use oracle command line

with tables such category(catNo,catogeryName)

Items(itemNo,ItemName,Price,total_quantiy, catNo)

. Create database package pointOfSal which contain the following

procedure to add new item(ItemName,Price,total_quantity, category name) which use validation method checkExistingitem using exception to validate item name if its not exists before ,then add this category and generate the item number automatically using database trigger , Note create method getCatgeoryNo(category name) to return category number to be used when item is added , this method will return -1 if category name not exists , and the procedure addItem will display message that one item record has been added or this category not exists or this item is exists before .