标签: android-sqlite

我想在sdcard或外部SD卡中创建数据库为此我已经尝试了这个代码并使用这个我已经在SD卡中成功创建了数据库,但在logcat中它给了我如下警告

logcat的

07-18 14:18:22.140:W/FileUtils(8595):chmod失败(/ mnt/sdcard/peakmedia/DB_PMD):libcore.io.ErrnoException:chmod failed:EPERM(不允许操作)

DB_Helper.java

public class DB_Helper extends SQLiteOpenHelper
{

    public DB_Helper(Context context) 
    {   
        super(context, Environment.getExternalStorageDirectory().getAbsolutePath() 
                       + File.separator + DB_Constant.DB.FILE_DIR 
                       + File.separator + DB_Constant.DB.DATABASENAME, null, DB_Constant.DB.DB_VERSION);

    }

    @Override
    public void onCreate(SQLiteDatabase db) 
    {
        String  query=String.format(DB_Constant.CREATE_TABLE_QUERY.CREATE_MYFILES_TABLE);
        db.execSQL(query);


        query=String.format(DB_Constant.CREATE_TABLE_QUERY.CREATE_MYUSERS_TABLE);
        db.execSQL(query);

        query=String.format(DB_Constant.CREATE_TABLE_QUERY.CREATE_MYPLAYLIST_TABLE);
        db.execSQL(query);

        query=String.format(DB_Constant.CREATE_TABLE_QUERY.CREATE_MYDEVICE_TABLE);
        db.execSQL(query);

    }

     @Override
     public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) 
     {
            if(newVersion > oldVersion)
            {   

                db.execSQL("DROP TABLE IF EXISTS "+ DB_Constant.TABLE.MYFILES);
                onCreate(db);

                db.execSQL("DROP TABLE IF EXISTS "+ DB_Constant.TABLE.MYUSERS);
                onCreate(db);

                db.execSQL("DROP TABLE IF EXISTS "+ DB_Constant.TABLE.MYPLAYLIST); …

我最近更新了我的一个应用程序,在极少数情况下我得到了上述错误.仅当用户尝试通过现有应用程序更新应用程序时,才会出现此错误.这不会发生在每次和每台设备上.我在Android SQLiteException上发现了类似的问题:无法将db的语言环境更改为'en_US'但是回复并没有解决我的问题.我一直试图通过一个小小的方式来解决这个问题而且我失败了.我使用过SQLiteDatabase,因此我没有给出任何数据库路径.崩溃报告如下

android.database.sqlite.SQLiteException: Failed to change locale for db '/data/data/com.scoreup/databases/scoreUp' to 'en_US'.
0
android.database.sqlite.SQLiteConnection.setLocaleFromConfiguration
SQLiteConnection.java:393
1
android.database.sqlite.SQLiteConnection.open
SQLiteConnection.java:218
2
android.database.sqlite.SQLiteConnection.open
SQLiteConnection.java:193
3
android.database.sqlite.SQLiteConnectionPool.openConnectionLocked
SQLiteConnectionPool.java:463
4
android.database.sqlite.SQLiteConnectionPool.open
SQLiteConnectionPool.java:185
5
android.database.sqlite.SQLiteConnectionPool.open
SQLiteConnectionPool.java:177
6
android.database.sqlite.SQLiteDatabase.openInner
SQLiteDatabase.java:806
7
android.database.sqlite.SQLiteDatabase.open
SQLiteDatabase.java:791
8
android.database.sqlite.SQLiteDatabase.openDatabase
SQLiteDatabase.java:694
9
android.app.ContextImpl.openOrCreateDatabase
ContextImpl.java:1148
10
android.content.ContextWrapper.openOrCreateDatabase
ContextWrapper.java:268
11
android.database.sqlite.SQLiteOpenHelper.getDatabaseLocked
SQLiteOpenHelper.java:223
12
android.database.sqlite.SQLiteOpenHelper.getWritableDatabase
SQLiteOpenHelper.java:163
13
com.scoreup.gson.DatabaseHandler.openDatabase
DatabaseHandler.java:35
14
com.scoreup.gson.DatabaseHandler.getQuizBots
DatabaseHandler.java:379
15
com.scoreup.activity.earn.fragments.EarnScreenBottomFragmentWinners.onCreateView
EarnScreenBottomFragmentWinners.java:66
16
android.app.Fragment.performCreateView
Fragment.java:2053
17
android.app.FragmentManagerImpl.moveToState
FragmentManager.java:894
18
android.app.FragmentManagerImpl.moveToState
FragmentManager.java:1067
19
android.app.BackStackRecord.run
BackStackRecord.java:834
20
android.app.FragmentManagerImpl.execPendingActions
FragmentManager.java:1452
21 …