我不知道如何从字符串中取出json并将其插入我的数据库之后。你能帮助我吗？ 我知道json字符串很抱歉。
真的不知道如何把它放在数据库中。实际上我不知道我甚至不知道gdata是否已被填充
namespace Gamer.DataLayer.Migrations
{
using DomainClasses.Models;
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;
using System;
using System.Collections.Generic;
using System.Data.Entity;
using System.Data.Entity.Migrations;
using System.Diagnostics;
using System.IO;
using System.Linq;
public sealed class Configuration : DbMigrationsConfiguration<Gamer.DataLayer.GamerContext>
{
#region
private string _json = @"{""Games"":[
{
""EAN"":""2750026762618"",
""GameName"":""Uncharted 4"",
""Language"":""en|nl"",
""GameGenres"":
[
{
""GameId"": ""2750026762618"",
""Genre"":{
""GenreId"":""1"",
""GenreName"":""Actie""}
},
{
""GameId"": ""2750026762618"",
""Genre"":{
""GenreId"":""2"",
""GenreName"":""Avontuur""}
},
{
""GameId"": ""2750026762618"",
""Genre"":{
""GenreId"":""9"",
""GenreName"":""Role Playing Game""}
},
{
""GameId"": ""2750026762618"",
""Genre"":{
""GenreId"":""10"",
""GenreName"":""Shooter""}
}
],
""PlatformGames"":
[
{
""GameId"":""2750026762618"",
""Platform"":{
""PlatformId"":""2"",
""PlatformName"":""Playstation 4""},
""Price"":""59.99""
}
]
},
{
""EAN"":""5030944112878"",
""GameName"":""Fifa 16"",
""Language"":""en"",
""GameGenres"":
[
{
""GameId"": ""5030944112878"",
""Genre"":{
""GenreId"":""1"",
""GenreName"":""Actie""}
},
{
""GameId"": ""5030944112878"",
""Genre"":{
""GenreId"":""12"",
""GenreName"":""Sport""}
}
],
""PlatformGames"":
[
{
""GameId"":""5030944112878"",
""Platform"":{
""PlatformId"":""1"",
""PlatformName"":""PC""},
""Price"":""34.99""
},
{
""GameId"":""5030944112878"",
""Platform"":{
""PlatformId"":""2"",
""PlatformName"":""Playstation 4""},
""Price"":""39.99""
},
{
""GameId"":""5030944112878"",
""Platform"":{
""PlatformId"":""3"",
""PlatformName"":""Xbox One""},
""Price"":""39.99""
}
]
},
{
""EAN"":""5030948112294"",
""GameName"":""De Sims 4"",
""Language"":""nl"",
""GameGenres"":
[
{
""GameId"": ""5030948112294"",
""Genre"":{
""GenreId"":""11"",
""GenreName"":""Simulatie""}
}
],
""PlatformGames"":
[
{
""GameId"":""5030948112294"",
""Platform"":{
""PlatformId"":""1"",
""PlatformName"":""PC""},
""Price"":""71.08""
}
]
},
{
""EAN"":""5030949112576"",
""GameName"":""Star Wars Battlefront"",
""Language"":""en"",
""GameGenres"":
[
{
""GameId"": ""5030949112576"",
""Genre"":{
""GenreId"":""2"",
""GenreName"":""Avontuur""}
},
{
""GameId"": ""5030949112576"",
""Genre"":{
""GenreId"":""10"",
""GenreName"":""Shooter""}
}
],
""PlatformGames"":
[
{
""GameId"":""5030949112576"",
""Platform"":{
""PlatformId"":""1"",
""PlatformName"":""PC""},
""Price"":""24.99""
},
{
""GameId"":""5030949112576"",
""Platform"":{
""PlatformId"":""2"",
""PlatformName"":""Playstation 4""},
""Price"":""24.99""
},
{
""GameId"":""5030949112576"",
""Platform"":{
""PlatformId"":""3"",
""PlatformName"":""Xbox One""},
""Price"":""34.99""
}
]
},
{
""EAN"":""5055856403357"",
""GameName"":""Doom"",
""Language"":""en"",
""GameGenres"":
[
{
""GameId"": ""5055856403357"",
""Genre"":{
""GenreId"":""1"",
""GenreName"":""Actie""}
}
],
""PlatformGames"":
[
{
""GameId"":""5055856403357"",
""Platform"":{
""PlatformId"":""1"",
""PlatformName"":""PC""},
""Price"":""49.99""
},
{
""GameId"":""5055856403357"",
""Platform"":{
""PlatformId"":""2"",
""PlatformName"":""Playstation 4""},
""Price"":""59.99""
},
{
""GameId"":""5055856403357"",
""Platform"":{
""PlatformId"":""3"",
""PlatformName"":""Xbox One""},
""Price"":""59.99""
}
]
},
{
""EAN"":""5060146463188"",
""GameName"":""Minecraft Story Mode"",
""Language"":""nl"",
""GameGenres"":
[
{
""GameId"": ""5060146463188"",
""Genre"":{
""GenreId"":""2"",
""GenreName"":""Avontuur""}
}
],
""PlatformGames"":
[
{
""GameId"":""5060146463188"",
""Platform"":{
""PlatformId"":""2"",
""PlatformName"":""Playstation 4""},
""Price"":""30.99""
},
{
""GameId"":""5060146463188"",
""Platform"":{
""PlatformId"":""3"",
""PlatformName"":""Xbox One""},
""Price"":""31.99""
},
{
""GameId"":""5060146463188"",
""Platform"":{
""PlatformId"":""4"",
""PlatformName"":""Wii U""},
""Price"":""39.99""
}
]
},
{
""EAN"":""5055856406136"",
""GameName"":""Fallout 4"",
""Language"":""en"",
""GameGenres"":
[
{
""GameId"": ""5055856406136"",
""Genre"":{
""GenreId"":""1"",
""GenreName"":""Actie""}
},
{
""GameId"": ""5055856406136"",
""Genre"":{
""GenreId"":""2"",
""GenreName"":""Avontuur""}
},
{
""GameId"": ""5055856406136"",
""Genre"":{
""GenreId"":""5"",
""GenreName"":""Open wereld""}
},
{
""GameId"": ""5055856406136"",
""Genre"":{
""GenreId"":""9"",
""GenreName"":""Role Playing Game""}
},
{
""GameId"": ""5055856406136"",
""Genre"":{
""GenreId"":""10"",
""GenreName"":""Shooter""}
}
],
""PlatformGames"":
[
{
""GameId"":""5055856406136"",
""Platform"":{
""PlatformId"":""1"",
""PlatformName"":""PC""},
""Price"":""114.4""
},
{
""GameId"":""5055856406136"",
""Platform"":{
""PlatformId"":""2"",
""PlatformName"":""Playstation 4""},
""Price"":""264.99""
},
{
""GameId"":""5055856406136"",
""Platform"":{
""PlatformId"":""3"",
""PlatformName"":""Xbox One""},
""Price"":""114.99""
}
]
}
]
}";
#endregion
public Configuration()
{
// TODO:configure migrations
}
protected override void Seed(Gamer.DataLayer.GamerContext context)
{
// TODO:
// Create a class GamerData to store a list of Games
// Deserialize the JSON string to a GamerData object (call this object gdata)
var gdata = JsonConvert.DeserializeObject<GamerContext>(_json);
foreach (var game in gdata.Games)
{
foreach (var gameGenre in game.GameGenres)
{
Genre myGenre = context.Genres.Where(g => g.GenreId == gameGenre.GenreId).FirstOrDefault();
if (myGenre != null)
gameGenre.GenreId = myGenre.GenreId;
}
foreach (var platformGame in game.PlatformGames)
{
Platform myPlatform = context.Platforms.Where(p => p.PlatformId == platformGame.Platform.PlatformId).FirstOrDefault();
if (myPlatform != null)
platformGame.Platform = myPlatform;
}
// Add the data to your database
}
}
}
}
更多信息
GamerContext
using Gamer.DomainClasses.Models;
using System;
using System.Collections.Generic;
using System.Data.Entity;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace Gamer.DataLayer
{
public class GamerContext : DbContext
{
public GamerContext() : base("Gamer")
{ }
public DbSet<Game> Games { get; set; }
public DbSet<Genre> Genres { get; set; }
public DbSet<PlatformGame> PlatformGames { get; set; }
public DbSet<Platform> Platforms { get; set; }
public DbSet<GameGenre> GameGenres { get; set; }
}
}
我的模特（留下使用）
游戏
namespace Gamer.DomainClasses.Models
{
public class Game
{
[Key]
[DatabaseGenerated(DatabaseGeneratedOption.None)]
[Required(ErrorMessage = "Key is required")]
public string EAN { get; set; }
public string GameName { get; set; }
public string Language { get; set; }
public virtual ICollection<PlatformGame> PlatformGames { get; set; }
public virtual ICollection<Genre> Genres { get; set; }
public virtual ICollection<Genre> GameGenres { get; set; }
}
}
GameGenre
namespace Gamer.DomainClasses.Models
{
public class GameGenre
{
[Key, ForeignKey("Game")]
[Required(ErrorMessage = "Key is required")]
public string EAN { get; set; }
[Key, ForeignKey("Genre")]
[Required(ErrorMessage = "Key is required")]
public int GenreId {get;set;}
public virtual ICollection<Genre> Genre { get; set; }
}
}
类型
namespace Gamer.DomainClasses.Models
{
public class Genre
{
[Key]
[DatabaseGenerated(DatabaseGeneratedOption.None)]
[Required(ErrorMessage = "Key is required")]
public int GenreId { get; set; }
public string GenreName { get; set; }
public virtual ICollection<Game> Games { get; set; }
}
}
平台
namespace Gamer.DomainClasses.Models
{
public class Platform
{
[Key]
[DatabaseGenerated(DatabaseGeneratedOption.None)]
[Required(ErrorMessage = "Key is required")]
public int PlatformId { get; set; }
public string PlatformName { get; set; }
public virtual ICollection<PlatformGame> PlatformGames { get; set; }
}
}
PlatformGame
namespace Gamer.DomainClasses.Models
{
public class PlatformGame
{
[Key, ForeignKey("Platoform")]
[Required(ErrorMessage = "Key is required")]
public int PlatformId { get; set; }
[Key, ForeignKey("Game")]
[Required(ErrorMessage = "Key is required")]
public string EAN { get; set; }
public float Price { get; set; }
public virtual Game Game { get; set; }
public virtual Platform Platform { get; set; }
}
}
的Web.config
<?xml version="1.0" encoding="utf-8"?>
<!--
For more information on how to configure your ASP.NET application, please visit
http://go.microsoft.com/fwlink/?LinkId=301880
-->
<configuration>
<configSections>
<!-- For more information on Entity Framework configuration, visit http://go.microsoft.com/fwlink/?LinkID=237468 -->
<section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
</configSections>
<connectionStrings>
<add name="DefaultConnection" connectionString="Data Source=(LocalDb)\MSSQLLocalDB;AttachDbFilename=|DataDirectory|\aspnet-Gamer-20160510103314.mdf;Initial Catalog=aspnet-Gamer-20160510103314;Integrated Security=True" providerName="System.Data.SqlClient" />
</connectionStrings>
<appSettings>
<add key="webpages:Version" value="3.0.0.0" />
<add key="webpages:Enabled" value="false" />
<add key="ClientValidationEnabled" value="true" />
<add key="UnobtrusiveJavaScriptEnabled" value="true" />
</appSettings>
<system.web>
<authentication mode="None" />
<compilation debug="true" targetFramework="4.5.2" />
<httpRuntime targetFramework="4.5.2" />
<httpModules>
<add name="ApplicationInsightsWebTracking" type="Microsoft.ApplicationInsights.Web.ApplicationInsightsHttpModule, Microsoft.AI.Web" />
</httpModules>
</system.web>
<system.webServer>
<modules>
<remove name="FormsAuthentication" />
<remove name="ApplicationInsightsWebTracking" />
<add name="ApplicationInsightsWebTracking" type="Microsoft.ApplicationInsights.Web.ApplicationInsightsHttpModule, Microsoft.AI.Web" preCondition="managedHandler" />
</modules>
<validation validateIntegratedModeConfiguration="false" />
</system.webServer>
<runtime>
<assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
<dependentAssembly>
<assemblyIdentity name="Microsoft.Owin.Security" publicKeyToken="31bf3856ad364e35" />
<bindingRedirect oldVersion="0.0.0.0-3.0.1.0" newVersion="3.0.1.0" />
</dependentAssembly>
<dependentAssembly>
<assemblyIdentity name="Microsoft.Owin.Security.OAuth" publicKeyToken="31bf3856ad364e35" />
<bindingRedirect oldVersion="0.0.0.0-3.0.1.0" newVersion="3.0.1.0" />
</dependentAssembly>
<dependentAssembly>
<assemblyIdentity name="Microsoft.Owin.Security.Cookies" publicKeyToken="31bf3856ad364e35" />
<bindingRedirect oldVersion="0.0.0.0-3.0.1.0" newVersion="3.0.1.0" />
</dependentAssembly>
<dependentAssembly>
<assemblyIdentity name="Microsoft.Owin" publicKeyToken="31bf3856ad364e35" />
<bindingRedirect oldVersion="0.0.0.0-3.0.1.0" newVersion="3.0.1.0" />
</dependentAssembly>
<dependentAssembly>
<assemblyIdentity name="Newtonsoft.Json" culture="neutral" publicKeyToken="30ad4fe6b2a6aeed" />
<bindingRedirect oldVersion="0.0.0.0-8.0.0.0" newVersion="8.0.0.0" />
</dependentAssembly>
<dependentAssembly>
<assemblyIdentity name="System.Web.Optimization" publicKeyToken="31bf3856ad364e35" />
<bindingRedirect oldVersion="1.0.0.0-1.1.0.0" newVersion="1.1.0.0" />
</dependentAssembly>
<dependentAssembly>
<assemblyIdentity name="WebGrease" publicKeyToken="31bf3856ad364e35" />
<bindingRedirect oldVersion="0.0.0.0-1.6.5135.21930" newVersion="1.6.5135.21930" />
</dependentAssembly>
<dependentAssembly>
<assemblyIdentity name="System.Web.Helpers" publicKeyToken="31bf3856ad364e35" />
<bindingRedirect oldVersion="1.0.0.0-3.0.0.0" newVersion="3.0.0.0" />
</dependentAssembly>
<dependentAssembly>
<assemblyIdentity name="System.Web.Mvc" publicKeyToken="31bf3856ad364e35" />
<bindingRedirect oldVersion="1.0.0.0-5.2.3.0" newVersion="5.2.3.0" />
</dependentAssembly>
<dependentAssembly>
<assemblyIdentity name="System.Web.WebPages" publicKeyToken="31bf3856ad364e35" />
<bindingRedirect oldVersion="1.0.0.0-3.0.0.0" newVersion="3.0.0.0" />
</dependentAssembly>
<dependentAssembly>
<assemblyIdentity name="Antlr3.Runtime" publicKeyToken="eb42632606e9261f" culture="neutral" />
<bindingRedirect oldVersion="0.0.0.0-3.5.0.2" newVersion="3.5.0.2" />
</dependentAssembly>
</assemblyBinding>
</runtime>
<entityFramework>
<defaultConnectionFactory type="System.Data.Entity.Infrastructure.LocalDbConnectionFactory, EntityFramework">
<parameters>
<parameter value="mssqllocaldb" />
</parameters>
</defaultConnectionFactory>
<providers>
<provider invariantName="System.Data.SqlClient" type="System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer" />
</providers>
</entityFramework>
<system.codedom>
<compilers>
<compiler language="c#;cs;csharp" extension=".cs" type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.CSharpCodeProvider, Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" warningLevel="4" compilerOptions="/langversion:6 /nowarn:1659;1699;1701" />
<compiler language="vb;vbs;visualbasic;vbscript" extension=".vb" type="Microsoft.CodeDom.Providers.DotNetCompilerPlatform.VBCodeProvider, Microsoft.CodeDom.Providers.DotNetCompilerPlatform, Version=1.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" warningLevel="4" compilerOptions="/langversion:14 /nowarn:41008 /define:_MYTYPE=\"Web\" /optionInfer+" />
</compilers>
</system.codedom>
</configuration>
当我在软件包管理器控制台中尝试更新数据库时
PM> update-database -verbose
Using StartUp project 'Gamer'.
Using NuGet project 'Gamer'.
Specify the '-Verbose' flag to view the SQL statements being applied to the target database.
Target database is: 'aspnet-Gamer-20160510103314' (DataSource: (LocalDb)\MSSQLLocalDB, Provider: System.Data.SqlClient, Origin: Configuration).
No pending explicit migrations.
Unable to update database to match the current model because there are pending changes and automatic migration is disabled. Either write the pending model changes to a code-based migration or enable automatic migration. Set DbMigrationsConfiguration.AutomaticMigrationsEnabled to true to enable automatic migration.
You can use the Add-Migration command to write the pending model changes to a code-based migration.
答案 0 :(得分：1)
protected override void Seed(Gamer.DataLayer.GamerContext context)
{
GamerData gdata = JsonConvert.DeserializeObject<GamerData>(_json);
foreach (var game in gdata.Games)
{
foreach (var gameGenre in game.GameGenres)
{
Genre myGenre = context.Genres.Where(g => g.GenreId == gameGenre.Genre.GenreId).FirstOrDefault();
if (myGenre != null)
gameGenre.Genre = myGenre;
}
foreach (var platformGame in game.PlatformGames)
{
Platform myPlatform = context.Platforms.Where(p => p.PlatformId == platformGame.Platform.PlatformId).FirstOrDefault();
if (myPlatform != null)
platformGame.Platform = myPlatform;
}
context.Games.Add(game);
context.SaveChanges();
}
}
老师忘了添加数据库的布局，所以你必须猜测种子方法中的变量。