android sqlite不能找到表「沒有這樣的表」

Question

這真的很頭痛因爲只是一些人有這個麻煩..我嘗試了很多東西，真的很累。我給的代碼，並祈禱:(

如果任何人都可以解決真的很感謝！

StartActivity：

this.dhn = DataHelper.getDataHelper(this); 

    File directory = new File(Environment.getDataDirectory() + File.separator + "data" + File.separator + "ko.tb" + File.separator + "databases"); 
    if(directory.exists()) 
    { 
    } 
    else 
    { 
     directory.mkdirs(); 
     updateDB(); 
    } 
    directory = null; 

    try { 
     guid = this.dhn.Guid(); 

     if(this.dhn.getSettings("dbVersion") == null || Integer.parseInt(this.dhn.getSettings("dbVersion")) != Version || !this.dhn.isTableExists("UserInfo")) 
     { 
      updateDB(); 
     } 
    } 
    catch (SQLiteException e) 
    { 
     updateDB();  
     guid = this.dhn.Guid(); 
    } 


    public void updateDB() 
    { 
     this.dhn.close(); 

     try { 
      InputStream myInput; 

       myInput = getAssets().open("KelimeDB1.db"); 

      // Path to the just created empty db 
      String outFileName = "/data/data/ko.tb/databases/" 
        + "KelimeDB1.db"; 

      // 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(); 
      buffer = null; 
      outFileName = null; 
      this.dhn.close(); 
      this.dhn = null; 
      this.dhn = DataHelper.getDataHelper(this); 
     } catch (IOException e1) { 
      // TODO Auto-generated catch block 
      e1.printStackTrace(); 
     } 
    } 

DataHelper：

private static DataHelper singleton; 

public static DataHelper getDataHelper(Context context) { 
     if (singleton == null) { 
       singleton = new DataHelper(context); 
       OpenHelper openHelper = new OpenHelper(singleton.context); 
       singleton.db = openHelper.getWritableDatabase(); 
     } 
     if(!singleton.db.isOpen()){ 
       OpenHelper openHelper = new OpenHelper(singleton.context); 
       singleton.db = openHelper.getWritableDatabase(); 
     } 
     singleton.context = context; 
     return singleton; 
} 

private DataHelper(Context context) { 
     this.context = context; 
} 

public void close() { 
    if (singleton != null) 
    { 
     singleton.db.close(); 
     singleton.db = null; 
     singleton = null; 
     //this.db.close(); 
     this.db = null; 
    } 
} 


public String Guid() { 

    String SqlQuery = "SELECT Value FROM UserInfo WHERE key = 'guid'"; 
    String guid = null; 
    Cursor cursor = this.db.rawQuery(SqlQuery, null); 
    if (cursor.moveToFirst()) { 
     guid = cursor.getString(0); 
    } 
    cursor.close(); 
    return guid; 
} 

錯誤：

java.lang.RuntimeException: Unable to start activity ComponentInfo{ko.tb/ko.tb.StartScreen}: android.database.sqlite.SQLiteException: no such table: UserInfo: , while compiling: SELECT Value FROM UserInfo WHERE key = 'guid' 
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1659) 
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1675) 
at android.app.ActivityThread.access$1500(ActivityThread.java:121) 
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:943) 
at android.os.Handler.dispatchMessage(Handler.java:99) 
at android.os.Looper.loop(Looper.java:130) 
at android.app.ActivityThread.main(ActivityThread.java:3701) 
at java.lang.reflect.Method.invokeNative(Native Method) 
at java.lang.reflect.Method.invoke(Method.java:507) 
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:866) 
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:624) 
at dalvik.system.NativeStart.main(Native Method) 
Caused by: android.database.sqlite.SQLiteException: no such table: UserInfo: , while compiling: SELECT Value FROM UserInfo WHERE key = 'guid' 
at android.database.sqlite.SQLiteCompiledSql.native_compile(Native Method) 
at android.database.sqlite.SQLiteCompiledSql.compile(SQLiteCompiledSql.java:92) 
at android.database.sqlite.SQLiteCompiledSql.<init>(SQLiteCompiledSql.java:65) 
at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:83) 
at android.database.sqlite.SQLiteQuery.<init>(SQLiteQuery.java:49) 
at android.database.sqlite.SQLiteDirectCursorDriver.query(SQLiteDirectCursorDriver.java:42) 
at android.database.sqlite.SQLiteDatabase.rawQueryWithFactory(SQLiteDatabase.java:1364) 
at android.database.sqlite.SQLiteDatabase.rawQuery(SQLiteDatabase.java:1332) 
at ko.tb.DataHelper.Guid(DataHelper.java:171) 
at ko.tb.StartScreen.onCreate(StartScreen.java:76) 
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1623) 
... 11 more 

Answer 1

你m唉想檢查this library out for managing your database。它旨在幫助開發人員使用預先創建的數據庫發佈應用程序。