Example showing prepared statements with pg8000 (#821)

Example showing prepared statements with pg8000

Author: hlcianfagna

by-language/python-pg8000/README.rst

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+.. highlight: console
+
+#################################################
+Connect to CrateDB and CrateDB Cloud using pg8000
+#################################################
+
+
+*****
+About
+*****
+
+Example programs demonstrating CrateDB with pg8000,
+for the PostgreSQL protocol.
+
+
+*****
+Setup
+*****
+
+To start a CrateDB instance on your machine for evaluation purposes, invoke::
+
+    docker run --publish 4200:4200 --publish 5432:5432 --env CRATE_HEAP_SIZE=1g crate:latest -Cdiscovery.type=single-node
+
+Navigate to the example program directory, and install prerequisites::
+
+    # Acquire sources.
+    git clone https://github.com/crate/cratedb-examples
+    cd cratedb-examples
+    python3 -m venv .venv
+    source .venv/bin/activate
+    pip install pg8000
+
+
+********
+Examples
+********
+
+Run an example program::
+
+    python basic.py
+

by-language/python-pg8000/basic.py

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+import ssl
+
+import pg8000
+
+# When connecting to CrateDB Cloud you may want to use SSL
+# ssl_context = ssl.create_default_context()
+
+conn = pg8000.connect(
+    user="crate",
+    password="",
+    host="localhost",
+    port=5432,
+    database="doc",
+    # ssl_context=ssl_context,
+)
+
+query = """
+    SELECT mountain,height
+    FROM sys.summits
+    WHERE height >= :minimum_height
+    ORDER BY height DESC
+    LIMIT :number_of_rows;
+"""
+
+ps = conn.prepare(query)
+ps.run(minimum_height=4000, number_of_rows=10)