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我在 2 个月前发布了我的应用程序，有时我会收到一些关于错误的报告。

这是错误报告：

java.lang.RuntimeException: Unable to start activity    ComponentInfo{mdpi.android/mdpi.android.User_Registration_Country_Choosing}: java.lang.IllegalStateException: database not open
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1651)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1667)
at android.app.ActivityThread.access$1500(ActivityThread.java:117)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java:935)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:130)
at android.app.ActivityThread.main(ActivityThread.java:3687)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:507)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:867)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:625)
at dalvik.system.NativeStart.main(Native Method)
Caused by: java.lang.IllegalStateException: database not open
at android.database.sqlite.SQLiteDatabase.queryWithFactory(SQLiteDatabase.java:1232)
at android.database.sqlite.SQLiteDatabase.query(SQLiteDatabase.java:1191)
at android.database.sqlite.SQLiteDatabase.query(SQLiteDatabase.java:1273)
at mdpi.android.database.LocalDatabase.getAllCountrys(LocalDatabase.java:310)
at    mdpi.android.User_Registration_Country_Choosing.onCreate(User_Registration_Country_Choosing.java:81)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1615)
... 11 more

奇怪的是，当我测试应用程序时，我更新了这个错误......

你有一个想法可能是什么问题？？？

谢谢你。

这是 User_Registration_country_Choosing 的代码

public class User_Registration_Country_Choosing extends Activity implements TextWatcher {


public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState); 

    setContentView(R.layout.choosecountry);

//      Disable the Strict mode
    StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
    StrictMode.setThreadPolicy(policy);

    Country = (EditText) findViewById(R.id.CountryName);
    Country.requestFocus();

    Bundle b                        = this.getIntent().getExtras();    
    user =  new User_Database(0, null, null, null, null, null, null, null, null, null);
    registrationConfirmPassword     = b.getString("registrationConfirmPassword");
    user                            = b.getParcelable("user");


    InputMethodManager inputManager = (InputMethodManager)
            getSystemService(Context.INPUT_METHOD_SERVICE); 
    try{
    inputManager.showSoftInput(Country, InputMethodManager.SHOW_IMPLICIT);
    }
    catch (Exception e)
    {}

    Country.addTextChangedListener(this);
    String ChooseCountry = "'%%'";
    List<Country> values = LocalDatabase.getAllCountrys(ChooseCountry);

    ListView lv = (ListView)findViewById(R.id.listView1);
    lv.setAdapter(new ArrayAdapter<Country>(
            this,R.layout.country_list_black_text,R.id.list_content, values));

    lv.setOnItemClickListener(new OnItemClickListener() {
        public void onItemClick(AdapterView<?> parent, final View view,
            int position, long id) {
            TextView textView = (TextView) view.findViewById(R.id.list_content);
            final String choosencountry = textView.getText().toString(); 
            Toast.makeText(mContext, "You choosed: "+choosencountry, Toast.LENGTH_LONG).show();
            user.setcountry(choosencountry);
            KeyboardDown();
            new Handler().postDelayed(new Runnable() {
                public void run() {

                    Intent myIntent = new Intent(view.getContext(), UserRegistration.class);
                    Bundle b                = new Bundle();
                    b.putParcelable("user", user);
                    b.putString("registrationConfirmPassword", registrationConfirmPassword);
                    myIntent.putExtras(b);
                    startActivityForResult(myIntent, 0);  
                    KeyboardDown(); 
                    finish(); 
                    }
                }, 3500);
            }
        });
  }

public void afterTextChanged(Editable arg0) {}

public void beforeTextChanged(CharSequence arg0, int arg1, int arg2,
        int arg3) { }

public void onTextChanged(CharSequence s, int start, int before, int count) {
    EditText Country;
    Country = (EditText) findViewById(R.id.CountryName);
    String country = Country.getText().toString();
    String ChooseCountry = "'"+country+"%'";
    List<Country> values = LocalDatabase.getAllCountrys(ChooseCountry);

    ListView lv = (ListView)findViewById(R.id.listView1);
    lv.setAdapter(new ArrayAdapter<Country>(
            this,R.layout.country_list_black_text,R.id.list_content, values));
}

public void KeyboardDown(){
    InputMethodManager inputManager = (InputMethodManager)
            getSystemService(Context.INPUT_METHOD_SERVICE); 
    try{
    inputManager.hideSoftInputFromWindow(getCurrentFocus().getWindowToken(),
               InputMethodManager.HIDE_NOT_ALWAYS);
    }
    catch (Exception e)
    {}
}
}

这是 LocalDatabase.java 的代码

package mdpi.android.database;



public class LocalDatabase {

public LocalDatabase(Context context){
    databasetables = new DatabaseTables(context, NAME_Database, null, VERSION_BDD);
}

public void open(){
    Database = databasetables.getWritableDatabase();
}

public void close(){
    Database.close();
}

public SQLiteDatabase getBDD(){
    return Database;
}


public static long insertUser(User_Database user){
    ContentValues values = new ContentValues();
    values.put("ID", user.getuserId());
    values.put("email", user.getemail());
    values.put("password", user.getpassword());
    values.put("first_name", user.getfirstname());
    values.put("last_name", user.getlastname());
    values.put("street", user.getstreet());
    values.put("postal_code", user.getpostalcode());
    values.put("city", user.getcity());
    values.put("country", user.getcountry());
    values.put("alert_frequency", user.getalertfrequency());
    return Database.insert("user", null, values);
}

public static long insertSubmission(Submissions_Database submission){
    ContentValues values = new ContentValues();
    values.put("ID", submission.getID());
    values.put("hash", submission.getHashKey());
    values.put("journalId", submission.getJournalID());
    values.put("title", submission.getTitle());
    values.put("subtitle", submission.getSubTitle());
    values.put("date", submission.getDate());
    values.put("status", submission.getStatus());
    values.put("journal_title", submission.getJournalTitle());
    return Database.insert("submission", null, values);
}

public static long insertSubmissionLog(SubmissionLog_Database submissionLog){
    ContentValues values = new ContentValues();
    values.put("title", submissionLog.getTitle());
    values.put("hash", submissionLog.getHashKey());
    values.put("date", submissionLog.getDate());
    return Database.insert("submissionlog", null, values);
}

public static long insertSubscriptionsFromTheServer(Subscription_Database subscriptions){
    ContentValues values = new ContentValues();
    values.put("journalId", subscriptions.getJournalID());
    return Database.insert("subscriptions", null, values);
}

public static long insertSubscriptionsFromtTheJournalList(int journalId){
    ContentValues values = new ContentValues();
    values.put("journalId", journalId);
    return Database.insert("subscriptions", null, values);
}

public static long insertCountry(Country country){
    ContentValues values = new ContentValues();
    values.put("id", country.getid());
    values.put("name", country.toString());
    return Database.insert("country", null, values);    
}

public static long insertJournal(Journal_Database journals){
    ContentValues values = new ContentValues();
    values.put("journalId", journals.getJournalID());
    values.put("nameFull", journals.getNameFull());
    values.put("nameShort", journals.getNameShort());
    values.put("nameSystem", journals.getNameSystem());
    values.put("about", journals.getAbout());
    values.put("nameIso4", journals.getNameIso4());
    values.put("namePubmed", journals.getNamePubmed());
    values.put("namePubmedShort", journals.getNamePubmedShort());
    values.put("ISSNElectronic", journals.getISSNElectronic());
    values.put("coden", journals.getCoden());
    values.put("APCChf", journals.getAPCChf());
    values.put("APCCny", journals.getAPCCny());
    values.put("APCEngChf", journals.getAPCEngChf());
    values.put("APCEngCny", journals.getAPCEngCny());
    values.put("APCFormatChf", journals.getAPCFormatChf());
    values.put("SCITracked", journals.getSCITracked());
    values.put("impactFactor", journals.getImpactFactor());
    values.put("ImpactFactor5years", journals.getImpactFactor5years());
    values.put("ImpactFactorYear", journals.getImpactFactorYear());
    values.put("EstablishedYear", journals.getEstablishedYear());
    values.put("ShortDescription", journals.getShortDescription());
    values.put("AcceptedPapers", journals.getAcceptedPapers());
    values.put("StyleHeaderLight", journals.getStyleHeaderLight());
    values.put("StyleHeaderDark", journals.getStyleHeaderLight());
    values.put("CurrentIssue", journals.getCurrentIssue());
    values.put("FurthcomingIssue", journals.getForthcomingIssue());
    values.put("ContactEmail", journals.getContactEmail());
    values.put("ContactID", journals.getContactID());
    values.put("Pubfrequency", journals.getPubfrequency());
    values.put("PublicFlag", journals.getPublicFlag());
    values.put("ReviewRequestTime", journals.getReviewRequestTime());
    values.put("DOIAbbreviation", journals.getDOIAbbreviation());
    return Database.insert("journals", null, values);
}

public static void delateSubscribedJournal(int journalId){
    Database.execSQL("DELETE FROM subscriptions WHERE journalId ="+journalId);
}

public static void deleteSubmissionLog(){
    Database.execSQL("DELETE FROM submissionlog");
}

public static void deleteSubscriptions(){
    Database.execSQL("DELETE FROM subscriptions");
}

public static void deleteUser(){
    Database.execSQL("DELETE FROM user");
}

public static void deleteUserSubmissions(){
    Database.execSQL("DELETE FROM submission");
}

public static void deleteHistory(){ 
    Database.execSQL("DELETE FROM history");
}

public static void deleteJournals()
{
    Database.execSQL("DELETE FROM journals");
}

public static void deleteEditorialBoard()
{
    Database.execSQL("DELETE FROM editorialboard");
}

public static void deleteHighlights_News()
{
    Database.execSQL("DELETE FROM highlights_news");
}
public static void deleteHighlights_NewSpecialIssues()
{
    Database.execSQL("DELETE FROM highlights_new_special_issues");
}




public static List<Country> getAllCountrys(String ChooseCountry) {
    List<Country> countrys = new ArrayList<Country>();

    Cursor cursor = Database.query("country",
            CountryColName,"name like " + ChooseCountry, null, null, null, null);

    cursor.moveToFirst();
    while (!cursor.isAfterLast()) {
        Country country = cursorToCountry(cursor);
        countrys.add(country);
        cursor.moveToNext();
    }
    cursor.close();
    return countrys;
}

public static  String getChoosenCountryName(String countryIdString) {

    if (countryIdString!=null)
    {
    int countryIdInt=Integer.decode(countryIdString);

    Cursor cursor = Database.query("country",
            CountryColName,"id like " + countryIdInt, null, null, null, null);

    cursor.moveToFirst();
    String countryName = null;
    while (!cursor.isAfterLast()) {
        countryName = cursor.getString(0);      
        cursor.moveToNext();
    }
    cursor.close();
    return countryName;
    }
    return "";
}

public static  int getChoosenCountryId(String countryName) {
    Cursor cursor = Database.query("country",
            CountryColId,"name like "+"'"+countryName+"'", null, null, null, null);

    cursor.moveToFirst();
    int countryId = 0;
    while (!cursor.isAfterLast()) {
        countryId = cursor.getInt(0);
        cursor.moveToNext();
    }
    cursor.close();
    return countryId;
}

private static Country cursorToCountry(Cursor cursor) {
    Country country = new Country(0,null);
    country.setname(cursor.getString(0));
    return country;
}


public static long updateJournal(int journalId, String updateRow,String value){
    ContentValues values = new ContentValues();
    values.put(updateRow,value);
    return Database.update("journals", values, "journalId="+ journalId, null);
}


public static int CheckCountryPresence() {
    final SQLiteStatement stmt = 
    Database.compileStatement("SELECT COUNT(*) FROM COUNTRY");
    return (int) stmt.simpleQueryForLong();
}

public static int CheckOfficesPresence() {
    final SQLiteStatement stmt = 
    Database.compileStatement("SELECT COUNT(*) FROM OFFICES");
    return (int) stmt.simpleQueryForLong();
}

private static User_Database cursorToUser(Cursor cursor) {
    User_Database user = new User_Database(0, null, null, null, null, null, null, null, null, null);
    user.setuserId(cursor.getInt(0));
    user.setemail(cursor.getString(1));
    user.setpassword(cursor.getString(2));
    user.setfirstname(cursor.getString(3));
    user.setlastname(cursor.getString(4));
    user.setstreet(cursor.getString(5));
    user.setpostalcode(cursor.getString(6));
    user.setcity(cursor.getString(7));
    user.setcountry(cursor.getString(8));
    user.setalertfrequency(cursor.getString(9));
    return user;
}

public static User_Database getUserInformations() {
    User_Database user = new User_Database(0, null, null, null, null, null, null, null, null, null);
    Cursor cursor = Database.query("user",
            UserCol_All,"", null, null, null, null);

    cursor.moveToFirst();
    while (!cursor.isAfterLast()) {
        user = cursorToUser(cursor);
        cursor.moveToNext();
    }
    cursor.close();
    return user;
}





public static ArrayList<Submissions_Database> getAllSubmissions() {
    ArrayList<Submissions_Database> submissions = new ArrayList<Submissions_Database>();

    Cursor cursor = Database.query("submission",
            SubmissionCOL_All,"", null, null, null, "date DESC");
    cursor.moveToFirst();
    while (!cursor.isAfterLast()) {
        Submissions_Database submission = cursorToSubmissions(cursor);
        submissions.add(submission);
        cursor.moveToNext();
    }
    cursor.close();
    return submissions;
}

public static Submissions_Database getSelectedSubmission(String hashKey) {

    Cursor cursor = Database.query("submission",
            SubmissionCOL_All,"hash like "+"'"+hashKey+"'", null, null, null, null);
    Submissions_Database submission = new Submissions_Database(0, null, 0, null, null, null, 0, null);
    cursor.moveToFirst();
    while (!cursor.isAfterLast()) {
        submission = cursorToSubmissions(cursor);
        cursor.moveToNext();
    }
    cursor.close();
    return submission;
}

public static ArrayList<Submissions_Database> getAllSearchedSubmissions(String submissionName) {
    ArrayList<Submissions_Database> submissions = new ArrayList<Submissions_Database>();

    Cursor cursor = Database.query("submission",
            SubmissionCOL_All,
            "title like '%"+submissionName+"%'"
            +" OR subtitle like '%"+submissionName+"%'"
            +" OR id like '%"+submissionName+"%'",
            null, null, null, "date DESC", "10");
    cursor.moveToFirst();
    while (!cursor.isAfterLast()) {
        Submissions_Database submission = cursorToSubmissions(cursor);
        submissions.add(submission);
        cursor.moveToNext();
    }
    cursor.close();
    return submissions;
}

private static Submissions_Database cursorToSubmissions(Cursor cursor) {
    Submissions_Database submission = new Submissions_Database(0, null, 0, null, null, null, 0, null);
    submission.setJournalTitle(cursor.getString(0));

    String SubmissionJournalDate = "Unknown";
    SubmissionJournalDate = cursor.getString(1);

    if (SubmissionJournalDate ==null)
    {
        submission.setDate("Unknown");
    }
    else
    {
        SimpleDateFormat fmt = new SimpleDateFormat("yyyy-MM-dd");
        try 
        {
            Date date = fmt.parse(SubmissionJournalDate);
            SimpleDateFormat fmtOut = new SimpleDateFormat("dd-MM-yyyy");
            submission.setDate(fmtOut.format(date));
        }
        catch(ParseException pe) 
        {
            submission.setDate("Unknown");   
        }
    }
    submission.setTitle(cursor.getString(2));
    submission.setID(cursor.getInt(3));
    submission.setHashKey(cursor.getString(4));
    submission.setStatus(cursor.getInt(5));
    return submission;
}

public static int getSubmissionsSize() {
    try{
    final SQLiteStatement stmt = Database
            .compileStatement("SELECT MAX(rowid) FROM submission");
    return (int) stmt.simpleQueryForLong();
    }
    catch (Exception e) {
        return 0;
    }
}


public static ArrayList<Journal_Database> getAllPublicJournalNames() {
    ArrayList<Journal_Database> journals = new ArrayList<Journal_Database>();
    Cursor cursor = Database.query("journals",
            JournalsCOL_All,"publicFlag like 1", null, null, null, "nameSystem");
    cursor.moveToFirst();
    while (!cursor.isAfterLast()) {
        Journal_Database journalObject = cursorToJournals(cursor);
        journals.add(journalObject);
        cursor.moveToNext();
    }
    cursor.close();
    return journals;
}

public static ArrayList<Journal_Database> getAllSearchedJournals(String journalName, String limit ) {
    ArrayList<Journal_Database> journals = new ArrayList<Journal_Database>();
    Cursor cursor = Database.query("journals",
            JournalsCOL_All,
            "nameSystem like '%"+journalName+"%' AND PublicFlag = 1"
            +" OR nameFull like '%"+journalName+"%' AND PublicFlag = 1"
            +" OR nameShort like '%"+journalName+"%' AND PublicFlag = 1"
            , null, null, null, "nameSystem", limit );
    cursor.moveToFirst();
    while (!cursor.isAfterLast()) {
        Journal_Database journalObject = cursorToJournals(cursor);
        journals.add(journalObject);
        cursor.moveToNext();
    }
    cursor.close();
    return journals;
}



private static Subscription_Database cursorToSubscriptions(Cursor cursor) {
    Subscription_Database subscription = new Subscription_Database(0);
    subscription.setJournalID(cursor.getInt(0));
    return subscription;
}

public static boolean JournalPresence() {
    final SQLiteStatement stmt = 
    Database.compileStatement("SELECT COUNT(*) FROM JOURNALS");
    if (stmt.simpleQueryForLong()==0){
    return false;
    }
    else{
        return true;
    }
}

public static String getJournalNameShort(int journalId){
    Cursor cursor2 = Database.query("journals",
            JournalCOL_NameShort,"journalId like "+"'"+journalId+"'", null, null, null, null);
    cursor2.moveToFirst();
    String Title = "";
    while (!cursor2.isAfterLast()) {
        Title = cursor2.getString(0);
        cursor2.moveToNext();
    }
    cursor2.close();
    return Title;
}

public static String getJournalEditorialBoard(int journalId){
    Cursor cursor2 = Database.query("editorialboard",
            EditorialBoard_All,"journalId like "+"'"+journalId+"'", null, null, null, null);
    cursor2.moveToFirst();
    String EditorialBoard = "";
    while (!cursor2.isAfterLast()) {
        EditorialBoard = cursor2.getString(2)+cursor2.getString(0)+cursor2.getString(1);
        cursor2.moveToNext();
    }
    cursor2.close();
    return EditorialBoard;
}

public static ArrayList<Subscription_Database> getAllSubscribedJournals() {
    ArrayList<Subscription_Database> journals = new ArrayList<Subscription_Database>();
    Cursor cursor = Database.query("subscriptions",
            SubscriptionCOL_JournalId,"", null, null, null, null);
    cursor.moveToFirst();
    while (!cursor.isAfterLast()) {
        Subscription_Database subscription = cursorToSubscriptions(cursor);
        journals.add(subscription);
        cursor.moveToNext();
    }
    cursor.close();
    return journals;
}

public static int getHistoryLastSuccessfullUpdate(){
    Cursor cursor2 = Database.query("history",
            HistoryCOL_LastSuccessfullUpdate,"", null, null, null, null);
    cursor2.moveToFirst();
    int lastSuccessfullUpdate = 0;
    lastSuccessfullUpdate = cursor2.getInt(0);
    cursor2.close();
    return lastSuccessfullUpdate;
}

public static int CheckMDPIPresence() 
{
    final SQLiteStatement stmt = 
    Database.compileStatement("SELECT COUNT(*) FROM mdpi");
    return (int) stmt.simpleQueryForLong();
}

public static String getJournalAimsAndScope(String journalNameShort)
{
    Cursor cursor2 = Database.query("journals",
            JournalCOL_Abaut,"nameSystem ="+"'"+journalNameShort+"'", null, null, null, null);
    cursor2.moveToFirst();
    String aimsAndScope = null;
    aimsAndScope = cursor2.getString(0);
    cursor2.close();
    return aimsAndScope;
}

public static int getJournalIdFromNameShort(String journalNameShort)
{
    Cursor cursor2 = Database.query("journals",
            JournalCOL_Id,"nameShort ="+"'"+journalNameShort+"'", null, null, null, null);
    cursor2.moveToFirst();
    int journalId = 0;
    while (!cursor2.isAfterLast()) {
        journalId = cursor2.getInt(0);
        cursor2.moveToNext();
    }
    cursor2.close();
    return journalId;
}

public static String getJournalNameShortFromNameSystem(String journalNameSystem)
{
    Cursor cursor2 = Database.query("journals",
            JournalCOL_NameShort,"nameSystem ="+"'"+journalNameSystem+"'", null, null, null, null);
    cursor2.moveToFirst();
    String journalNameShort = null;
    while (!cursor2.isAfterLast()) {
        journalNameShort = cursor2.getString(0);
        cursor2.moveToNext();
    }
    cursor2.close();
    return journalNameShort;
}

public static int getJournalIdFromNameSystem(String journalNameShort)
{
    Cursor cursor2 = Database.query("journals",
            JournalCOL_Id,"nameSystem ="+"'"+journalNameShort+"'", null, null, null, null);
    cursor2.moveToFirst();
    int journalId = 0;
    while (!cursor2.isAfterLast()) {
        journalId = cursor2.getInt(0);
        cursor2.moveToNext();
    }
    cursor2.close();
    return journalId;
}

public static boolean editorialBoardExistsAllready(int journalId) {
    final SQLiteStatement stmt = 
            Database.compileStatement("SELECT COUNT(*) FROM editorialboard WHERE journalId ="+journalId);
            long count= stmt.simpleQueryForLong();
    if (count==1)
        return true;
    else
    return false;
}

public  static String getEditorialboardValue(int journalId, String row) {
    String[] editorialBoardValue = {row};
    Cursor cursor = Database.query("editorialboard",
            editorialBoardValue, "journalId ="+journalId, null, null, null,null);
    cursor.moveToFirst();
    String result = "";
        result = cursor.getString(0);
    cursor.close();
    return result;
}

public static String getJournalISSNfromJournalId(int journalId){
    Cursor cursor2 = Database.query("journals",
            JournalCOL_ISSNelectronic,"journalId like "+journalId, null, null, null, null);
    cursor2.moveToFirst();
    String ISSNElectronic = null;
    while (!cursor2.isAfterLast()) {
        ISSNElectronic = cursor2.getString(0);
        cursor2.moveToNext();
    }
    cursor2.close();
    return ISSNElectronic;
}

public  static String getMDPIAbaut() {
    Cursor cursor = Database.query("mdpi",
            MDPIColAbaut,"", null, null, null, null);
    cursor.moveToFirst();
    String abaut = null;
    while (!cursor.isAfterLast()) {
        abaut = cursor.getString(0);        
        cursor.moveToNext();
    }
    cursor.close();
    return abaut;
}

public  static String getMDPIOpenAccess() {
    Cursor cursor = Database.query("mdpi",
            MDPIColOpenAccess,"", null, null, null, null);
    cursor.moveToFirst();
    String openAccess = null;
    while (!cursor.isAfterLast()) {
        openAccess = cursor.getString(0);       
        cursor.moveToNext();
    }
    cursor.close();
    return openAccess;
}

public  static ArrayList<String>  getOfficesHTML() {
    Cursor cursor = Database.query("offices",
            OfficesColHTML,"", null, null, null, null);
    cursor.moveToFirst();
    ArrayList<String> officesHTML = new ArrayList<String>();
    while (!cursor.isAfterLast()) {
        officesHTML.add(cursor.getString(0));       
        cursor.moveToNext();
    }
    cursor.close();
    return officesHTML;
}

public  static ArrayList<String>  getPublicJournalsNameSystem() {
    Cursor cursor = Database.query("journals",
            JournalCOL_NameSystem,"publicFlag like 1", null, null, null, "nameSystem");
    cursor.moveToFirst();
    ArrayList<String> publicJournalsNameSystem = new ArrayList<String>();
    while (!cursor.isAfterLast()) {
        publicJournalsNameSystem.add(cursor.getString(0));      
        cursor.moveToNext();
    }
    cursor.close();
    return publicJournalsNameSystem;
}

public  static ArrayList<String>  getPublicSearchedJournalsNameSystem(String journalName) {
    Cursor cursor = Database.query("journals",
            JournalCOL_NameSystem,"publicFlag like 1 AND nameSystem like "+journalName, null, null, null, "nameSystem");
    cursor.moveToFirst();
    ArrayList<String> publicJournalsNameSystem = new ArrayList<String>();
    while (!cursor.isAfterLast()) {
        publicJournalsNameSystem.add(cursor.getString(0));      
        cursor.moveToNext();
    }
    cursor.close();
    return publicJournalsNameSystem;
}

public  static ArrayList<String>  getPublicJournalsNameShort() {
    Cursor cursor = Database.query("journals",
            JournalCOL_NameShort,"publicFlag like 1", null, null, null, "nameShort");
    cursor.moveToFirst();
    ArrayList<String> publicJournalsNameShort = new ArrayList<String>();
    while (!cursor.isAfterLast()) {
        publicJournalsNameShort.add(cursor.getString(0));       
        cursor.moveToNext();
    }
    cursor.close();
    return publicJournalsNameShort;
}

public static String getHistoryLastSelectedJournalNameSystem(){
    Cursor cursor2 = Database.query("history",
            HistoryCOL_LastSelectedJournal,"", null, null, null, null);
    cursor2.moveToFirst();
    String lastSelectedJournal = null;

    lastSelectedJournal = cursor2.getString(0);
    cursor2.close();
    return lastSelectedJournal;
}

public static Journal_Database getHistoryLastSelectedJournal(String lastSelectedJournalNameSystem){
    Cursor cursor = Database.query("journals",
            JournalsCOL_All,"nameSystem like "+"'"+lastSelectedJournalNameSystem+"'", null, null, null, null);
    cursor.moveToFirst();
        Journal_Database lastSelectedJournal = cursorToJournals(cursor);
        cursor.moveToNext();
    cursor.close();
    return lastSelectedJournal;
}
private static Journal_Database cursorToJournals(Cursor cursor) {
    Journal_Database journal = new Journal_Database(0, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, null, 0, null, null);
    journal.setJournalID(cursor.getInt(0));
    journal.setNameFull(cursor.getString(1));
    journal.setNameShort(cursor.getString(2));
    journal.setNameSystem(cursor.getString(3));
    journal.setAbout(cursor.getString(4));
    journal.setNameIso4(cursor.getString(5));
    journal.setNamePubmed(cursor.getString(6));
    journal.setNamePubmedShort(cursor.getString(7));
    journal.setISSNElectronic(cursor.getString(8));
    journal.setCoden(cursor.getString(9));
    journal.setAPCChf(cursor.getString(10));
    journal.setAPCCny(cursor.getString(11));
    journal.setAPCEngChf(cursor.getString(12));
    journal.setAPCEngCny(cursor.getString(13));
    journal.setAPCFormatChf(cursor.getString(14));
    journal.setSCITracked(cursor.getString(15));
    journal.setImpactFactor(cursor.getString(16));
    journal.setImpactFactor5years(cursor.getString(17));
    journal.setImpactFactorYear(cursor.getString(18));
    journal.setEstablishedYear(cursor.getString(19));
    journal.setShortDescription(cursor.getString(20));
    journal.setAcceptedPapers(cursor.getString(21));
    journal.setStyleHeaderLight(cursor.getString(22));
    journal.setStyleHeaderDark(cursor.getString(23));
    journal.setForthcomingIssue(cursor.getString(24));
    journal.setContactEmail(cursor.getString(25));
    journal.setContactID(cursor.getString(26));
    journal.setPubfrequency(cursor.getString(27));
    journal.setPublicFlag(cursor.getInt(28));
    journal.setReviewRequestTime(cursor.getString(29));
    journal.setDOIAbbreviation(cursor.getString(30));
    return journal;
}
}
4

2 回答 2

1

您需要更改访问数据库的模式。

最重要的是，如果您没有它，请制作一个数据库助手。这样做的主要原因是可以同时访问数据库进行写入。SQLite 可以同时从 2 个地方进行写入访问。数据库助手会处理这个问题。

这是一个可能对您有所帮助的 DBHelper 代码示例。请注意，这是用于使用 ORMLite 库数据库助手，但它与常规助手几乎相同。

public class DatabaseHelper extends OrmLiteSqliteOpenHelper {

    private static final String DATABASE_NAME = "database.db";
    private static final int DATABASE_VERSION = 6;


    private static final AtomicInteger usageCounter = new AtomicInteger(0);
    // we do this so there is only one helper
    private static DatabaseHelper helper = null;

    /**
     * Use the {@link #DatabaseHelper(Context, String)}
     *
     * @param context
     */
    public DatabaseHelper(Context context) {
        super(context, DATABASE_NAME, null, DATABASE_VERSION, R.raw.ormlite_config);
    }

    @Override
    public void onCreate(SQLiteDatabase sqliteDatabase, ConnectionSource connectionSource) {
    }

    @Override
    public void onUpgrade(SQLiteDatabase sqliteDatabase, ConnectionSource connectionSource,
                }

    /**
     * Get the helper, possibly constructing it if necessary. For each call to this method, there
     * should be 1 and only 1 call to {@link #close()}.
     */
    public static synchronized DatabaseHelper getHelper(Context context) {
        if (helper == null) {
            initHelper(context);
        }
        usageCounter.incrementAndGet();
        return helper;
    }

    private static void initHelper(Context context) {
        helper = new DatabaseHelper(context);
        usageCounter.set(0);
    }


    /**
     * Close the database connections and clear any cached DAOs. For each call to
     * {@link #getHelper(Context)}, there should be 1 and only 1 call to this method. If there were
     * 3 calls to {@link #getHelper(Context)} then on the 3rd call to this method, the helper and
     * the underlying database connections will be closed.
     */
    @Override
    public void close() {
        if (usageCounter.decrementAndGet() <= 0) {
            super.close();
            helper = null;
        }
    }
}

因此，这显示了如何拥有一个打开的数据库实例并访问它。

每次你想进行一些数据库操作时调用 getHelper(context) 方法，完成后你必须调用 close。请注意，对于每个 getHelper 方法，您需要调用 close。因此，使用它的一种常见方法是在活动的 onCreate 中获取引用并在 onDestroy 中关闭它（也许制作一个抽象的基础活动来分组此功能）。

还要记住，即使在活动关闭后也可能存在的代码（例如异步任务）中单独使用它。

于 2012-06-21T06:40:11.037 回答
0

问题是你忘了打电话open()。

你从来没有调用过open()函数LocalDatabase

于 2012-06-21T06:53:53.033 回答