如何通过AWS Lambda C#访问MySQL服务器？

有人能使用AWS Lambda和C#.NET内核访问AWS RDS中的MySQL数据库吗

我尝试了nuget的“Pomelo.EntityFrameworkCore.MySql”v1.1，并在控制台应用程序（.NET Core）中进行了测试，然后将其转换为AWS Lambda

我正在运行Visual Studio Professional Update 3和.NET Core 1.0.1-VS 2015工具预览2

我的测试代码很简单…只需在AWS RDS中测试打开MySQL数据库，在控制台应用程序中一切正常，但在移动到Lambda时显示错误“此平台不支持操作。”

有没有办法解决这个问题或者在Lambda C#上的任何工作示例来访问RDS MySQL数据库

下面是我的测试代码

函数.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Amazon.Lambda.Core;
using Amazon.Lambda.Serialization;
using Microsoft.EntityFrameworkCore;

// Assembly attribute to enable the Lambda function's JSON input to be converted into a .NET class.
[assembly: LambdaSerializerAttribute(typeof(Amazon.Lambda.Serialization.Json.JsonSerializer))]

namespace AWSLambda1
{
    public class Function
    {
        /// <summary>
        /// A simple function that takes a string and does a ToUpper
        /// </summary>
        /// <param name="input"></param>
        /// <param name="context"></param>
        /// <returns></returns>
        public string FunctionHandler(ILambdaContext context)
        {
            Console.WriteLine("Lambda starting");
            using (var mySQLcontext = new MyContext())
            {
                // Create database
                mySQLcontext.Database.EnsureCreated();
            }
            return "Lambda stopped";
        }
    }

    public class MyContext : DbContext
    {
        //public DbSet<User> Users { get; set; }

        protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
            => optionsBuilder
                .UseMySql(@"Server=your_dbsvr_host;database=testDB;uid=admin;pwd=password123");
    }
}

Lambda错误响应

{
  "errorType": "PlatformNotSupportedException",
  "errorMessage": "Operation is not supported on this platform.",
  "stackTrace": [
    "at System.Runtime.InteropServices.OSPlatform.get_Windows()",
    "at MySql.Data.Serialization.ConnectionSettings..ctor(MySqlConnectionStringBuilder csb)",
    "at MySql.Data.MySqlClient.MySqlConnection.set_ConnectionString(String value)",
    "at Microsoft.EntityFrameworkCore.Storage.Internal.MySqlRelationalConnection.get_DbConnection()",
    "at Microsoft.EntityFrameworkCore.Storage.Internal.MySqlRelationalConnection.Open()",
    "at Microsoft.EntityFrameworkCore.Storage.Internal.MySqlDatabaseCreator.Exists(Boolean retryOnNotExists)",
    "at Microsoft.EntityFrameworkCore.Storage.RelationalDatabaseCreator.EnsureCreated()",
    "at AWSLambda1.Function.FunctionHandler(ILambdaContext context)",
    "at lambda_method(Closure , Stream , Stream , ContextInfo )"
  ]
}

---

问题是project.json文件中缺少“runtime”规范。这不仅限于运行在Lambda中的.Net Core，而且在所有.Net Core应用程序中都是必需的

语法如下所示：

    "runtimes": {
        "win10-x64": {}
    }

---

此外，下面是Microsoft关于运行时标识符的文档：，其中包含有效运行时的列表。“win10-x64”运行时对于Lambda来说很好，它看起来像是在基础库中运行的，该库于2017年1月修复

将

Pomelo.EntityFrameworkCore.MySql

包更新为1.1.1将引入新版本的MySqlConnector并修复此错误

    "runtimes": {
        "win10-x64": {}
    }