Java MySQL SELECT查询未返回正确的INT

Question

我在Java应用程序中获取SELECT查询时遇到问题，无法返回正确的INT值。看起来它只返回INT为1，当它应该获取列中的INT时，如MySQL查询浏览器中运行的查询所示：

以下是导致问题的代码块。特别是“val =（rs.getInt（”quantity“））;”

附近的行

想知道我是否遗漏了一些完全明显的东西。以下是该方法的代码块的一部分：

    try {
    IItem Item = (IItem) pItem.getItem().copy();
    int ItemQuantity = pItem.getItem().getQuantity();
    int ItemId = pItem.getItem().getItemId();
    ResultSet rs = null;
    PreparedStatement ps;
    ps = DatabaseConnection.getConnection().prepareStatement("SELECT quantity FROM hiredmerchant WHERE ownerid = ? AND itemid = ? AND quantity = ?");
    ps.setInt(1, shopowner);
    ps.setInt(2, ItemId);
    ps.setInt(3, ItemQuantity);
    rs = ps.executeQuery();
    while (rs.next()) {
        int val;
        val = (rs.getInt("quantity"));
        System.out.println("Selected quantity of " + val + " from " + this.getOwnerName() + "'s merchant items: ");
        if (ItemQuantity == val) {
            try {
                PreparedStatement os;
                os = DatabaseConnection.getConnection().prepareStatement("DELETE FROM hiredmerchant WHERE ownerid = ? AND itemid = ? AND quantity = ?");
                os.setInt(1, shopowner);
                os.setInt(2, ItemId);
                os.setInt(3, ItemQuantity);
                os.executeUpdate();
                os.close();
            } catch (SQLException ex) {
                System.out.println("Error deleting quantity row from " + this.getOwnerName() + "'s merchant items: " + ex);
            }
        } else {
            try {
                PreparedStatement os;
                os = DatabaseConnection.getConnection().prepareStatement("UPDATE hiredmerchant SET quantity = quanity-(" + quantity + ") WHERE ownerid = ? AND itemid = ? AND quantity = ?");
                os.setInt(1, shopowner);
                os.setInt(2, ItemId);
                os.setInt(3, ItemQuantity);
                os.executeUpdate();
                os.close();
            } catch (SQLException ex) {
                System.out.println("Error deducting quantity from row of " + this.getOwnerName() + "'s merchant items: " + ex);
            }
        }
        ps.close();
    }
} catch (SQLException ex) {
   System.out.println("Error grabbing item quantity from " + this.getOwnerName() + "'s merchant items: " + ex);
}

如果我需要提供整个方法或更多信息，请告诉我。