Question

我制作了一个使用数据库的Kiosk应用。该应用程序一直在前台运行。该应用程序有许多使用一个共享DataBaseHelper实例的线程。该应用程序完美无缺，但大多数时间在5或6小时后，我遇到这些异常然后应用程序崩溃：

E / DataBaseHelper：2048 kb的光标窗口分配失败。＃打开   游标= 1（此proc = 1打开的＃游标）

E / CursorWindow：无法分配CursorWindow   ＆＃39; /data/user/0/com.kios.frm/databases/YadProjectDB.db'的   尺寸2097152，由于错误-24。

E / SQLiteLog：（14）无法打开[00bb9c9ce4]第30192行的文件

E / SQLiteLog：（14）语句在16处中止：[SELECT number FROM sms   LIMIT 5]无法打开数据库文件

E / SQLiteQuery：异常：无法打开数据库文件（代码14）;
  查询：SELECT编号FROM sms LIMIT 5

E / SQLiteLog：（14）os_unix.c：30192：（24）
  开放（/data/user/0/com.kiosk.frm/databases/YadProjectDB.db-journal） -

我正确关闭了游标但仍然获得了这些异常。那些例外是什么？这些例外的原因是什么？

MainActivity

private DataBaseHelper db = null; // Global

MainActivity onCreate方法：

db = new DataBaseHelper(this);

new Thread(new Runnable() {
@Override
public void run() {
    while (threadRunningFlag) {

    Cursor result = null;
    try {

        result = db.getData("SELECT " + DataBaseHelper.SMS_COLUMN_PHONE_NUMBER  + " FROM " + DataBaseHelper.SMS_TABLE_NAME + " LIMIT 5");
        if (result != null && result.getCount() > 0) {
            while (!result.isAfterLast()) {
                String phoneNumber = result.getString(result.getColumnIndex(DataBaseHelper.SMS_COLUMN_PHONE_NUMBER));
                // ...
                result.moveToNext();
            }
        }
    }catch (Exception e) {
        Log.e(TAG, "err->" + e.getLocalizedMessage());

    }finally {
        if (result != null) {
            result.close();
            result = null;
        }
    }

        try {
            Thread.sleep(1000);
        } catch (InterruptedException e) {
            Log.e(TAG, e.getMessage());
        }
    }
}
}).start();

DataBaseHelper类：

public class DataBaseHelper extends SQLiteOpenHelper {

    private static final int DATABASE_VERSION = 1;
    public static final String DATABASE_NAME = "YadProjectDB.db";
    public static final String SMS_TABLE_NAME = "sms";
    public static final String SMS_COLUMN_PHONE_NUMBER = "number";
    public static final String SMS_COLUMN_SMS_TEXT = "message";

    public static final String BLACK_LIST_TABLE_NAME = "blackList";
    public static final String BLACK_LIST_COLUMN_ID = "id";
    public static final String BLACK_LIST_COLUMN_PHONE_NUMBER = "number";

    private final String TAG = "DataBaseHelper";

    public DataBaseHelper(Context context) {
        super(context, DATABASE_NAME, null, DATABASE_VERSION);

    }

    @Override
    public void onCreate( SQLiteDatabase db ) {
        String command = "CREATE TABLE "
                + SMS_TABLE_NAME
                + "("
                + SMS_COLUMN_PHONE_NUMBER + " TEXT,"
                + SMS_COLUMN_SMS_TEXT + " TEXT,"
                + ")";
        try {
            db.execSQL(command);
        }catch (Exception e) {
            Log.e(TAG, "err->" + e.getMessage());
        }

        command = "CREATE TABLE "
                + BLACK_LIST_TABLE_NAME
                + "("
                + BLACK_LIST_COLUMN_PHONE_NUMBER + " TEXT,"
                + ")";
        try {
            db.execSQL(command);
        }catch (Exception e) {
            Log.e(TAG, "err->" +  e.getMessage());
        }
    }

    public boolean insertToSms(String number, String message, String fileName, Integer uploadFlag, Integer blackList, Integer pictureFlag)
    {
        final SQLiteDatabase db = this.getWritableDatabase();
        ContentValues contentValues = new ContentValues();
        contentValues.put(SMS_COLUMN_PHONE_NUMBER, number);
        contentValues.put(SMS_COLUMN_SMS_TEXT, message);
        try {
            db.insert(SMS_TABLE_NAME, null, contentValues);
            return true;
        }catch (Exception e) {
            Log.e(TAG, "err->" + e.getMessage());
            return false;
        }
    }

    public Cursor getData(String query){
        final SQLiteDatabase db = getReadableDatabase();
        Cursor res = null;
        try {
            res = db.rawQuery(query, null);
            res.moveToFirst();
            return res;
        }catch (Exception e) {
            Log.e(TAG, "err->" + e.getMessage());
            if (res != null) {
                res.close();
                res = null;
            }
        }
        return null;
    }
}

Answer 1

这看起来与SQLite Android Database Cursor window allocation of 2048 kb failed

相同

您的错误说：“打开游标”

上述问题的答案解释了：

此错误的原因通常是非关闭游标。确保在使用它们之后关闭所有游标（即使出现错误）。

Cursor cursor = null;
try {
    cursor = db.query(...
    // do some work with the cursor here.
} finally {
    // this gets called even if there is an exception somewhere above
    if(cursor != null)
        cursor.close();
}

光标窗口分配2048 kb失败。 #Open Cursors = 1（此proc = 1打开的#rsrsors）

1 个答案: