26 lines
591 B
Markdown
26 lines
591 B
Markdown
|
---
|
||
|
|
tags: [databases, SQL, SQLite]
|
||
|
|
created: Wednesday, November 13, 2024
|
||
|
|
---
|
||
|
|
|
||
|
|
# SQLite
|
||
|
|
|
||
|
|
## Enabling foreign key constraints
|
||
|
|
|
||
|
|
Foreign key constraints are not enabled by default - it is very permissive. You
|
||
|
|
must manually turn them on, as part of the connection process:
|
||
|
|
|
||
|
|
```py
|
||
|
|
connection = sqlite3.connect("my_database.db")
|
||
|
|
connection.execute("PRAGMA foreign_keys = ON")
|
||
|
|
```
|
||
|
|
|
||
|
|
## INSERT OR IGNORE INTO
|
||
|
|
|
||
|
|
If table has a `UNIQUE` constraint on a field, insert if it is unique otherwise
|
||
|
|
skip without throwing a constraint error.
|
||
|
|
|
||
|
|
```sql
|
||
|
|
INSERT OR IGNORE INTO table_name (value) VALUES (:value)
|
||
|
|
```
|