안드로이드에서 기존 sqlite 테이블을 사용하고 계십니까?

Question

내 안드로이드 애플 리케이션에서 내 기존의 sqlite 데이터베이스를 사용하고 싶습니다 .123.이 튜토리얼을 따라하고 데이터베이스 파일 복사에 성공합니다.하지만 내 문제는 내가 액세스 할 수 없습니다 database.Can 액세스 내 코드를 확인하고 내 데이터베이스에 액세스하는 데 도움이됩니다 ?

public class Databaseopenhelper extends SQLiteOpenHelper { 



    //The Android's default system path of your application database. 
    private static String DB_PATH = "/data/data/com.basim.database/databases/"; 

    private static String DB_NAME = "db3"; 

    private SQLiteDatabase myDataBase; 

    private final Context myContext; 

    /** 
    * Constructor 
    * Takes and keeps a reference of the passed context in order to access to the application assets and resources. 
    * @param context 
    */ 
    public Databaseopenhelper(Context context) { 

     super(context, DB_NAME, null, 1); 
     this.myContext = context; 
    } 

    /** 
    * Creates a empty database on the system and rewrites it with your own database. 
    * */ 
    public void createDataBase() throws IOException{ 

     boolean dbExist = checkDataBase(); 

     if(dbExist){ 
      //do nothing - database already exist 
     }else{ 

      //By calling this method and empty database will be created into the default system path 
       //of your application so we are gonna be able to overwrite that database with our database. 
      this.getReadableDatabase(); 

      try { 

       copyDataBase(); 

      } catch (IOException e) { 

       throw new Error("Error copying database"); 

      } 
     } 

    } 

    /** 
    * Check if the database already exist to avoid re-copying the file each time you open the application. 
    * @return true if it exists, false if it doesn't 
    */ 
    private boolean checkDataBase(){ 

     SQLiteDatabase checkDB = null; 

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

     }catch(SQLiteException e){ 

      //database does't exist yet. 

     } 

     if(checkDB != null){ 

      checkDB.close(); 

     } 

     return checkDB != null ? true : false; 
    } 

    /** 
    * Copies your database from your local assets-folder to the just created empty database in the 
    * system folder, from where it can be accessed and handled. 
    * This is done by transfering bytestream. 
    * */ 
    private void copyDataBase() throws IOException{ 

     //Open your local db as the input stream 
     InputStream myInput = myContext.getAssets().open(DB_NAME); 

     // Path to the just created empty db 
     String outFileName = DB_PATH + DB_NAME; 

     //Open the empty db as the output stream 
     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 void openDataBase() throws SQLException{ 

     //Open the database 
     String myPath = DB_PATH + DB_NAME; 
     myDataBase = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READONLY); 

    } 

    @Override 
    public synchronized void close() { 

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

      super.close(); 

    } 

    @Override 
    public void onCreate(SQLiteDatabase db) { 

    } 

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

    } 

     // Add your public helper methods to access and get content from the database. 
     // You could return cursors by doing "return myDataBase.query(....)" so it'd be easy 
     // to you to create adapters for your views. 

} 

내가 복사 된 데이터베이스 파일에 액세스하는 방법을 알고 싶어, 여기

내가 내 데이터베이스를 복사하는 데 사용되는 방법입니다 .. 감사합니다.

Answer 1

이렇게 시도하십시오.

private DataBaseHelper dataBaseHelper; 
    private SQLiteDatabase sqLiteDatabase; 
sqLiteDatabase = dataBaseHelper.getReadableDatabase(); 
cursor = sqLiteDatabase.rawQuery("SELECT * FROM TABLE_NAME", null); 
     if (cursor != null) { 
      try { 
       cursor.moveToFirst(); 
       do { 
        int abc= 
          cursor.getString(cursor.getColumnIndex("TABLE_COLOUM_NAME")), 

       } while (cursor.moveToNext()); 
      } finally { 
       cursor.close(); 
       sqLiteDatabase.close(); 
      } 

     } 

감사

Answer 2

확인이 방법. 이 방법으로 SQLiteOpenHelper 구현을 평소처럼 투명하게 사용할 수 있습니다. 특별 대우가 없습니다.
using a preloaded sqlite database with SQLiteOpenHelper