Update README.md

README.md

@@ -1,9 +1,3 @@
-# install bashrc
-```shell
-ln -s $(pwd)/wiki/linux-bash/bash_aliases.sh ~/.bash_aliases
-source "$HOME/.${SHELL##*/}rc"
-```
-
 ## ThreadPoolExecutor
 ```py
 __import__('concurrent').futures.ThreadPoolExecutor().submit(
@@ -18,3 +12,36 @@ def File(blob):
       (sock := zmq.Context().socket(zmq.REQ)).connect('tcp://localhost:6106')
       sock.RCVTIMEO = 1000; File.sock = sock; return File(blob)
 ```
+
+## sqlite3
+```py
+def SQL():
+   def File(blob):
+      try: import zmq; File.sock.send_pyobj(blob); return File.sock.recv_pyobj()
+      except (AttributeError, zmq.Again):
+         (sock := zmq.Context().socket(zmq.REQ)).connect('tcp://localhost:6106')
+         sock.RCVTIMEO = 1000; File.sock = sock; return File(blob)
+
+    import sqlite3
+    (con := sqlite3.connect('.db', isolation_level=None)).row_factory = sqlite3.Row
+    con.executescript("""
+        PRAGMA journal_mode=WAL;
+        CREATE TABLE IF NOT EXISTS kv(k, v, t DEFAULT CURRENT_TIMESTAMP);
+        CREATE INDEX IF NOT EXISTS index_kv_v ON kv(v);
+        CREATE INDEX IF NOT EXISTS index_kv_k_t ON kv(k, t DESC);
+    """)
+    def setitem(sql, filename, blob):
+        assert isinstance(blob, bytes)
+        sql('INSERT INTO kv(k, v) VALUES(?,?)', filename, File(blob))
+    def getitem(sql, filename):
+        if sha1 := sql('SELECT v FROM kv WHERE k=? ORDER BY t DESC', filename):
+            return File(sha1[0]['v'])
+    def contains(sql, filename):
+        return bool(sql('SELECT 1 FROM kv WHERE k=?', filename))
+    def df(sql):
+        import pandas as pd
+        return pd.DataFrame(sql('SELECT * FROM kv'))
+    return type('', (), dict(__call__=lambda _, q, *p: list(map(dict, con.execute(q, p))),
+        __setitem__=setitem, __getitem__=getitem, __contains__=contains, df=df))()
+sql = SQL()
+```