Add sqlcommenter example to docs

CHANGELOG.md

@@ -32,6 +32,8 @@ inject a `requests.Session` or `grpc.ChannelCredentials` object into OTLP export
   ([#4735](https://github.com/open-telemetry/opentelemetry-python/pull/4735))
 - opentelemetry-sdk: fix calling Logger.emit with an API LogRecord instance
   ([#4741](https://github.com/open-telemetry/opentelemetry-python/pull/4741))
+- docs: Added sqlcommenter example
+  ([#4734](https://github.com/open-telemetry/opentelemetry-python/pull/4734))
 
 ## Version 1.36.0/0.57b0 (2025-07-29)
 

docs/examples/sqlcommenter/README.rst

@@ -0,0 +1,124 @@
+sqlcommenter
+============
+
+This is an example of how to use OpenTelemetry Python instrumention with
+sqlcommenter to enrich database query statements with contextual information.
+For more information on sqlcommenter concepts, see:
+
+* `Semantic Conventions - Database Spans <https://github.com/open-telemetry/semantic-conventions/blob/main/docs/database/database-spans.md#sql-commenter>`_
+* `sqlcommenter <https://google.github.io/sqlcommenter/>`_
+
+The source files of this example are available `here <https://github.com/open-telemetry/opentelemetry-python/tree/main/docs/examples/sqlcommenter/>`_.
+This example uses Docker to manage a database server and OpenTelemetry collector.
+
+Run MySQL server
+----------------
+
+A running MySQL server with general logs enabled will store query statements with context resulting from the sqlcommenter feature enabled in this example.
+
+.. code-block:: sh
+
+    cd books_database
+    docker build -t books-db .
+    docker run -d --name books-db -p 3366:3306 books-db
+    cd ..
+
+Check that the run is working and the general log is available:
+
+.. code-block:: sh
+
+    docker exec -it books-db tail -f /var/log/general.log
+
+Run OpenTelemetry Collector
+---------------------------
+
+Running the OpenTelemetry collector will show the MySQL instrumentor's
+comment-in-span-attribute feature, which this example has also enabled.
+
+.. code-block:: sh
+
+    docker run \
+        -p 4317:4317 \
+        -v $(pwd)/collector-config.yaml:/etc/otel/config.yaml \
+        otel/opentelemetry-collector-contrib:latest
+
+Run the sqlcommenter example
+----------------------------
+
+Set up and activate a Python virtual environment. Install these
+dependencies of the sqlcommenter example:
+
+.. code-block:: sh
+
+    pip install opentelemetry-sdk \
+        opentelemetry-exporter-otlp-proto-grpc \
+        opentelemetry-instrumentation-mysql \
+        mysql-connector-python
+
+Then, run this script, which instruments all mysql-connector calls with
+two sqlcommenter features opted in.
+
+.. code-block:: sh
+
+    python instrumented_query.py
+
+Note that OpenTelemetry instrumentation with sqlcommenter is also
+available for other Python database client drivers/object relation
+mappers (ORMs). See full list at `instrumentation`_.
+
+.. _instrumentation: https://github.com/open-telemetry/opentelemetry-python-contrib/tree/main/instrumentation
+
+Check MySQL server general log and spans for sqlcomment
+-------------------------------------------------------
+
+After running the query script, check the MySQL general log contents:
+
+.. code-block:: sh
+
+    docker exec -it books-db tail -f /var/log/general.log
+
+For each instrumented ``SELECT`` call, a query was made and logged with
+a sqlcomment appended. For example:
+
+.. code::
+
+    2025-09-02T18:49:06.981980Z	  186 Query	SELECT * FROM authors WHERE id = 1 /*db_driver='mysql.connector%%3A9.4.0',dbapi_level='2.0',dbapi_threadsafety=1,driver_paramstyle='pyformat',mysql_client_version='9.4.0',traceparent='00-2c45248f2beefdd9688b0a94eb4ac9ee-4f3af9a825aae9b1-01'*/
+
+In the running OpenTelemetry collector, you'll also see one span per
+``SELECT`` call. Each of those span's trace ID and span ID will
+correspond to a query log sqlcomment. With the comment-in-attribute
+feature enabled, the span's ``db.statement`` attribute will also contain
+the sqlcomment. For example:
+
+.. code::
+
+    ScopeSpans #0
+    ScopeSpans SchemaURL: https://opentelemetry.io/schemas/1.11.0
+    InstrumentationScope opentelemetry.instrumentation.mysql 0.57b0
+    Span #0
+        Trace ID       : 2c45248f2beefdd9688b0a94eb4ac9ee
+        Parent ID      :
+        ID             : 4f3af9a825aae9b1
+        Name           : SELECT
+        Kind           : Client
+        Start time     : 2025-09-02 18:49:06.982341 +0000 UTC
+        End time       : 2025-09-02 18:49:06.98463 +0000 UTC
+        Status code    : Unset
+        Status message :
+    Attributes:
+        -> db.system: Str(mysql)
+        -> db.name: Str(books)
+        -> db.statement: Str(SELECT * FROM authors WHERE id = %s /*db_driver='mysql.connector%%3A9.4.0',dbapi_level='2.0',dbapi_threadsafety=1,driver_paramstyle='pyformat',mysql_client_version='9.4.0',traceparent='00-2c45248f2beefdd9688b0a94eb4ac9ee-4f3af9a825aae9b1-01'*/)
+        -> db.user: Str(books)
+        -> net.peer.name: Str(localhost)
+        -> net.peer.port: Int(3366)
+
+
+References
+----------
+
+* `OpenTelemetry Project <https://opentelemetry.io/>`_
+* `OpenTelemetry Collector <https://github.com/open-telemetry/opentelemetry-collector>`_
+* `OpenTelemetry MySQL instrumentation <https://github.com/open-telemetry/opentelemetry-python-contrib/tree/main/instrumentation/opentelemetry-instrumentation-mysql>`_
+* `Semantic Conventions - Database Spans <https://github.com/open-telemetry/semantic-conventions/blob/main/docs/database/database-spans.md#sql-commenter>`_
+* `sqlcommenter <https://google.github.io/sqlcommenter/>`_

docs/examples/sqlcommenter/books_database/Dockerfile

@@ -0,0 +1,23 @@
+FROM mysql:8.0
+
+ENV MYSQL_ROOT_PASSWORD=root
+ENV MYSQL_DATABASE=books
+
+ADD books.sql /docker-entrypoint-initdb.d/
+
+RUN echo "CREATE USER IF NOT EXISTS 'books'@'%' IDENTIFIED WITH mysql_native_password BY 'books123';" > /docker-entrypoint-initdb.d/01-create-user.sql && \
+    echo "GRANT ALL PRIVILEGES ON books.* TO 'books'@'%';" >> /docker-entrypoint-initdb.d/01-create-user.sql && \
+    echo "FLUSH PRIVILEGES;" >> /docker-entrypoint-initdb.d/01-create-user.sql
+
+# Prepare general logs
+RUN mkdir -p /var/log && \
+    touch /var/log/general.log && \
+    chown mysql:mysql /var/log/general.log
+
+EXPOSE 3306
+
+HEALTHCHECK --interval=30s --timeout=5s --start-period=5s --retries=3 \
+    CMD mysqladmin ping -p${MYSQL_ROOT_PASSWORD} || exit 1
+
+# Start MySQL with general logging enabled and compatible authentication
+CMD ["mysqld", "--general-log=1", "--general-log-file=/var/log/general.log"]

docs/examples/sqlcommenter/books_database/books.sql

@@ -0,0 +1,72 @@
+-- MySQL dump for Books Database
+-- Database: books_db
+-- Generated on: 2025-08-29
+
+SET SQL_MODE = "NO_AUTO_VALUE_ON_ZERO";
+START TRANSACTION;
+SET time_zone = "+00:00";
+
+-- Database: `books`
+CREATE DATABASE IF NOT EXISTS `books` DEFAULT CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;
+USE `books`;
+
+-- --------------------------------------------------------
+
+-- Table structure for table `authors`
+
+DROP TABLE IF EXISTS `authors`;
+CREATE TABLE `authors` (
+  `id` int(11) NOT NULL AUTO_INCREMENT,
+  `name` varchar(255) NOT NULL,
+  `home_town` varchar(255) DEFAULT NULL,
+  `birthdate` date DEFAULT NULL,
+  PRIMARY KEY (`id`)
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
+
+-- Dumping data for table `authors`
+
+INSERT INTO `authors` (`id`, `name`, `home_town`, `birthdate`) VALUES
+(1, 'Frank Herbert', 'Tacoma, Washington', '1920-10-08'),
+(2, 'Isaac Asimov', 'Petrovichi, Russia', '1920-01-02'),
+(3, 'Terry Pratchett', 'Beaconsfield, England', '1948-04-28');
+
+-- --------------------------------------------------------
+
+-- Table structure for table `books`
+
+DROP TABLE IF EXISTS `books`;
+CREATE TABLE `books` (
+  `id` int(11) NOT NULL AUTO_INCREMENT,
+  `title` varchar(255) NOT NULL,
+  `author_id` int(11) NOT NULL,
+  `year_published` int(4) DEFAULT NULL,
+  `genre` varchar(100) DEFAULT NULL,
+  PRIMARY KEY (`id`),
+  KEY `fk_author` (`author_id`),
+  CONSTRAINT `fk_author` FOREIGN KEY (`author_id`) REFERENCES `authors` (`id`) ON DELETE CASCADE ON UPDATE CASCADE
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci;
+
+-- Dumping data for table `books`
+
+INSERT INTO `books` (`id`, `title`, `author_id`, `year_published`, `genre`) VALUES
+(1, 'Dune', 1, 1965, 'Science Fiction'),
+(2, 'Foundation', 2, 1951, 'Science Fiction'),
+(3, 'The Colour of Magic', 3, 1983, 'Fantasy Comedy');
+
+-- --------------------------------------------------------
+
+-- Additional books to show the many-to-one relationship
+
+INSERT INTO `books` (`id`, `title`, `author_id`, `year_published`, `genre`) VALUES
+(4, 'Dune Messiah', 1, 1969, 'Science Fiction'),
+(5, 'I, Robot', 2, 1950, 'Science Fiction'),
+(6, 'Good Omens', 3, 1990, 'Fantasy Comedy');
+
+-- --------------------------------------------------------
+
+-- Auto increment values
+
+ALTER TABLE `authors` AUTO_INCREMENT = 4;
+ALTER TABLE `books` AUTO_INCREMENT = 7;
+
+COMMIT;

docs/examples/sqlcommenter/collector-config.yaml

@@ -0,0 +1,19 @@
+receivers:
+  otlp:
+    protocols:
+      grpc:
+        endpoint: 0.0.0.0:4317
+
+exporters:
+  debug:
+    verbosity: detailed
+
+processors:
+  batch:
+
+service:
+  pipelines:
+    traces:
+      receivers: [otlp]
+      processors: [batch]
+      exporters: [debug]

docs/examples/sqlcommenter/instrumented_query.py

@@ -0,0 +1,65 @@
+# Copyright The OpenTelemetry Authors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from mysql.connector import connect
+
+from opentelemetry import trace
+from opentelemetry.exporter.otlp.proto.grpc.trace_exporter import (
+    OTLPSpanExporter,
+)
+from opentelemetry.instrumentation.mysql import MySQLInstrumentor
+from opentelemetry.sdk.resources import Resource
+from opentelemetry.sdk.trace import TracerProvider
+from opentelemetry.sdk.trace.export import BatchSpanProcessor
+
+resource = Resource.create(
+    attributes={
+        "service.name": "sqlcommenter-example",
+    }
+)
+trace.set_tracer_provider(TracerProvider(resource=resource))
+span_processor = BatchSpanProcessor(
+    OTLPSpanExporter(endpoint="http://localhost:4317")
+)
+trace.get_tracer_provider().add_span_processor(span_processor)
+
+cnx = connect(
+    host="localhost",
+    port=3366,
+    user="books",
+    password="books123",
+    database="books",
+)
+
+# Instruments MySQL queries with sqlcommenter enabled
+# and comment-in-span-attribute enabled.
+# Returns wrapped connection to generate traces.
+cnx = MySQLInstrumentor().instrument_connection(
+    connection=cnx,
+    enable_commenter=True,
+    enable_attribute_commenter=True,
+)
+
+cursor = cnx.cursor()
+statement = "SELECT * FROM authors WHERE id = %s"
+
+# Each SELECT query generates one mysql log with sqlcomment
+# and one OTel span with `db.statement` attribute that also
+# includes sqlcomment.
+for cid in range(1, 4):
+    cursor.execute(statement, (cid,))
+    rows = cursor.fetchall()
+    print(f"Found author: {rows[0]}")
+
+print("Done.")