---
name: sqlite-ops-df940d65caac
description: "Patterns for SQLite databases in Python projects - state management, caching, and async operations. Triggers on: sqlite, sqlite3, aiosqlite, local database, database schema, migration, wal mode."
license: MIT
compatibility: "Requires Python 3.8+ with sqlite3 (standard library) or aiosqlite for async."
allowed-tools: "Read Write Bash"
metadata:
  author: claude-mods
---

# SQLite Operations

Patterns for SQLite databases in Python projects.

## Quick Connection

```python
import sqlite3

def get_connection(db_path: str) -> sqlite3.Connection:
    conn = sqlite3.connect(db_path, check_same_thread=False)
    conn.row_factory = sqlite3.Row  # Dict-like access
    conn.execute("PRAGMA journal_mode=WAL")  # Better concurrency
    conn.execute("PRAGMA foreign_keys=ON")
    return conn
```

## Context Manager Pattern

```python
from contextlib import contextmanager

@contextmanager
def db_transaction(conn: sqlite3.Connection):
    try:
        yield conn
        conn.commit()
    except Exception:
        conn.rollback()
        raise
```

## WAL Mode

Enable for concurrent read/write:

```python
conn.execute("PRAGMA journal_mode=WAL")
```

| Mode | Reads | Writes | Best For |
|------|-------|--------|----------|
| DELETE (default) | Blocked during write | Single | Simple scripts |
| WAL | Concurrent | Single | Web apps, MCP servers |

## Common Gotchas

| Issue | Solution |
|-------|----------|
| "database is locked" | Use WAL mode |
| Slow queries | Add indexes, check EXPLAIN QUERY PLAN |
| Thread safety | Use `check_same_thread=False` |
| FK not enforced | Run `PRAGMA foreign_keys=ON` |

## CLI Quick Reference

```bash
sqlite3 mydb.sqlite    # Open database
.tables                # Show tables
.schema items          # Show schema
.headers on && .mode csv && .output data.csv  # Export CSV
VACUUM;                # Reclaim space
```

## When to Use

- Local state/config storage
- Caching layer
- Event logging
- MCP server persistence
- Small to medium datasets

## Additional Resources

For detailed patterns, load:
- `./references/schema-patterns.md` - State, cache, event, queue table designs
- `./references/async-patterns.md` - aiosqlite CRUD, batching, connection pools
- `./references/migration-patterns.md` - Version migrations, JSON handling


---
Source attribution: claude-mods
Original project: https://github.com/aiskillstore/marketplace/blob/3012aed76b16bfe12407f2d24b1cf11ac56eb7bb/skills/0xdarkmatter/sqlite-ops/SKILL.md
License: MIT
License information: https://opensource.org/license/mit
Original upstream instructions; downloaded from Mega AI Hub.

## Upstream license notice

MIT License

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.



# Mega AI Hub resource metadata

Creator / publisher: claude-mods
Original project: https://github.com/aiskillstore/marketplace/blob/3012aed76b16bfe12407f2d24b1cf11ac56eb7bb/skills/0xdarkmatter/sqlite-ops/SKILL.md
Attribution basis: Source repository record

Fields of work: Development & Engineering, Data & Analytics
Roles: Data Engineer, Backend Developer, Data Analyst
Specialties: Database, Backend
Tools: SQLite, Python
Country applicability: Country not specified
Classification basis: Source category, role and specialization labels
Instruction SHA-256: e07c21412dd49921238f5d2e2705c94f4b21f81e5d5dbaa8e523e824ca2d3dab