How Should I Manage Database Connections When Using Dapper?

Handling Open and Closing Connections with Dapper

When using Dapper, it's crucial to understand how to manage database connections. There are two approaches:

1. Full Self-Management:

In this scenario, you take complete ownership of opening and closing the connection. This approach mirrors how connections are handled in standard ADO.NET.

2. Dapper-Managed Connections:

Dapper handles connection management automatically. It opens the connection (if necessary) and closes it (if it opened it) after each query execution. This approach is akin to using DataAdapter.Fill() in ADO.NET.

Connection Opening and Closing Guidelines:

Assuming you're using the latest version of Dapper, the following guidelines apply:

• For quick one-time queries, allow Dapper to handle the connection automatically.
• For multiple queries within a specific scope (e.g., a request), it's more efficient to open and close the connection once outside Dapper's control.

Closing Connections and Resource Management:

Regardless of the connection management approach, it's essential to close connections (via Close(), Dispose(), or a using block) to avoid resource leaks. Closing a connection returns it to the connection pool, which enhances performance by saving the cost of creating new connections.

Implementing Unit of Work with Dapper:

Beyond connection handling, consider implementing a Unit of Work (UoW) pattern to manage transactions. This technique provides a centralized control of database operations, ensuring data integrity.

Example Implementation:

The provided code illustrates how to implement a DalSession class for connection handling and a UnitOfWork class for transaction management. Repositories utilize dependency injection to access the UnitOfWork. This approach offers a flexible and controlled way to manage database connections and transactions.

Conclusion:

By following these guidelines, you can optimize your Dapper code for efficient and reliable database interactions. Effective connection management and transaction handling are key aspects of any database application, and these techniques empower you to handle these aspects effectively.

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