private bool TryGetInternal(UInt32 dbi, byte[] key, out Func<byte[]> valueFactory)
{
valueFactory = null;
using (var keyMarshalStruct = new MarshalValueStructure(key))
{
var valueStruct = default(ValueStructure);
var keyStructure = keyMarshalStruct.ValueStructure;
var res = Native.Read(() => Native.mdb_get(_handle, dbi, ref keyStructure, out valueStruct));
var exists = res != Native.MDB_NOTFOUND;
if (exists)
valueFactory = () => valueStruct.ToByteArray(res);
return exists;
}
}
public KeyValuePair<byte[], byte[]> MoveToFirstAfter(byte[] key)
{
using(var marshalKey = new MarshalValueStructure(key))
return this.Get(CursorOperation.SetRange, marshalKey.ValueStructure);
}
public KeyValuePair<byte[], byte[]> MoveToFirstValueAfter(byte[] key, byte[] value)
{
using (var marshalKey = new MarshalValueStructure(key))
using (var marshalValue = new MarshalValueStructure(value))
return this.Get(CursorOperation.GetBothRange, marshalKey.ValueStructure, marshalValue.ValueStructure);
}
//TODO: tests
public void Put(byte[] key, byte[] value, PutOptions options)
{
using(var keyMarshalStruct = new MarshalValueStructure(key))
using (var valueMarshalStruct = new MarshalValueStructure(value))
{
var keyStruct = keyMarshalStruct.ValueStructure;
var valueStruct = valueMarshalStruct.ValueStructure;
Native.Execute(lib => lib.mdb_cursor_put(_handle, keyStruct, valueStruct, options));
}
}
public void Delete(LightningDatabase db, byte[] key, byte[] value = null)
{
if (db == null)
throw new ArgumentNullException("db");
using (var keyMarshalStruct = new MarshalValueStructure(key))
{
var keyStructure = keyMarshalStruct.ValueStructure;
if (value != null)
{
using (var valueMarshalStruct = new MarshalValueStructure(value))
{
var valueStructure = valueMarshalStruct.ValueStructure;
Native.Execute(() => Native.mdb_del(_handle, db._handle, ref keyStructure, ref valueStructure));
return;
}
}
Native.Execute(() => Native.mdb_del(_handle, db._handle, ref keyStructure, IntPtr.Zero));
}
}
public void Put(LightningDatabase db, byte[] key, byte[] value, PutOptions options = PutOptions.None)
{
if (db == null)
throw new ArgumentNullException("db");
using (var keyStructureMarshal = new MarshalValueStructure(key))
using (var valueStructureMarshal = new MarshalValueStructure(value))
{
var keyStruct = keyStructureMarshal.ValueStructure;
var valueStruct = valueStructureMarshal.ValueStructure;
Native.Execute(() => Native.mdb_put(_handle, db._handle, ref keyStruct, ref valueStruct, options));
}
}