Databases
Node.js Database Transactions
Handling Transactions
Node.js database transactions ensure data integrity with commit/rollback.
Introduction to Database Transactions
Database transactions in Node.js are crucial for maintaining data integrity, especially in applications that require multiple operations to be executed as a single unit. Transactions allow you to ensure that either all operations within a transaction are completed successfully or none at all. This is achieved through the use of commit and rollback operations.
Understanding Commit and Rollback
A transaction begins with a series of operations that are treated as a single logical unit. During this transaction, changes are made temporarily. If all operations succeed, a commit is performed, making the changes permanent. If any operation fails, a rollback is executed, reverting the database to its previous state.
Using Transactions in Node.js with MySQL
To demonstrate how transactions work in Node.js, we will use the mysql package. This example will show how to implement a transaction that transfers money between two accounts.
Handling Transactions with PostgreSQL
For PostgreSQL, the pg library is a popular choice. Here is how you can handle transactions using this library.
Best Practices for Using Transactions
When working with transactions in Node.js, consider these best practices:
- Keep transactions short: Long transactions can lock database resources, affecting performance.
- Handle errors properly: Always ensure rollbacks are in place to maintain data integrity.
- Test thoroughly: Ensure all transaction scenarios (success, failure, partial) are tested.
Databases
- MongoDB
- MySQL
- PostgreSQL
- Redis
- Database Connection
- ORM
- Mongoose
- Sequelize
- TypeORM
- Database Transactions
