I'm creating an application and I have problems with Cursor
. I have an SQLiteDatabase
that returns me a Cursor
when I try to fetch the values with this function:
public Cursor fetchOption(long rowId) throws SQLException { Cursor mCursor = mDb.query(true, DATABASE_TABLE, new String[] {KEY_ROWID, KEY_TITLE, KEY_BODY}, KEY_ROWID + "=" + rowId, null, null, null, null, null); if (mCursor != null) { mCursor.moveToFirst(); } return mCursor; }
I don't know how to obtain the value of the field in the Cursor
. If I do that like so:
String a = mOptionDb.fetchOption(0).getColumnName(0).toString(); String b = mOptionDb.fetchOption(0).getColumnName(1).toString(); String c = mOptionDb.fetchOption(0).getColumnName(2).toString();
I only obtain the name of the columns (_id, title, body
) but not the values. Any suggestions on how to achieve this?
This interface provides random read-write access to the result set returned by a database query. Cursor implementations are not required to be synchronized so code using a Cursor from multiple threads should perform its own synchronization when using the Cursor.
I think you can forget about checking for null.
Instead check if there is data and then access the columns using the cursor:
Cursor cursor = fetchOption(0); if (cursor.moveToFirst()) // data? System.out.println(cursor.getString(cursor.getColumnIndex("title")); cursor.close(); // that's important too, otherwise you're gonna leak cursors
It might also make sense to read an Android tutorial. The notepad tutorial seems to fit the bill: http://developer.android.com/guide/tutorials/notepad/index.html
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