sqlite3_open_v2（「/ data/data/com.food.find/databases/mydatabase」，＆handle，2，NULL）在android中失敗？

我想從資產創建數據庫，但給我錯誤無法打開數據庫，但我運行後再次不給錯誤是完整運行當第一次創建是給我錯誤我把我的logcat在這裏sqlite3_open_v2（「/ data/data/com.food.find/databases/mydatabase」，＆handle，2，NULL）在android中失敗？

07-04 18:28:00.860: E/Database(990): sqlite3_open_v2("/data/data/com.temp.find/databases/tempfind", &handle, 2, NULL) failed 
07-04 18:28:00.870: W/System.err(990): android.database.sqlite.SQLiteException: unable to open database file 
07-04 18:28:00.880: W/System.err(990): at android.database.sqlite.SQLiteDatabase.dbopen(Native Method) 
07-04 18:28:00.880: W/System.err(990): at android.database.sqlite.SQLiteDatabase.<init>(SQLiteDatabase.java:1849) 
07-04 18:28:00.880: W/System.err(990): at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:820) 
07-04 18:28:00.880: W/System.err(990): at com.food.find.RestaurantDatabase.checkDataBase(RestaurantDatabase.java:97) 
07-04 18:28:00.890: W/System.err(990): at com.food.find.RestaurantDatabase.createDataBase(RestaurantDatabase.java:60) 
07-04 18:28:00.890: W/System.err(990): at com.food.find.SplashScreenActivity.onCreate(SplashScreenActivity.java:25) 
07-04 18:28:00.890: W/System.err(990): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 
07-04 18:28:00.890: W/System.err(990): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611) 
07-04 18:28:00.890: W/System.err(990): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663) 
07-04 18:28:00.890: W/System.err(990): at android.app.ActivityThread.access$1500(ActivityThread.java:117) 
07-04 18:28:00.900: W/System.err(990): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931) 
07-04 18:28:00.900: W/System.err(990): at android.os.Handler.dispatchMessage(Handler.java:99) 
07-04 18:28:00.900: W/System.err(990): at android.os.Looper.loop(Looper.java:123) 
07-04 18:28:00.900: W/System.err(990): at android.app.ActivityThread.main(ActivityThread.java:3683) 
07-04 18:28:00.900: W/System.err(990): at java.lang.reflect.Method.invokeNative(Native Method) 
07-04 18:28:00.900: W/System.err(990): at java.lang.reflect.Method.invoke(Method.java:507) 
07-04 18:28:00.900: W/System.err(990): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839) 
07-04 18:28:00.900: W/System.err(990): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597) 
07-04 18:28:00.910: W/System.err(990): at dalvik.system.NativeStart.main(Native Method) 
07-04 18:28:01.030: E/running(990): database opened page size

RestaurantDatabase.java

public class RestaurantDatabase extends SQLiteOpenHelper{ 


    // Contacts Table Columns names 
    private static final String KEY_ID = "id"; 
    private static final String KEY_NAME = "name"; 
    private static final String KEY_FOODADDRESS="address"; 
    private static final String KEY_FOODPHONE = "phonenumber"; 
    private static final String KEY_LATITUDE="latitude"; 
    private static final String KEY_LONGITUDE="longitude"; 



    private static final String TAG_LAT="lat"; 
    private static final String TAG_LONG="lng"; 
    private static final String TAG_RESPONSE = "responseData"; 
    private static final String TAG_TITLENOFORMATING = "titleNoFormatting"; 
    private static final String TAG_ADDRESSLINES="addressLines"; 
    private static final String TAG_PHONENUMBERS="phoneNumbers"; 
    private static final String TAG_NUMBER="number";  
    private static final String TAG_FOOD="food"; 
    private static String DB_PATH ="/data/data/com.temp.find/databases/"; 
    private static String DB_NAME ="tempfind"; 
    private SQLiteDatabase myDataBase; 
    private final Context myContext;  

    String query = ""; 

    public RestaurantDatabase(Context context) 
    { 
     super(context, DB_NAME, null, 1); 
     this.myContext=context;  
    }; 

    public void createDataBase() throws IOException 
    { 

     boolean dbExist = checkDataBase(); 

     if(dbExist) 
     { 

     } 
     else 
     { 


     this.getReadableDatabase(); 

     try 
     { 

      copyDataBase(); 

     } 
     catch (IOException e) 
     { 

      throw new Error("Error copying database"); 

     } 

     } 


    } 


    private boolean checkDataBase() 
    { 

     SQLiteDatabase checkDB = null; 

     try{ 
      String myPath = DB_PATH + DB_NAME; 
      checkDB = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READWRITE); 

     } 
     catch(SQLiteException e) 
     { 
      e.printStackTrace(); 
     } 

     if(checkDB != null) 
     { 
      checkDB.close(); 
     } 

     return checkDB != null ? true : false; 
    } 


    private void copyDataBase() throws IOException 
    { 


     InputStream myInput = myContext.getAssets().open(DB_NAME); 

     String outFileName = DB_PATH + DB_NAME; 
     OutputStream myOutput = new FileOutputStream(outFileName); 

     //transfer bytes from the inputfile to the outputfile 
     byte[] buffer = new byte[1024]; 
     int length; 
     while ((length = myInput.read(buffer))>0){ 
      myOutput.write(buffer, 0, length); 
     } 

     //Close the streams 
     myOutput.flush(); 
     myOutput.close(); 
     myInput.close(); 

    } 

    public RestaurantDatabase(Context context, String name, CursorFactory factory,int version) 
    { 
     super(context, name, factory, version); 
     this.myContext=context; 
    } 


     public void openDataBase() throws SQLException 
     {  
       //Open the database 
       String myPath = DB_PATH + DB_NAME; 
       myDataBase = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READWRITE); 
       Log.e("running", "database opened page size"); 

     } 

     @Override 
     public synchronized void close() 
     { 

      if(myDataBase != null) 
       myDataBase.close(); 
      super.close(); 

     } 



    @Override 
    public void onCreate(SQLiteDatabase db) { 
     // TODO Auto-generated method stub 

    } 

    @Override 
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) 
    { 


    } 

    public String addContact(String title,String address,String phone,String latitude,String longitude) 
    { 

     String check = null; 

     Log.e("Title","--->"+title); 
     Log.e("Address","-->"+address); 
     Log.e("Number","-->"+phone); 
     Log.e("Latitude","-->"+latitude); 
     Log.e("Longitude","-->"+longitude); 

     ContentValues values = new ContentValues(); 
     values.put(KEY_NAME,title); // Contact Name 
     values.put(KEY_FOODADDRESS,address); // Contact Address 
     values.put(KEY_FOODPHONE,phone); // Contact Phone 
     values.put(KEY_LATITUDE,latitude); // Contact Latitude 
     values.put(KEY_LONGITUDE,longitude); // Contact Longitude 

     Log.e("addcontact called","--->"); 

     // Inserting Row 
     myDataBase.insert(TAG_FOOD, null,values);  

     String selectQuery = " SELECT * FROM " + TAG_FOOD ; 

     Cursor cursor = myDataBase.rawQuery(selectQuery, null); 

     Log.e("CURSOR RECORD","--->"+cursor.getCount()); 
     Log.e("INSERT RECORD","--->"+values); 


     return check; 


    } 



}

來源

2013-07-04 start android

你有沒有添加權限將外部存儲寫入androidmanifest？ –

不，我會添加它，並在回覆你之後再次檢查 –

你甚至可以理解這段代碼嗎？ ......如果沒有'/data/data/com.temp，它應該打印這條消息。找到/數據庫/ tempfind'文件 – Selvin

使用此代碼更改chekDatabase這項工作完全

私人布爾checkDataBase（）{

文件DBFILE =新的文件（DB_PATH + DB_NAME）; return dbFile.exists（）;

}

來源

2013-07-06 05:37:30 Mahesh

此代碼是可怕。我會開始刪除整個事情，並重新開始。

首先，如果打算將數據庫打包到應用程序中，請不要爲此編寫自己的代碼。有an existing library, SQLiteAssetHelper，這是測試，調試和支持。更重要的是，它是由某人（Jeff Gilfelt）編寫的，具有Android開發經驗的lot。

第二，如果你使用的是SQLiteOpenHelper（或類似SQLiteAssetHelper一個子類），你是也寫openDatabase()隨時隨地該數據庫，你做錯了。完整且完整的點後面的SQLiteOpenHelper就是有它爲你打開數據庫，所以它可以根據需要創建或升級那個數據庫。

第三，如果你使用的是SQLiteOpenHelper（或子類像SQLiteAssetHelper），你有空空onCreate()方法，你做錯了。這裏需要有代碼來實際創建數據庫，無論這是您繼承的代碼（例如，從SQLiteAssetHelper）還是您編寫的代碼。

第四，如果你正在使用SQLiteOpenHelper（或子類像SQLiteAssetHelper），以及您所呼叫getReadableDatabase()或getWriteableDatabase()和被忽略返回值，你做錯了。您調用這些方法打開數據庫，爲您提供SQLiteDatabase供使用。

這段代碼還有很多錯誤，但是這應該足以讓你更接近合理的實現。

來源

2013-07-04 14:09:39 CommonsWare

sqlite3_open_v2（「/ data/data/com.food.find/databases/mydatabase」，＆handle，2，NULL）在android中失敗？

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