DateExpiry in Sqlite3 Python

问题

I try to figure out how to write function with SQLite3 statement which is responsible for informing me about expiry date of any medicine in advance let's suppose 30 days. I did sth like this but it doesn't work properly

l1top = Label(fr,text="Number of serie:")
l1top.grid(row=0,column=0,padx=20,sticky=E,pady=10)
l2top = Label(fr,text="Name of medicine:")
l2top.grid(row=1,column=0,padx=20,sticky=E,pady=10)
l3top = Label(fr,text="Dose")
l3top.grid(row=3,column=0,padx=20,sticky=E,pady=10)
l4top = Label(fr,text="Type of medicine")
l4top.grid(row=4,column=0,padx=20,sticky=E,pady=10)
l5top = Label(fr,text="Packages:")
l5top.grid(row=5,column=0,padx=20,sticky=E,pady=10)
l5top = Label(fr,text="Bottles:")
l5top.grid(row=6,column=0,padx=20,sticky=E,pady=10)
l6top = Label(fr,text="Expiry Date:")
l6top.grid(row=7,column=0,padx=20,sticky=E,pady=10)
def expiry():
    conn = sqlite3.connect("pharmacy.db")
    cur = conn.cursor()
    cur.execute('SELECT date FROM medicine WHERE date <= 30')
    matched = [rec[0] for rec in cur]
    conn.close()
    items = [row for row in tree.get_children() if tree.item(row, 'values')[6] in matched]
    tree.selection_set(items)
expiry()

The code above doesn't select properly because it matches only according to days but it does not include the whole date from the widget DateEntry(below). How to rewrite the SQLite statement that it grabs the whole date and matches all products with date which expiry ends in 30 days and highlights on red the last column ([6]) with date.

e6 = DateEntry(fr,width=12,bg="darkblue",fg="white",year=2020,state="readonly",date_pattern="dd/mm/yyyy",textvariable=six)
e6.grid(row=7,column=1,pady=10)

回答1:

If the format of the column date is DD-MM-YYYY, first you must change it to YYYY-MM-DD, because this is the only valid format for SQLite:

UPDATE medicine 
SET date = SUBSTR(date, -4) || '-' || SUBSTR(date, 4, 2) || '-' || SUBSTR(date, 1, 2);

and then use the function DATE() to get the rows where date is between now and now + 30 days:

SELECT date 
FROM medicine 
WHERE date BETWEEN DATE('now') AND DATE('now', '+30 day')

来源：https://stackoverflow.com/questions/63088753/dateexpiry-in-sqlite3-python

标签

python

sqlite

date

tkinter