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Android系統是否自動關閉打開的SQLite數據庫?我已經實現了一個用於訪問數據的單例類,有時候這些方法需要在工作線程上運行。我有與在後臺運行一個查詢功能同步,這裏的代碼:Android:FC查詢sqlite時打開數據庫
public ArrayList<ActualCall> getUnsentCalls(boolean forUnsentSignature) {
ArrayList<ActualCall> calls = new ArrayList<ActualCall>();
Cursor c;
open();
if (forUnsentSignature)
c = db.rawQuery("SELECT * FROM " + TXN_ACTUAL_CALL_COMPONENT
+ " WHERE sentFlag=1 and sigSentFlag=?", new String[] {"0"});
else
c = db.rawQuery("SELECT * FROM " + TXN_ACTUAL_CALL_COMPONENT
+ " WHERE sentFlag=? AND signature != ''", new String[] {"0"});
if (c.moveToFirst()) {
do {
if (!db.isOpen())
open();
ActualCall call = new ActualCall();
call.setAcpComponentId(c.getString(c.getColumnIndex("acpComponentId")));
call.setAcpDate(c.getString(c.getColumnIndex("acpDate")));
call.setAcpId(c.getString(c.getColumnIndex("acpId")));
call.setCallEndTime(c.getString(c.getColumnIndex("callEndTime")));
call.setCallStartTime(c.getString(c.getColumnIndex("callStartTime")));
call.setCoordinates(c.getString(c.getColumnIndex("coordinates")));
call.setDeviceTimestamp(c.getString(c.getColumnIndex("deviceTimestamp")));
call.setDoctorId(c.getString(c.getColumnIndex("doctorId")));
call.setSignature(c.getString(c.getColumnIndex("signature")));
call.setSigSentFlag(c.getString(c.getColumnIndex("sigSentFlag")));
call.setTimeSpent(c.getString(c.getColumnIndex("timeSpent")));
call.setSentFlag(c.getString(c.getColumnIndex("sentFlag")));
call.setCoordinates(c.getString(c.getColumnIndex("coordinates")));
calls.add(call);
} while (c.moveToNext());
}
c.close();
db.close();
return calls;
}
正如你所看到的,我已經叫open()的初始行還我收到講述了一個錯誤我的數據庫已經關閉。這裏的堆棧跟蹤:
java.lang.IllegalStateException: database
/data/data/com.***.****/databases/****.db (conn# 0) already closed
at android.database.sqlite.SQLiteDatabase.verifyDbIsOpen(SQLiteDatabase.java:2123)
at android.database.sqlite.SQLiteDatabase.lock(SQLiteDatabase.java:398)
at android.database.sqlite.SQLiteDatabase.lock(SQLiteDatabase.java:390)
at android.database.sqlite.SQLiteQuery.fillWindow(SQLiteQuery.java:74)
at android.database.sqlite.SQLiteCursor.fillWindow(SQLiteCursor.java:311)
at android.database.sqlite.SQLiteCursor.getCount(SQLiteCursor.java:292)
at android.database.AbstractCursor.moveToPosition(AbstractCursor.java:156)
at android.database.AbstractCursor.moveToFirst(AbstractCursor.java:233)
at com.***.****.datalayer.ESCAndroidDataLayer.getUnsentCalls(ESCAndroidDataLayer.java:5340)
at com.***.****.synchall.SynchAll$UnsentSignatureSender.run(SynchAll.java:1750)
再次,上述方法調用一個Thread類,如果有幫助。我發現關於SQLite的鏈接被自動關閉,但我不明白他的解決方案:http://darutk-oboegaki.blogspot.com/2011/03/sqlitedatabase-is-closed-automatically.html
我有一個位置獲取工作的背景,它提取一個位置,然後將其保存到數據庫。我不確定如果這可能會影響我的其他數據庫訪問,如果它巧合同時發生。 – 2013-06-07 01:55:21