Create your own IDbCommand which would wrap your real IDbCommand and log what you want to intercept.
But since Dapper creates the IDbCommand automatically, you also have to create your own IDbConnection (see CreateCommand
below) which would wrap your real IDbConnection and in case would use your own IDbCommand.
Example:
/// <summary>
/// This is just a wrapper around IDbConnection,
/// which allows us to build a wrapped IDbCommand for logging/debugging
/// </summary>
public class InterceptedDbConnection : IDbConnection
{
private readonly IDbConnection _conn;
public InterceptedDbConnection(IDbConnection connection)
{
_conn = connection;
}
public string ConnectionString { get => _conn.ConnectionString; set => _conn.ConnectionString = value; }
public int ConnectionTimeout => _conn.ConnectionTimeout;
public string Database => _conn.Database;
public ConnectionState State => _conn.State;
public IDbTransaction BeginTransaction() => _conn.BeginTransaction();
public IDbTransaction BeginTransaction(IsolationLevel il) => _conn.BeginTransaction(il);
public void ChangeDatabase(string databaseName) => _conn.ChangeDatabase(databaseName);
public void Close() => _conn.Close();
public IDbCommand CreateCommand()
{
// Wrap real command under InterceptedDbCommand
IDbCommand underlyingCommand = _conn.CreateCommand();
return new InterceptedDbCommand(underlyingCommand);
// you could also save this into a "LastCommand" to expose it
// and explore parameter types that Dapper used
}
public void Dispose() => _conn.Dispose();
public void Open() => _conn.Open();
}
/// <summary>
/// This is just a wrapper around IDbCommand,
/// which allows us to log queries
/// or inspect how Dapper is passing our Parameters
/// </summary>
public class InterceptedDbCommand : IDbCommand
{
private readonly IDbCommand _cmd;
public InterceptedDbCommand(IDbCommand command)
{
_cmd = command;
}
public string CommandText { get => _cmd.CommandText; set => _cmd.CommandText = value; }
public int CommandTimeout { get => _cmd.CommandTimeout; set => _cmd.CommandTimeout = value; }
public CommandType CommandType { get => _cmd.CommandType; set => _cmd.CommandType = value; }
public IDbConnection Connection { get => _cmd.Connection; set => _cmd.Connection = value; }
public IDataParameterCollection Parameters => _cmd.Parameters;
public IDbTransaction Transaction { get => _cmd.Transaction; set => _cmd.Transaction = value; }
public UpdateRowSource UpdatedRowSource { get => _cmd.UpdatedRowSource; set => _cmd.UpdatedRowSource = value; }
public void Cancel() => _cmd.Cancel();
public IDbDataParameter CreateParameter() => _cmd.CreateParameter();
public void Dispose() => _cmd.Dispose();
public void Prepare() => _cmd.Prepare();
public int ExecuteNonQuery()
{
// TODO: Log _cmd.CommandText + _cmd.Parameters
return _cmd.ExecuteNonQuery();
}
public IDataReader ExecuteReader()
{
// TODO: Log _cmd.CommandText + _cmd.Parameters
return _cmd.ExecuteReader();
}
public IDataReader ExecuteReader(CommandBehavior behavior)
{
// TODO: Log _cmd.CommandText + _cmd.Parameters
return _cmd.ExecuteReader(behavior);
}
public object ExecuteScalar()
{
// TODO: Log _cmd.CommandText + _cmd.Parameters
return _cmd.ExecuteScalar();
}
}
Last, just replace your connection by the wrapped one:
IDbConnection databaseConnection = new InterceptedDbConnection(MySqlConnection("connectionString"));