I'm putting together a mysql database to drive a web app i'm working on to keep track of your daily intake of calories, carbs, etc...)
A quick explanation of my design intentions:
I want to store an entry(date, time, item) for everything I eat. The item can be either a single item or a combo.
I have created a table for items and table for combos. A combo is several items that have been packages together. The combo use another table to track which itms are in a combo.
here is my db structure and a few insert statements to put it into context
Question 1) does it make sense to store the combo items like that?
Question 2) If I store them as it is how to I join the entry table with both the combo and item tables so I can get the names and calories from both types of entries? If I use something like this I don't get anything back because an entry does not have both an item and a combo
A quick explanation of my design intentions:
I want to store an entry(date, time, item) for everything I eat. The item can be either a single item or a combo.
I have created a table for items and table for combos. A combo is several items that have been packages together. The combo use another table to track which itms are in a combo.
here is my db structure and a few insert statements to put it into context
Code:
-- ------------------------------------------------------
-- Table structure for item
-- -------------------------------------------------------
CREATE TABLE item (
`item_id` int(11) NOT NULL AUTO_INCREMENT,
`item_name` varchar(40) COLLATE utf8_unicode_ci NOT NULL,
`item_desc` varchar(300) COLLATE utf8_unicode_ci DEFAULT NULL,
`item_calories` int(4) COLLATE utf8_unicode_ci,
`item_carbs` int(4) COLLATE utf8_unicode_ci,
`item_fat` int(4) COLLATE utf8_unicode_ci,
`item_protein` int(4) COLLATE utf8_unicode_ci,
PRIMARY KEY (`item_id`)
);
INSERT INTO item(item_name, item_desc, item_calories, item_carbs ) VALUES ('Advocare Fiber Drink', 'Advocare Fiber Drink Dietary Suppliment', 70, 17);
INSERT INTO item(item_name, item_desc, item_calories, item_carbs, item_fat, item_protein ) VALUES ('Advocare Meal Replacement Shake (Choc Mocha)', 'Advocare Meal Replacement Shake - Chocolate Mocha', 220, 24, 3, 24);
INSERT INTO item(item_name, item_desc, item_calories, item_carbs, item_fat, item_protein ) VALUES ('Advocare SPARK Energy Drink', 'Advocare SPARK Energy Drink', 45, 11, 0, 0);
INSERT INTO item(item_name, item_desc, item_calories, item_carbs, item_fat, item_protein ) VALUES ('Slice Wheat Bread(Giant Eagle)', 'Giant Eagle Whole Wheat Calcium Rich Bread', 100, 20, 1.5, 5);
INSERT INTO item(item_name, item_desc, item_calories, item_carbs, item_fat, item_protein ) VALUES ('Peanut Butter(2Tbsp Jif-Creamy)', 'JIF Creamy Peanut Butter', 190, 140, 16, 7);
INSERT INTO item(item_name, item_desc, item_calories, item_carbs, item_fat, item_protein ) VALUES ('Jam (1 Tbsp Smuckers Concord Grape)', 'Smuckers Concord Grape Jam', 50, 13, 0, 0);
INSERT INTO item(item_name, item_desc, item_calories, item_carbs, item_fat, item_protein ) VALUES ('Chicken Caeser Salad', 'Description of Chicken Caeser Salad', 300, 16, 4, 8);
-- ------------------------------------------------------
-- Table structure for combo -
-- -------------------------------------------------------
CREATE TABLE combo (
`combo_id` int(11) NOT NULL AUTO_INCREMENT,
`combo_name` varchar(40) COLLATE utf8_unicode_ci NOT NULL,
`combo_desc` varchar(300) COLLATE utf8_unicode_ci DEFAULT NULL,
PRIMARY KEY (`combo_id`)
);
INSERT INTO combo(combo_id, combo_name, combo_desc) VALUES (1, 'PB&J Sandwich', 'PB&J Sandwich');
-- ------------------------------------------------------
-- Table structure for jobs
-- -------------------------------------------------------
CREATE TABLE combo_items (
`ci_id` int(11) NOT NULL AUTO_INCREMENT,
`ci_combo_id` int(11) NOT NULL,
`ci_item_id` int(11) NOT NULL,
PRIMARY KEY (`ci_id`),
FOREIGN KEY(`ci_combo_id`) REFERENCES combo(`combo_id`),
FOREIGN KEY(`ci_item_id`) REFERENCES item(`item_id`)
);
INSERT INTO combo_items(ci_combo_id, ci_item_id) VALUES (1,4);
INSERT INTO combo_items(ci_combo_id, ci_item_id) VALUES (1,4);
INSERT INTO combo_items(ci_combo_id, ci_item_id) VALUES (1,5);
INSERT INTO combo_items(ci_combo_id, ci_item_id) VALUES (1,6);
-- ------------------------------------------------------
-- Table structure for jobs
-- Standard format: HH:MM:SS '12:10:00'
-- Extended hour format: HHH:MM:SS '340:10:00'
-- -------------------------------------------------------
CREATE TABLE entry (
`entry_id` int(11) NOT NULL AUTO_INCREMENT,
`entry_date` date NOT NULL,
`entry_time` time NOT NULL default '00:00:00',
`entry_combo_id` int(11) DEFAULT NULL,
`entry_item_id` int(11) DEFAULT NULL,
PRIMARY KEY (`entry_id`),
FOREIGN KEY(`entry_combo_id`) REFERENCES combo(`combo_id`),
FOREIGN KEY(`entry_item_id`) REFERENCES item(`item_id`)
);
INSERT INTO entry(entry_date, entry_time, entry_item_id ) VALUES ('2012/11/13','8:00:00', 1);
INSERT INTO entry(entry_date, entry_time, entry_item_id ) VALUES ('2012/11/13','8:30:00', 3);
INSERT INTO entry(entry_date, entry_time, entry_item_id ) VALUES ('2012/11/13','13:30:00', 2);
INSERT INTO entry(entry_date, entry_time, entry_item_id ) VALUES ('2012/11/13','18:00:00', 2);
INSERT INTO entry(entry_date, entry_time, entry_combo_id ) VALUES ('2012/11/13','21:00:00', 1);Question 2) If I store them as it is how to I join the entry table with both the combo and item tables so I can get the names and calories from both types of entries? If I use something like this I don't get anything back because an entry does not have both an item and a combo
Code:
-- query entry and their item/combo name
select entry.entry_date, entry.entry_time, item.item_name
from entry
inner join item
on entry.entry_item_id = item.item_id
inner join combo
on entry.entry_combo_id = combo.combo_id;