android.database.sqlite.DatabaseObjectNotClosedException：應用程序未關閉在此處打開的遊標或數據庫對象

Question

這是我的SQLiteHeler.java類。

//tables name in database 
public static final String TABLE_NAME="Favtable"; 

//common column for all table 
public static final String KEY_ID="id"; 
//column in alumnitable 
public static final String KEY_CID="Courseid"; 
public static final String KEY_FavStatus="Status"; 

public SQLiteHelper(Context context) { 

    super(context, DATABASE_NAME, null, 1); 
} 

//create tables 
@Override 
public void onCreate(SQLiteDatabase database){ 

    String CREATE_NAME="CREATE TABLE IF NOT EXISTS "+TABLE_NAME+" ("+KEY_ID+" INTEGER PRIMARY KEY,"+KEY_CID+" VARCHAR, "+KEY_FavStatus+" VARCHAR)"; 
    database.execSQL(CREATE_NAME); 
    database.close(); 

} 
public void InsertData(int Courseid,int flag) 
{ 
    Cursor cursor = null; 
    SQLiteDatabase database = this.getReadableDatabase(); 
    cursor.moveToFirst(); 
    SQLiteQuery = "INSERT INTO FavTable (Courseid,Status) VALUES('" + Courseid + "', '" + flag + "');"; 
    database.execSQL(SQLiteQuery); 
    database.close(); 
} 
public void close() { 
    if (database != null) { 
     database.close(); 
    } 
} 

@Override 
public void onUpgrade(SQLiteDatabase database, int oldVersion, int newVersion) { 
    database.execSQL("DROP TABLE IF EXISTS "+TABLE_NAME); 

    onCreate(database); 
} 

}

什麼，我做錯了什麼？它給錯誤的

_android.database.sqlite.DatabaseObjectNotClosedException: Application did not close the cursor or database object that was opened here_ 

我打電話創建和創建對象插入SQLiteHelper的方式進入我的片段類。

這是我CourseFragment.java.here我打電話的onCreate和插入方法

alertDialogBu​​ilder.setPositiveButton（ 「是」， 新DialogInterface.OnClickListener（）{

        @Override 
            public void onClick(DialogInterface arg0, 
                 int arg1) { 
             flag = 1; 


             /*s1="true";*/ 
             Courseid = mCourse.getCourseid(); 

             mCourse.setIsFavCourse(!mCourse.getIsFavCourse()); 
             mCourse.save(); 

             // Update listview 
             mCourses.get(position).setIsFavCourse(
               mCourse.getIsFavCourse()); 
             courseListAdapter.notifyDataSetChanged(); 

           //Add courseid and status to database 
             favourite.onCreate(database); 
             favourite.InsertData(Courseid,flag); 

             // Start sync service for course 
             Intent i = new Intent(context, MDroidService.class); 

             i.putExtra("notifications", false); 
             i.putExtra("siteid", 
               session.getCurrentSiteId()); 
             i.putExtra("courseid", 
               mCourse.getCourseid()); 

             context.startService(i); 

            } 
           }); 

Answer 1

複製並運行後您的代碼然後修改它主要/初始問題是由於您在幫助程序的onCreate方法中創建它時關閉數據庫（在以下的代碼中註釋掉）

但是，根據評論還有其他問題，其中一些代碼可以解決。下面的代碼工作（只要解決你目前擁有的問題）： -

public class SQLiteHelper extends SQLiteOpenHelper { 

    public static final String DATABASE_NAME = "Courses"; 

    //tables name in database 
    public static final String TABLE_NAME="Favtable"; 

    //common column for all table 
    public static final String KEY_ID="_id"; 
    //column in alumnitable 
    public static final String KEY_CID="Courseid"; 
    public static final String KEY_FavStatus="Status"; 

    public SQLiteHelper(Context context) { 

     super(context, DATABASE_NAME, null, 1); 
    } 

    //create tables 
    @Override 
    public void onCreate(SQLiteDatabase database){ 

     String CREATE_NAME="CREATE TABLE IF NOT EXISTS "+TABLE_NAME+" ("+KEY_ID+" INTEGER PRIMARY KEY,"+KEY_CID+" VARCHAR, "+KEY_FavStatus+" VARCHAR)"; 
     database.execSQL(CREATE_NAME); 
     //database.close(); 

    } 
    public void InsertData(int Courseid,int flag) 
    { 
     SQLiteDatabase database = this.getWritableDatabase(); 
     String SQLiteQuery = "INSERT INTO FavTable (Courseid,Status) VALUES('" + Courseid + "', '" + flag + "');"; 
     database.execSQL(SQLiteQuery); 
    } 


    @Override 
    public void onUpgrade(SQLiteDatabase database, int oldVersion, int newVersion) { 
     database.execSQL("DROP TABLE IF EXISTS "+TABLE_NAME); 
     onCreate(database); 
    } 
} 

下面是我在活動中使用的代碼/電話： -

SQLiteHelper mydb = new SQLiteHelper(this); 
    mydb.InsertData(0,10); 
    mydb.close(); 

你不應該有這一行代碼（如貼我回答後）： -

favourite.onCreate(database);