Скачать или смотреть How to Conditionally Skip a Doctrine Migration Statement and Insert id = 0 Records Safely

Learn how to conditionally insert a default record with id=0 in Doctrine migrations and avoid common SQL mode pitfalls using NO_AUTO_VALUE_ON_ZERO.
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This video is based on the question https://stackoverflow.com/q/79504179/ asked by the user 'kekaaafm' ( https://stackoverflow.com/u/29964795/ ) and on the answer https://stackoverflow.com/a/79505787/ provided by the user 'kekaaafm' ( https://stackoverflow.com/u/29964795/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Problem Overview

You want to deploy a feature rollout that requires setting a default meal moment (meal_moment with id = 0) for clients without existing data. Additionally, you need to update all orders to reference this default by setting their mealmoment_id to 0. However, some clients already have this data, and running the migration blindly can cause crashes or unwanted data overriding.

Challenges

The insert statement always changes id = 0 to id = 1, due to MySQL's default auto-increment sql_mode behavior.

The migration crashes in some environments where the meal_moment row with id=0 already exists.

Need to conditionally run SQL inside the migration based on existing data.



Solution Explained

1. Check for Existing Data Using Doctrine's Connection

Instead of blindly running inserts, query the database first to verify if a meal_moment with id = 0 exists. This avoids duplicate inserts and errors.

Use Doctrine's database connection to prepare and execute a simple count query:

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Continue only if $count == 0.

2. Handle MySQL SQL Mode to Allow Explicit id = 0 Insert

MySQL by default ignores explicit inserts of 0 in auto-increment columns and replaces it with the next incremental value (usually 1). To override this behavior, enable the NO_AUTO_VALUE_ON_ZERO mode temporarily during the insert.

Steps:

Retrieve current SQL modes to restore them later.

Set SQL mode to include NO_AUTO_VALUE_ON_ZERO.

Insert the row with id = 0.

Reset SQL modes to the original state.

Example:

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3. Update Orders After Conditional Insert

Regardless of whether the insert happened, ensure orders without a mealmoment_id are updated:

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4. Clean Down Migration

Reverse the changes by setting mealmoment_id back to NULL for those with 0 and deleting the default meal_moment record.

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Complete Migration Example

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Takeaways

Use conditional logic to avoid inserting duplicate records in migrations.

Temporarily adjusting SQL modes enables explicit inserts on auto-increment IDs.

Leveraging Doctrine's connection API helps run raw SQL safely.

This method ensures safe and idempotent migrations when working with default records and reserved IDs.