.DatabaseObjectNotClosedException

Question

我的logcat顯示上述錯誤。

然而，在Databasehelper類的所有方法中，我調用了db對象的close（）方法。

這是db helper類的一些代碼。

public MyDatabaseAdapter(Context context,String databaseName){ 
      super(context,databaseName,null,1); 
     this.mycontext=context; 
     try{ 
      Log.v("Path",DB_PATH); 
     DB_NAME=databaseName; 
     Log.v("name",DB_NAME); 
     openDataBase();   
     }catch(Exception e) 
     { 
      Log.e("gezaaako",e.toString()); 
     } 
    } 

    public SQLiteDatabase openDataBase() throws SQLException 
    { 
     String myPath=DB_PATH+DB_NAME; 
     Log.e("CheckPath",myPath); 
     if (myDataBase==null) 
     { 
      try { 
       createdatabase(); 
      } catch (IOException e) { 
       // TODO Auto-generated catch block 
       e.printStackTrace(); 
      } 

     myDataBase=SQLiteDatabase.openDatabase(myPath,null,SQLiteDatabase.OPEN_READWRITE); 
     } 
     return myDataBase; 
    } 
    public synchronized void close() 
    { 
     if(myDataBase!=null){ 
     myDataBase.close(); 
     } 
     super.close(); 
    } 
public long AddMeter(Meters meter){ 
    SQLiteDatabase db=this.getWritableDatabase(); 
    ContentValues values = new ContentValues(); 
    values.put(SERIALNUMBER, meter.getSerialNumber().toString()); 
    values.put(METERNUMBER, meter.getMeterNumber().toString()); 
    values.put(DATEADDED, getDateTime()); 
    long meterid=db.insert(TABLE_METERS, null, values); 
    db.close(); 
    return meterid; 


} 

在方法AddMeter中，我顯式調用close方法。

下面是一個使用一個光標

public List<TenantMeterID> GetTenantMeterIds() 
{ 
    List<TenantMeterID> meterlist = new ArrayList<TenantMeterID>(); 
    String selectQuery = " SELECT * FROM " +View_Tenant_Meter_id; 
    Log.e("LOG", selectQuery);  
    SQLiteDatabase db = this.getReadableDatabase(); 
    Cursor c = db.rawQuery(selectQuery, null); 
    if(c.moveToFirst()){ 
     do{ 
      TenantMeterID t = new TenantMeterID(); 
      t.set_id(Integer.parseInt(c.getString(c.getColumnIndex(KEY_ID)))); 
      t.setFullName(c.getString(c.getColumnIndex(TENANT))); 

      meterlist.add(t); 
     } while(c.moveToNext()); 

    } 
    c.close(); 
    db.close(); 
    return meterlist; 
} 

再者，我想，我明確地關閉遊標和db對象的方法。

這裏logcat的

01-31 10:42:53.843: D/dalvikvm(334): GC_CONCURRENT freed 179K, 50% free 2825K/5639K, external 734K/1032K, paused 4ms+8ms 
01-31 10:42:53.903: E/Database(334): close() was never explicitly called on database 'data/data/com.example.metermanager/databases/meterapp.sqlite' 
01-31 10:42:53.903: E/Database(334): android.database.sqlite.DatabaseObjectNotClosedException: Application did not close the cursor or database object that was opened here 
01-31 10:42:53.903: E/Database(334): at android.database.sqlite.SQLiteDatabase.<init>(SQLiteDatabase.java:1847) 
01-31 10:42:53.903: E/Database(334): at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:820) 
01-31 10:42:53.903: E/Database(334): at meter.manager.helper.MyDatabaseAdapter.openDataBase(MyDatabaseAdapter.java:194) 
01-31 10:42:53.903: E/Database(334): at meter.manager.helper.MyDatabaseAdapter.<init>(MyDatabaseAdapter.java:105) 
01-31 10:42:53.903: E/Database(334): at com.example.metermanager.allTenants.<init>(allTenants.java:32) 
01-31 10:42:53.903: E/Database(334): at com.example.metermanager.GetTeantList.onCreate(GetTeantList.java:21) 
01-31 10:42:53.903: E/Database(334): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 
01-31 10:42:53.903: E/Database(334): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611) 
01-31 10:42:53.903: E/Database(334): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663) 
01-31 10:42:53.903: E/Database(334): at android.app.ActivityThread.access$1500(ActivityThread.java:117) 
01-31 10:42:53.903: E/Database(334): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931) 
01-31 10:42:53.903: E/Database(334): at android.os.Handler.dispatchMessage(Handler.java:99) 
01-31 10:42:53.903: E/Database(334): at android.os.Looper.loop(Looper.java:123) 
01-31 10:42:53.903: E/Database(334): at android.app.ActivityThread.main(ActivityThread.java:3683) 
01-31 10:42:53.903: E/Database(334): at java.lang.reflect.Method.invokeNative(Native Method) 
01-31 10:42:53.903: E/Database(334): at java.lang.reflect.Method.invoke(Method.java:507) 
01-31 10:42:53.903: E/Database(334): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839) 
01-31 10:42:53.903: E/Database(334): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597) 
01-31 10:42:53.903: E/Database(334): at dalvik.system.NativeStart.main(Native Method) 

這似乎表明，我必須expicitly關閉db對象在我使用DB輔助類的類。

是這樣嗎？

我一直在使用，只需在類中調用它。例如

public allTenants(Context context1) {  
     this.context=context1; 
     MyDatabaseAdapter db= new MyDatabaseAdapter(context1,DB_NAME); 
     readings=db.GetAllTenants(); 
    } 

在上面的例子中，如何顯式調用close方法？

讀取後= db.GetAllTenants（）;？

如果我的文章包含不相關的部分，我很抱歉！

羅納德

Answer 1

public class DBAdapter 
{ 
     private static final String DATABASE_NAME = "GSDATA.db"; 
     private static final int DATABASE_VERSION = 2; 
      private static final String CREATE_COVERPHOTO_TABLE = 
       "CREATE TABLE IF NOT EXISTS COVERPHOTO (path Text,date DATE);"; 

     private final Context context; 
     public String group; 
     private DatabaseHelper DBHelper; 
     private static SQLiteDatabase db; 






     public DBAdapter(Context ctx) 
     { 
      this.context = ctx; 
      DBHelper = new DatabaseHelper(context); 
     } 
     private class DatabaseHelper extends SQLiteOpenHelper 
     { 
      DatabaseHelper(Context context) 
      { 
       super(context, DATABASE_NAME, null, DATABASE_VERSION); 
      } 
      @Override 
      public void onCreate(SQLiteDatabase db) 
      { 
       db.execSQL(CREATE_COVERPHOTO_TABLE); 

       System.out.println("The Database is Created Here :"); 
      } 

      @Override 
      public void onUpgrade(SQLiteDatabase db, int 
       oldVersion, int newVersion) 
      { 
       //db.execSQL("DROP TABLE IF EXISTS calSimpleNote"); 
       onCreate(db); 
      } 
     } //database helper class complete 

     //---opens the database--- 
     public DBAdapter open() throws SQLException 
     { 
      db = DBHelper.getWritableDatabase(); 
      return this; 
     } 
     //---closes the database---  
     public void close() 
     { 
      DBHelper.close(); 
      db.close(); 
     } 

    // and use below code where you close or open data base 

    db.open() 
    // your code 
    db.close(); 

Answer 2

Cursor c = db.rawQuery(selectQuery, null); 
    if(c.moveToFirst()){ 
     do{ 
      TenantMeterID t = new TenantMeterID(); 
      t.set_id(Integer.parseInt(c.getString(c.getColumnIndex(KEY_ID)))); 
      t.setFullName(c.getString(c.getColumnIndex(TENANT))); 

      meterlist.add(t); 
     } while(c.moveToNext()); 

    } 
    c.close(); 
    //db.close(); 
    return meterlist; 

在MainActivity實施onDestory（）或的onPause（） 聲明數據庫引用作爲公共變量

SQLiteDatabase分貝= this.getReadableDatabase（）;

@Override 
    protected void onPause() { or protected void onDestroy() 
    super.onPause(); 
    db.close(); 

    }