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import sqlite3
from typing import List, Tuple, Any
from adapters.db.base import DBAdapter
class SQLiteAdapter(DBAdapter):
name = "sqlite"
dialect = "sqlite"
def __init__(self, path: str):
self.path = path
def preview_schema(self, limit_per_table: int = 0) -> str:
with sqlite3.connect(self.path, uri=True) as conn:
cur = conn.cursor()
cur.execute("PRAGMA foreign_keys = ON")
tables = [t[0] for t in cur.fetchall()]
lines = []
for t in tables:
cur.execute(f"PRAGMA table_info({t});")
cols = [f"{c[1]}:{c[2]}" for c in cur.fetchall()]
lines.append(f"- {t} ({', '.join(cols)})")
return "\n".join(lines)
def execute(self, sql: str) -> Tuple[List[Tuple[Any, ...]], List[str]]:
# enforce read-only connection
uri = f"file:{self.path}?mode=ro&uri=true"
with sqlite3.connect(uri, uri=True, timeout=3) as conn:
cur = conn.cursor()
cur.execute(sql)
rows = cur.fetchall()
cols = [desc[0] for desc in cur.description]
return rows, cols
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