首次运行时无法加载sqlite数据库 [英] Unable to load sqlite database on first run
本文介绍了首次运行时无法加载sqlite数据库的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我在安装并首次启动时创建了一个应用程序，它会自动关闭，但在正常运行后打开它.如果我清除了该应用程序的数据，它也会第一次关闭.它显示android.database.sqlite.SQLiteCantOpenDatabaseException:未知错误(代码14):无法打开数据库 有人可以帮忙吗?
I have created an app when I install and launch it for first time it closes automatically but when I open it after it works fine. If I clear data of the app it also closes for first time. It shows android.database.sqlite.SQLiteCantOpenDatabaseException: unknown error (code 14): Could not open database Can anyone help here is my log
11-22 23:14:56.175 13193-13193/? I/art: Late-enabling -Xcheck:jni
11-22 23:14:56.195 13193-13193/? D/TidaProvider: TidaProvider()
11-22 23:14:56.285 13193-13193/com.elytelabs.myapplication W/art: Before Android 4.1, method android.graphics.PorterDuffColorFilter android.support.graphics.drawable.VectorDrawableCompat.updateTintFilter(android.graphics.PorterDuffColorFilter, android.content.res.ColorStateList, android.graphics.PorterDuff$Mode) would have incorrectly overridden the package-private method in android.graphics.drawable.Drawable
11-22 23:14:56.455 13193-13193/com.elytelabs.myapplication E/SQLiteLog: (14) cannot open file at line 30052 of [b3bb660af9]
11-22 23:14:56.455 13193-13193/com.elytelabs.myapplication E/SQLiteLog: (14) os_unix.c:30052: (2) open(/data/data/com.elytelabs.myapplication/databases/dictionary.db) -
11-22 23:14:56.455 13193-13193/com.elytelabs.myapplication E/SQLiteDatabase: Failed to open database '/data/data/com.elytelabs.myapplication/databases/dictionary.db'.
android.database.sqlite.SQLiteCantOpenDatabaseException: unknown error (code 14): Could not open database
at android.database.sqlite.SQLiteConnection.nativeOpen(Native Method)
at android.database.sqlite.SQLiteConnection.open(SQLiteConnection.java:209)
at android.database.sqlite.SQLiteConnection.open(SQLiteConnection.java:193)
at android.database.sqlite.SQLiteConnectionPool.openConnectionLocked(SQLiteConnectionPool.java:463)
at android.database.sqlite.SQLiteConnectionPool.open(SQLiteConnectionPool.java:185)
at android.database.sqlite.SQLiteConnectionPool.open(SQLiteConnectionPool.java:177)
at android.database.sqlite.SQLiteDatabase.openInner(SQLiteDatabase.java:806)
at android.database.sqlite.SQLiteDatabase.open(SQLiteDatabase.java:791)
at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:694)
at android.database.sqlite.SQLiteDatabase.openDatabase(SQLiteDatabase.java:669)
at com.elytelabs.myapplication.DatabaseHelper.checkDataBase(DatabaseHelper.java:85)
at com.elytelabs.myapplication.DatabaseHelper.createDataBase(DatabaseHelper.java:50)
at com.elytelabs.myapplication.MainActivity.fetchData(MainActivity.java:129)
at com.elytelabs.myapplication.MainActivity.onCreate(MainActivity.java:82)
at android.app.Activity.performCreate(Activity.java:6039)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2295)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2404)
at android.app.ActivityThread.access$900(ActivityThread.java:154)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1315)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5296)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:912)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:707)
11-22 23:14:56.525 13193-13193/com.elytelabs.myapplication E/SQLiteLog: (1) no such table: Dictionary1
11-22 23:14:56.525 13193-13193/com.elytelabs.myapplication D/AndroidRuntime: Shutting down VM
11-22 23:14:56.525 13193-13193/com.elytelabs.myapplication E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.elytelabs.myapplication, PID: 13193
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.elytelabs.myapplication/com.elytelabs.myapplication.MainActivity}: android.database.sqlite.SQLiteException: no such table: Dictionary1 (code 1): , while compiling: SELECT * FROM Dictionary1
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2342)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2404)
at android.app.ActivityThread.access$900(ActivityThread.java:154)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1315)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5296)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:912)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:707)
Caused by: android.database.sqlite.SQLiteException: no such table: Dictionary1 (code 1): , while compiling: SELECT * FROM Dictionary1
at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method)
at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:889)
at android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:500)
at android.database.sqlite.SQLiteSession.prepare(SQLiteSession.java:588)
at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:58)
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:1316)
at android.database.sqlite.SQLiteDatabase.queryWithFactory(SQLiteDatabase.java:1163)
at android.database.sqlite.SQLiteDatabase.query(SQLiteDatabase.java:1034)
at android.database.sqlite.SQLiteDatabase.query(SQLiteDatabase.java:1202)
at com.elytelabs.myapplication.MainActivity.fetchData(MainActivity.java:142)
at com.elytelabs.myapplication.MainActivity.onCreate(MainActivity.java:82)
at android.app.Activity.performCreate(Activity.java:6039)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1106)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2295)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2404)
at android.app.ActivityThread.access$900(ActivityThread.java:154)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1315)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5296)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:912)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:707)
11-22 23:14:56.535 13193-13193/com.elytelabs.myapplication I/Process: Sending signal. PID: 13193 SIG: 9
这是我的代码. 数据库helper.java
And here is my code. Database helper.java
public class DatabaseHelper extends SQLiteOpenHelper{
//The Android's default system path of your application database.
private static String DB_PATH = "";
private static String DB_NAME = "dictionary.db";
private SQLiteDatabase myDataBase;
private final Context myContext;
/**
* Constructor
* Takes and keeps a reference of the passed context in order to access to the application assets and resources.
* @param context
*/
public DatabaseHelper(Context context) {
super(context, DB_NAME, null, 1);
this.myContext = context;
DB_PATH= myContext.getDatabasePath(DB_NAME).toString();
}
/**
* Creates a empty database on the system and rewrites it with your own database.
* */
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.getWritableDatabase();
try {
copyDataBase();
} catch (IOException e) {
throw new Error("Error copying database");
}
}
}
/**
* Check if the database already exist to avoid re-copying the file each time you open the application.
* @return true if it exists, false if it doesn't
*/
private boolean checkDataBase(){
// this.getReadableDatabase();
SQLiteDatabase checkDB = null;
try{
String myPath = DB_PATH ;
checkDB = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READONLY);
}catch(SQLiteException e){
//database does't exist yet.
}
if(checkDB != null){
checkDB.close();
}
return checkDB != null ? true : false;
}
/**
* Copies your database from your local assets-folder to the just created empty database in the
* system folder, from where it can be accessed and handled.
* This is done by transfering bytestream.
* */
private void copyDataBase() throws IOException{
//Open your local db as the input stream
InputStream myInput = myContext.getAssets().open(DB_NAME);
// Path to the just created empty db
String outFileName = DB_PATH ;
//Open the empty db as the output stream
OutputStream myOutput = new FileOutputStream(outFileName);
//transfer bytes from the inputfile to the 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{
//Open the database
String myPath = DB_PATH ;
myDataBase = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READONLY);
}
@Override
public synchronized void close() {
if(myDataBase != null)
myDataBase.close();
super.close();
}
@Override
public void onCreate(SQLiteDatabase db) {
}
@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
}
// Add your public helper methods to access and get content from the database.
// You could return cursors by doing "return myDataBase.query(....)" so it'd be easy
// to you to create adapters for your views.
//add your public methods for insert, get, delete and update data in database.
}
这是我的主要活动.java
And here is my Main activity.java
public class MainActivity extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener {
private AdView mAdView;
private static RecyclerView.Adapter adapter;
private RecyclerView.LayoutManager layoutManager;
private static RecyclerView recyclerView;
public static ArrayList<DictObjectModel> data;
DatabaseHelper db ;
ArrayList<String> wordcombimelist;
ArrayList<String> meancombimelist;
LinkedHashMap<String,String> namelist;
SearchView searchView;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
drawer.setDrawerListener(toggle);
toggle.syncState();
NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
recyclerView = (RecyclerView) findViewById(R.id.my_recycler_view);
recyclerView.setHasFixedSize(true);
db= new DatabaseHelper(this);
layoutManager = new LinearLayoutManager(this);
recyclerView.setLayoutManager(layoutManager);
recyclerView.setItemAnimator(new DefaultItemAnimator());
data = new ArrayList<DictObjectModel>();
fetchData();
// Banner Ads
mAdView = (AdView) findViewById(R.id.adView);
AdRequest adRequest = new AdRequest.Builder().build();
mAdView.loadAd(adRequest);
}
public void fetchData()
{
db =new DatabaseHelper(this);
try {
db.createDataBase();
db.openDataBase();
}
catch (Exception e)
{
e.printStackTrace();
}
namelist=new LinkedHashMap<>();
int ii;
SQLiteDatabase sd = db.getReadableDatabase();
Cursor cursor = sd.query("Dictionary1" ,null, null, null, null, null, null);
ii=cursor.getColumnIndex("word");
wordcombimelist=new ArrayList<String>();
meancombimelist= new ArrayList<String>();
while (cursor.moveToNext()){
namelist.put(cursor.getString(ii), cursor.getString(cursor.getColumnIndex("definition")));
}
Iterator entries = namelist.entrySet().iterator();
while (entries.hasNext()) {
Map.Entry thisEntry = (Map.Entry) entries.next();
wordcombimelist.add(String.valueOf(thisEntry.getKey()));
meancombimelist.add("- "+String.valueOf(thisEntry.getValue()));
}
for (int i = 0; i < wordcombimelist.size(); i++) {
data.add(new DictObjectModel(wordcombimelist.get(i), meancombimelist.get(i)));
}
adapter = new CustomAdapter(data);
recyclerView.setAdapter(adapter);
}
@Override
public void onBackPressed() {
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
if (drawer.isDrawerOpen(GravityCompat.START)) {
drawer.closeDrawer(GravityCompat.START);
} else {
super.onBackPressed();
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main, menu);
final MenuItem item = menu.findItem(R.id.menu_search);
final SearchView searchView = (SearchView)
MenuItemCompat.getActionView(item);
searchView.setQueryRefinementEnabled(true);
searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
@Override
public boolean onQueryTextSubmit(String query) {return false; }
@Override
public boolean onQueryTextChange(String newText) {
newText = newText.toLowerCase();
final ArrayList<DictObjectModel> filteredList = new ArrayList<DictObjectModel>();
for (int i = 0; i < wordcombimelist.size(); i++) {
final String text = wordcombimelist.get(i).toLowerCase();
if (text.contains(newText)) {
filteredList.add(new DictObjectModel(wordcombimelist.get(i),meancombimelist.get(i)));
}
}
adapter = new CustomAdapter(filteredList);
recyclerView.setAdapter(adapter);
return true;
}
});
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
return false;
}
@SuppressWarnings("StatementWithEmptyBody")
@Override
public boolean onNavigationItemSelected(MenuItem item) {
// Handle navigation view item clicks here.
int id = item.getItemId();
if (id == R.id.nav_camera) {
// Handle the camera action
} else if (id == R.id.nav_gallery) {
} else if (id == R.id.nav_slideshow) {
} else if (id == R.id.nav_manage) {
} else if (id == R.id.nav_share) {
} else if (id == R.id.nav_send) {
}
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;
}
}
推荐答案
我认为数据库实际上已经成功复制并加载(打开)，而是问题在于复制的数据库没有尝试执行以下操作时，该表名为Dictionary1 :-
I believe that the database has in fact been copied and loaded (opened) successfully and rather that the issue is that the copied database does not have a table named Dictionary1 when attempting the following:-
Cursor cursor = sd.query("Dictionary1" ,null, null, null, null, null, null);
根据at com.elytelabs.myapplication.MainActivity.fetchData(MainActivity.java:142)
因此，您需要根据复制数据库中的表更正表名.
您可能希望使用此问题与解答以显示数据库信息.
You may wish to make use of this Q&A to display database information.
消息:-
11-22 23:14:56.455 13193-13193/com.elytelabs.myapplication E/SQLiteLog: (14) cannot open file at line 30052 of [b3bb660af9]
11-22 23:14:56.455 13193-13193/com.elytelabs.myapplication E/SQLiteLog: (14) os_unix.c:30052: (2) open(/data/data/com.elytelabs.myapplication/databases/dictionary.db) -
11-22 23:14:56.455 13193-13193/com.elytelabs.myapplication E/SQLiteDatabase: Failed to open database '/data/data/com.elytelabs.myapplication/databases/dictionary.db'.
android.database.sqlite.SQLiteCantOpenDatabaseException: unknown error (code 14): Could not open database
etc .........
调用checkDatabase方法时的
结果，因为当时尚未找到数据库，因为它尚未从资产中复制过来(应该这样做).
result from when the checkDatabase method is invoked as the database hasn't at that time been found as it hasn't been copied over from the assets (as it should do).
该方法使用getReadableDatabase方法来尝试查看数据库是否存在.此方法始终打印堆栈跟踪.
The method uses the getReadableDatabase method to try to see if the database exists. This method always prints the stacktrace.
一种替代方法是替换:-
An alternative approach could be to replace :-
private boolean checkDataBase(){
// this.getReadableDatabase();
SQLiteDatabase checkDB = null;
try{
String myPath = DB_PATH ;
checkDB = SQLiteDatabase.openDatabase(myPath, null, SQLiteDatabase.OPEN_READONLY);
}catch(SQLiteException e){
//database does't exist yet.
}
if(checkDB != null){
checkDB.close();
}
return checkDB != null ? true : false;
}
与:-
private boolean checkDataBase(){
File db = new File(DB_PATH);
if(db.exists()) return true;
File dir = new File(db.getParent());
if (!dir.exists()) {
dir.mkdirs();
}
return false;
}
这会尝试查看数据库文件是否存在(并且还会在路径中创建不存在的目录，例如在某些情况下数据库目录可能不存在.)
This attempts to see if the database file exists (and also creates an non-existing directories in the path e.g. in some circumstances the databases directory may not exist.)
如果使用上述选项，则您的消息更像是:-
If the above is used then your messages be more like :-
11-22 23:14:56.525 13193-13193/com.elytelabs.myapplication E/SQLiteLog: (1) no such table: Dictionary1
11-22 23:14:56.525 13193-13193/com.elytelabs.myapplication D/AndroidRuntime: Shutting down VM
11-22 23:14:56.525 13193-13193/com.elytelabs.myapplication E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.elytelabs.myapplication, PID: 13193
java.lang.RuntimeException: Unable to start activity ComponentInfo{com.elytelabs.myapplication/com.elytelabs.myapplication.MainActivity}: android.database.sqlite.SQLiteException: no such table: Dictionary1 (code 1): , while compiling: SELECT * FROM Dictionary1
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2342)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2404)
at android.app.ActivityThread.access$900(ActivityThread.java:154)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1315)
at android.os.Handler.dispatchMessage(Handler.java:102)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5296)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:912)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:707)
Caused by: android.database.sqlite.SQLiteException: no such table: Dictionary1 (code 1): , while compiling: SELECT * FROM Dictionary1
at android.database.sqlite.SQLiteConnection.nativePrepareStatement(Native Method)
at android.database.sqlite.SQLiteConnection.acquirePreparedStatement(SQLiteConnection.java:889)
at android.database.sqlite.SQLiteConnection.prepare(SQLiteConnection.java:500)
at android.database.sqlite.SQLiteSession.prepare(SQLiteSession.java:588)
at android.database.sqlite.SQLiteProgram.<init>(SQLiteProgram.java:58)
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:1316)
at android.database.sqlite.SQLiteDatabase.queryWithFactory(SQLiteDatabase.java:1163)
at android.database.sqlite.SQLiteDatabase.query(SQLiteDatabase.java:1034)
at android.database.sqlite.SQLiteDatabase.query(SQLiteDatabase.java:1202)
at com.elytelabs.myapplication.MainActivity.fetchData(MainActivity.java:142)
at com.elytelabs.myapplication.MainActivity.onCreate(MainActivity.java:82)
这篇关于首次运行时无法加载sqlite数据库的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
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