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diet3.py
#!/usr/bin/env python3.7
# Copyright 2020, Gurobi Optimization, LLC
# Use a SQLite database with the diet model (dietmodel.py). The database
# (diet.db) can be recreated using the included SQL script (diet.sql).
#
# Note that this example reads an external data file (..\data\diet.db).
# As a result, it must be run from the Gurobi examples/python directory.
import os
import sqlite3
import dietmodel
import gurobipy as gp
con = sqlite3.connect(os.path.join('..', 'data', 'diet.db'))
cur = con.cursor()
cur.execute('select category,minnutrition,maxnutrition from categories')
result = cur.fetchall()
categories, minNutrition, maxNutrition = gp.multidict(
(cat, [minv, maxv]) for cat, minv, maxv in result)
cur.execute('select food,cost from foods')
result = cur.fetchall()
foods, cost = gp.multidict(result)
cur.execute('select food,category,value from nutrition')
result = cur.fetchall()
nutritionValues = dict(((f, c), v) for f, c, v in result)
con.close()
dietmodel.solve(categories, minNutrition, maxNutrition,
foods, cost, nutritionValues)
