使用后续查询时无法打开数据库文件错误

使用后续查询时无法打开数据库文件错误

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问题描述

我有以下代码,第一个游标对象工作正常,但当我做另一个查询并将其分配给flightCursor,它给出错误。

  Cursor cursor = database.query(CityAndAirportsTable.notificationsTable,new String [] {CityAndAirportsTable.notifyFlightId},
null,null,null,null,Id DESC);
cursor.moveToFirst();
while(!cursor.isAfterLast()){
String id = String.valueOf(cursor.getInt(0));
Cursor flightCursor = database.query(CityAndAirportsTable.flightTable,new String [] {CityAndAirportsTable.fromDestinationCode,
CityAndAirportsTable.toDestinationCode,CityAndAirportsTable.currentPrice},CityAndAirportsTable.flightId +=+ id,
null,null,null,null);
}

这里在flightCursor = database.query,我得到错误。 p>

日志

  03-27 23:49:09.628:E / SQLiteLog (2296):(14)无法在[9491ba7d73]的行30046打开文件
03-27 23:49:09.628:E / SQLiteLog(2296):(14)os_unix.c:30046: (/data/data/com.flightapp.myapp/databases/Application_DB-journal) -
03-27 23:49:09.628:E / SQLiteLog(2296):(14)无法打开文件在第30046行[ 9491ba7d73]
03-27 23:49:09.628:E / SQLiteLog(2296):(14)os_unix.c:30046:(24)open(/data/data/com.flightapp.myapp/databases/Application_DB -journal) -
03-27 23:49:09.628:E / SQLiteLog(2296):(14)语句在11处中止:[SELECT FROM_Destination_Code,To_Destination_Code,Current_Price FROM Flights WHERE Id = 2]无法打开数据库文件
03-27 23:49:09.629:E / SQLiteQuery(2296):异常:无法打开数据库文件(代码14)。查询:SELECT From_Destination_Code,To_Destination_Code,Current_Price FROM Flights WHERE Id = 2

但在我的情况下,第一个查询工作,但第二个失败。

解决方案

完成后关闭光标!我想你只有太多的游标对象打开了

  Cursor cursor = database.query(CityAndAirportsTable.notificationsTable,new String [ ] {CityAndAirportsTable.notifyFlightId},
null,null,null,null,Id DESC);
cursor.moveToFirst();
while(!cursor.isAfterLast()){
String id = String.valueOf(cursor.getInt(0));
Cursor flightCursor = database.query(
CityAndAirportsTable.flightTable,
new String [] {CityAndAirportsTable.fromDestinationCode,
CityAndAirportsTable.toDestinationCode,
CityAndAirportsTable.currentPrice},
CityAndAirportsTable.flightId +=+ id,
null,null,null,null);

/ *在这里关闭光标! * /
flightCursor.close();
/ * ---------------------- * /
}

希望这可以修复您的问题


I have the following code, the first cursor object works fine, but when i do another query and assign it to the flightCursor, it gives the error.

Cursor cursor = database.query( CityAndAirportsTable.notificationsTable, new String[] { CityAndAirportsTable.notifyFlightId },
                null, null, null, null, "Id DESC" );
        cursor.moveToFirst();
        while( !cursor.isAfterLast() ){
            String id = String.valueOf( cursor.getInt( 0 ) );
            Cursor flightCursor = database.query( CityAndAirportsTable.flightTable, new String[] { CityAndAirportsTable.fromDestinationCode,
            CityAndAirportsTable.toDestinationCode, CityAndAirportsTable.currentPrice }, CityAndAirportsTable.flightId + "=" + id,
                    null, null, null, null );
}

Here in the flightCursor = database.query, i get the error.

Logs

03-27 23:49:09.628: E/SQLiteLog(2296): (14) cannot open file at line 30046 of [9491ba7d73]
03-27 23:49:09.628: E/SQLiteLog(2296): (14) os_unix.c:30046: (24) open(/data/data/com.flightapp.myapp/databases/Application_DB-journal) -
03-27 23:49:09.628: E/SQLiteLog(2296): (14) cannot open file at line 30046 of [9491ba7d73]
03-27 23:49:09.628: E/SQLiteLog(2296): (14) os_unix.c:30046: (24) open(/data/data/com.flightapp.myapp/databases/Application_DB-journal) -
03-27 23:49:09.628: E/SQLiteLog(2296): (14) statement aborts at 11: [SELECT From_Destination_Code, To_Destination_Code, Current_Price FROM Flights WHERE Id=2] unable to open database file
03-27 23:49:09.629: E/SQLiteQuery(2296): exception: unable to open database file (code 14); query: SELECT From_Destination_Code, To_Destination_Code, Current_Price FROM Flights WHERE Id=2

There are similar question on stackoverflow, but in my case the first query works but the second one fails.

解决方案

Close your cursor when you're done with it! I think you've just got too many cursor objects open

Cursor cursor = database.query( CityAndAirportsTable.notificationsTable, new String[] { CityAndAirportsTable.notifyFlightId },
                null, null, null, null, "Id DESC" );
cursor.moveToFirst();
while( !cursor.isAfterLast() ){
  String id = String.valueOf( cursor.getInt( 0 ) );
  Cursor flightCursor = database.query(
    CityAndAirportsTable.flightTable,
    new String[] { CityAndAirportsTable.fromDestinationCode,
      CityAndAirportsTable.toDestinationCode,
      CityAndAirportsTable.currentPrice },
    CityAndAirportsTable.flightId + "=" + id,
    null, null, null, null );

  /* Close the cursor here! */
  flightCursor.close();
  /* ---------------------- */
}

Hopefully this fixes your issue

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09-03 06:12