package my app I have either 1 of 3 scenarios. 1. App crashes on launch, 2. App works but doesn't pull all data, next load crashes, wipe the data for that app and works perfect. 3. Doesn't install. — Phill Wiggins, Jan 21 '17 at 09:57
Probably your table has different column name, not "id" but smth else? If this is the case - you can specify Attribute `[Column("")]` — Leopik, Oct 26 '19 at 11:19

score 5 · Answer 1 · answered Sep 28 '17 at 16:49

5

Please try using this, this worked for me

using SQLite.Net.Attributes;

  [PrimaryKey, AutoIncrement]
    public int? Id { get; set; }

answered Sep 28 '17 at 16:49

user8122933

51
1
2

score 2 · Answer 2 · answered Aug 09 '17 at 09:53

Had almost the same situation. with all rows returning id of 0

class ToDo : Java.Lang.Object
{
    [PrimaryKey, AutoIncrement]
    public int ID { get; }

except I simply had forgotten to type set; in the property.

one thing that might help someone with this sorta problem is using the GetMapping() method to get some info on the mapping used when CreateTable() is used to create the table. as example:

        Toast.MakeText(this, db.GetMapping<ToDo>().TableName.ToString(), ToastLength.Long).Show();
        Toast.MakeText(this, db.GetMapping<ToDo>().HasAutoIncPK.ToString(), ToastLength.Long).Show();

using this I found out that AutoIncrement (HasAutoIncPK = false) wasn't being set on my table.

score 0 · Answer 3 · answered Jul 18 '17 at 04:33

See if you created the table with the methods CreateComand(query) and ExecuteNonQuery(). If this is the case, create your table with the CreateTable<Type>() method. The primary key and autoincrement attributes are initialized at the time of creating the table through said method

Bijington · Answer 4 · 2018-02-07T13:39:18.943

0

I have been struggling with the same issue here.

I was manually creating the tables to guarantee a smoother update process moving forwards rather than using the CreateTable methods available.

The fix that I eventually stumbled upon was that I was using the wrong data type for my PRIMARY KEY column.

Wrong definition

[RecordIndexId] int PRIMARY KEY NOT NULL

Correct definition

[RecordIndexId] integer PRIMARY KEY NOT NULL

To add a little context there is a big different between the int and integer data types. Explained in this SO answer

edited Feb 07 '18 at 13:39

answered Feb 07 '18 at 13:19

Bijington

3,661
5
35
52

Could you explain how to express that in terms of Xamarin? – Alexander Gorg Mar 12 '20 at 09:49
@AlexanderGorg I am not sure I understand what you are looking for. The issue I mentioned relates to the database table that you create in SQLite. – Bijington Mar 12 '20 at 18:07

score -1 · Answer 5 · answered Nov 18 '19 at 21:35

-1

My problem was that I had an internal set for my ID property setter. This had to be public to work correctly.

I'd add this as a comment but alas... I don't have enough rep.

answered Nov 18 '19 at 21:35

Michael Manley

131
1
6

SQLite-net-pcl - Always returning ID as 0 (Xamarin)

5 Answers5