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TypeORM is a powerful Object-Relational Mapper (ORM) for TypeScript and JavaScript. It allows developers to interact with databases using object-oriented programming principles, making it easier to manage database schemas and perform CRUD operations. TypeORM supports various databases like MySQL, PostgreSQL, SQLite, and more, providing a unified API for database interactions.
When working with TypeORM, you might encounter the OptimisticLockVersionMismatchError
. This error typically occurs when you attempt to update an entity, but the version of the entity in the database does not match the expected version. This mismatch can lead to failed updates and data inconsistencies.
During an update operation, you might see an error message similar to:
Error: OptimisticLockVersionMismatchError: The entity has a version that does not match the expected version.
The OptimisticLockVersionMismatchError
is a mechanism used by TypeORM to prevent concurrent updates from overwriting each other. When using optimistic locking, each entity has a version column that increments with each update. If the version in the database does not match the version in the update request, TypeORM throws this error to indicate a potential conflict.
This error occurs when:
To resolve this issue, you can take several approaches:
Implement a retry mechanism to attempt the update again. This can be useful in scenarios where transient conflicts occur.
async function updateEntityWithRetry(entity, retries = 3) {
for (let attempt = 0; attempt < retries; attempt++) {
try {
await repository.save(entity);
return;
} catch (error) {
if (error.name !== 'OptimisticLockVersionMismatchError') throw error;
}
}
throw new Error('Failed to update entity after multiple attempts');
}
If retrying is not suitable, inform the user about the conflict and provide options to resolve it, such as reloading the entity or discarding changes.
Implement a custom strategy to merge changes or decide which version to keep. This requires a deeper understanding of the business logic and data consistency requirements.
For more information on handling optimistic locking in TypeORM, refer to the official documentation. You can also explore TypeORM's GitHub issues for community discussions and solutions.
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