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答案是在這個線程:Sqlite issues with HTC Desire HD,感謝@Vikalp帕特爾打開SQLite數據庫 - 沒有這樣的文件或目錄
我這樣做真的簡單的事情 - 從SD卡打開SQLite數據庫和閱讀一些東西從它。例如表的列表:
這是我DataBaseHelper類(真的簡單):
public class DataBaseHelper extends SQLiteOpenHelper{
static Context mContext;
private static SQLiteDatabase mDb;
public DataBaseHelper(Context context, String name, CursorFactory factory, int version) {
super(context, name, factory, version);
mContext = context;
}
//skip the overriden methods
public void OpenDataBase(String path, String name){
mDb = SQLiteDatabase.openDatabase(path + name, null, SQLiteDatabase.NO_LOCALIZED_COLLATORS);
}
public Cursor GetTables(){
return mDb.rawQuery("SELECT name FROM sqlite_master WHERE type='table' ORDER BY name", null);
}
}
當我把這個代碼
mDbPath = Environment.getExternalStorageDirectory() + "/test_db/";
mDbName = "db.sqlite";
mDbHelper = new DataBaseHelper(mContext,mDbPath+mDbName,null,1);
mDbHelper.OpenDataBase(mDbPath, mDbName);
Toast.makeText(mContext, String.format("Database %s%s successfully opened", new Object[]{mDbPath, mDbName}), Toast.LENGTH_LONG).show();
Cursor cursor = mDbHelper.GetTables();
返回遊標包含表的列表。有用。這讓我瘋狂的唯一事情是在日誌中的錯誤消息:
01-05 17:09:44.250: D/Database(21131): dbopen(): path = /mnt/sdcard/test_db/db.sqlite, flag = 2, file size = 3072
01-05 17:09:44.260: D/Database(21131): dbopen(): path = /mnt/sdcard/test_db/db.sqlite, mode: delete, disk free size: 3106 M, handle: 0x359260
01-05 17:09:44.260: I/Database(21131): sqlite returned: error code = 8, msg = statement aborts at 1: [pragma journal_mode = WAL;]
01-05 17:09:44.260: W/Database(21131): dbopen(): sqlite3_exec to set journal_mode to WAL for /mnt/sdcard/test_db/db.sqlite failed
01-05 17:09:44.260: E/Database(21131): dbopen(): errno = 2, error message = No such file or directory
錯誤的OpenDatabase方法發生。
有人可以幫我理解爲什麼會出現這個錯誤,我做錯了什麼。 謝謝。
編輯:我測試的是Android 2.3,HTC Desire HD的
變更後試'Environment.getExternalStorageDirectory()+ 「/ TEST_DB /」''到Environment.getExternalStorageDirectory()。getAbsolutePath()+ 「/ TEST_DB /」' –
並不能改變什麼。路徑是正確的,查詢工作正常,但是這個錯誤仍然出現... – mihail
與你的問題相同。可能是值得一拍.http://stackoverflow.com/questions/4718934/sqlite-issues-with-htc-desire-hd –