/// <summary>
/// Gets the events by I ds.
/// </summary>
/// <param name="aggregateIDs">The aggregate I ds.</param>
/// <returns></returns>
public IEnumerable <AggregateTuple <IEnumerable <Event> > > GetEventsByIDs(IEnumerable <AggregateTuple <int> > aggregateIDs)
{
var xml = new XElement("r", aggregateIDs
.Select(x => new XElement("i",
new XAttribute("i", x.AggregateID),
new XAttribute("s", x.Item1)))
);
using (var connection = new SqlConnection(_connectionString))
{
var sql = string.Format(@"
Select AggregateId, Type, Blob
From dbo.[{0}]
Inner Join @xml.nodes(N'/r/i') _xml(item)
On (AggregateID = _xml.item.value(N'@i', N'nvarchar(100)'))
And (EventSequence > _xml.item.value(N'@s', N'int'))
Order By AggregateID, EventSequence;", _tableName);
var command = new SqlCommand(sql, connection)
{
CommandType = CommandType.Text
};
command.Parameters.AddRange(new[] {
new SqlParameter {
ParameterName = "@xml", SqlDbType = SqlDbType.Xml, Value = xml.ToString()
}
});
connection.Open();
var events = new List <AggregateTuple <IEnumerable <Event> > >();
using (var r = command.ExecuteReader())
{
var eventGroup = new List <Event>();
string lastAggregateID = null;
var ordinal = new EventOrdinal(r, true);
while (r.Read())
{
var aggregateID = r.Field <string>(ordinal.AggregateID);
if (lastAggregateID != aggregateID)
{
events.Add(new AggregateTuple <IEnumerable <Event> >
{
AggregateID = lastAggregateID,
Item1 = eventGroup,
});
lastAggregateID = aggregateID;
eventGroup = new List <Event>();
}
eventGroup.Add(MakeEvent(r, ordinal));
}
if (eventGroup.Count > 0)
{
events.Add(new AggregateTuple <IEnumerable <Event> >
{
AggregateID = lastAggregateID,
Item1 = eventGroup,
});
}
}
return(events);
}
}
private Event MakeEvent(SqlDataReader r, EventOrdinal ordinal)
{
var type = TypeMapTo(r.Field <string>(ordinal.Type));
var blob = r.Field <string>(ordinal.Blob);
return(type != null ? _serializer.ReadObject <Event>(type, blob) : null);
}
/// <summary>
/// Gets the events by ID.
/// </summary>
/// <param name="aggregateID">The aggregate ID.</param>
/// <param name="startSequence">The start sequence.</param>
/// <returns></returns>
public IEnumerable <Event> GetEventsByID(object aggregateID, int startSequence)
{
using (var connection = new SqlConnection(_connectionString))
{
var sql = string.Format(@"
Select Type, Blob
From dbo.[{0}]
Where (AggregateID = @id)
And (EventSequence > @sequence)
Order By EventSequence;", _tableName);
var command = new SqlCommand(sql, connection)
{
CommandType = CommandType.Text
};
command.Parameters.AddRange(new[] {
new SqlParameter {
ParameterName = "@id", SqlDbType = SqlDbType.NVarChar, Value = aggregateID
},
new SqlParameter {
ParameterName = "@sequence", SqlDbType = SqlDbType.Int, Value = startSequence
}
});
connection.Open();
using (var r = command.ExecuteReader())
{
var ordinal = new EventOrdinal(r, false);
while (r.Read())
{
yield return(MakeEvent(r, ordinal));
}
}
}
}
