SQLiteReadOnlyDatabaseException:尝试编写只读数据库(代码1032)

Question

所以在一些罕见的情况下,我看到"尝试编写只读数据库"的消息,我无法弄清问题所在.我将从我的logcat中的堆栈跟踪开始...正如您从时间戳中看到的那样,我在尝试写入之前仅检查了db.isReadOnly()1ms.(isOpen = true,readOnly = false)

01-29 13:47:49.115: D/AWT(11055): #479.Got writable database (230537815): isOpen: (true) isReadOnly: (false) inTransaction: (false)
01-29 13:47:49.116: D/AWT(11055): #479.in transaction: Got writable database (230537815): isOpen: (true) isReadOnly: (false) inTransaction: (true)
01-29 13:47:49.116: E/SQLiteLog(11055): (1032) statement aborts at 15: [INSERT INTO Events(col1,col2,col3,col4) VALUES (?,?,?,?)] 
01-29 13:47:49.117: E/SQLiteDatabase(11055): Error inserting data="scrubbed"
01-29 13:47:49.117: E/SQLiteDatabase(11055): android.database.sqlite.SQLiteReadOnlyDatabaseException: attempt to write a readonly database (code 1032)
01-29 13:47:49.117: E/SQLiteDatabase(11055):    at android.database.sqlite.SQLiteConnection.nativeExecuteForLastInsertedRowId(Native Method)
01-29 13:47:49.117: E/SQLiteDatabase(11055):    at android.database.sqlite.SQLiteConnection.executeForLastInsertedRowId(SQLiteConnection.java:780)
01-29 13:47:49.117: E/SQLiteDatabase(11055):    at android.database.sqlite.SQLiteSession.executeForLastInsertedRowId(SQLiteSession.java:788)
01-29 13:47:49.117: E/SQLiteDatabase(11055):    at android.database.sqlite.SQLiteStatement.executeInsert(SQLiteStatement.java:86)
01-29 13:47:49.117: E/SQLiteDatabase(11055):    at android.database.sqlite.SQLiteDatabase.insertWithOnConflict(SQLiteDatabase.java:1471)
01-29 13:47:49.117: E/SQLiteDatabase(11055):    at android.database.sqlite.SQLiteDatabase.insert(SQLiteDatabase.java:1341)
01-29 13:47:49.117: E/SQLiteDatabase(11055):    at com.company.DbHelper.insertBatch(EventsDbHelper.java:174)
01-29 13:47:49.117: D/AWT(11055): #479.finalizing transaction: Got writable database (230537815): isOpen: (true) isReadOnly: (false) inTransaction: (true)
01-29 13:47:49.118: W/SQLiteLog(12120): (28) file unlinked while open: /data/user/0/com.company.app/databases/MyDatabase.db

从我的来源:

public void insertBatch(LinkedList<WriteQueue.DatabaseRecord> writeQueue) throws Exception {
    Log.d("AWT", "EventsDbHelper->insertBatch()");

    if (writeQueue == null) {
        return;
    }

    Iterator<DatabaseRecord> it = writeQueue.iterator();

    SQLiteDatabase db = this.getWritableDatabase();

    Log.d("AWT", String.format("Got writable database (%s): isOpen: (%s) isReadOnly: (%s) inTransaction: (%s)",
            db.hashCode(), db.isOpen(), db.isReadOnly(), db.inTransaction()));

    try {
        db.beginTransaction();

        while (it.hasNext()) {
            DatabaseRecord record = it.next();

            ContentValues initialValues = new ContentValues();
            initialValues.put(col1, val1);
            initialValues.put(col2, val2);
            initialValues.put(col3, val3);
            initialValues.put(col4, val4);

            Log.d("AWT", String.format("in transaction: Got writable database (%s): isOpen: (%s) isReadOnly: (%s) inTransaction: (%s)",
                    db.hashCode(), db.isOpen(), db.isReadOnly(), db.inTransaction()));

            db.insert(DBTBL, null, initialValues);
        }
        Log.d("AWT", String.format("finalizing transaction: Got writable database (%s): isOpen: (%s) isReadOnly: (%s) inTransaction: (%s)",
                db.hashCode(), db.isOpen(), db.isReadOnly(), db.inTransaction()));
        db.setTransactionSuccessful();

    } catch (Exception e) {
        Log.e(TAG, "Error inserting batch record into database.", e);
    } finally {
        try {
            db.endTransaction();
            db.close();
        } catch (Exception e) {
            Log.e(TAG, Global.DB_ERROR, e);
        }
    }
}

所以我认为可能发生了两件事之一.

1. 在检查和尝试的批量插入之间的1ms内,DB确实被关闭/设置为"只读".
2. isReadOnly对我说谎,而不是准确报告数据库的状态.
3. 我的插入中途正在删除数据库!请参阅上面日志的最后一行.我打开了针对SQLite的严格日志记录并注意到了上述内容.我怀疑第三方库可能正在丢弃我的所有数据库.

虽然在这一点上有想法,但我愿意尝试任何建议.

Answer 1

乍一看，其根本原因似乎是第三方库。除非我弄错了，否则 Mobeix 的 Tagit 会在应用程序启动时删除数据库。我添加了一些详细的 SQLite 日志记录，包括这些策略：

StrictMode.setVmPolicy(new StrictMode.VmPolicy.Builder()
    .detectLeakedSqlLiteObjects()
    .detectLeakedClosableObjects()
    .penaltyLog()
    .penaltyDeath()
    .build());

我在日志中注意到我的数据库在创建并打开后被取消链接。更详细的日志记录表明它发生在 Mobeix 库初始化时。有问题的违规行：

01-29 13:47:49.118: W/SQLiteLog(12120): (28) file unlinked while open: /data/user/0/com.company.app/databases/MyDatabase.db

所以我的数据库文件未链接。诡异的。下一次调用 getWritableDatabase() 会再次重新创建它，然后一切都很好，直到应用程序被终止并重新启动，此时它被删除并重新创建。

如果我弄清楚导致取消链接的确切原因，我会更新此内容。