Dapper Database Connections: Manual or Automatic Management – Which Approach is Best?

Managing Database Connections in Dapper

Dapper offers two approaches for managing database connections:

Fully Managed by Developer:
The developer takes full responsibility for opening and closing connections, following the traditional ADO.NET approach.

Automatic Management by Dapper:
Dapper automatically opens and closes connections on the developer's behalf, similar to DataAdapter.Fill(), although this method is generally discouraged.

Performance Considerations:

• Multiple Queries on a Single Connection: Dapper allows for multiple queries to be executed on the same connection, which is more efficient than opening and closing a new connection for each query.
• Closing Connections: Closing connections (by calling Close(), Dispose(), or using a using block) releases them back to the connection pool.
• Connection Pool: Using a connection pool minimizes the overhead of creating and establishing new connections, improving performance for subsequent queries.

Recommendation:

While Dapper provides the option for automatic connection management, it's generally recommended that developers manage connections themselves at a broader granularity (e.g., per request). This approach allows for better control over resource management and avoids potential performance issues.

Implementing Unit of Work for Transactions:

To enhance data integrity, it's recommended to use a Unit of Work (UoW) to manage transactions. A UoW provides a consistent interface to begin, commit, and rollback transactions.

Code Example:

The following C# code snippet demonstrates the implementation of a UoW with Dapper:

public class MyRepository
{
    public MyRepository(IUnitOfWork unitOfWork) {...}

    public MyPoco Get() {...}

    public void Insert(MyPoco poco) {...}
}

using(DalSession dalSession = new DalSession())
{
    UnitOfWork unitOfWork = dalSession.UnitOfWork;
    unitOfWork.Begin();
    try
    {
        MyRepository myRepository = new MyRepository(unitOfWork);
        unitOfWork.Commit();
    }
    catch
    {
        unitOfWork.Rollback();
        throw;
    }
}

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