Sqlite Bank does not work on Unity Games compiled for Android

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Sqlite Bank does not work on Unity Games compiled for Android

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#1 by (2 votes)
#2 by (0 votes)

2

I'm using Sqlite as a database for a Unity game that works perfectly in < Unity Editor , but when I build for Android the game simply does not access the database (nothing is informed or released).

What can I do to make the sqlite database accessible via Android as well as the Unity Editor?

Programs / Versions used:
- Unity 5.3.1f1
-Sqlite Precompiled Binaries for Windows 64 (sqlite-dll-win64-x64-3100200.zip (688.01 KiB))

Folder Structure:

-- Assets/Database/MyDataBase.db
-- Assets/Scripts/PerguntaScript.cs
-- Assets/Plugins/Mono.Data.Sqlite.dll
-- Assets/Plugins/sqlite3.def
-- Assets/Plugins/sqlite3.dll
-- Assets/Plugins/System.Data.dll

QuestionScript.cs (Script that accesses the Sqlite database)

using UnityEngine;
using UnityEngine.UI;
using System.Collections;
using System;
using System.Data;
using Mono.Data.Sqlite;

public class PerguntaScript : MonoBehaviour {

    private string connectionString;

    void Start () {
        connectionString = "URI=file:" + Application.dataPath + "/Database/DoencasDB.db";
    }

    private void GetPergunta(){
        using(IDbConnection dbConnection = new SqliteConnection(connectionString)){
            dbConnection.Open();

            using(IDbCommand dbCommand = dbConnection.CreateCommand()){
                string sqlQuery = "SELECT * FROM " + sqliteTabelasPerguntas[sqliteIndexTabelaPergunta] + " WHERE doenca_id=@id LIMIT 1";
                dbCommand.Parameters.Add(new SqliteParameter("@id", doencaId));
                dbCommand.CommandText = sqlQuery;

                using(IDataReader reader = dbCommand.ExecuteReader()){
                    while(reader.Read()){
                        pergunta = reader.GetString(1);
                        alternativasId[0] = reader.GetInt32(3);
                        alternativasId[1] = reader.GetInt32(4);
                        alternativasId[2] = reader.GetInt32(5);
                        alternativasId[3] = reader.GetInt32(6);
                        alternativaCorretaId = reader.GetInt32(7);
                    }
                    dbConnection.Close();
                    reader.Close();
                }
            }
        }
    }

OBS: Tested on Android: 4.4 and 5.0

android sqlite unity3d

asked by anonymous 30.01.2016 / 20:57

2 answers

0

You need to add the SQLite connection libraries to your project, the file I believe is not currently available on the official SQLite website (but you find it easily there), it is a file with the extension .so .

You should add it in / Assets / Plugins / Android

Unlike many libraries we use as .dll , Android uses .so .

Source: Unity Documentation .

Here in the SOen a problem identical to your.

30.01.2016 / 21:37

a message appears when the connection drops Data ordering: Bubble sort or Collections sort method

score 2 · Accepted Answer

To make it work outside of the editing environment (in this case in the mobile environment) I had to make the following changes:

1) check what environment I am (through compile comments I determine which code will go to the compiled).

2) check if the file has already been opened and stored by the application (uncompressed from the jar (check the unity documentation)) if it is not necessary to open the database and store it on the local adequate (expressed by: Application.persistentDataPath )

public void GenerateConnectionString(string DatabaseName)
{
    #if UNITY_EDITOR
        string dbPath = Application.dataPath + "/StreamingAssets/" + DatabaseName;
    #else
        //check if file exists in Application.persistentDataPath
        string filepath = Application.persistentDataPath + "/" + DatabaseName;

        if (!File.Exists(filepath) || new System.IO.FileInfo(filepath).Length == 0)
        {
            // if it doesn't ->
            // open StreamingAssets directory and load the db ->
            #if UNITY_ANDROID
                WWW loadDb = new WWW("jar:file://" + Application.dataPath + "!/assets/" + DatabaseName);  // this is the path to your StreamingAssets in android
                while (!loadDb.isDone) { }  // CAREFUL here, for safety reasons you shouldn't let this while loop unattended, place a timer and error check
                // then save to Application.persistentDataPath
                File.WriteAllBytes(filepath, loadDb.bytes);
            #elif UNITY_IOS
                var loadDb = Application.dataPath + "/Raw/" + DatabaseName;  // this is the path to your StreamingAssets in iOS
                // then save to Application.persistentDataPath
                File.Copy(loadDb, filepath);
            #elif UNITY_WP8
                var loadDb = Application.dataPath + "/StreamingAssets/" + DatabaseName;  // this is the path to your StreamingAssets in iOS
                // then save to Application.persistentDataPath
                File.Copy(loadDb, filepath);
            #elif UNITY_WINRT
                var loadDb = Application.dataPath + "/StreamingAssets/" + DatabaseName;  // this is the path to your StreamingAssets in iOS
                // then save to Application.persistentDataPath
                File.Copy(loadDb, filepath);
            #endif
        }
        var dbPath = filepath;
    #endif
    connectionString = "URI=file:" + dbPath;
}