안드로이드에서 sqlite 데이터베이스를 열 수 없습니다

두 데이터베이스, SYSTEM_DB1 및 USER_DB1을 사용하고 있습니다. SYSTEM_DB1은 Android SQLiteAssetHelper을 사용하여 자산에서 전화 메모리로 복사됩니다. USER_DB1은 SQLiteOpenHelper을 확장하여 간단히 만듭니다.안드로이드에서 sqlite 데이터베이스를 열 수 없습니다

코드 ABT 핵심 사항 다음과 같습니다 내 활동에 동시에 데이터베이스 를 사용하는 sqlite가에 ATTACH 명령을 사용하려고했습니다

가.

이전 데이터를 추출한 다음 삭제하려면 이전 데이터베이스 Db_bunduled이 있습니다. 다음

public class UserDBHelper extends SQLiteOpenHelper implements Constants { 

    public UserDBHelper(Context context) { 
     super(context, USER_DATABASE_NAME_1, null, 1); 

    } 

    @Override 
    public void onCreate(SQLiteDatabase db) { 

     Log.d(TAG, "starting oncreate in userdbhelper"); 
     String stmt_learntWords = String.format(
       "CREATE TABLE %s (%s INTEGER PRIMARY KEY, %s TEXT NOT NULL);", 
       TABLE_LEARNT_WORDS, _ID, ENTRY_ID); 
     db.execSQL(stmt_learntWords); 

//... 

    } 

    @Override 
    public void onUpgrade(SQLiteDatabase arg0, int arg1, int arg2) { 
     //no code 
    } 

}

다음 UserDBHelper에 대한 코드

public class SystemDBAssetHelper extends SQLiteAssetHelper implements Constants { 
    String DB_PATH; 
    public SystemDBAssetHelper(Context context) { 
     super(context, SYSTEM_DATABASE_NAME_1, null, 1); 
     DB_PATH= context.getApplicationInfo().dataDir + 
       "/databases/"; 



     if (checkDataBase(context, DATABASE_NAME_OLD)) { 
      OldDbHelper oldDB = new OldDbHelper(context); 
      String[] currArgs = { String.valueOf(OldDbHelper.STATUS_LEARNT) }; 
      Cursor cursor = oldDB.getReadableDatabase().query(
        TABLE_SYS_DICTIONARY, null, OldDbHelper.WORD_STATUS + "=?", 
        currArgs, null, null, null); 

     //... 

      cursor.close(); 
      oldDB.close(); 

      Iterator<String> it = al.iterator(); 

      while (it.hasNext()) { 
       String[] Args = { String.valueOf(it.next()) }; 

       Cursor cursor1 = this.getReadableDatabase().query(
         TABLE_SYS_DICTIONARY, null, WORD + "=?", Args, null, 
         null, null); 

       UserDBHelper user_db = new UserDBHelper(context); 

       //... 

       user_db.close(); 

      } 

     } 

    } 

    public boolean checkDataBase(Context context, String DB_NAME) { 

     SQLiteDatabase checkDB = null; 


     try { 
      checkDB = SQLiteDatabase.openDatabase(DB_PATH+DB_NAME, null, 
        SQLiteDatabase.OPEN_READONLY); 
     } catch (Exception e) { 

      // e.printStackTrace(); 
      return false; 

     } 

     if (checkDB != null) { 

      checkDB.close(); 

     } 

     return checkDB != null ? true : false; 




    } 
}

다음입니다 : SystemDBAssetHelper의 코드

@Override 
protected void onResume() { 
super.onResume(); 

SystemDBAssetHelper sys_db=new SystemDBAssetHelper(this); 
UserDBHelper user_db = new UserDBHelper(this); 

boolean b=sys_db.checkDataBase(this, USER_DATABASE_NAME_1); 
Log.d(TAG, "USER_DB1 exists:"+b); 

b=sys_db.checkDataBase(this, SYSTEM_DATABASE_NAME_1); 
Log.d(TAG, "SYSTEM_DB1 exists:"+b); 


user_db.getWritableDatabase().execSQL(
     String.format("ATTACH DATABASE %s AS %s;", 
       SYSTEM_DATABASE_NAME_1, SYSTEM_DATABASE_NAME_1)); 
Log.d(TAG, "after attaching sysdb"); 
user_db.getWritableDatabase().execSQL(
     String.format("ATTACH DATABASE %s AS %s;", 
       USER_DATABASE_NAME_1, USER_DATABASE_NAME_1)); 
Log.d(TAG, "after attaching userdb"); 
Cursor cursor = user_db 
     .getReadableDatabase() 
     .rawQuery(
       String.format(
         "SELECT * FROM %s.%s INNER JOIN %s.%s ON %s.%s = %s.%s;", 
         USER_DATABASE_NAME_1, TABLE_LEARNT_WORDS, 
         SYSTEM_DATABASE_NAME_1, TABLE_SYS_DICTIONARY, 
         TABLE_LEARNT_WORDS, ENTRY_ID, 
         TABLE_SYS_DICTIONARY, ENTRY_ID), null); 

//... 

    user_db.close(); 
}

다음입니다 :

는 다음 내 활동의 코드 로그입니다 :

06-23 16:17:45.830: I/Database(2910): sqlite returned: error code = 14, msg = cannot open file at line 27205 of [42537b6056] 
06-23 16:17:45.830: E/Database(2910): sqlite3_open_v2("/data/data/com.vishal.myapp/databases/Db_bunduled", &handle, 1, NULL) failed 
06-23 16:17:45.830: I/Database(2910): sqlite returned: error code = 14, msg = cannot open file at line 27205 of [42537b6056] 
06-23 16:17:45.830: E/Database(2910): sqlite3_open_v2("/data/data/com.vishal.myapp/databases/USER_DB1", &handle, 1, NULL) failed 
06-23 16:17:45.830: D/vishal(2910): USER_DB1 exists:false 
06-23 16:17:45.840: I/Database(2910): sqlite returned: error code = 14, msg = cannot open file at line 27205 of [42537b6056] 
06-23 16:17:45.840: E/Database(2910): sqlite3_open_v2("/data/data/com.vishal.myapp/databases/SYSTEM_DB1", &handle, 1, NULL) failed 
06-23 16:17:45.840: D/vishal(2910): SYSTEM_DB1 exists:false 
06-23 16:17:45.869: D/vishal(2910): starting oncreate in userdbhelper 
06-23 16:17:45.879: D/vishal(2910): ending oncreate in userdbhelper 
06-23 16:17:45.889: I/Database(2910): sqlite returned: error code = 14, msg = cannot open file at line 27205 of [42537b6056] 
06-23 16:17:45.889: I/Database(2910): sqlite returned: error code = 14, msg = statement aborts at 5: [ATTACH DATABASE SYSTEM_DB1 AS SYSTEM_DB1;] unable to open database: SYSTEM_DB1 
06-23 16:17:45.889: E/Database(2910): Failure 14 (unable to open database: SYSTEM_DB1) on 0x225858 when executing 'ATTACH DATABASE SYSTEM_DB1 AS SYSTEM_DB1;' 
06-23 16:17:45.889: D/AndroidRuntime(2910): Shutting down VM 
06-23 16:17:45.889: W/dalvikvm(2910): threadid=1: thread exiting with uncaught exception (group=0x40018560) 
06-23 16:17:45.899: E/AndroidRuntime(2910): FATAL EXCEPTION: main 
06-23 16:17:45.899: E/AndroidRuntime(2910): java.lang.RuntimeException: Unable to resume activity {com.vishal.myapp/com.vishal.myapp.ActivityLearntWords}: android.database.sqlite.SQLiteException: unable to open database: SYSTEM_DB1: ATTACH DATABASE SYSTEM_DB1 AS SYSTEM_DB1; 

//... 

06-23 16:17:45.899: E/AndroidRuntime(2910): Caused by: android.database.sqlite.SQLiteException: unable to open database: SYSTEM_DB1: ATTACH DATABASE SYSTEM_DB1 AS SYSTEM_DB1; 
06-23 16:17:45.899: E/AndroidRuntime(2910):  at android.database.sqlite.SQLiteDatabase.native_execSQL(Native Method) 
06-23 16:17:45.899: E/AndroidRuntime(2910):  at android.database.sqlite.SQLiteDatabase.execSQL(SQLiteDatabase.java:1763) 
06-23 16:17:45.899: E/AndroidRuntime(2910):  at com.vishal.myapp.ActivityLearntWords.onResume(ActivityLearntWords.java:47) 

//...

응용 프로그램의 .../데이터베이스/디렉토리의 허가 사항은 다음과 같습니다

-rw-rw---- 1 app_55 app_55  8192 Jun 23 16:17 USER_DB1 
-rw-rw---- 1 app_55 app_55  1024 Jun 23 16:17 webview.db 
-rw-r--r-- 1 app_55 app_55  32768 Jun 23 16:17 webview.db-shm 
-rw-r--r-- 1 app_55 app_55  17848 Jun 23 16:17 webview.db-wal 
-rw-rw---- 1 app_55 app_55  1024 Jun 23 16:17 webviewCache.db 
-rw-r--r-- 1 app_55 app_55  32768 Jun 23 16:17 webviewCache.db-shm 
-rw-r--r-- 1 app_55 app_55  20992 Jun 23 16:17 webviewCache.db-wal

출처

2014-06-23 vishalaksh

여기 내 마지막 코드입니다, 혼동을 피하기 위해. – SMR

나는 아직 활동에서 작성되지 않은 데이터베이스에 액세스하려고했다.

user_db.getWritableDatabase().execSQL(
     String.format("ATTACH DATABASE %s AS %s;", 
       SYSTEM_DATABASE_NAME_1, SYSTEM_DATABASE_NAME_1));

데이터베이스 파일은 단순히 생성자를 호출하여 생성되지 않습니다. 다른 데이터베이스 관련 작업을 수행하기 전에 먼저 sys_db.getWritableDatabase()으로 전화해야했습니다.

또한 official documentation에서 원래 테이블을 '기본'이라고합니다. 당신은 당신이 제공하는 디렉토리에 기본적으로 데이터베이스 파일들이의 경로를 제공 할 필요가없는

@Override 
protected void onResume() { 

    super.onResume(); 

    SystemDBAssetHelper sys_db = new SystemDBAssetHelper(this); 
      sys_db.getWritableDatabase(); 
      sys_db.close(); 


    String FIRST_DB_PATH = this.getDatabasePath(SYSTEM_DATABASE_NAME_1) 
      .toString(); 

    UserDBHelper user_db = new UserDBHelper(this); 
    user_db.getWritableDatabase().execSQL(
      String.format("ATTACH DATABASE '%s' AS %s;", FIRST_DB_PATH, 
        SYSTEM_DATABASE_NAME_1)); 

    Cursor cursor = user_db 
      .getReadableDatabase() 
      .rawQuery(
        String.format(
          "SELECT * FROM %s.%s INNER JOIN %s.%s ON %s.%s = %s.%s;", 
          "main", TABLE_USER, 
          SYSTEM_DATABASE_NAME_1, TABLE_SYS, 
          TABLE_USER, ENTRY_ID, 
          TABLE_SYS, ENTRY_ID), null); 

    //... 

    cursor.close(); 
    user_db.close(); 
}

출처

2014-06-23 14:08:06 vishalaksh

안드로이드에서 sqlite 데이터베이스를 열 수 없습니다

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