Android用のUnityプロジェクトでSQLiteが動作しない

Question

問題：以下はすべてUnity Editorでうまく動作しますが、Android用にビルドするとデータベース接続は完了せず、例外メッセージに「sqlite3」と表示されます。

詳細：

私が使用しているプラ​​グインはAsset Storeの上で発見された（SQLiter ）

The database isn't created automatically when the connection 

is created and when I trid debug through asking if the file 

exists on a certain path, the file doesn't exist. This "Path" 

is the the Database location (URI). 

私は他の人にURIを試してみましたが、機能したことがありません...

"URI=file:" + Application.persistentDataPath + "/StreamingAssets/" + SQL_DB_NAME + ".db"; 

"URI=file:" + Application.persistentDataPath + "!/assets/" + SQL_DB_NAME + ".db"; 

"URI=file:" + Application.persistentDataPath + "/" + SQL_DB_NAME + ".db"; 

"URI=file:" + Application.persistentDataPath + "/StreamingAssets/" + SQL_DB_NAME + ".db"; 

"URI=file:" + SQL_DB_NAME + ".db"; 

...

using UnityEngine; 
using UnityEngine.UI; 
using System.Data; 
using System; 
using Mono.Data.SqliteClient; 
using System.IO; 
using System.Text; 

namespace SQLiter 
{ 
    public class DB : MonoBehaviour 
    { 
     public static DB Instance = null; 
     public bool DebugMode = false; 
     public Text debug, debug2; 

     private static string _sqlDBLocation = ""; 
     private const string SQL_DB_NAME = "TestDB"; 
     private const string SQL_TABLE_NAME = "Things"; 

     private const string COL_NAME = "name"; 
     private const string COL_DESCRIPTION = "description"; 

     private IDbConnection _connection = null; 
     private IDbCommand _command = null; 
     private IDataReader _reader = null; 
     private string _sqlString; 

     public bool _createNewTable = false; 

     void Awake() 
     { 
      if (DebugMode) 
       Debug.Log("--- Awake ---"); 
      _sqlDBLocation = "URI=file:" + Application.persistentDataPath + "!/assets/" + SQL_DB_NAME + ".db"; 

      Debug.Log(_sqlDBLocation); 
      Instance = this; 
      SQLiteInit(); 
     } 


     void Start() 
     { 
      if (DebugMode) 
       Debug.Log("--- Start ---"); 
     // Invoke("Test", 3); 
     } 

     private void SQLiteInit() 
     { 

      Debug.Log("SQLiter - Opening SQLite Connection at " + _sqlDBLocation); 
      _connection = new SqliteConnection(_sqlDBLocation); 

      _command = _connection.CreateCommand(); 
      debug.text = File.Exists(_sqlDBLocation).ToString(); 
      try { 
      _connection.Open(); 
      } catch (System.Exception e) { 
      // debug.text = e.Message; 
      } 

      _command.CommandText = "PRAGMA journal_mode = WAL;"; 
      _command.ExecuteNonQuery(); 

      _command.CommandText = "PRAGMA journal_mode"; 
      _reader = _command.ExecuteReader(); 
      if (DebugMode && _reader.Read()) 
       Debug.Log("SQLiter - WAL value is: " + _reader.GetString(0)); 
      _reader.Close(); 

      _command.CommandText = "PRAGMA synchronous = OFF"; 
      _command.ExecuteNonQuery(); 

      _command.CommandText = "PRAGMA synchronous"; 
      _reader = _command.ExecuteReader(); 
      if (DebugMode && _reader.Read()) 
       Debug.Log("SQLiter - synchronous value is: " + _reader.GetInt32(0)); 
      _reader.Close(); 

      _command.CommandText = "SELECT name FROM sqlite_master WHERE name='" + SQL_TABLE_NAME + "'"; 
      _reader = _command.ExecuteReader(); 
      if (!_reader.Read()) 
      { 
       Debug.Log("SQLiter - Could not find SQLite table " + SQL_TABLE_NAME); 
       _createNewTable = true; 
      } 
      _reader.Close(); 

      if (_createNewTable) 
      { 
       Debug.Log("SQLiter - Dropping old SQLite table if Exists: " + SQL_TABLE_NAME); 

       _command.CommandText = "DROP TABLE IF EXISTS " + SQL_TABLE_NAME; 
       _command.ExecuteNonQuery(); 

       Debug.Log("SQLiter - Creating new SQLite table: " + SQL_TABLE_NAME); 

       _sqlString = "CREATE TABLE IF NOT EXISTS " + SQL_TABLE_NAME + " (" + 
        COL_NAME + " TEXT UNIQUE, " + 
        COL_DESCRIPTION + " TEXT)"; 
       _command.CommandText = _sqlString; 
       _command.ExecuteNonQuery(); 
      } 
      else 
      { 
       if (DebugMode) 
        Debug.Log("SQLiter - SQLite table " + SQL_TABLE_NAME + " was found"); 
      } 

      _connection.Close(); 
     } 

おそらくこれが必要とされていませんが、は...アンドロイドで使用Application.persistentDataPathため

public void Insert(string name, string description) 
    { 
     name = name.ToLower(); 

     _sqlString = "INSERT INTO " + SQL_TABLE_NAME 
      + " (" 
      + COL_NAME + "," 
      + COL_DESCRIPTION 
      + ") VALUES (" 
      + "'" + name + "'," 
      + "'" + description + "');"; 

     if (DebugMode) 
      Debug.Log(_sqlString); 
     ExecuteNonQuery(_sqlString); 
    } 

    public void ExecuteNonQuery(string commandText) 
    { 
     _connection.Open(); 
     _command.CommandText = commandText; 
     _command.ExecuteNonQuery(); 
     _connection.Close(); 
    } 

    private void SQLiteClose() 
    { 
     if (_reader != null && !_reader.IsClosed) 
      _reader.Close(); 
     _reader = null; 

     if (_command != null) 
      _command.Dispose(); 
     _command = null; 

     if (_connection != null && _connection.State != ConnectionState.Closed) 
      _connection.Close(); 
     _connection = null; 
    } 

    public string GetAllWords() 
    { 

     StringBuilder sb = new StringBuilder(); 
     debug.text = "get-antes"; 
     _connection.Open(); 
     debug.text = "get-depois"; 

     _command.CommandText = "SELECT * FROM " + SQL_TABLE_NAME; 
     _reader = _command.ExecuteReader(); 
     while (_reader.Read()) 
     { 

      sb.Append(_reader.GetString(0)).Append("\n"); 
      sb.Append(_reader.GetString(1)).Append("\n"); 
      sb.AppendLine(); 

      if (DebugMode) 
       Debug.Log(sb.ToString()); 
     } 
     _reader.Close(); 
     _connection.Close(); 
     return sb.ToString(); 
    } 
    void OnDestroy() 
    { 
     SQLiteClose(); 
    } 

} 

}

Answer 1

、あなたはアンドロイドのためのビルド設定を変更する必要があります。設定変更>外部（SDカード）への書き込みアクセス。