How Does Dapper Handle Database Connections, and What are the Best Practices for Connection Management?

Connection Management with Dapper

When executing queries with Dapper, managing the connection is critical to ensure resource efficiency and prevent memory leaks. This article discusses the two approaches to connection management and explores the benefits of connection reuse in enhancing SQL performance.

Fully Managing Connections

In this approach, you have complete control over opening and closing the connection, similar to ADO.NET. Once a query is executed, you must explicitly call the Close method or enclose the connection within a Using statement to return it to the pool and avoid resource leaks.

Letting Dapper Manage Connections

Dapper can automatically handle connection management, opening connections if needed and closing them afterward. This simplifies your code but may not be suitable in all scenarios, particularly when opening and closing connections at a larger granularity (e.g., per request).

Benefits of Connection Reuse

Connection reuse through connection pools significantly improves performance by eliminating the cost of creating new connections for each query. Closing connections and returning them to the pool ensures they are available for future queries. This optimization can lead to noticeable performance gains, especially when executing multiple queries within a short period.

Closing Connections

To avoid memory leaks and potential performance issues, it is essential to close connections that are no longer needed. This can be achieved through either the Close method or the Using statement. By actively returning connections to the pool, you ensure they can be reused and contribute to performance enhancement.

Implementation Recommendations

Implement a UnitOfWork to manage transactions alongside connection handling. This approach provides a centralized location to control connection management and transaction behavior. Additionally, consider using repository patterns to encapsulate database operations and reduce direct exposure of database connections in your calling code.

Conclusion

Properly managing connections when using Dapper is crucial to ensure resource efficiency and maximize performance. By understanding the available connection management options and implementing best practices such as connection pooling and reuse, you can optimize your code and enhance the overall performance of your SQL operations.

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