How Can I Log All SQL Queries in My Django Application?

Log all SQL queries in your Django app

This article will guide you on how to effectively log all SQL queries executed by your Django application, including queries from the admin site. The key is to modify the settings.py field in the LOGGING file.

Implementation steps:

1. Import logging library: First, import the logging library into your code. This allows you to configure and handle logging functionality.

<code class="language-python">import logging</code>

2. Define a custom processor (optional): You can choose to create a custom processor to process the SQL query log. This is not required, but provides more control over logging behavior.

<code class="language-python">class QueryHandler(logging.Handler):
    def emit(self, record):
        # 自定义处理SQL查询的逻辑
        pass</code>

3. Configure log settings: Merge the following code snippet into the settings.py field in the LOGGING file. This will enable SQL query logging and direct output to the defined processor.

<code class="language-python">LOGGING = {
    'version': 1,
    'filters': {
        'require_debug_true': {
            '()': 'django.utils.log.RequireDebugTrue',
        }
    },
    'handlers': {
        'console': {
            'level': 'DEBUG',
            'filters': ['require_debug_true'],
            'class': 'logging.StreamHandler',
        },
        'query_handler': {
            'level': 'DEBUG',
            'filters': [],
            'class': 'path.to.QueryHandler', # 将path.to.QueryHandler替换为您的自定义处理器的路径
        }
    },
    'loggers': {
        'django.db.backends': {
            'level': 'DEBUG',
            'handlers': ['query_handler'],
        }
    }
}</code>

4. Instantiate the logger: After configuring the settings, create a logger to start logging.

<code class="language-python">logger = logging.getLogger('django.db.backends')</code>

5. Logging SQL queries: Finally, use a logger to log SQL queries during application execution.

<code class="language-python">logger.debug(sql_query)</code>

By following these steps and incorporating the provided code snippets into your settings.py file, Django will log all SQL queries to the specified log file, providing a comprehensive overview of all database interactions. Remember to replace 'path.to.QueryHandler' with the actual path to your custom processor. If you don't need a custom processor, you can remove the 'query_handler' part and keep only the 'console' processor.

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