谁能解释一下有什么问题？我开发了使用我自己的数据库的应用程序。一切正常，但有一天我开始收到错误
long rowsCount = DatabaseUtils.queryNumEntries(myDataBase, table);
错误是
android.database.sqlite.SQLiteDatabaseCorruptException：数据库磁盘映像格式错误：，编译时：SELECT count(*) FROM words
最奇怪的是我只在我的设备（lg p500）上收到错误，并且程序在模拟器上运行良好。
我的与数据库相关的代码：
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 代码：
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;
}
我已经使用 DDMS 检查了设备上的数据库，并确信它被复制到了适当的位置，并且与资产中的相同。
我检查了数据库是否有带有 locale="ru_RU" 的 android_metadata 表。
我检查了“单词”表中是否有“_id”列。
我尝试手动删除应用程序文件夹（带有数据库），但没有帮助。
我什至试图重命名我的应用程序包......