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Question by lrpsantiago · Oct 22, 2015 at 08:24 AM · androiddatabasesqlite

SQLite Transaction Update Problem on Android

This is very specific. I've been using SQLite for an Android game, and everything was working well until I start to use transactions. For some reason, when I try to update a table, using a transaction, the application throws an exception: "sql logic error or missing database". But this happens only on an android device, on the PC it works well. I couldn't find an answer for this. I did a workaround by deleting the rows to be updated and then re-inserting with the new values, but I don't feel confortable doing this because it's not the best practice. Just to be sure, I did a simple class to test this problem:

 using Mono.Data.SqliteClient;
 using System;
 using System.Data;
 
 namespace MyGame
 {
     internal class TestDAO
     {
         private DataAccess m_dataAccess;
 
         public TestDAO()
         {
             m_dataAccess = DataAccess.Instance;
         }
 
         public void Insert()
         {
             IDbCommand command = m_dataAccess.Connection.CreateCommand();
             
             command.CommandText = "INSERT INTO test " +
                                   "VALUES(@id, 0);";
 
             IDbTransaction transaction = null; 
 
             try
             {
                 m_dataAccess.Connection.Open();
                 transaction = m_dataAccess.Connection.BeginTransaction();
                 
                 command.Transaction = transaction;
 
                 for ( int i = 0; i < 1000; i++ )
                 {
                     command.Parameters.Clear();
                     command.Parameters.Add(new SqliteParameter("@id", i));
                     command.ExecuteNonQuery();
                 }
 
                 transaction.Commit();
             }
             catch ( Exception e )
             {
                 transaction.Rollback();
                 throw e;
             }
             finally
             {
                 m_dataAccess.Connection.Close();
             }
         }
 
         public void Update()
         {
             IDbCommand command = m_dataAccess.Connection.CreateCommand();
 
             command.CommandText = "UPDATE test " +
                                   "SET number = @number " +
                                   "WHERE id = @id;";
 
             IDbTransaction transaction = null;
 
             try
             {
                 m_dataAccess.Connection.Open();
                 transaction = m_dataAccess.Connection.BeginTransaction();
 
                 command.Transaction = transaction;
 
                 for ( int i = 0; i < 1000; i++ )
                 {
                     command.Parameters.Clear();
                     command.Parameters.Add(new SqliteParameter("@id", i));
                     command.Parameters.Add(new SqliteParameter("@number", i + 1));
                     command.ExecuteNonQuery();
                 }
 
                 transaction.Commit();
             }
             catch ( Exception e )
             {
                 transaction.Rollback();
                 throw e;
             }
             finally
             {
                 m_dataAccess.Connection.Close();
             }
         }
     }
 }
 

I've created a table "test" with the fields: "id" and "number", both integer, where id is the primary key. So, I run Insert() and then Update() in my game, and I got the same error on Android, but it works fine on PC. I don't know what is the problem, but seems to be something about permissions or compatibility. Does anyone know a good solution for this? (I mean: using UPDATE instead of DELETE / INSERT)

P.S.: DataAccess is just a singleton class where I encapsulate my database connection, the "Connection" property returns an instance of "IDbConnection", used on the entire application. And, for now, I don't use multithreaded database connections.

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