/// <summary> /// Checks, is property of entity represents it's primary key. /// </summary> protected abstract bool IsPrimaryKey([NotNull] string propertyName, [NotNull] IAdoEntityInfo mainEntityInfo, [CanBeNull] Includeon includeon);
/// <summary>
/// Checks, is property represend foreign key to main entity from the included.
/// </summary>
protected virtual bool IsKeyOfMainEntityInForeign([NotNull] string propertyName, [NotNull] IAdoEntityInfo mainEntityInfo, [NotNull] Includeon includeon)
{
return(propertyName == includeon.ForeignKeyFromCurrentEntityToMain);
}
/// <summary>
/// Returns one single entity, by reading it's data from <paramref name="reader"/>.
/// It uses <paramref name="includeon"/> if it was specified, otherwise - it uses <paramref name="mainEntityInfo"/>.
/// It also return identifier of entity in <paramref name="keyId"/> outer parameter.
/// </summary>
/// <param name="reader">Reader contained entities data.</param>
/// <param name="mainEntityInfo">Info about entity. Used if <paramref name="includeon"/> is not specified (equals to null).</param>
/// <param name="includeon">Info about includeon. Can be unspecified. See <see cref="IncludeChildrenAttribute"/> for more details.</param>
/// <param name="keyId">
/// Identifier of returned entity.
/// If <paramref name="includeon"/> parameter unspecified, or represents single field includeon - <paramref name="keyId"/> will contain primary key of returned entity.
/// If <paramref name="includeon"/> specified and represents sum-collection of main entity (<see cref="IIncludeon.IsCollection"/>)
/// - <paramref name="keyId"/> will contain key primary key of main entity (not the key of returned one).
/// </param>
/// <returns>Main entity (when <paramref name="includeon"/> unspecified) or entity described by <paramref name="includeon"/>.</returns>
protected virtual object ReadItem(DbDataReader reader, IAdoEntityInfo mainEntityInfo, [CanBeNull] Includeon includeon, out object keyId)
{
var entityType = includeon?.Info.EntityType ?? mainEntityInfo.EntityType;
var item = Activator.CreateInstance(entityType);
keyId = null;
var isKey = includeon == null
? IsPrimaryKey
: includeon.IsCollection
? (Func <string, IAdoEntityInfo, Includeon, bool>)IsKeyOfMainEntityInForeign
: IsPrimaryKey;
var columns = includeon?.Info.ReaderColumns ?? mainEntityInfo.ReaderColumns;
for (var i = 0; i < columns.Length; i++)
{
var name = columns[i];
var value = reader.GetValue(i);
if (value == null || value.GetType().FullName == "System.DBNull")
{
continue;
}
if (isKey(name, mainEntityInfo, includeon))
{
keyId = value;
}
if (!item.TrySet(name, value))
{
Log.TraceEvent(TraceEventType.Warning, $"Can't set property {name} from '{entityType.FullName}' context.");
}
}
return(item);
}
