通過ForeignCollection遍歷的ORMLite拋出異常

Question

我嘗試遍歷ForeignCollection<OrderItems>。這項工作如果eager設置爲true但惰性選項仍然無法正常工作。

首先，我讓

OrderDataSource orderDS = new OrderDataSource(getAppContext()); 
ws.Order order = orderDS.convertToWS(mOrder,ws.Order.class); 
orderDS.close(); 

凡close()關閉數據庫連接和convertToWS()做迭代。的convertToWS()

部分：

Iterator<OrderItem> itr = order.getOrderItems().iterator(); 

while (itr.hasNext()) 
{ 
    OrderItem orderItem = itr.next(); 
    ... 
} 

close方法是從convertToWS()返回後調用。我與convertToWS()中的其他對象一起工作有任何問題。

我也嘗試使用CloseableIterator並在finally區塊中關閉它，但沒有成功。期待這一點，我不關閉連接。

例外：

02-17 02:21:43.094: E/AndroidRuntime(4820): FATAL EXCEPTION: main 
02-17 02:21:43.094: E/AndroidRuntime(4820): java.lang.IllegalStateException: database /data/data/my_app/databases/my_db (conn# 0) already closed 
02-17 02:21:43.094: E/AndroidRuntime(4820):  at android.database.sqlite.SQLiteDatabase.verifyDbIsOpen(SQLiteDatabase.java:2082) 
02-17 02:21:43.094: E/AndroidRuntime(4820):  at android.database.sqlite.SQLiteDatabase.rawQueryWithFactory(SQLiteDatabase.java:1556) 
02-17 02:21:43.094: E/AndroidRuntime(4820):  at android.database.sqlite.SQLiteDatabase.rawQuery(SQLiteDatabase.java:1538) 
02-17 02:21:43.094: E/AndroidRuntime(4820):  at com.j256.ormlite.android.AndroidCompiledStatement.getCursor(AndroidCompiledStatement.java:162) 
02-17 02:21:43.094: E/AndroidRuntime(4820):  at com.j256.ormlite.android.AndroidCompiledStatement.runQuery(AndroidCompiledStatement.java:57) 
02-17 02:21:43.094: E/AndroidRuntime(4820):  at com.j256.ormlite.stmt.SelectIterator.<init>(SelectIterator.java:55) 
02-17 02:21:43.094: E/AndroidRuntime(4820):  at com.j256.ormlite.stmt.StatementExecutor.buildIterator(StatementExecutor.java:232) 
02-17 02:21:43.094: E/AndroidRuntime(4820):  at com.j256.ormlite.dao.BaseDaoImpl.createIterator(BaseDaoImpl.java:933) 
02-17 02:21:43.094: E/AndroidRuntime(4820):  at com.j256.ormlite.dao.BaseDaoImpl.iterator(BaseDaoImpl.java:531) 
02-17 02:21:43.094: E/AndroidRuntime(4820):  at com.j256.ormlite.dao.BaseDaoImpl.iterator(BaseDaoImpl.java:526) 
02-17 02:21:43.094: E/AndroidRuntime(4820):  at com.j256.ormlite.dao.LazyForeignCollection.seperateIteratorThrow(LazyForeignCollection.java:74) 
02-17 02:21:43.094: E/AndroidRuntime(4820):  at com.j256.ormlite.dao.LazyForeignCollection.iteratorThrow(LazyForeignCollection.java:60) 
02-17 02:21:43.094: E/AndroidRuntime(4820):  at com.j256.ormlite.dao.LazyForeignCollection.closeableIterator(LazyForeignCollection.java:50) 
02-17 02:21:43.094: E/AndroidRuntime(4820):  at com.j256.ormlite.dao.LazyForeignCollection.iterator(LazyForeignCollection.java:45) 
02-17 02:21:43.094: E/AndroidRuntime(4820):  at com.j256.ormlite.dao.LazyForeignCollection.iterator(LazyForeignCollection.java:26) 
02-17 02:21:43.094: E/AndroidRuntime(4820):  at orders.OrderDataSource.convertToWS(OrderDataSource.java:409) 
02-17 02:21:43.094: E/AndroidRuntime(4820):  at fragments.OrderDetailFragment.sendOrder(OrderDetailFragment.java:419) 
02-17 02:21:43.094: E/AndroidRuntime(4820):  at fragments.OrderDetailFragment.doPositiveClick(OrderDetailFragment.java:347) 
02-17 02:21:43.094: E/AndroidRuntime(4820):  at ui.dialogfragments.AlertDialogFragment$1.onClick(AlertDialogFragment.java:54) 
02-17 02:21:43.094: E/AndroidRuntime(4820):  at com.android.internal.app.AlertController$ButtonHandler.handleMessage(AlertController.java:166) 
02-17 02:21:43.094: E/AndroidRuntime(4820):  at android.os.Handler.dispatchMessage(Handler.java:99) 
02-17 02:21:43.094: E/AndroidRuntime(4820):  at android.os.Looper.loop(Looper.java:137) 
02-17 02:21:43.094: E/AndroidRuntime(4820):  at android.app.ActivityThread.main(ActivityThread.java:4424) 
02-17 02:21:43.094: E/AndroidRuntime(4820):  at java.lang.reflect.Method.invokeNative(Native Method) 
02-17 02:21:43.094: E/AndroidRuntime(4820):  at java.lang.reflect.Method.invoke(Method.java:511) 
02-17 02:21:43.094: E/AndroidRuntime(4820):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) 
02-17 02:21:43.094: E/AndroidRuntime(4820):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 
02-17 02:21:43.094: E/AndroidRuntime(4820):  at dalvik.system.NativeStart.main(Native Method) 

Answer 1

你需要有數據庫，以遍歷值，因爲你正在做懶查詢開放的，這意味着你是從數據庫中的第一次訪問對象獲取數據來自外國收藏。

因此，如果您要擴展ORMLiteActivity，那麼您的數據庫將保持打開狀態，直到您銷燬該屏幕。

這裏最主要的是在你使用數據時保持助手打開。