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TimeHandler.cs
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50 lines (43 loc) · 1.9 KB
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using NodaTime;
using Npgsql.BackendMessages;
using Npgsql.TypeHandling;
#pragma warning disable CS1591 // Missing XML comment for publicly visible type or member
namespace Npgsql.NodaTime
{
public class TimeHandlerFactory : NpgsqlTypeHandlerFactory<LocalTime>
{
// Check for the legacy floating point timestamps feature
protected override NpgsqlTypeHandler<LocalTime> Create(NpgsqlConnection conn)
=> new TimeHandler(conn.HasIntegerDateTimes);
}
class TimeHandler : NpgsqlSimpleTypeHandler<LocalTime>
{
/// <summary>
/// A deprecated compile-time option of PostgreSQL switches to a floating-point representation of some date/time
/// fields. Some PostgreSQL-like databases (e.g. CrateDB) use floating-point representation by default and do not
/// provide the option of switching to integer format.
/// </summary>
readonly bool _integerFormat;
public TimeHandler(bool integerFormat)
{
_integerFormat = integerFormat;
}
public override LocalTime Read(NpgsqlReadBuffer buf, int len, FieldDescription fieldDescription = null)
{
if (_integerFormat)
// PostgreSQL time resolution == 1 microsecond == 10 ticks
return LocalTime.FromTicksSinceMidnight(buf.ReadInt64() * 10);
else
return LocalTime.FromTicksSinceMidnight((long)(buf.ReadDouble() * NodaConstants.TicksPerSecond));
}
public override int ValidateAndGetLength(LocalTime value, NpgsqlParameter parameter)
=> 8;
public override void Write(LocalTime value, NpgsqlWriteBuffer buf, NpgsqlParameter parameter)
{
if (_integerFormat)
buf.WriteInt64(value.TickOfDay / 10);
else
buf.WriteDouble((double)value.TickOfDay / NodaConstants.TicksPerSecond);
}
}
}