我正在尝试让我的应用程序访问我的资产文件中的预先存在的数据库，但它似乎给我一个错误并拒绝启动，说worddata表不存在。
04-11 01:21:17.462 28154-28154/com.example.nourhamran.anothertest E/AndroidRuntime: FATAL EXCEPTION: main Process: com.example.nourhamran.anothertest,
PID: 28154 java.lang.RuntimeException: Unable to start activity ComponentInfo {
com.example.nourhamran.anothertest/com.example.nourhamran.anothertest.MainActivity
}
: android.database.sqlite.SQLiteException: no such table: wordsdata (code 1):,
while compiling: Select * FROM wordsdata ################################################################# Error Code: 1 (SQLITE_ERROR) Caused By: SQL(query) error or missing database. (no such table: wordsdata (code 1):, while compiling: Select * FROM wordsdata) ################################################################# at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2927) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2988) at android.app.ActivityThread.-wrap14(ActivityThread.java) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1631) at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:154) at android.app.ActivityThread.main(ActivityThread.java:6682) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1520) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1410) Caused by: android.database.sqlite.SQLiteException: no such table: wordsdata (code 1):,
while compiling: Select * FROM wordsdata ################################################################# Error Code: 1 (SQLITE_ERROR) Caused By: SQL(query) error or missing database. (no such table: wordsdata (code 1):, while compiling: Select * FROM wordsdata) ################################################################# at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method) at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:1005) at android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:570) at android.database.sqlite.SQLiteSession.prepare(SQLiteSession.java:588) at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:59) at android.database.sqlite.SQLiteQuery.<init>(SQLiteQuery.java:37) at android.database.sqlite.SQLiteDirectCursorDriver.query(SQLiteDirectCursorDriver.java:44) at android.database.sqlite.SQLiteDatabase.rawQueryWithFactory(SQLiteDatabase.java:1697) at android.database.sqlite.SQLiteDatabase.rawQuery(SQLiteDatabase.java:1636) at com.example.nourhamran.anothertest.DataBaseHelper.Displaywords(MainActivity.java:470) at com.example.nourhamran.anothertest.MainActivity.onCreate(MainActivity.java:97) at android.app.Activity.performCreate(Activity.java:6942) at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1126) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2880) ... 9 more
这是我的DataBaseHelper代码
class DataBaseHelper extends SQLiteOpenHelper {
private static String thewords;
final String LOG_TAG = "myLogs";
private static String DATABASE_PATH = null;
private static final int DATABASE_VERSION = 1;
private static final String DATABASE_NAME = "voiceappdb";
private static final String TABLE_NAME = "wordsdata";
private static final String KEY_ID = "_id";
public static final String Enwd = "Enwd";
public static final String Enno = "Enno";
public static final String Enyes = "Enyes";
private SQLiteDatabase mDataBase;
private final Context mContext;
private ArrayList<String> mylist = new ArrayList<>();
public DataBaseHelper(Context context)
{
super(context, DATABASE_NAME, null, 1);// 1? Its database Version
if(android.os.Build.VERSION.SDK_INT >= 17){
DATABASE_PATH = context.getApplicationInfo().dataDir + "/databases/";
}
else
{
DATABASE_PATH = context.getFilesDir() + context.getPackageName() + "/databases/";
}
this.mContext = context;
}
public void createDataBase() throws IOException
{
//If the database does not exist, copy it from the assets.
boolean mDataBaseExist = checkDataBase();
if(!mDataBaseExist)
{
this.getReadableDatabase();
// this.close();
try
{
//Copy the database from assests
copyDataBase();
Log.e(LOG_TAG, "createDatabase database created");
}
catch (IOException mIOException)
{
throw new RuntimeException("ErrorCopyingDatabase");
}
}
}
//Check that the database exists here: /data/data/your package/databases/Da Name
private boolean checkDataBase()
{
File dbFile = new File(DATABASE_PATH + DATABASE_NAME);
Log.v("dbFile", dbFile + " "+ dbFile.exists());
return dbFile.exists();
}
//Copy the database from assets
private void copyDataBase() throws IOException
{
InputStream mInput = mContext.getAssets().open(DATABASE_NAME);
String outFileName = DATABASE_PATH + DATABASE_NAME;
OutputStream mOutput = new FileOutputStream(outFileName);
byte[] mBuffer = new byte[1024];
int mLength;
while ((mLength = mInput.read(mBuffer))>0)
{
mOutput.write(mBuffer, 0, mLength);
}
mOutput.flush();
mOutput.close();
mInput.close();
}
//Open the database, so we can query it
public boolean openDataBase() throws SQLException
{
String mPath = DATABASE_PATH + DATABASE_NAME;
Log.v("mPath", mPath);
mDataBase = SQLiteDatabase.openDatabase(mPath, null, SQLiteDatabase.CREATE_IF_NECESSARY);
//mDataBase = SQLiteDatabase.openDatabase(mPath, null, SQLiteDatabase.NO_LOCALIZED_COLLATORS);
return mDataBase != null;
}
public word fetchwords(int id) throws SQLException {
SQLiteDatabase db = this.getReadableDatabase();
Cursor mCursor = db.query(TABLE_NAME, new String[] { KEY_ID, Enwd, Enyes,Enno},KEY_ID + "=?",new String[] {String.valueOf(id)},null,null,null,null);
if (mCursor != null)
mCursor.moveToFirst();
word wrd = new word(Integer.parseInt(mCursor.getString(0)),mCursor.getString(1),Integer.parseInt(mCursor.getString(2)),Integer.parseInt(mCursor.getString(3)));
return wrd;
}
public List<word> Displaywords() {
List<word> wordlist = new ArrayList<word>();
String query = "Select * FROM " + TABLE_NAME;
SQLiteDatabase db = this.getWritableDatabase();
Cursor cursor = db.rawQuery(query,null);
if (cursor.moveToFirst())
do {
word wrd = new word();
wrd.setid(Integer.parseInt(cursor.getString(0)));
wrd.setword(cursor.getString(1));
wrd.setno(Integer.parseInt(cursor.getString(2)));
wrd.setyes(Integer.parseInt(cursor.getString(3)));
wordlist.add(wrd);
} while (cursor.moveToNext());
return wordlist;
}
@Override
public void onCreate(SQLiteDatabase db) {
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
}
}
这是我主要活动的片段，我尝试打开并使用数据库
public void onCreate(Bundle savedInstanceState) {
//call superclass
super.onCreate(savedInstanceState);
//set contect view
setContentView(R.layout.activity_main);
//reference to speak button
Button speechBtn = (Button) findViewById(R.id.speech_btn);
wordList = (ListView) findViewById(R.id.word_list);
Button sugbtn = (Button) findViewById(R.id.sug_btn);
DataBaseHelper myDbHelper = new DataBaseHelper(this.getApplicationContext());
try {
myDbHelper.createDataBase();
} catch (IOException e) {
e.printStackTrace();
}
myDbHelper.openDataBase();
List<word> words = myDbHelper.Displaywords();
for(word wordz : words){
String log = "id: " + wordz.getid() + "Enwd: "+ wordz.getword();
Log.d(" words database: ", log);
}
//database is open!
所以这是我的DataBaseHelper再次使用SQliteAssetHelper扩展
class DataBaseHelper extends SQLiteAssetHelper {
private static String thewords;
final String LOG_TAG = "myLogs";
private static String DATABASE_PATH = null;
private static final int DATABASE_VERSION = 1;
private static final String DATABASE_NAME = "voiceappdb.db";
private static final String TABLE_NAME = "wordsdata";
private static final String KEY_ID = "_id";
public static final String Enwd = "Enwd";
public static final String Enno = "Enno";
public static final String Enyes = "Enyes";
private SQLiteDatabase mDataBase;
private final Context mContext;
private ArrayList<String> mylist = new ArrayList<>();
public DataBaseHelper(Context context)
{
super(context, DATABASE_NAME, context.getExternalFilesDir(null).getAbsolutePath(),null, 1);// 1? Its database Version
if(android.os.Build.VERSION.SDK_INT >= 17){
DATABASE_PATH = context.getApplicationInfo().dataDir + "/databases/";
}
else
{
DATABASE_PATH = context.getFilesDir() + context.getPackageName() + "/databases/";
}
this.mContext = context;
}
public void createDataBase() throws IOException
{
//If the database does not exist, copy it from the assets.
boolean mDataBaseExist = checkDataBase();
if(!mDataBaseExist)
{
this.getReadableDatabase();
// this.close();
try
{
//Copy the database from assests
copyDataBase();
Log.e(LOG_TAG, "createDatabase database created");
}
catch (IOException mIOException)
{
throw new RuntimeException("ErrorCopyingDatabase");
}
}
}
//Check that the database exists here: /data/data/your package/databases/Da Name
private boolean checkDataBase()
{
File dbFile = new File(DATABASE_PATH + DATABASE_NAME);
Log.v("dbFile", dbFile + " "+ dbFile.exists());
return dbFile.exists();
}
//Copy the database from assets
private void copyDataBase() throws IOException
{
InputStream mInput = mContext.getAssets().open(DATABASE_NAME);
String outFileName = DATABASE_PATH + DATABASE_NAME;
OutputStream mOutput = new FileOutputStream(outFileName);
byte[] mBuffer = new byte[1024];
int mLength;
while ((mLength = mInput.read(mBuffer))>0)
{
mOutput.write(mBuffer, 0, mLength);
}
mOutput.flush();
mOutput.close();
mInput.close();
}
//Open the database, so we can query it
public boolean openDataBase() throws SQLException
{
String mPath = DATABASE_PATH + DATABASE_NAME;
Log.v("mPath", mPath);
mDataBase = SQLiteDatabase.openDatabase(mPath, null, SQLiteDatabase.CREATE_IF_NECESSARY);
//mDataBase = SQLiteDatabase.openDatabase(mPath, null, SQLiteDatabase.NO_LOCALIZED_COLLATORS);
return mDataBase != null;
}
public word fetchwords(int id) throws SQLException {
SQLiteDatabase db = this.getReadableDatabase();
Cursor mCursor = db.query(TABLE_NAME, new String[] { KEY_ID, Enwd, Enyes,Enno},KEY_ID + "=?",new String[] {String.valueOf(id)},null,null,null,null);
if (mCursor != null)
mCursor.moveToFirst();
word wrd = new word(Integer.parseInt(mCursor.getString(0)),mCursor.getString(1),Integer.parseInt(mCursor.getString(2)),Integer.parseInt(mCursor.getString(3)));
return wrd;
}
public List<word> Displaywords() {
List<word> wordlist = new ArrayList<word>();
String query = "Select * FROM " + TABLE_NAME;
SQLiteDatabase db = this.getReadableDatabase();
Cursor cursor = db.rawQuery(query,null);
if (cursor.moveToFirst())
do {
word wrd = new word();
wrd.setid(Integer.parseInt(cursor.getString(0)));
wrd.setword(cursor.getString(1));
wrd.setno(Integer.parseInt(cursor.getString(2)));
wrd.setyes(Integer.parseInt(cursor.getString(3)));
wordlist.add(wrd);
} while (cursor.moveToNext());
return wordlist;
}
也有问题，这是数据库文件https://1drv.ms/u/s!AlLFl3esRRfSgW8qoNS5qcs7t_i8
答案 0 :(得分：2)