Question

我正在为Android开发一个字典应用程序，并希望使用CWAC LoaderEx library来处理SQL grunt工作。我的加载器初始化很好（它使用我在onCreateLoader中指定的SQL语句填充listView），但我无法弄清楚如何重置加载器以使用用户的搜索词运行另一个查询。

我尝试在 onQueryTextChange 中运行 execSQL（），以启动对用户输入的每个字符的搜索：

loader.execSQL(sqlStatement, new String[] { query + "%" });

但该应用程序崩溃时出现以下错误：

03-04 12:10:36.310: E/AndroidRuntime(15293): FATAL EXCEPTION: AsyncTask #4
03-04 12:10:36.310: E/AndroidRuntime(15293): java.lang.RuntimeException: An error occured while executing doInBackground()
03-04 12:10:36.310: E/AndroidRuntime(15293):    at android.os.AsyncTask$3.done(AsyncTask.java:299)
03-04 12:10:36.310: E/AndroidRuntime(15293):    at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:352)
03-04 12:10:36.310: E/AndroidRuntime(15293):    at java.util.concurrent.FutureTask.setException(FutureTask.java:219)
03-04 12:10:36.310: E/AndroidRuntime(15293):    at java.util.concurrent.FutureTask.run(FutureTask.java:239)
03-04 12:10:36.310: E/AndroidRuntime(15293):    at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230)
03-04 12:10:36.310: E/AndroidRuntime(15293):    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1080)
03-04 12:10:36.310: E/AndroidRuntime(15293):    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:573)
03-04 12:10:36.310: E/AndroidRuntime(15293):    at java.lang.Thread.run(Thread.java:856)
* 03-04 12:10:36.310: E/AndroidRuntime(15293): Caused by: android.database.sqlite.SQLiteException: unknown error (code 0): Queries can be performed using SQLiteDatabase query or rawQuery methods only.
03-04 12:10:36.310: E/AndroidRuntime(15293):    at android.database.sqlite.SQLiteConnection.nativeExecuteForChangedRowCount(Native Method)
03-04 12:10:36.310: E/AndroidRuntime(15293):    at android.database.sqlite.SQLiteConnection.executeForChangedRowCount(SQLiteConnection.java:727)
03-04 12:10:36.310: E/AndroidRuntime(15293):    at android.database.sqlite.SQLiteSession.executeForChangedRowCount(SQLiteSession.java:754)
03-04 12:10:36.310: E/AndroidRuntime(15293):    at android.database.sqlite.SQLiteStatement.executeUpdateDelete(SQLiteStatement.java:64)
03-04 12:10:36.310: E/AndroidRuntime(15293):    at android.database.sqlite.SQLiteDatabase.executeSql(SQLiteDatabase.java:1665)
03-04 12:10:36.310: E/AndroidRuntime(15293):    at android.database.sqlite.SQLiteDatabase.execSQL(SQLiteDatabase.java:1644)
03-04 12:10:36.310: E/AndroidRuntime(15293):    at com.commonsware.cwac.loaderex.SQLiteCursorLoader$ExecSQLTask.doInBackground(SQLiteCursorLoader.java:188)
03-04 12:10:36.310: E/AndroidRuntime(15293):    at com.commonsware.cwac.loaderex.SQLiteCursorLoader$ExecSQLTask.doInBackground(SQLiteCursorLoader.java:1)
03-04 12:10:36.310: E/AndroidRuntime(15293):    at android.os.AsyncTask$2.call(AsyncTask.java:287)
03-04 12:10:36.310: E/AndroidRuntime(15293):    at java.util.concurrent.FutureTask.run(FutureTask.java:234)
03-04 12:10:36.310: E/AndroidRuntime(15293):    ... 4 more

根据LoaderEx docs，我应该能够以这种方式使用execSQL来重用现有的SQLiteCursorLoader。我误解了文档吗？我做错了什么？

Answer 1

您的SQL语句显然会返回结果集。 execSQL()上的SQLiteDatabase不允许这样做。这与SQLiteCursorLoader无关。

为什么使用带有SQLiteCursorLoader的execSQL（）会产生AsyncTask致命异常？

1 个答案: