로컬 SQLite 데이터베이스에서 긴 삭제 작업을 수행하는 AsyncTask를 실행할 때 문제가 있습니다. 사용자가 화면을 회전하면 AsyncTask가 실행되는 동안 Activity가 다시 작성되고 데이터베이스에 대한 새 연결이 만들어집니다. ...Android SQLite의 동시성 문제
내가 SQLite는 한 번에 여러 읽기와 하나 개 쓰기를 지원하는지 알고, 이것은 삭제가 수행되는 동안로 읽을 수있는 데이터베이스를 열 때 충돌이 왜 그렇게 이해하지 않는 경우 것
실패는 다음과 같습니다
04-26 12:54:21.839: I/Database(3925): sqlite returned: error code = 5, msg = database is locked
04-26 12:54:21.839: E/Database(3925): SELECT locale FROM android_metadata failed
04-26 12:54:21.839: E/Database(3925): Failed to setLocale() when constructing, closing the database
04-26 12:54:21.839: E/Database(3925): android.database.sqlite.SQLiteException: database is locked
04-26 12:54:21.839: E/Database(3925): at android.database.sqlite.SQLiteDatabase.native_setLocale(Native Method)
04-26 12:54:21.839: E/Database(3925): at android.database.sqlite.SQLiteDatabase.setLocale(SQLiteDatabase.java:1967)
04-26 12:54:21.839: E/Database(3925): at android.database.sqlite.SQLiteDatabase.<init>(SQLiteDatabase.java:1835)
04-26 12:54:21.839: E/Database(3925): at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:820)
04-26 12:54:21.839: E/Database(3925): at android.database.sqlite.SQLiteOpenHelper.getReadableDatabase(SQLiteOpenHelper.java:197)
04-26 12:54:21.839: E/Database(3925): at com.caumons.trainingdininghall.persistence.DatabaseManager.openReadableDatabaseWithForeignKeySupport(DatabaseManager.java:172)
04-26 12:54:21.839: E/Database(3925): at com.caumons.trainingdininghall.persistence.DatabaseManager.openReadableDatabaseWithForeignKeySupport(DatabaseManager.java:180)
04-26 12:54:21.839: E/Database(3925): at com.caumons.trainingdininghall.persistence.DatabaseManager.openReadableDatabaseWithForeignKeySupport(DatabaseManager.java:180)
04-26 12:54:21.839: E/Database(3925): at com.caumons.trainingdininghall.persistence.DatabaseManager.openReadableDatabaseWithForeignKeySupport(DatabaseManager.java:180)
04-26 12:54:21.839: E/Database(3925): at com.caumons.trainingdininghall.persistence.DatabaseManager.openReadableDatabaseWithForeignKeySupport(DatabaseManager.java:180)
04-26 12:54:21.839: E/Database(3925): at com.caumons.trainingdininghall.persistence.DatabaseManager.openReadableDatabaseWithForeignKeySupport(DatabaseManager.java:180)
04-26 12:54:21.839: E/Database(3925): at com.caumons.trainingdininghall.persistence.DatabaseManager.openReadableDatabaseWithForeignKeySupport(DatabaseManager.java:180)
04-26 12:54:21.839: E/Database(3925): at com.caumons.trainingdininghall.persistence.DatabaseManager.openReadableDatabaseWithForeignKeySupport(DatabaseManager.java:180)
04-26 12:54:21.839: E/Database(3925): at com.caumons.trainingdininghall.persistence.DatabaseManager.openReadableDatabaseWithForeignKeySupport(DatabaseManager.java:180)
04-26 12:54:21.839: E/Database(3925): at com.caumons.trainingdininghall.persistence.DatabaseManager.openReadableDatabaseWithForeignKeySupport(DatabaseManager.java:180)
04-26 12:54:21.839: E/Database(3925): at com.caumons.trainingdininghall.persistence.DatabaseManager.open(DatabaseManager.java:157)
04-26 12:54:21.839: E/Database(3925): at com.caumons.trainingdininghall.persistence.DatabaseManager.<init>(DatabaseManager.java:147)
04-26 12:54:21.839: E/Database(3925): at com.caumons.trainingdininghall.openerp.models.ConnectionProfile$ConnectionProfileManager.<init>(ConnectionProfile.java:138)
04-26 12:54:21.839: E/Database(3925): at com.caumons.trainingdininghall.activities.SelectConnectionProfile.fillData(SelectConnectionProfile.java:71)
04-26 12:54:21.839: E/Database(3925): at com.caumons.trainingdininghall.activities.SelectConnectionProfile.onResume(SelectConnectionProfile.java:66)
04-26 12:54:21.839: E/Database(3925): at android.app.Instrumentation.callActivityOnResume(Instrumentation.java:1149)
04-26 12:54:21.839: E/Database(3925): at android.app.Activity.performResume(Activity.java:3833)
04-26 12:54:21.839: E/Database(3925): at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2085)
04-26 12:54:21.839: E/Database(3925): at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:2110)
04-26 12:54:21.839: E/Database(3925): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1643)
04-26 12:54:21.839: E/Database(3925): at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:2796)
04-26 12:54:21.839: E/Database(3925): at android.app.ActivityThread.access$1600(ActivityThread.java:117)
04-26 12:54:21.839: E/Database(3925): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:932)
04-26 12:54:21.839: E/Database(3925): at android.os.Handler.dispatchMessage(Handler.java:99)
04-26 12:54:21.839: E/Database(3925): at android.os.Looper.loop(Looper.java:123)
04-26 12:54:21.839: E/Database(3925): at android.app.ActivityThread.main(ActivityThread.java:3647)
04-26 12:54:21.839: E/Database(3925): at java.lang.reflect.Method.invokeNative(Native Method)
04-26 12:54:21.839: E/Database(3925): at java.lang.reflect.Method.invoke(Method.java:507)
04-26 12:54:21.839: E/Database(3925): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
04-26 12:54:21.839: E/Database(3925): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
04-26 12:54:21.839: E/Database(3925): at dalvik.system.NativeStart.main(Native Method)
내가 다음 해결 방법을 코딩,하지만 난이 매우 정중 아니라고 생각 :
private void openReadableDatabaseWithForeignKeySupport() {
try {
mDatabase = mDatabaseHelper.getReadableDatabase();
mDatabase.execSQL("PRAGMA foreign_keys = ON");
} catch (SQLiteException e) {
/*
* If there is an exception because the database is locked,
* we will retry until it is free and can be opened.
* */
Log.d(getClass().getName(), e.toString());
openReadableDatabaseWithForeignKeySupport(); // Recursive call
}
}
,
가장 호기심은 실패 할 것 같다 무엇 안드로이드에 의해 자동으로 호출 setLocale()
방법이다, 그러나 docs는 말한다 :
로 setLocale()이 데이터베이스에 대한 로케일을 설정합니다. 이 데이터베이스에 NO_LOCALIZED_COLLATORS 플래그가 설정되어 있거나 읽기 전용으로 열린 경우 아무 것도 수행하지 않습니다.
도움이 될 것입니다. :)
이 질문을 확인하십시오 : [SQLite 예외 : 데이터베이스 잠김 문제] (http://stackoverflow.com/questions/7657223/sqlite-exception-database-is-locked-issue) –
또한 회전 할 때 활동을 재현하지 않으려면 android : configChanges = "keyboardHidden | orientation"을 AndroidManifest.xml의 활동 정의에 추가 할 수 있습니다. – DustinB