Question

我在android中开发简单的应用程序。它执行成功，但不幸的是它停止了一段时间并抛出错误，如这些

数据库SQLiteConnection的{{1}}对象泄露了！请修复您的应用程序以正确结束正在进行的事务，并在不再需要时关闭数据库。

我该怎么做以避免上述错误

这是我的db代码：

'/data/data/com.h2o/databases/MyDBName.db'

AddressFragment.java：

public class DBHelper extends SQLiteOpenHelper {

    public static final String DATABASE_NAME = "MyDBName.db";
    public static final String ADDRESS_TABLE_NAME = "address";
    public static final String ADDRESS_COLUMN_ID = "id";
    public static final String ADDRESS_COLUMN_ADDRESSTYPE = "addrtype";
    public static final String ADDRESS_COLUMN_LINE1 = "line1";
    public static final String ADDRESS_COLUMN_LINE2 = "line2";
    public static final String ADDRESS_COLUMN_CITY = "city";
    public static final String ADDRESS_COLUMN_ZIPCODE = "zipcode";
    public static final String ADDRESS_COLUMN_COUNTRY = "country";
    public static final String ADDRESS_COLUMN_STATE = "state";
    public static final String ADDRESS_COLUMN_LANDMARK = "landmark";



    //private HashMap hp;

    public DBHelper(Context context)
    {
        super(context, DATABASE_NAME, null, 1);
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        // TODO Auto-generated method stub
        db.execSQL(
                "create table address " +
                        "(id integer primary key autoincrement,addrtype text not null unique, line1 text not null,line2 text not null,city text not null,zipcode text not null, country textnot null,state text not null,landmark text)"
        );



    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        // TODO Auto-generated method stub
        db.execSQL("DROP TABLE IF EXISTS address");

        onCreate(db);

    }

    public boolean insertAddress(String addrtype, String line1, String line2, String city, String zipcode, String country, String state, String landmark)
    {

        SQLiteDatabase db;

        db= this.getWritableDatabase();
        ContentValues contentValues = new ContentValues();
        contentValues.put("addrtype", addrtype);
        contentValues.put("line1", line1);
        contentValues.put("line2", line2);
        contentValues.put("city", city);
        contentValues.put("zipcode", zipcode);
        contentValues.put("country", country);
        contentValues.put("state", state);
        contentValues.put("landmark", landmark);

        String selectQuery = "select * from address where addrtype ='"+addrtype+"'";
        Cursor cursor = db.rawQuery(selectQuery,null);

        if (cursor.getCount()==1){

            db.update("address",contentValues,"addrtype ='"+addrtype+"'",null);
            return true;
        }
        else {

            db.insert("address", null, contentValues);
            return true;
        }

    }


    public Cursor getData(int id){
        SQLiteDatabase db = this.getReadableDatabase();
        Cursor res =  db.rawQuery( "select * from address where id="+id+"", null );
        return res;
    }

    public int numberOfRows(){
        SQLiteDatabase db = this.getReadableDatabase();
        int numRows = (int) DatabaseUtils.queryNumEntries(db, ADDRESS_TABLE_NAME);
        return numRows;
    }

    public boolean updateAddress (Integer id,String addrtype, String line1, String line2, String city, String zipcode,String country,String state,String landmark)
    {
        SQLiteDatabase db = this.getWritableDatabase();
        ContentValues contentValues = new ContentValues();
        contentValues.put("addrtype", addrtype);
        contentValues.put("line1", line1);
        contentValues.put("line2", line2);
        contentValues.put("city", city);
        contentValues.put("zipcode", zipcode);
        contentValues.put("country", country);
        contentValues.put("state", state);
        contentValues.put("landmark", landmark);
        db.update("address", contentValues, "id = ? ", new String[] { Integer.toString(id) } );
        return true;
    }

    public Integer deleteAddress (Integer id)
    {
        SQLiteDatabase db = this.getWritableDatabase();
        return db.delete("address",
                "id = ? ", new String[] { Integer.toString(id) });
    }

    public ArrayList<String> getAllAddress()
    {
        ArrayList<String> array_list = new ArrayList<String>();

        //hp = new HashMap();
        SQLiteDatabase db = this.getReadableDatabase();
        Cursor res =  db.rawQuery( "select * from address", null );
        res.moveToFirst();

        while(res.isAfterLast() == false){
            array_list.add(res.getString(res.getColumnIndex(ADDRESS_COLUMN_ADDRESSTYPE)));
            res.moveToNext();
        }
        return array_list;
    }



}

请有人解决它！

提前致谢

Answer 1

我认为您收到此错误是因为您没有关闭＆＃39;光标＆＃39;宾语。完成后，每个光标应该关闭。安全的方法是：

Cursor res =  db.rawQuery( "select * from address", null);
    try {
        // read data from the cursor in here
    } finally {
        res.close();
    }

Answer 2

我是这样用的：

@Override
    protected void onDestroy () {
        super.onDestroy();
        //myDb is Database Helper Class
        if(myDb.getReadableDatabase().isOpen())myDb.getReadableDatabase().close();
        if(myDb.getWritableDatabase().isOpen())myDb.getWritableDatabase().close();
    }

如何正确结束正在进行的事务并关闭Android中的数据库？

2 个答案: