How to Handle \'Data Truncated\' Warnings During MySQL Queries in Python?

Handling MySQL Warnings in Python

Question:

In a Python script, how do you capture warnings of the form "Data truncated for column 'xxx'" during MySQL queries?

Specific code snippets are given in the original question, but they fail to trap the warnings.

Answer:

MySQL warnings are not raised as exceptions. Instead, they are reported to stderr. To handle them, you need to use the Python warnings module.

To configure the handling of warnings, use the warnings.filterwarnings function. For instance, to turn MySQLdb warning into exceptions:

<code class="python">import warnings
warnings.filterwarnings('error', category=MySQLdb.Warning)</code>

Alternatively, you can use 'ignore' to suppress the warnings entirely.

You can also set more granular filters based on specific criteria. For example, the following code ignores all warnings except those related to truncation:

<code class="python">warnings.filterwarnings('ignore', category=MySQLdb.Warning)
warnings.filterwarnings('error', category=MySQLdb.Warning, message='Data truncated')</code>

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