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UnrecognizedTypeHandler.cs
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executable file
·36 lines (34 loc) · 1.38 KB
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using NpgsqlTypes;
using System;
using System.Collections.Generic;
using System.Data;
using System.Linq;
using System.Text;
using Npgsql.BackendMessages;
namespace Npgsql.TypeHandlers
{
/// <summary>
/// Handles "conversions" for columns sent by the database with unknown OIDs.
/// This differs from TextHandler in that its a text-only handler (we don't want to receive binary
/// representations of the types registered here).
/// Note that this handler is also used in the very initial query that loads the OID mappings
/// (chicken and egg problem).
/// Also used for sending parameters with unknown types (OID=0)
/// </summary>
internal class UnrecognizedTypeHandler : TextHandler
{
internal UnrecognizedTypeHandler()
{
OID = 0;
PgName = "<unknown>";
}
internal override void PrepareRead(NpgsqlBuffer buf, FieldDescription fieldDescription, int len)
{
if (fieldDescription.IsBinaryFormat) {
buf.Skip(len);
throw new SafeReadException(new NotSupportedException(String.Format("The field {0} has a type currently unknown to Npgsql (OID {1}). You can retrieve it as a string by marking it as unknown, please see the FAQ.", fieldDescription.Name, fieldDescription.OID)));
}
base.PrepareRead(buf, fieldDescription, len);
}
}
}