How to fix IntegrityError: FOREIGN KEY constraint failed in Python
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We're excited to share with you our newest video, "How to solve IntegrityError: FOREIGN KEY constraint failed in Python". 🎥 This series is meticulously designed to arm you with knowledge 🧠 and skills 🛠️ to overcome frequent coding challenges.
Today, we will decipher 🔎 and resolve a common error faced by Python coders: the bit hard to solve IntegrityError: FOREIGN KEY constraint failed. Here is a snapshot of the code of the video:
Troubling Scenario: ❗️
import sqlite3
Establish a connection to the database and create a cursor
conn = sqlite3.connect(':memory:')
cursor = conn.cursor()
Create tables
cursor.execute('CREATE TABLE parent (id INTEGER PRIMARY KEY)')
cursor.execute('CREATE TABLE child (id INTEGER, parent_id INTEGER, FOREIGN KEY(parent_id) REFERENCES parent(id))')
Attempt to insert data violating foreign key constraint
cursor.execute('INSERT INTO child (id, parent_id) VALUES (1, 1)') # No corresponding entry in parent
conn.commit() # This line will trigger the IntegrityError
Unwanted Result: 🚫
IntegrityError: FOREIGN KEY constraint failed
Effective Resolution: ✔️
import sqlite3
Establish a connection to the database and create a cursor
conn = sqlite3.connect(':memory:')
cursor = conn.cursor()
Enable foreign key constraint enforcement in SQLite
conn.execute('PRAGMA foreign_keys = ON')
Create tables
cursor.execute('CREATE TABLE parent (id INTEGER PRIMARY KEY)')
cursor.execute('CREATE TABLE child (id INTEGER, parent_id INTEGER, FOREIGN KEY(parent_id) REFERENCES parent(id))')
Insert data into parent table
cursor.execute('INSERT INTO parent (id) VALUES (1)')
Now insert data into child table
cursor.execute('INSERT INTO child (id, parent_id) VALUES (1, 1)')
conn.commit()
Desired Output: 🏁
There is no output because the code does not have any print statements or error statements that produce output. All operations (database setup, table creation, and data insertion) are completed successfully without any issues.
In this detailed walkthrough, we will illuminate 💡 the underlying cause of this error, and offer a comprehensive explanation: Code1 fails because it inserts a child with no existing parent due to no foreign key checks enabled by default. Code2 corrects this by enabling foreign key enforcement and adding a parent. 🎯
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