任何人都可以解釋什麼是問題? 我開發了我的應用程序,它使用我自己的數據庫。所有工作正常,但有一天,我開始收到錯誤在無法在Android設備上打開我的數據庫,但可以在模擬器上
long rowsCount = DatabaseUtils.queryNumEntries(myDataBase, table);
的錯誤是
android.database.sqlite.SQLiteDatabaseCorruptException:數據庫磁盤映像格式有誤:,編譯時:SELECT (*)FROM words
最奇怪的是我只在我的設備(lg p500)上收到錯誤,並且程序在仿真器上正常工作。
dbHelper = new MySQLiteHelper(context);
try {
dbHelper.createDataBase();
}catch(IOException ioe)
{
throw new Error("Unable to create database");
}
...
dbHelper.openDataBase();
long tableSize = dbHelper.countTableRows(MySQLiteHelper.TABLE_WORDS); //The error appears
...
MySQLiteHelper代碼:
public class MySQLiteHelper extends SQLiteOpenHelper {
private static final String DATABASE_NAME = "words.db";
private static final int DATABASE_VERSION = 1;
private static final String DB_PATH = "/data/data/ru.my.program/databases";
public static final String TABLE_WORDS = "words";
public static final String COLUMN_ID = "_id";
public static final String COLUMN_WORD = "word";
private final Context myContext;
public SQLiteDatabase myDataBase;
public MySQLiteHelper(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
myContext = context;
}
@Override
public void onCreate(SQLiteDatabase database) {
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
}
public void createDataBase() throws IOException{
boolean dbExist = checkDataBase();
if(dbExist){
//do nothing - database already exist
}else{
//By calling this method and empty database will be created into the default system path
//of your application so we are gonna be able to overwrite that database with our database.
this.getReadableDatabase();
this.close();
try
{
copyDataBase();
}
catch(IOException e)
{
throw new Error("Error copying database");
}
}
}
private boolean checkDataBase(){
File dbFile = new File(DB_PATH + "/" + DATABASE_NAME);
return dbFile.exists();
}
private void copyDataBase() throws IOException{
//Open your local db as the input stream
InputStream myinput = myContext.getAssets().open(DATABASE_NAME);
// Path to the just created empty db
String outfilename = DB_PATH + "/" +DATABASE_NAME;
//Open the empty db as the output stream
OutputStream myoutput = new FileOutputStream("/data/data/ru.my.program/databases/words.db");
// transfer byte to inputfile to outputfile
byte[] buffer = new byte[1024];
int length;
while ((length = myinput.read(buffer))>0)
{
myoutput.write(buffer,0,length);
}
//Close the streams
myoutput.flush();
myoutput.close();
myinput.close();
}
public void openDataBase() throws SQLException{
String myPath = DB_PATH + "/" +DATABASE_NAME;
myDataBase = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.NO_LOCALIZED_COLLATORS|SQLiteDatabase.OPEN_READONLY);
Log.i(MySQLiteHelper.class.getName(), "Open DB");
}
@Override
public synchronized void close() {
if(myDataBase != null)
myDataBase.close();
super.close();
}
public long countTableRows(String table)
{
long rowsCount = DatabaseUtils.queryNumEntries(myDataBase, table);
return rowsCount;
}
我已經檢查了數據庫與DDMS的設備上,並相信它是在一個合適的複製
我與數據庫相關的代碼和資產一樣。
我已檢查數據庫是否具有locale =「ru_RU」的android_metadata表。
我檢查了我在「單詞」表中有「_id」列。
我試圖手動刪除應用程序文件夾(與數據庫),但它沒有幫助。
我甚至嘗試重新命名我的應用程序包...
試圖在其他設備(HTC Wildfire)上啓動程序,結果相同。 P.S.可以,我的SQLite數據庫words.db是291 KB,我編譯的APK只有143 KB? – forcelain 2012-02-17 08:47:32