problem retrieving data from SQLite to Android

Hi everybody!!, this is my first post,

Im working on a University project: Augmented reality app for guidance inside Museum rooms,

Im using Vuforia SDK + Unity3D(3.5.5) indie + SQLite database

I used:[http://wiki.unity3d.com/index.php?title=SQLite][1]

I could make it work on Unity indie Android! I made a edited C# version of both dbAccess.js and ScriptThatUsesTheDatabase.js

I CAN retrieve data using ReadFullTable(string tableName) from dbAccess.cs through ScriptuseDB.cs but I CANT retrieve data using SingleSelectWhere( ) - dont know why(this is the problem).

when i touch the GUI.Button("Titulo") it is supposed to call dbAccess.SingleSelectWhere() BUT nothing shows up and all three buttons disappear and ScrollView...What can I do?, here's the code:

ScriptuseDB.cs:

 using UnityEngine;
 using System.Collections;
 
 public class ScriptUsaDB : MonoBehaviour {
 public string DatabaseName = "TestDB.sqdb";
 public string TableName = "TestTable";
 
     DBAccess db    = new DBAccess();
 
     void Start () {
         db.OpenDB (DatabaseName);
     }
     
     // Update is called once per frame
     void Update () {
     
     }
     
     //var databaseData : ArrayList = new ArrayList();
     ArrayList databaseData = new ArrayList();
     Vector2 scrollPosition;
     int DatabaseEntryStringWidth = 100;
     
     void OnGUI(){    
     GUI.Box(new Rect (25,25,Screen.width - 50, Screen.height - 50),""); 
     GUILayout.BeginArea(new Rect(50, 50, Screen.width - 100, Screen.height - 100));    
         GUILayout.BeginHorizontal();
             if (GUILayout.Button ("Leer BD"))//here all OK, it shows all data from table     
                 databaseData = ReadFullTable();
             if (GUILayout.Button("Limpiar"))
                 databaseData.Clear();
             if (GUILayout.Button("Titulo"))//when I touched this ALL GUI.Layout disappear!(the GUI.Box remains though)
                 databaseData = SingleSelect();
         GUILayout.EndHorizontal();
         
         GUILayout.Label("Contenidos de la tabla de prueba");
         
         scrollPosition = GUILayout.BeginScrollView(scrollPosition, GUILayout.Height(400));
             //foreach (string day in week)
             foreach (ArrayList line  in databaseData){
                     GUILayout.BeginHorizontal();
                     foreach(var s in line){
                         GUILayout.Label(s.ToString(), GUILayout.Width(DatabaseEntryStringWidth));
                     }
                     GUILayout.EndHorizontal();
             }
          GUILayout.EndScrollView();
         
         
     GUILayout.EndArea();
     }
     
     ArrayList ReadFullTable(){
     return db.ReadFullTable(TableName);    
     }
     
     ArrayList SingleSelect(){
     return db.SingleSelectWhere(TableName,"Titulo","Cultura","=","'Chavin'");//CAMBIO1: agregamos ' ' para el string luego del =
         //ORDER BY ProductName DESC;
     }
     
 }

Here is dbAccess function:

 public ArrayList SingleSelectWhere(string tableName, string itemToSelect, string wCol, string wPar, string wValue){ // Selects a single Item
 string query;
 query = "SELECT " + itemToSelect + " FROM " + tableName;// + " WHERE " + wCol + wPar + wValue;CAMBIO: limitamos el query para pruebas
 dbcmd = dbcon.CreateCommand();
 dbcmd.CommandText = query; 
 reader = dbcmd.ExecuteReader();
 var readArray = new ArrayList();//CAMBIO2: Cambiamos Arraylist por var de acuerdo a ReadFullTable
 while(reader.Read()){ 
 readArray.Add(reader.GetString(0)); // Llenamos el arreglo con los datos //CAMBIO1:probamos cambiar reader.GetString(0) por .GetValue(0).
 }
 return readArray; // devuelve los datos
 }

I tried to solve this but I cant, PLEASE any help? Thank You, [1]: http://wiki.unity3d.com/index.php?title=SQLite