/// <exception cref="InvalidOperationException">Missed secondary key for some criterion.</exception>
public virtual IEnumerable <DatabaseEntry> GetByJoin(IBDbEntityInfo info, ICollection <IDataCriterion> criteria)
{
var cursorsLength = 0;
var secondaryCursors = new SecondaryCursor[criteria.Count];
JoinCursor joinCursor = null;
try {
var primaryDb = _schema.GetPrimaryDb(info.EntityName);
foreach (var criterion in criteria)
{
SecondaryKeyAttribute secondaryKey;
if (!info.SecondaryKeys.TryGetValue(criterion.Name, out secondaryKey))
{
var msg = $"Missed secondaty key '{criterion.Name}' for entity {info.EntityName} ({info.EntityType}).";
Log.TraceEvent(TraceEventType.Critical, msg);
throw new InvalidOperationException(msg);
}
var secondaryDb = _schema.GetSecondaryDb(primaryDb, secondaryKey);
var cursor = secondaryDb.SecondaryCursor();
secondaryCursors[cursorsLength++] = cursor;
var key = new DatabaseEntry(criterion.Value.ToBinnary());
if (!cursor.Move(key, exact:true))
{
yield break;
}
}
joinCursor = primaryDb.Join(secondaryCursors, true);
while (joinCursor.MoveNext())
{
yield return(joinCursor.Current.Value);
}
}
finally {
joinCursor?.Close();
for (var i = 0; i < cursorsLength; i++)
{
secondaryCursors[i].Close();
}
}
}
/// <exception cref="NotSupportedException">Can't provide id for <paramref name="entity"/>.</exception>
protected virtual DatabaseEntry KeyOf(object entity, IBDbEntityInfo info)
{
var bytesIdentified = entity as IIdentified <byte[]>;
if (bytesIdentified != null)
{
return(new DatabaseEntry(bytesIdentified.Id));
}
var guidIdentified = entity as IIdentified <Guid>;
if (guidIdentified != null)
{
return(new DatabaseEntry(guidIdentified.Id.ToByteArray()));
}
var longIdentified = entity as IIdentified <long>;
if (longIdentified != null)
{
return(new DatabaseEntry(BitConverter.GetBytes(longIdentified.Id)));
}
var intIdentified = entity as IIdentified <int>;
if (intIdentified != null)
{
return(new DatabaseEntry(BitConverter.GetBytes(intIdentified.Id)));
}
throw new NotSupportedException("By default, supported only identifying of entities that implements at least one of the following interfaces:\n" +
$"{nameof(IIdentified<byte[]>)},\n" +
$"{nameof(IIdentified<Guid>)},\n" +
$"{nameof(IIdentified<long>)},\n" +
$"{nameof(IIdentified<int>)}.\n" +
$"Please, implement at least one of these interfaces in entity '{info.EntityType.FullName}', or manually override that logic.");
}
public BDbDataGetter(IReadingRepository readingRepository, IBDbEntityInfo info) : base(readingRepository, info)
{
}
protected bool Equals(IBDbEntityInfo other)
{
return(string.Equals(EntityName, other.EntityName) && Equals(EntityType, other.EntityType) && Equals(Repository, other.Repository));
}
