Question

Can someone explain how the delete actually works, as the documentation isn’t providing me with enough help. What i’m trying to do is delete all rows from my table where the date matches the one i provide in the delete method.

This is what i’ve tried:

SQLiteDatabase db = appts.getWritableDatabase();

    String whereclause = "WHERE DATE = ";

    long seldate = calendar.getDate()/1000;
    String datestodelete = new java.text.SimpleDateFormat("dd/MM/yyyy").format(new java.util.Date (seldate*1000));

    db.delete(TABLE_NAME, whereclause, datestodelete);

But it says String String String isnt accepted for that method, what would i put in instead?

Answer 1

The third argument should be of type String[], not String:

public int delete (String table, String whereClause, String[] whereArgs)

Your table, whereClause, and whereArgs should be formatted as follows:

table = "table_name";
whereClause = "col1 = ? AND col2 = ?";
whereArgs = new String[] { date1, date2 };

In other words, the values in the String[] will replace the ?s in your whereClause. Also note that you should omit the WHERE at the beginning of your whereClause (this will be added automatically when Android performs the delete).