在一些罕见的情况下，我看到了“尝试写只读数据库”的消息，但我无法确定问题出在哪里。我会从我的logcat堆栈跟踪开始...正如您可以从时间戳中看到的那样，我仅在尝试写入之前1毫秒检查db.isReadOnly()。（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
根据我的消息来源：
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);
}
}
}
所以我认为可能是以下两种情况之一正在发生：
- 在检查和尝试批量插入之间的1ms内，DB确实被关闭/设置为“只读”。
- isReadOnly欺骗了我，并没有准确报告数据库的状态。
- 数据库在我的插入过程中被删除！请查看上面日志的最后一行。我打开了SQLite的严格日志记录，并注意到了上述情况。我怀疑第三方库可能会删除我的所有数据库。
到这一步为止我已经没有想法了，但我愿意尝试任何建议。