我对 ASP.NET Core 开发完全陌生。我正在尝试使用单个模型和 mysql 创建一个简单的 asp.net core Web api 来存储模型数据,然后我想使用 Swagger 将其作为 REST API 检索。
我当前的设置如下所示:
Books.cs:
using Microsoft.EntityFrameworkCore;
using MySQL.Data.EntityFrameworkCore.Extensions;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
namespace New_Api.Models
{
public class Book
{
public int Id { get; set; }
public string Name { get; set; }
public string Author { get; set; }
public decimal Price { get; set; }
public DateTime CreatedOn { get; set; } = DateTime.UtcNow;
}
public class WebAPIDataContext : DbContext
{
public WebAPIDataContext(DbContextOptions<WebAPIDataContext> options)
: base(options)
{
}
public DbSet<Book> Books { get; set; }
}
}
项目.json:
{
"dependencies": {
"Microsoft.NETCore.App": {
"version": "1.0.1",
"type": "platform"
},
"Microsoft.ApplicationInsights.AspNetCore": "1.0.0",
"Microsoft.AspNetCore.Mvc": "1.0.1",
"Microsoft.AspNetCore.Routing": "1.0.1",
"Microsoft.AspNetCore.Server.IISIntegration": "1.0.0",
"Microsoft.AspNetCore.Server.Kestrel": "1.0.1",
"Microsoft.Extensions.Configuration.EnvironmentVariables": "1.0.0",
"Microsoft.Extensions.Configuration.FileExtensions": "1.0.0",
"Microsoft.Extensions.Configuration.Json": "1.0.0",
"Microsoft.Extensions.Logging": "1.0.0",
"Microsoft.Extensions.Logging.Console": "1.0.0",
"Microsoft.Extensions.Logging.Debug": "1.0.0",
"Microsoft.Extensions.Options.ConfigurationExtensions": "1.0.0",
"Microsoft.EntityFrameworkCore": "1.0.0",
"MySql.Data.Core": "7.0.4-IR-191",
"MySql.Data.EntityFrameworkCore": "7.0.4-IR-191",
"Microsoft.EntityFrameworkCore.Tools": "1.0.0-preview2-final"
},
"tools": {
"Microsoft.AspNetCore.Server.IISIntegration.Tools": "1.0.0-preview2-final",
"Microsoft.EntityFrameworkCore.Tools": "1.0.0-preview2-final"
},
"frameworks": {
"netcoreapp1.0": {
"imports": [
"dotnet5.6",
"portable-net45+win8"
]
}
},
"buildOptions": {
"emitEntryPoint": true,
"preserveCompilationContext": true
},
"runtimeOptions": {
"configProperties": {
"System.GC.Server": true
}
},
"publishOptions": {
"include": [
"wwwroot",
"**/*.cshtml",
"appsettings.json",
"web.config"
]
},
"scripts": {
"postpublish": [ "dotnet publish-iis --publish-folder %publish:OutputPath% --framework %publish:FullTargetFramework%" ]
}
}
appsettings.json:
{
"ConnectionStrings": {
"SampleConnection": "server=localhost;userid=root;pwd=root;port=3306;database=asptest;sslmode=none;"
},
"Logging": {
"IncludeScopes": false,
"LogLevel": {
"Default": "Debug",
"System": "Information",
"Microsoft": "Information"
}
}
}
在我的startup.cs中:
public void ConfigureServices(IServiceCollection services)
{
// Add framework services.
services.AddApplicationInsightsTelemetry(Configuration);
services.AddDbContext<WebAPIDataContext>(options =>
{
options.UseMySQL("SampleConnection");
});
services.AddMvc();
}
经过这么多设置后,我恢复了所有包并执行了 dotnet ef migrations add initial
,它创建了 Migrations 文件夹(我想这意味着它成功了)。之后,我执行了 dotnet ef database update
,这给了我错误:初始化字符串的格式不符合从索引 0 开始的规范
出了什么问题?
最佳答案
更改您的ConfigureServices方法代码:
services.AddDbContext<WebAPIDataContext>(options =>
options.UseMySQL(Configuration.GetConnectionString("SampleConnection"))
);
Configuration.GetConnectionString("SampleConnection")
返回连接字符串server=localhost;userid=root;pwd=root;port=3306;database=asptest;sslmode=none; 您在 appsettings.json 中设置,- 而
options.UseMySQL("SampleConnection")
会尝试将 SampleConnection 字面解释为连接字符串。
关于asp.net-core - asp.net core/EF-Core mysql更新数据库错误,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/42460997/