public void TransactionShouldSupportCustomDupSorter()
{
Func <int, int, int> comparison = (l, r) => - Math.Sign(l - r);
var txn = _env.BeginTransaction();
var options = new DatabaseConfiguration {
Flags = DatabaseOpenFlags.Create | DatabaseOpenFlags.DuplicatesFixed
};
Func <MDBValue, MDBValue, int> compareWith = (l, r) => comparison(BitConverter.ToInt32(l.CopyToNewArray(), 0), BitConverter.ToInt32(r.CopyToNewArray(), 0));
options.FindDuplicatesWith(Comparer <MDBValue> .Create(new Comparison <MDBValue>(compareWith)));
var db = txn.OpenDatabase(configuration: options);
var valuesUnsorted = new [] { 2, 10, 5, 0 };
var valuesSorted = valuesUnsorted.ToArray();
Array.Sort(valuesSorted, new Comparison <int>(comparison));
using (var c = txn.CreateCursor(db))
c.Put(BitConverter.GetBytes(123), valuesUnsorted.Select(BitConverter.GetBytes).ToArray());
using (var c = txn.CreateCursor(db))
{
int order = 0;
while (c.Next() == MDBResultCode.Success)
{
Assert.Equal(valuesSorted[order++], BitConverter.ToInt32(c.GetCurrent().value.CopyToNewArray(), 0));
}
}
}
public void TransactionShouldSupportCustomDupSorter()
{
Func<int, int, int> comparison = (l, r) => -Math.Sign(l - r);
var txn = _env.BeginTransaction();
var options = new DatabaseConfiguration {Flags = DatabaseOpenFlags.Create | DatabaseOpenFlags.DuplicatesFixed};
Func<byte[], byte[], int> compareWith = (l, r) => comparison(BitConverter.ToInt32(l, 0), BitConverter.ToInt32(r, 0));
options.FindDuplicatesWith(Comparer<byte[]>.Create(new Comparison<byte[]>(compareWith)));
var db = txn.OpenDatabase(configuration: options);
var valuesUnsorted = new [] { 2, 10, 5, 0 };
var valuesSorted = valuesUnsorted.ToArray();
Array.Sort(valuesSorted, new Comparison<int>(comparison));
using (var c = txn.CreateCursor(db))
c.PutMultiple(BitConverter.GetBytes(123), valuesUnsorted.Select(BitConverter.GetBytes).ToArray());
using (var c = txn.CreateCursor(db))
{
int order = 0;
while (c.MoveNext())
Assert.Equal(valuesSorted[order++], BitConverter.ToInt32(c.Current.Value, 0));
}
}
