Add example

examples/pod-lispyclouds-sqlite/README.md

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+# pod-lispyclouds-sqlite
+
+To run this:
+
+- Install python3 and sqlite3
+- Create a virtualenv: `python3 -m venv ~/.virtualenvs/babashka`
+- Switch to it: `source ~/.virtualenvs/babashka/bin/activate`
+- Run: `pip install bcoding` to install the bencode lib
+- Create a new db: `sqlite3 /tmp/babashka.db "create table foo (foo int);"`
+
+Then run as pod:
+
+``` clojure
+(babashka.pods/load-pod ["./pod-lispyclouds-sqlite.py"])
+(require '[pod.lispyclouds.sqlite :as sqlite])
+(sqlite/execute! "create table if not exists foo ( int foo )")
+(sqlite/execute! "delete from foo")
+(sqlite/execute! "insert into foo values (1), (2)")
+(sqlite/execute! "select * from foo") ;;=> ([1] [2])
+```

examples/pod-lispyclouds-sqlite/pod-lispyclouds-sqlite.py

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+#!/usr/bin/env python3
+
+import json
+import sqlite3
+import sys
+
+from bcoding import bencode, bdecode
+
+
+def read():
+    return dict(bdecode(sys.stdin.buffer))
+
+
+def write(obj):
+    sys.stdout.buffer.write(bencode(obj))
+    sys.stdout.flush()
+
+def debug(*msg):
+    with open("/tmp/debug.log", "a") as f:
+        f.write(str(msg) + "\n")
+
+def main():
+    while True:
+        msg = read()
+        debug("msg", msg)
+
+        op = msg["op"]
+
+        if op == "describe":
+            write(
+                {
+                    "format": "json",
+                    "namespaces": [{"name": "pod.lispyclouds.sqlite",
+                                    "vars": [{"name": "execute!"}]}]}
+            )
+        elif op == "invoke":
+            var = msg["var"]
+            id = msg["id"]
+            args = json.loads(msg["args"])
+            debug(args)
+            conn = sqlite3.connect("/tmp/babashka.db")
+            c = conn.cursor()
+
+            result = None
+
+            if var == "pod.lispyclouds.sqlite/execute!":
+                try:
+                    result = c.execute(*args)
+                except Exception as e:
+                    debug(e)
+
+            value = json.dumps(result.fetchall())
+            debug("value", value)
+
+            write({"value": value, "id": id, "status": ["done"]})
+
+            conn.commit()
+            conn.close()
+
+if __name__ == "__main__":
+    main()