Question

我们现有具有多个表名的数据库。例如Documents。我正在尝试使用新的EF Core和Asp.Net Core基于本文的数据库优先方法here

我运行以下命令从现有数据库创建模型

脚手架-的DbContext “服务器=（当地）;数据库= MyDatabase的; Trusted_Connection = TRUE;” Microsoft.EntityFrameworkCore.SqlServer -OutputDir Models

然而，当我运行scaffolding命令时，它会创建具有多个名称的模型。例如，Documents表转换为模型名称Documents。

如何更改此设置以便它可以使用模型的单一命名约定？（我不能改变数据库中的表名）

请注意，我已经阅读了几篇关于同一问题的SO帖子，但他们主要关注的是代码优先方法。我正在使用数据库第一种方法。

Answer 1

在Entity Framework Core v2中，他们引入了一个多元化钩子。您可以自己复数或单一化您的对象。

您可以将此添加到您的项目中：

public class MyDesignTimeServices : IDesignTimeServices
{
    public void ConfigureDesignTimeServices(IServiceCollection services)
    {
        services.AddSingleton<IPluralizer, MyPluralizer>();
    }
}

public class MyPluralizer : IPluralizer
{
    public string Pluralize(string name)
    {
        return Inflector.Inflector.Pluralize(name) ?? name;
    }

    public string Singularize(string name)
    {
        return Inflector.Inflector.Singularize(name) ?? name;
    }
}

更多信息：What's new in EF core 2

您可以将此类用作您的Inflector：

using System.Collections.Generic;
using System.Text.RegularExpressions;

namespace DMP.Generator
{
    public static class Inflector
    {
        #region Default Rules

        static Inflector()
        {
            AddPlural("$", "s");
            AddPlural("s$", "s");
            AddPlural("(ax|test)is$", "$1es");
            AddPlural("(octop|vir|alumn|fung)us$", "$1i");
            AddPlural("(alias|status)$", "$1es");
            AddPlural("(bu)s$", "$1ses");
            AddPlural("(buffal|tomat|volcan)o$", "$1oes");
            AddPlural("([ti])um$", "$1a");
            AddPlural("sis$", "ses");
            AddPlural("(?:([^f])fe|([lr])f)$", "$1$2ves");
            AddPlural("(hive)$", "$1s");
            AddPlural("([^aeiouy]|qu)y$", "$1ies");
            AddPlural("(x|ch|ss|sh)$", "$1es");
            AddPlural("(matr|vert|ind)ix|ex$", "$1ices");
            AddPlural("([m|l])ouse$", "$1ice");
            AddPlural("^(ox)$", "$1en");
            AddPlural("(quiz)$", "$1zes");

            AddSingular("s$", "");
            AddSingular("(n)ews$", "$1ews");
            AddSingular("([ti])a$", "$1um");
            AddSingular("((a)naly|(b)a|(d)iagno|(p)arenthe|(p)rogno|(s)ynop|(t)he)ses$", "$1$2sis");
            AddSingular("(^analy)ses$", "$1sis");
            AddSingular("([^f])ves$", "$1fe");
            AddSingular("(hive)s$", "$1");
            AddSingular("(tive)s$", "$1");
            AddSingular("([lr])ves$", "$1f");
            AddSingular("([^aeiouy]|qu)ies$", "$1y");
            AddSingular("(s)eries$", "$1eries");
            AddSingular("(m)ovies$", "$1ovie");
            AddSingular("(x|ch|ss|sh)es$", "$1");
            AddSingular("([m|l])ice$", "$1ouse");
            AddSingular("(bus)es$", "$1");
            AddSingular("(o)es$", "$1");
            AddSingular("(shoe)s$", "$1");
            AddSingular("(cris|ax|test)es$", "$1is");
            AddSingular("(octop|vir|alumn|fung)i$", "$1us");
            AddSingular("(alias|status)$", "$1");
            AddSingular("(alias|status)es$", "$1");
            AddSingular("^(ox)en", "$1");
            AddSingular("(vert|ind)ices$", "$1ex");
            AddSingular("(matr)ices$", "$1ix");
            AddSingular("(quiz)zes$", "$1");

            AddIrregular("person", "people");
            AddIrregular("man", "men");
            AddIrregular("child", "children");
            AddIrregular("sex", "sexes");
            AddIrregular("move", "moves");
            AddIrregular("goose", "geese");
            AddIrregular("alumna", "alumnae");

            AddUncountable("equipment");
            AddUncountable("information");
            AddUncountable("rice");
            AddUncountable("money");
            AddUncountable("species");
            AddUncountable("series");
            AddUncountable("fish");
            AddUncountable("sheep");
            AddUncountable("deer");
            AddUncountable("aircraft");
        }

        #endregion

        private class Rule
        {
            private readonly Regex _regex;
            private readonly string _replacement;

            public Rule(string pattern, string replacement)
            {
                _regex = new Regex(pattern, RegexOptions.IgnoreCase);
                _replacement = replacement;
            }

            public string Apply(string word)
            {
                if (!_regex.IsMatch(word))
                {
                    return null;
                }

                return _regex.Replace(word, _replacement);
            }
        }

        private static void AddIrregular(string singular, string plural)
        {
            AddPlural("(" + singular[0] + ")" + singular.Substring(1) + "$", "$1" + plural.Substring(1));
            AddSingular("(" + plural[0] + ")" + plural.Substring(1) + "$", "$1" + singular.Substring(1));
        }

        private static void AddUncountable(string word)
        {
            _uncountables.Add(word.ToLower());
        }

        private static void AddPlural(string rule, string replacement)
        {
            _plurals.Add(new Rule(rule, replacement));
        }

        private static void AddSingular(string rule, string replacement)
        {
            _singulars.Add(new Rule(rule, replacement));
        }

        private static readonly List<Rule> _plurals = new List<Rule>();
        private static readonly List<Rule> _singulars = new List<Rule>();
        private static readonly List<string> _uncountables = new List<string>();

        public static string Pluralize(this string word)
        {
            return ApplyRules(_plurals, word);
        }

        public static string Singularize(this string word)
        {
            return ApplyRules(_singulars, word);
        }

#if NET45 || NETFX_CORE
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
#endif
        private static string ApplyRules(List<Rule> rules, string word)
        {
            string result = word;

            if (!_uncountables.Contains(word.ToLower()))
            {
                for (int i = rules.Count - 1; i >= 0; i--)
                {
                    if ((result = rules[i].Apply(word)) != null)
                    {
                        break;
                    }
                }
            }

            return result;
        }

        public static string Titleize(this string word)
        {
            return Regex.Replace(Humanize(Underscore(word)), @"\b([a-z])",
                                 delegate (Match match)
                                 {
                                     return match.Captures[0].Value.ToUpper();
                                 });
        }

        public static string Humanize(this string lowercaseAndUnderscoredWord)
        {
            return Capitalize(Regex.Replace(lowercaseAndUnderscoredWord, @"_", " "));
        }

        public static string Pascalize(this string lowercaseAndUnderscoredWord)
        {
            return Regex.Replace(lowercaseAndUnderscoredWord, "(?:^|_)(.)",
                                 delegate (Match match)
                                 {
                                     return match.Groups[1].Value.ToUpper();
                                 });
        }

        public static string Camelize(this string lowercaseAndUnderscoredWord)
        {
            return Uncapitalize(Pascalize(lowercaseAndUnderscoredWord));
        }

        public static string Underscore(this string pascalCasedWord)
        {
            return Regex.Replace(
                Regex.Replace(
                    Regex.Replace(pascalCasedWord, @"([A-Z]+)([A-Z][a-z])", "$1_$2"), @"([a-z\d])([A-Z])",
                    "$1_$2"), @"[-\s]", "_").ToLower();
        }

        public static string Capitalize(this string word)
        {
            return word.Substring(0, 1).ToUpper() + word.Substring(1).ToLower();
        }

        public static string Uncapitalize(this string word)
        {
            return word.Substring(0, 1).ToLower() + word.Substring(1);
        }

        public static string Ordinalize(this string numberString)
        {
            return Ordanize(int.Parse(numberString), numberString);
        }

        public static string Ordinalize(this int number)
        {
            return Ordanize(number, number.ToString());
        }

#if NET45 || NETFX_CORE
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
#endif
        private static string Ordanize(int number, string numberString)
        {
            int nMod100 = number % 100;

            if (nMod100 >= 11 && nMod100 <= 13)
            {
                return numberString + "th";
            }

            switch (number % 10)
            {
                case 1:
                    return numberString + "st";
                case 2:
                    return numberString + "nd";
                case 3:
                    return numberString + "rd";
                default:
                    return numberString + "th";
            }
        }


        public static string Dasherize(this string underscoredWord)
        {
            return underscoredWord.Replace('_', '-');
        }
    }
}

可以找到inflector类here

对于脚手架，我使用dotnet ef命令。

我的项目中包含以下NuGet包：

  <ItemGroup>
    <PackageReference Include="Microsoft.EntityFrameworkCore" Version="2.0.1" />
    <PackageReference Include="Microsoft.EntityFrameworkCore.Design" Version="2.0.1" />
    <PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer" Version="2.0.1" />
    <PackageReference Include="Microsoft.EntityFrameworkCore.Tools" Version="2.0.1" />
    <PackageReference Include="Microsoft.EntityFrameworkCore.Tools.DotNet" Version="2.0.1" />
    <PackageReference Include="Microsoft.VisualStudio.Web.CodeGeneration.Tools" Version="2.0.1" />
  </ItemGroup>
  <ItemGroup>
    <DotNetCliToolReference Include="Microsoft.EntityFrameworkCore.Tools" Version="2.0.1" />
    <DotNetCliToolReference Include="Microsoft.EntityFrameworkCore.Tools.DotNet" Version="2.0.1" />
  </ItemGroup>

Answer 2

您可以使用for radio button circle color change。要使用该软件包，只需安装它。从现有数据库对模型进行逆向工程时，将使用复数形式。

// Tools > NuGet Package manager > Package Manager Console:
PM> Install-Package Bricelam.EntityFrameworkCore.Pluralizer

然后运行您的Scaffold-DbContext ...命令。就是这样！

Scaffold-DbContext "ConnectionStr..." Microsoft.EntityFrameworkCore.SqlServer -OutputDir Models

Answer 3

逆向工程目前不是单一化（是一个单词吗？）实体类型的表名，还是将它们复数为导航属性。这是问题#3060。在此之前，您必须在生成代码后手动将它们更改为您想要的内容。

Answer 4

EF Core工具目前不包含以您描述的方式自定义现有数据库逆向工程输出的选项。目前，您唯一可行的选择是修改生成的代码。

EntityFramework核心数据库首先接近多个表名

4 个答案: