我正在创建一个数据库导出器库。我从提供的上下文中获取整个数据库
mContext.databaseList() //return String[] of databases
然后使用循环
获取每个数据库 File databasePath = mContext.getDatabasePath(databaseName);
SQLiteDatabase db = SQLiteDatabase.openDatabase(databasePath.getAbsolutePath(), null, 0);
出于测试目的，我使用了一个实时项目，然后我注意到一个我没有创建的数据库叫做
SLM_B.db-journal.back.back.back.back.back.back.back.back.back.back.back.back.back.back.back.back.back.back.back.back.back.back.back.back.back.back.back.back.back.back.back.back.back.back.back.back.back.back.back.back.back.back.back.back.back.back.back
当我尝试打开这个数据库时，我遇到了这个问题。
Failed to open database '/data/user/0/com.samsung.lighting/databases/SLM_B.db-journal.back.back.back.back.back.back.back.back.back.back.back.back.back.back.back.back.back.back.back.back.back.back.back.back.back.back.back.back.back.back.back.back.back.back.back.back.back.back.back.back.back.back.back.back.back.back.back'.
android.database.sqlite.SQLiteDatabaseCorruptException: file is encrypted or is not a database (code 26): , while compiling: PRAGMA journal_mode
#################################################################
Error Code : 26 (SQLITE_NOTADB)
Caused By : File opened that is not a database file or encrypted.
(file is encrypted or is not a database (code 26): , while compiling: PRAGMA journal_mode)
#################################################################
at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method)
at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:1009)
at android.database.sqlite.SQLiteConnection.executeForString(SQLiteConnection.java:713)
at android.database.sqlite.SQLiteConnection.setJournalMode(SQLiteConnection.java:387)
at android.database.sqlite.SQLiteConnection.setWalModeFromConfiguration(SQLiteConnection.java:361)
at android.database.sqlite.SQLiteConnection.open(SQLiteConnection.java:250)
at android.database.sqlite.SQLiteConnection.open(SQLiteConnection.java:201)
at android.database.sqlite.SQLiteConnectionPool.openConnectionLocked(SQLiteConnectionPool.java:514)
at android.database.sqlite.SQLiteConnectionPool.open(SQLiteConnectionPool.java:206)
at android.database.sqlite.SQLiteConnectionPool.open(SQLiteConnectionPool.java:178)
at android.database.sqlite.SQLiteDatabase.openInner(SQLiteDatabase.java:934)
at android.database.sqlite.SQLiteDatabase.open(SQLiteDatabase.java:898)
at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:708)
at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:683)
at com.godwin.databasedebugger.DatabaseExporter.exportDB(DatabaseExporter.java:41)
at com.godwin.databasedebugger.TableListFragment.exportDatabase(TableListFragment.java:55)
at com.godwin.databasedebugger.TableListFragment.onViewCreated(TableListFragment.java:50)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1314)
at android.support.v4.app.FragmentManagerImpl.moveFragmentToExpectedState(FragmentManager.java:1528)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1595)
at android.support.v4.app.BackStackRecord.executeOps(BackStackRecord.java:758)
at android.support.v4.app.FragmentManagerImpl.executeOps(FragmentManager.java:2363)
at android.support.v4.app.FragmentManagerImpl.executeOpsTogether(FragmentManager.java:2149)
at android.support.v4.app.FragmentManagerImpl.optimizeAndExecuteOps(FragmentManager.java:2103)
at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:2013)
at android.support.v4.app.FragmentController.execPendingActions(FragmentController.java:388)
at android.support.v4.app.FragmentActivity.onStart(FragmentActivity.java:607)
at android.support.v7.app.AppCompatActivity.onStart(AppCompatActivity.java:178)
at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1266)
at android.app.Activity.performStart(Activity.java:6943)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3277)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3416)
at android.app.ActivityThread.access$1100(ActivityThread.java:230)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1822)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:7409)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)
08-27 19:24:32.801 E: file is encrypted or is not a database (code 26): , while compiling: PRAGMA journal_mode
#################################################################
Error Code : 26 (SQLITE_NOTADB)
Caused By : File opened that is not a database file or encrypted.
(file is encrypted or is not a database (code 26): , while compiling: PRAGMA journal_mode)
#################################################################
android.database.sqlite.SQLiteDatabaseCorruptException: file is encrypted or is not a database (code 26): , while compiling: PRAGMA journal_mode
#################################################################
Error Code : 26 (SQLITE_NOTADB)
Caused By : File opened that is not a database file or encrypted.
(file is encrypted or is not a database (code 26): , while compiling: PRAGMA journal_mode)
#################################################################
at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method)
at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:1009)
at android.database.sqlite.SQLiteConnection.executeForString(SQLiteConnection.java:713)
at android.database.sqlite.SQLiteConnection.setJournalMode(SQLiteConnection.java:387)
at android.database.sqlite.SQLiteConnection.setWalModeFromConfiguration(SQLiteConnection.java:361)
at android.database.sqlite.SQLiteConnection.open(SQLiteConnection.java:250)
at android.database.sqlite.SQLiteConnection.open(SQLiteConnection.java:201)
at android.database.sqlite.SQLiteConnectionPool.openConnectionLocked(SQLiteConnectionPool.java:514)
at android.database.sqlite.SQLiteConnectionPool.open(SQLiteConnectionPool.java:206)
at android.database.sqlite.SQLiteConnectionPool.open(SQLiteConnectionPool.java:178)
at android.database.sqlite.SQLiteDatabase.openInner(SQLiteDatabase.java:934)
at android.database.sqlite.SQLiteDatabase.open(SQLiteDatabase.java:898)
at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:708)
at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:683)
at com.godwin.databasedebugger.DatabaseExporter.exportDB(DatabaseExporter.java:41)
at com.godwin.databasedebugger.TableListFragment.exportDatabase(TableListFragment.java:55)
at com.godwin.databasedebugger.TableListFragment.onViewCreated(TableListFragment.java:50)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1314)
at android.support.v4.app.FragmentManagerImpl.moveFragmentToExpectedState(FragmentManager.java:1528)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1595)
at android.support.v4.app.BackStackRecord.executeOps(BackStackRecord.java:758)
at android.support.v4.app.FragmentManagerImpl.executeOps(FragmentManager.java:2363)
at android.support.v4.app.FragmentManagerImpl.executeOpsTogether(FragmentManager.java:2149)
at android.support.v4.app.FragmentManagerImpl.optimizeAndExecuteOps(FragmentManager.java:2103)
at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:2013)
at android.support.v4.app.FragmentController.execPendingActions(FragmentController.java:388)
at android.support.v4.app.FragmentActivity.onStart(FragmentActivity.java:607)
at android.support.v7.app.AppCompatActivity.onStart(AppCompatActivity.java:178)
at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1266)
at android.app.Activity.performStart(Activity.java:6943)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3277)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3416)
at android.app.ActivityThread.access$1100(ActivityThread.java:230)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1822)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:7409)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
at com.andr
我的问题是
- 为什么这个数据库？
- 其他类型的应用程序是否有类似的内容？
- 如何避免这种情况？ （比字符串比较）
- 如何加密或解密自己的数据库？