Updating SQL Table Data In Android Applcation

I'm trying to update my local android app database data , I used the update query:

    public void addQTY(String changedQTY, String changedPNAme)
{
    String addQuery = "UPDATE" + SQLITE_TABLE + 
            "SET"+ qty+"='"+ changedQTY +"'" +
            "WHERE" +PRODUCT_NAME + "='" + changedPNAme + "';";
    mDb.execSQL(addQuery);
}