Update sqlite3-python/README.md

sqlite3-python/README.md

@@ -9,6 +9,24 @@ sql("SELECT * FROM sqlite_master WHERE type = 'table'")
 ```
 
 # Dict-like
+```python
+def SQL():
+    from sqlite3 import connect, Row
+    (con := connect('.db.sql', isolation_level=None)).row_factory = Row
+    sql = type('', (), dict(
+        __call__=lambda _, q, *p: list(map(dict, con.execute(q, p))),
+        __iter__=lambda sql: (kv.values() for kv in sql('SELECT * FROM kv')),
+        __getitem__=lambda sql, k: sql('SELECT v FROM kv WHERE k=?', k)[0]['v'],
+        __setitem__=lambda sql, k, v: 
+            sql('INSERT or REPLACE INTO kv VALUES(?,?)', k, v),
+    ))()
+    sql('PRAGMA journal_mode=wal')
+    sql('PRAGMA busy_timeout='f'{1e9}')
+    sql('CREATE TABLE IF NOT EXISTS kv(k PRIMARY KEY, v)')
+    return sql
+sql = SQL()
+```
+
 ```python
 def Dict(db='dict.db', *, sqlite3=__import__('sqlite3')):
     sql = sqlite3.connect(db, isolation_level=None, timeout=1e999).execute