private void InitializeKey(KeyReader key)
{
if (key.Reference != null)
{
foreach (DataReader value in key.Values)
{
value.KeyType = value.Metadata.Type.GetKeyType();
}
key.KeyType = CompositeKey.Create(key.Values.Select(v => v.KeyType));
if (key.Values.Count > 1)
{
key.Variable = Expression.Variable(key.KeyType);
}
if (key.Reference.HasFlag(ReferenceFlags.Self))
{
key.Reference = this.GetRecursiveReference(key.Reference);
}
}
foreach (DataReader value in key.Values)
{
value.IsDbNull ??= this.GetNamedVariable(typeof(bool), value, "_isnull");
value.Variable ??= this.GetNamedVariable(value.KeyType, value);
}
}