59 lines
3.4 KiB
C#
59 lines
3.4 KiB
C#
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using System;
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using System.Data.Common;
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using System.Threading;
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using System.Threading.Tasks;
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namespace FruityFoundation.Base.Structures;
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public static class DbDataReaderMaybeExtensions
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{
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public static async Task<Maybe<bool>> TryGetBooleanAsync(this DbDataReader reader, int ord, CancellationToken cancellationToken = default) =>
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await TryGetAsync(reader, ord, reader.GetBoolean, cancellationToken);
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public static async Task<Maybe<byte>> TryGetByteAsync(this DbDataReader reader, int ord, CancellationToken cancellationToken = default) =>
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await TryGetAsync(reader, ord, reader.GetByte, cancellationToken);
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public static async Task<Maybe<long>> TryGetBytesAsync(this DbDataReader reader, int ord, long fieldOffset, byte[]? buffer, int bufferOffset, int length, CancellationToken cancellationToken = default) =>
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await TryGetAsync(reader, ord, _ => reader.GetBytes(ord, fieldOffset, buffer, bufferOffset, length), cancellationToken);
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public static async Task<Maybe<char>> TryGetCharAsync(this DbDataReader reader, int ord, CancellationToken cancellationToken = default) =>
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await TryGetAsync(reader, ord, reader.GetChar, cancellationToken);
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public static async Task<Maybe<long>> TryGetCharsAsync(this DbDataReader reader, int ord, long fieldOffset, char[]? buffer, int bufferOffset, int length, CancellationToken cancellationToken = default) =>
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await TryGetAsync(reader, ord, _ => reader.GetChars(ord, fieldOffset, buffer, bufferOffset, length), cancellationToken);
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public static async Task<Maybe<DateTime>> TryGetDateTimeAsync(this DbDataReader reader, int ord, CancellationToken cancellationToken = default) =>
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await TryGetAsync(reader, ord, reader.GetDateTime, cancellationToken);
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public static async Task<Maybe<decimal>> TryGetDecimalAsync(this DbDataReader reader, int ord, CancellationToken cancellationToken = default) =>
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await TryGetAsync(reader, ord, reader.GetDecimal, cancellationToken);
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public static async Task<Maybe<float>> TryGetFloatAsync(this DbDataReader reader, int ord, CancellationToken cancellationToken = default) =>
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await TryGetAsync(reader, ord, reader.GetFloat, cancellationToken);
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public static async Task<Maybe<Guid>> TryGetGuidAsync(this DbDataReader reader, int ord, CancellationToken cancellationToken = default) =>
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await TryGetAsync(reader, ord, reader.GetGuid, cancellationToken);
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public static async Task<Maybe<short>> TryGetInt16Async(this DbDataReader reader, int ord, CancellationToken cancellationToken = default) =>
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await TryGetAsync(reader, ord, reader.GetInt16, cancellationToken);
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public static async Task<Maybe<int>> TryGetInt32Async(this DbDataReader reader, int ord, CancellationToken cancellationToken = default) =>
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await TryGetAsync(reader, ord, reader.GetInt32, cancellationToken);
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public static async Task<Maybe<long>> TryGetInt64Async(this DbDataReader reader, int ord, CancellationToken cancellationToken = default) =>
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await TryGetAsync(reader, ord, reader.GetInt64, cancellationToken);
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public static async Task<Maybe<string>> TryGetStringAsync(this DbDataReader reader, int ord, CancellationToken cancellationToken = default) =>
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await TryGetAsync(reader, ord, reader.GetString, cancellationToken);
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private static async Task<Maybe<T>> TryGetAsync<T>(DbDataReader reader, int ord, Func<int, T> valueGetter, CancellationToken cancellationToken)
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{
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if (await reader.IsDBNullAsync(ord, cancellationToken))
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return Maybe.Empty<T>();
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var value = valueGetter(ord);
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return Maybe.Create(value);
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}
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}
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