Updated this version of Python Teaching Code with latest files

Author: dominict

.DS_Store

@@ -0,0 +1,156 @@
+''' This is a simple vaccine management system using SQLite. 
+    It demonstrates the capabilities of SQLite. It is not intended for production environments.
+    For example, the changemade variable does not update once the program is started.
+    So, if someone left the application open for a long time and made changes later, the data would not be accurate.
+    '''
+import sqlite3
+#importing Error this way let's us refer to it by this name instead of sqlite3.Error
+from sqlite3 import Error 
+import datetime
+#if you code is not connecting to the DB, uncomment the next three lines and read the comments. Also, you may need \ instead of / before the DB file name in windows
+#import os
+#path_root = os.path.dirname(os.path.abspath(__file__)) #grab the file system path to the current script file
+#database_file_path = str(path_root)+"/myinventory.db" #construct the path to the database file (only necessary if the current working directory is not the same as the folder where this Python file is located.)
+#if you uncomment the three lines above, be sure to comment out this next line
+database_file_path = "myinventory.db"
+def create_connection(db_file):
+    """ create a database connection to the SQLite database
+        specified by the db_file
+    :param db_file: database file
+    :return: Connection object or None
+    """
+    try:
+        connection = sqlite3.connect(db_file)
+        return connection
+    except Error as e:
+        print(e)
+        return None
+
+def insert_data():
+    name = input("Enter the name of the item: ")
+    ndc = input("Enter the national drug code of the item: ")
+    location = input ("Enter the item inventory location: ")
+    availability = input("Enter number of doses left: ")
+    arrivaldate = input("Enter arrival date: ")
+    expirationdate = input("Enter expiration date: ")
+    changemade = str(now.year) +"/"+str(now.month) +"/"+str(now.day)
+    try:      
+        sqlresult = conn.execute("INSERT INTO vaccines (name,ndc,location,availability,arrivaldate,expirationdate,changemade)\
+            values("+"'"+ str(name) +"'" + ",'"+ str(ndc) +"', '"+ str(location) +"','"+ str (availability)+"','"+str(arrivaldate)+"','"+ str (expirationdate)+"','"+str(changemade)+"')")
+        result = conn.commit() #this actually runs the SQL and inserts the data into the database
+        if result == None:
+            print("*** Data saved to database. ***")
+    except Error as e:
+        print ("*** Insert error: ",e)
+        pass
+                                 
+def view_data():
+    try:
+        cursor = conn.execute ("SELECT id,name, ndc,location,availability,arrivaldate, expirationdate,changemade FROM vaccines" )
+        alldata = []
+        alldata.append(["ID","Name","NDC","Location","Availability","Arrival Date","Expiration Date","Last Update"])
+        for row in cursor:
+            thisrow=[]
+            for x in range(8):
+                thisrow.append(row[x])
+            alldata.append(thisrow)
+        return alldata
+    except Error as e:
+        print (e)
+        pass
+
+def update_data():
+    for row in view_data():
+            thisrow = "  --> "
+            for item in row:
+                thisrow += str(item) + "  "
+            print (thisrow)
+    update_ID = input("Enter the ID of the data record to edit: ")
+    print('''
+        1 = edit name
+        2 = edit ndc
+        3 = edit location
+        4 = edit availability
+        5 = edit arrivaldate
+        6 = edit expirationdate''')
+
+    feature = input("Enter which feature of the data do you want to edit: ")
+    update_value = input ("Editing "+feature+ ": enter the new value: ")
+
+    if(feature == "1"):
+        sql = "UPDATE vaccines set name = ? where id =  ?"
+    elif (feature == "2"):
+       sql = "UPDATE vaccines set ndc = ? where id =  ?" 
+    elif (feature == "3"):
+       sql = "UPDATE vaccines set location  = ? where id =  ?"
+    elif (feature == "4"):
+       sql = "UPDATE vaccines set availability  = ? where id =  ?"
+    elif (feature == "5"):
+       sql = "UPDATE vaccines set arrivaldate  = ? where id =  ?"
+    elif (feature == "6"):
+       sql = "UPDATE vaccines set expirationdate = ? where id =  ?"  
+        
+    try:
+        #if we call the connection execute method it invisibly creates a cursor for us
+        conn.execute(sql, (update_value,update_ID))
+        #update the change made date log
+        sql = "UPDATE vaccines set changemade = ? where id =  ?"
+        changemade = str(now.year) +"/"+str(now.month) +"/"+str(now.day)
+        conn.execute(sql, (changemade,update_ID)) 
+        
+    except Error as e:
+        print(e)
+        pass
+
+def delete_data():
+    id_  =  input("Enter the ID for the data record to delete:")
+    cursor = conn.cursor() #This sets a spot in the database connection (cursor) for targeted retrieval
+    cursor.execute("select name from vaccines where ID = "+id_) #create an object referencing the data
+    delete_item = cursor.fetchall() # get the data
+    confirm = input("Are you sure you want to delete " + id_ + " " + str(delete_item[0]) + "? (Enter 'y' to confirm.)")
+    if confirm.lower() == "y":
+        try:
+            delete_sql = "DELETE FROM vaccines WHERE id = ?"
+            conn.execute(delete_sql,id_)
+            result = conn.commit() #capture the result of the commit and use it to check the result
+            if result == None:
+                print (id_ + " " + str(delete_item[0]) + " deleted.")
+            else:
+                print ("Deletion failed during SQL execution.")
+        except Error as e:
+            print (e)
+            pass
+    else:
+        print("Deletion aborted.")
+
+conn = create_connection(database_file_path)
+now = datetime.datetime.now()
+
+if conn:
+    print ("Connected to database: ",conn)  
+else:
+    print("Error connecting to database.")
+
+while True:
+    print("Welcome to the Vaccine Management System!")
+    print("1 to view the data")
+    print("2 to insert a new data record")
+    print("3 to update a data record")
+    print("4 to delete a data record")
+    print("X to exit")
+    name = input ("Choose an operation to perform: ")
+    if (name =="1"):
+        for row in view_data():
+            thisrow = "  --> "
+            for item in row:
+                thisrow += str(item) + "  "
+            print (thisrow)
+    elif(name == "2"):
+        insert_data()
+    elif(name == "3"):
+        update_data()
+    elif(name == "4"):
+        delete_data()
+    elif(name == "X"):
+        conn.close()
+        break