SQLiteBlobTooBigException：行太大而无法容纳CursorWindow requiredPos = 0，totalRows = 1

Question

我只在android 9中遇到异常，重新安装一切看起来不错之后，

例外：

android.database.sqlite.SQLiteBlobTooBigException: Row too big to fit into CursorWindow requiredPos=0, totalRows=1...

码：

Cursor cursor = database.query(......);
    if(cursor == null || cursor.getCount() < 0) { //Here is the error
        Log.d("Error", "count : null");
        return "";
    }

编辑：

java.lang.RuntimeException: An error occurred while executing doInBackground()
at android.os.AsyncTask$3.done(AsyncTask.java:354)
at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:383)
at java.util.concurrent.FutureTask.setException(FutureTask.java:252)
at java.util.concurrent.FutureTask.run(FutureTask.java:271)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
at java.lang.Thread.run(Thread.java:764)

Caused by: android.database.sqlite.SQLiteBlobTooBigException: Row too big to fit into CursorWindow requiredPos=0, totalRows=1
at android.database.sqlite.SQLiteConnection.nativeExecuteForCursorWindow(Native Method)
at android.database.sqlite.SQLiteConnection.executeForCursorWindow(SQLiteConnection.java:859)
at android.database.sqlite.SQLiteSession.executeForCursorWindow(SQLiteSession.java:836)
at android.database.sqlite.SQLiteQuery.fillWindow(SQLiteQuery.java:62)
at android.database.sqlite.SQLiteCursor.fillWindow(SQLiteCursor.java:149)
at android.database.sqlite.SQLiteCursor.getCount(SQLiteCursor.java:137)

在此先感谢大家

Answer 1

这对我有用，你必须把它放在你的主要活动中。

try {
    Field field = CursorWindow.class.getDeclaredField("sCursorWindowSize");
    field.setAccessible(true);
    field.set(null, 100 * 1024 * 1024); //the 100MB is the new size
    } catch (Exception e) {
       e.printStackTrace();
    }

Answer 2

尝试 API 28 之上的这个新构造函数。也许您应该为 CursorWindow 设置一个有限的 windowSizeBytes 并尝试捕获异常。

\n\n

相关cts代码（https://android.googlesource.com/platform/cts/+/master/tests/tests/database/src/android/database/sqlite/cts/SQLiteCursorTest.java）：

\n\n

    public void testRowTooBig() {\n        mDatabase.execSQL("CREATE TABLE Tst (Txt BLOB NOT NULL);");\n        byte[] testArr = new byte[10000];\n        Arrays.fill(testArr, (byte) 1);\n        for (int i = 0; i < 10; i++) {\n            mDatabase.execSQL("INSERT INTO Tst VALUES (?)", new Object[]{testArr});\n        }\n        // Now reduce window size, so that no rows can fit\n        Cursor cursor = mDatabase.rawQuery("SELECT * FROM TST", null);\n        CursorWindow cw = new CursorWindow("test", 5000);\n        AbstractWindowedCursor ac = (AbstractWindowedCursor) cursor;\n        ac.setWindow(cw);\n        try {\n            ac.moveToNext();\n            fail("Exception is expected when row exceeds CursorWindow size");\n        } catch (SQLiteBlobTooBigException expected) {\n        }\n    }\n

\n\n

其他的：

\n\n

\n

由于本文最初发布，我们\xe2\x80\x99 在 Android P 开发者预览版中添加了新的 API，以改进上述行为。该平台现在允许应用禁用窗口启发式的 \xe2\x85\x93 并\n 配置 CursorWindow 大小。

\n

\n\n

参考链接：\n https://medium.com/androiddevelopers/large-database-queries-on-android-cb043ae626e8

\n