(cache)Entity Framework Core < - > PostgreSQL 間の MAX/MIN 値のやりとり (数値データ編) 2

はじめに

Entity Framework Core < - > PostgreSQL 間の MAX/MIN 値のやりとり (数値データ編) 1

続きは numeric から。

なお、前回の結果を見る限り、下記は値の範囲が異なるだけで特に結果に違いはなさそうなのでスキップすることにします。

serial (int)
real (float)
smallint (short)
smallserial (short)

numeric

やってきました numeric 。 PostgreSQL の numeric が取り得る値の範囲は、小数点より上は131072桁まで、小数点より下は16383桁まで、とのことです。

C# でこれに近いと言えそうなのは decimal ですが、値の範囲は 28 から 29 桁の数字であり、全く足りていません。

これに関しては C# の能力不足というより PostgreSQL がすごすぎる、という話ではありますが。

UPDATE "NumberSample" SET "NumericValue" = 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WHERE "Id" = 3;

恐ろしい数だ。。。

NumberSample.cs

～省略～
namespace EfCoreDataTypeSample.Models
{
    [Table("NumberSample")]
    public class NumberSample
    {
        ～省略～
        public decimal NumericValue { get; set; }       
    }
}

HomeController.cs

～省略～
public async Task> Index()
{
    return await _context.NumberSamples
        .ToListAsync();
}
～省略～

で、これを decimal 型で受け取ろうとすると。。。

OverflowException: Numeric value does not fit in a System.Decimal

ですよね～／(^o^)＼

double にしたところで 308 桁。。。

Java には BigDecimal という型があり、下記を参考にすると DB の値をそのまま持つことができそうな気がします。

が、 C# に BigDecimal はありません。

[numeric] 他の型で受け取ってみる

とりあえず DB に入っている値をそのまま受け取ることは無理そう、ということはわかりました。

では他の型で受け取ることはできないでしょうか。

値をそのまま表示するだけであれば、 string で受け取ってしまえば実現できそうです。

[numeric] string 型で受け取る

DB では計算など処理を行いたいため、カラムの型は変更せずに C# 側だけを変更したいところ。

ということで、下記のようにしてみました。

NumberSample.cs

～省略～

namespace EfCoreDataTypeSample.Models
{
    [Table("NumberSample")]
    public class NumberSample
    {
        ～省略～
        [IgnoreDataMember]
        public decimal NumericValue { get; set; }
        [NotMapped]
        public string NumericValueText { get; set; }       
    }
}

HomeController.cs

～省略～
public async Task< List< NumberSample>> Index()
{
    return await _context.NumberSamples
        .Select(n => new NumberSample
        {
            Id = n.Id,
            BigIntValue = n.BigIntValue,
            BigSerialValue = n.BigSerialValue, 
            DoubleValue = n.DoubleValue,
            IntegerValue = n.IntegerValue,
            NumericValueText = n.NumericValue.ToString(),
        })
        .ToListAsync();
}
～省略～

DB とのやりとりは NumericValue で行い、 C# での処理は NumericValueText で行います。

これで問題なく結果を受け取ることができました。

このからくりですが、まず上記を実行すると、下記のような SQL が出力されます。

SELECT n."Id", n."BigIntValue", n."BigSerialValue", n."DoubleValue", n."IntegerValue", CAST(n."NumericValue" AS text) AS "NumericValueText"
      FROM "NumberSample" AS n

DB 側で numeric 型の値が string(text) に変換され、 C# 側では変換後の値を受け取ることになるため、エラーが起きずに結果が取得できる、ということです。

注意

※ ToString() に、 ToString(CultureInfo.CurrentCulture) のように引数を渡してはいけません。

HomeController.cs

～省略～
public async Task< List< NumberSample>> Index()
{
    return await _context.NumberSamples
        .Select(n => new NumberSample
        {
            ～省略～
            NumericValueText = n.NumericValue.ToString(CultureInfo.CurrentCulture),
        })
        .ToListAsync();
}
～省略～

のように Select を書いてしまうと、下記のような SQL が出力されます。

SELECT n."Id", n."BigIntValue", n."BigSerialValue", n."DoubleValue", n."IntegerValue", n."NumericValue"
      FROM "NumberSample" AS n

SQL で CAST が実行されず、 C# 側で numeric の値を受け取って string に変換することとなり、エラーが発生します。

普通であれば特に問題も発生しないのですが、ちょっと怖い(´・ω・｀)

[numeric] BigInteger を使う

さて、受け取った値を表示することはできたわけですが、当然ながらこのままでは計算したりすることはできません。

C# でも計算する必要がある場合はどうするか。

先ほど C# に BigDecimal はない、と書きましたが、 BigInteger はあります。

BigInteger Struct (System.Numerics) - Microsoft Docs

理論上上限・下限は存在しないとのこと。

頼もしい！

BigInteger を使用するためには、 NuGet で System.Runtime.Numerics をインストールします。

で、 Integer というだけあって、扱うことができるのは整数のみです。

ということは、小数点以下をいったん整数にして、最後に戻す、という処理を行うことになります。

NumberSample.cs

using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;
using System.Numerics;
using System.Runtime.Serialization;

namespace EfCoreDataTypeSample.Models
{
    [Table("NumberSample")]
    public class NumberSample
    {
        ～省略～
        [IgnoreDataMember]
        public decimal NumericValue { get; set; }
        [NotMapped]
        public string NumericValueText { get; set; }
        
        [NotMapped]
        public BigInteger NumericValueBigInteger { get; set; }
        
    }
}

HomeController.cs

～省略～
public async Task< List< NumberSample>> Index()
{
    List< NumberSample> numberSamples = await _context.NumberSamples
        .Select(n => new NumberSample
        {
            ～省略～
            NumericValueText = n.NumericValue.ToString(),
        })
        .ToListAsync();

    // 小数点以下の数値を整数として扱うためにこの値を整数部分にかけて合算する.
    BigInteger adjuster = BigInteger.Pow(10, 16383);
    
    foreach (NumberSample numberSample in numberSamples)
    {
        string[] splitTexts = numberSample.NumericValueText.Split(".");
        if (BigInteger.TryParse(splitTexts[0], out BigInteger integerValue))
        {
            integerValue *= adjuster;

            BigInteger decimalValue;
            if (splitTexts.Length >= 2)
            {
                BigInteger.TryParse(splitTexts[1], out decimalValue);
            }
            numberSample.NumericValueBigInteger = integerValue + decimalValue;
        }
    }

    return numberSamples;
}
～省略～

うぅ。。。数字がでかすぎて、合ってるのかどうかも桁数くらいしかわからない。。。

なお BigInteger の値を JSON に渡してもエラーにはなりませんが、 Infinity になります。

まぁ当然ではありますが。

追加・更新

検索は何とかなりましたが、追加・更新はどうでしょうか。

今回調べた中では直接 SQL を書く必要がありそうです。

理由は、 C# では BigInteger 以外での(例えば decimal など)の型で値を持つことができず、小数点以下の値を持った値に戻せないためです。

検索時は Select の中で指定することで、型のキャストなどを行うことができましたが、 CREATE 、 UPDATE では SQL が発行されるのは C# でのキャストなどの処理が終わった後になるため、エラーとなります。

これを考えると、これまでとは異なり直接 SQL を書く必要がありそうです。

var bigIntegerValueText = numberSamples[0].NumericValueBigInteger.ToString();
var originalValueText = bigIntegerValueText.Insert(bigIntegerValueText.Length - 16383, ".");

var result = await _context.Database.ExecuteSqlCommandAsync(
    "UPDATE \"NumberSample\" SET \"NumericValue\" = CAST({0} as numeric), " +
    "\"DoubleValue\"= {1} WHERE \"Id\" = {2}",
    originalValueText,
    3,
    35);

トランザクションなどの処理はスキップしています。

また ExecuteSqlCommandAsync で値を渡すときに、 BigInteger をそのまま渡そうとするとエラーになりました。

上記のように string などに変換しておく必要がありそうです。

おわりに

一応これで追加や更新もできるようにはなりましたが、そもそもまともに受け取られない値を使って計算する、というのは無理があるように思います。

できれば計算などの処理ももっと DB に頼ってしまいたいところ。

次回は残っている Money 型の扱いと合わせて、 DB のトリガーを引いたり、 CRUD 以外の DB の処理は呼べるのか？といったところも調べてみたいと思います。

vaguely

和歌山に戻りました。ふらふらと色々なものに手を出す毎日。

Entity Framework Core < - > PostgreSQL 間の MAX/MIN 値のやりとり (数値データ編) 2

はじめに

numeric

NumberSample.cs

HomeController.cs

[numeric] 他の型で受け取ってみる

[numeric] string 型で受け取る

NumberSample.cs

HomeController.cs

注意

HomeController.cs

[numeric] BigInteger を使う

NumberSample.cs

HomeController.cs

追加・更新

おわりに