sqlite3 update/adding data to new column - python-3.x

Question

I made new column with NULL values called 'id' in table. Now I want to add data to it from list. It holds about 130k elements.
I tried with insert, it returned error:
conn = create_connection(xml_db)
cursor = conn.cursor()
with conn:
cursor.execute("ALTER TABLE xml_table ADD COLUMN id integer")
for data in ssetId:
cursor.execute("INSERT INTO xml_table(id) VALUES (?)", (data,))
conn.commit()
I also tried with update:
conn = create_connection(xml_db)
cursor = conn.cursor()
with conn:
cursor.execute("ALTER TABLE xml_table ADD COLUMN id INTEGER")
for data in ssetId:
cursor.execute("UPDATE xml_table SET ('id' = ?)", (data,))
conn.commit()
What is incorrect here ?
EDIT for clarification.
The table was already existing, filled with data. I want to add column 'id' with custom values to it.

Answer 1

Heres an example similar to yours which may be useful.
import sqlite3
conn = sqlite3.connect("xml.db")
cursor = conn.cursor()
with conn:
# for testing purposes, remove this or else the table gets dropped whenever the file is loaded
cursor.execute("drop table if exists xml_table")
# create table with some other field
cursor.execute("create table if not exists xml_table (other_field integer not null)")
for other_data in range(5):
cursor.execute("INSERT INTO xml_table (other_field) VALUES (?)", (other_data,))
# add id field
cursor.execute("ALTER TABLE xml_table ADD COLUMN id integer")
# make sure the table exists
res = cursor.execute("SELECT name FROM sqlite_master WHERE type='table'")
print("Table Name: {}".format(res.fetchone()[0]))
# add data to the table
for data in range(5):
cursor.execute("UPDATE xml_table SET id = ? WHERE other_field = ?", (data, data))
# if you must insert an id, you must specify a other_field value as well, since other_field must be not null
cursor.execute("insert into xml_table (id, other_field) VALUES (? ,?)", (100, 105))
# make sure data exists
res = cursor.execute("SELECT id, other_field FROM xml_table")
for id_result in res:
print(id_result)
conn.commit()
conn.close()
As I stated in the comment below, since one of your rows has a NOT NULL constraint on it, no rows can exist in the table that have that column NULL. In the example above other_field is specified NOT NULL, therefore there can be no rows that have NULL values in the column other_field. Any deviation from this would be an IntegrityError.
Output:
Table Name: xml_table
(0, 0)
(1, 1)
(2, 2)
(3, 3)
(4, 4)
(100, 105)