IDbConnection工厂使用Dapper

Question

I using dapper in my ASP.NET WebForms solution.

All my classes which handles data retrieves an open connection from this base class

public abstract class SalesDb : IDisposable
{
    protected static IDbConnection OpenConnection()
    {
        IDbConnection connection = new SqlConnection(ConfigurationManager.ConnectionStrings["SalesDb"].ConnectionString);
        connection.Open();
        return connection;
    }

    public void Dispose()
    {
        OpenConnection().Dispose();
    }
}

Example of a service class that uses this base class

public class LeadService : SalesDb
{
    public IEnumerable<LeadDto> Select()
    {
        using (IDbConnection connection = OpenConnection())
        {
            return connection.Query<LeadDto>("Lead_Select",
                null, null, true, null, CommandType.StoredProcedure);
        }
    }
}

Is there any disadvantage that OpenConnection( ) method in the base class is static and return a new instance for every call?

Answer 1

You are creating a new connection in dispose? That won't work! Use a simple loop with more than 100 iterations( max pool size default is 100 ) and you'll probably see some kind of exceptions( too many open connections , ExecuteReader requires an open and available Connection etc.).

In any case i expect serious performance problems since the pool needs to create new physical connections consecutively.

I would not reinvent the Connection-Pool . My advice is: don't use that class, all the more in asp.net.

Don't poach on the Connection-Pool's territory ;-)

But note that both of your questions can be answered with No . The static method is not a problem(unlike a static connection) and also not that it always returns a new connection(since the pool would return connections that are currently not in use). But the main problem of your class is the dispose which creates connections and opens them.