Python3 and Sqlite3 can't Insert - python-3.x

Question

I am trying to write a function to do a simple insert.
Here is what I have tried so far
#! /usr/bin/env python3
#import
import sqlite3 as lite
#trying an insert version 1 (does nothing)
def createTableTask():
"""
Create a new table with the name Task
"""
#Connnection to the database and cursor creation
con = lite.connect('./exemple.sqlite')
con.row_factory = lite.Row
cur = con.cursor()
#that does nothing
try:
cur.execute('''CREATE TABLE Tasks (\
Name TEXT PRIMARY KEY, \
Description TEXT, \
Priority TEXT);''')
except lite.IntegrityError as error_SQLite:
print("error: "+ str(error_SQLite))
else:
print("No error has occured.")
con.close();
def insert1():
"""
insert a new task
"""
#Allocating variables data
taskName = 'finish code'
taskDescription = 'debug'
taskPriority = 'normal'
#Connnection to the database and cursor creation
con = lite.connect('./exemple.sqlite')
con.row_factory = lite.Row
cur = con.cursor()
#that does nothing
try:
with con:
cur.execute('''INSERT INTO Tasks (Name, Description, Priority) \
VALUES (?, ?, ?)''', (taskName, taskDescription, taskPriority))
except lite.IntegrityError as error_SQLite:
print("error: "+ str(error_SQLite))
else:
print("No error has occured. but no insert happend ?")
con.close();
def showResult():
"""
Show the result of the insert
"""
con = lite.connect('./exemple.sqlite')
con.row_factory = lite.Row
cur = con.cursor()
cur.execute\
('''SELECT * FROM Tasks ;''')
row = cur.fetchone()
while row:
print(row["Name"], ' | ', row["Description"], ' | ', \
row["Priority"])
row = cur.fetchone()
con.close();
#trying an insert version 2 (this one crash giving :Value error)
def insert2():
"""
insert a new task
"""
#Allocating variables data
taskName = 'finish code'
taskDescription = 'debug'
taskPriority = 'normal'
#Connnection to the database and cursor creation
con = lite.connect('./exemple.sqlite')
con.row_factory = lite.Row
cur = con.cursor()
queryInsert = ('''INSERT INTO Tasks (Name, Description, Priority) \
VALUES (?, ?, ?)''', (taskName, taskDescription, taskPriority))
try:
with con:
cur.execute(queryInsert)
except lite.IntegrityError as error_SQLite:
print("error: "+ str(error_SQLite))
else:
print("No error has occured.")
con.close();
def run():
createTableTask()
insert1()
showResult()
insert2()
showResult()
#calling section
run()
The problem is that none of the insert that I have made so far worked.
The first one does actualy nothing but has a correct syntax
The second one, well it crash.
Here is the output:
spark#spark-Razer-Blade-Pro:~/Documents/testing$ ./exemp.py
No error has occured.
No error has occured. but no insert happend ?
Traceback (most recent call last):
File "./exemp.py", line 98, in
run()
File "./exemp.py", line 94, in run
insert2()
File "./exemp.py", line 83, in insert2
cur.execute(queryInsert)
ValueError: operation parameter must be str
spark#spark-Razer-Blade-Pro:~/Documents/testing$ sqlite3 exemple.sqlite
SQLite version 3.8.2 2013-12-06 14:53:30
Enter ".help" for instructions
Enter SQL statements terminated with a ";"
sqlite> SELECT * FROM Tasks;
sqlite>
I am looking for the most simple fix and maybe know what is wrong with my code. Because Right now I do not know what is going on with the no insert one. Normally it should, or am I missing something ?

Answer 1

queryInsert = ('''INSERT ...''', (taskName, taskDescription, taskPriority))
This makes queryInsert a tuple with two elements.
But to call the execute method, you need two separate parameters.
You could just unpack the tuple:
cur.execute(*queryInsert)
but it might be clearer to use two separate variables:
queryString = '''INSERT ...'''
queryParams = (taskName, taskDescription, taskPriority)
cur.execute(queryString, queryParams)

Answer 2

ok I got around my error. Just posting it because it might help others.
cur.execute() is a fonction that seek a query as it's first argument, than the other argument are the variables needed for the query.
step one: make the query into a variable without it's parameters
queryString = ''' INSERT INTO someTables rowName, rowName2 ... VALUES (?, ?);'''
there should be as much as ? as there are variables needed. in this exemple I need 2
queryValue1 = 'something'
queryValue2 = '123'
Step 2 to call and execute the query :
cur.execute(queryString, queryValue1, queryValue2)
this should be working without problem