나만의 SQLite 데이터베이스 사용

Question

나는 sqlite 데이터베이스를 가지고 있는데,이 파일을 "assets"폴더에 넣습니다. 다음과 같은

코드는, Pls는

내 자신의 SQLite는 데이터베이스를 사용하는 방법, 도움이 코드에 문제가 있는지 알려줍니다.

public class DataBaseHelper extends SQLiteOpenHelper { 

    private static String DB_PATH = "/data/data/com.SGMalls/databases/"; 

    private static String DB_NAME = "mallMapv2.sqlite"; 

    private SQLiteDatabase myDataBase; 

    private final Context myContext; 
    public DataBaseHelper(Context context) { 
      super(context, DB_NAME, null, 1); 
      this.myContext = context; 
    } 
    public void createDataBase() throws IOException { 
       File dbDir = new File(DB_PATH); 
      if (!dbDir.exists()) { 
       dbDir.mkdir(); 
      } 
      boolean dbExist = checkDataBase(); 
      if (dbExist) { 
      } else { 
        this.getReadableDatabase(); 
        try { 
          copyDataBase(); 
        } catch (IOException e) { 
          throw new Error("Error copying database"); 
        } 
      } 
      close(); 
    } 
    private boolean checkDataBase() { 
      SQLiteDatabase checkDB = null; 
    boolean isnull=false; 
      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) { 
     isnull=true; 
        checkDB.close(); 
      } 
      return isnull; 
    } 
    private void copyDataBase() throws IOException { 
      InputStream myInput = myContext.getAssets().open(DB_NAME); 
      String outFileName = DB_PATH + DB_NAME; 
      OutputStream myOutput = new FileOutputStream(outFileName); 
      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) { 

    } 
} 

public class GetData {  

private static String DB_PATH = "/data/data/com.SGMalls/databases/mallMapv2.sqlite"; 
     // private static String DB_NAME = "mallMapv2.sqlite"; 

    public static ArrayList<Mall> getMalls() { 

      ArrayList<Mall> mallsList = new ArrayList<Mall>(); 

      SQLiteDatabase malldatabase = SQLiteDatabase.openDatabase(DB_PATH, 
          null, SQLiteDatabase.OPEN_READONLY); 

      String queryString="select id,title from malls order by title"; 

      Cursor cursor=malldatabase.rawQuery(queryString, null); 

       if(cursor!=null){ 
         cursor.moveToFirst(); 
         while(!cursor.isLast()){ 
           Mall mall=new Mall(); 
           mall.setMallid(cursor.getInt(0)); 
           mall.setMallname(cursor.getString(0)); 
           mallsList.add(mall); 
           cursor.moveToNext(); 
         } 
       } 
       malldatabase.close(); 
      return mallsList; 
    } 
} 

오류 메시지 :

---

매우

ERROR/Database(725): sqlite3_open_v2("/data/data/com.SGMalls/databases/ mallMapv2.sqlite", &handle, 1, NULL) failed

03-15 22:34:11.747: ERROR/AndroidRuntime(725): Uncaught handler: thread main exiting due to uncaught exception

03-15 22:34:11.766: ERROR/AndroidRuntime(725): java.lang.Error: Error copying database

덕분에 모든 로그 오류 메시지

03-16 16:19:18.871: ERROR/vold(550): Error opening switch name path 

'/sys/class/switch/test2' (No such file or directory) 

03-16 16:19:18.871: ERROR/vold(550): Error bootstrapping switch '/sys/class/switch/test2' (m) 

03-16 16:19:18.871: ERROR/vold(550): Error opening switch name path '/sys/class/switch/test' (No such file or directory) 

03-16 16:19:18.871: ERROR/vold(550): Error bootstrapping switch '/sys/class/switch/test' (m) 
03-16 16:19:19.091: ERROR/flash_image(558): can't find recovery partition 

03-16 16:19:33.100: ERROR/MemoryHeapBase(577): error opening /dev/pmem: No such file or directory 

03-16 16:19:33.100: ERROR/SurfaceFlinger(577): Couldn't open /sys/power/wait_for_fb_sleep or /sys/power/wait_for_fb_wake 

03-16 16:19:33.151: ERROR/GLLogger(577): couldn't load <libhgl.so> library (Cannot find library) 

03-16 16:19:33.261: ERROR/GLLogger(577): couldn't load <libhgl.so> library (Cannot find library) 

03-16 16:19:36.471: ERROR/BatteryService(577): Could not open '/sys/class/power_supply/usb/online' 

03-16 16:19:36.471: ERROR/BatteryService(577): Could not open '/sys/class/power_supply/battery/batt_vol' 

03-16 16:19:36.471: ERROR/BatteryService(577): Could not open '/sys/class/power_supply/battery/batt_temp' 

03-16 16:19:36.850: ERROR/EventHub(577): could not get driver version for /dev/input/mouse0, Not a typewriter 

03-16 16:19:36.880: ERROR/EventHub(577): could not get driver version for /dev/input/mice, Not a typewriter 

03-16 16:19:36.950: ERROR/System(577): Failure starting core service 

03-16 16:19:36.950: ERROR/System(577): java.lang.SecurityException 

03-16 16:19:36.950: ERROR/System(577):  at android.os.BinderProxy.transact(Native Method) 

03-16 16:19:36.950: ERROR/System(577):  at 
android.os.ServiceManagerProxy.addService(ServiceManagerNative.java:146) 

03-16 16:19:36.950: ERROR/System(577):  at android.os.ServiceManager.addService(ServiceManager.java:72) 

03-16 16:19:36.950: ERROR/System(577):  at com.android.server.ServerThread.run(SystemServer.java:163) 

03-16 16:19:36.959: ERROR/AndroidRuntime(577): Crash logging skipped, no checkin service 

03-16 16:19:38.219: ERROR/LockPatternKeyguardView(577): Failed to bind to GLS while 
checking for account 
03-16 16:19:39.790: ERROR/jdwp(623): Failed sending req to debugger: Broken pipe (-1 of 27) 
03-16 16:19:39.790: ERROR/jdwp(623): Failed sending reply to debugger: Broken pipe 
03-16 16:19:42.960: ERROR/ApplicationContext(577): Couldn't create directory for SharedPreferences file shared_prefs/wallpaper-hints.xml 
03-16 16:19:44.051: ERROR/ActivityThread(621): Failed to find provider info for android.server.checkin 
03-16 16:19:45.341: ERROR/ActivityThread(621): Failed to find provider info for android.server.checkin 

03-16 16:19:45.432: ERROR/ActivityThread(621): Failed to find provider info for android.server.checkin 
03-16 16:19:51.651: ERROR/Database(715): sqlite3_open_v2("/data/data/com.SGMalls/databases/mallMapv2.sqlite", &handle, 1, NULL) failed 
03-16 16:19:51.701: ERROR/AndroidRuntime(715): Uncaught handler: thread main exiting due to uncaught exception 

03-16 16:19:51.710: ERROR/AndroidRuntime(715): java.lang.Error: Error copying database 

03-16 16:19:51.710: ERROR/AndroidRuntime(715):  at Unit.DataBaseHelper.createDataBase(DataBaseHelper.java:47) 

03-16 16:19:51.710: ERROR/AndroidRuntime(715):  at com.Test.Test.onCreate(Test.java:23) 

03-16 16:19:51.710: ERROR/AndroidRuntime(715):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1123) 

03-16 16:19:51.710: ERROR/AndroidRuntime(715):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2231) 

03-16 16:19:51.710: ERROR/AndroidRuntime(715):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2284) 

03-16 16:19:51.710: ERROR/AndroidRuntime(715):  at android.app.ActivityThread.access$1800(ActivityThread.java:112) 

03-16 16:19:51.710: ERROR/AndroidRuntime(715):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1692) 

03-16 16:19:51.710: ERROR/AndroidRuntime(715):  at android.os.Handler.dispatchMessage(Handler.java:99) 

03-16 16:19:51.710: ERROR/AndroidRuntime(715):  at android.os.Looper.loop(Looper.java:123) 

03-16 16:19:51.710: ERROR/AndroidRuntime(715):  at android.app.ActivityThread.main(ActivityThread.java:3948) 

03-16 16:19:51.710: ERROR/AndroidRuntime(715):  at java.lang.reflect.Method.invokeNative(Native Method) 

03-16 16:19:51.710: ERROR/AndroidRuntime(715):  at java.lang.reflect.Method.invoke(Method.java:521) 

03-16 16:19:51.710: ERROR/AndroidRuntime(715):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:782) 
03-16 16:19:51.710: ERROR/AndroidRuntime(715):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:540) 

03-16 16:19:51.710: ERROR/AndroidRuntime(715):  at dalvik.system.NativeStart.main(Native Method) 

Answer 1

이 버그가 이미이 사육되고있다.

Bug Report Android

를 사용하여 해결 방법으로이 API :

Context.openOrCreateDatabase("mmyown.db", MODE_PRIVATE, null); 

Answer 2

이 코드를 사용하여 checkDataBase() 메소드를 교체하십시오 :

public boolean databaseExist() 
{ 
    File dbFile = new File(DB_PATH + DB_NAME); 
    return dbFile.exists(); 
} 

이가 문제를 해결하는 것입니다. :)