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如何使用 MySQL EntityFramework 组件处理 MYSQL…

2018-06-18 00:03:56来源：未知阅读 ()

MySQL Database on Azure 是 Azure 平台上推出的 MySQL 云数据库服务，通过全面兼容 MySQL 协议，为用户提供了一个全托管的性能稳定、可快速部署、高可用、高安全性的数据库服务。客户可以使用常见的支持 MySQL 的平台与技术进行开发与集成。本文演示了如何使用 MySQL EntityFramework 组件对 MySQL PaaS DB 进行操作。

系统环境 / 应用程序信息

ASP.NET 2005 Core / MYSQL EntityFrameWork Core

详细代码

在 VS 2015 Net Core 的环境中，安装 EntityFrameWork Core 组件，代码和测试后结果如下：

其中 Data1Context.cs 文件为：

using Microsoft.EntityFrameworkCore;
using MySQL.Data.EntityFrameworkCore.Extensions;

namespace ConsoleApp1
{
    /// <summary>
    /// The entity framework context with a data1 DbSet
    /// </summary>
    public class Data1Context : DbContext
    {
        public Data1Context(DbContextOptions<Data1Context> options)
        : base(options)
        { }

        public DbSet<Data1> Data1 { get; set; }
    }

    /// <summary>
    /// Factory class for EmployeesContext
    /// </summary>
    public static class Data1ContextFactory
    {
        public static Data1Context Create(string connectionString)
        {
            var optionsBuilder = new DbContextOptionsBuilder<Data1Context>();
            optionsBuilder.UseMySQL(connectionString);

            //Ensure database creation
            var context = new Data1Context(optionsBuilder.Options);
            context.Database.EnsureCreated();

            return context;
        }
    }

    /// <summary>
    /// A basic class for an Employee
    /// </summary>
    public class Data1
    {
        public int Id { get; set; }
        public string Name1 { get; set; }
    }

}

Program.cs 文件为：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.Extensions.Configuration;

namespace ConsoleApp1
{
    public class Program
    {
        public static void Main(string[] args)
        {
            var builder = new ConfigurationBuilder().AddJsonFile("appsettings.json", optional: false, reloadOnChange: true);

            var configuration = builder.Build();

            string connectionString = configuration.GetConnectionString("SampleConnection");

            // Create an employee instance and save the entity to the database
            var entry = new Data1() { Id = 3, Name1 = "XingBing" };

            using (var context = Data1ContextFactory.Create(connectionString))
            {
                context.Add(entry);
                context.SaveChanges();
            }

            Console.WriteLine($"Data1 was saved in the database with id: {entry.Id}");
            Console.ReadKey();
        }
    }
}

appsettings.json 文件为：

{
    "ConnectionStrings": {
        "SampleConnection": "server=XXXXXX.mysqldb.chinacloudapi.cn;userid=XXXXXX%YYYYYY;pwd=XXXXXXXXX;port=3306;database=xyudb;sslmode=none;"
    }
}

project.json 文件为：

{
    "version": "1.0.0-*",
    "buildOptions": {
        "debugType": "portable",
        "emitEntryPoint": true,
        "copyToOutput": {
        "include": "appsettings.json"
        }
    },
    "dependencies": {
        "Microsoft.Extensions.Configuration": "1.0.0",
        "Microsoft.Extensions.Configuration.Json": "1.0.0",
        "Microsoft.EntityFrameworkCore": "1.0.0",
        "MySql.Data.Core": "7.0.4-IR-191",
        "MySql.Data.EntityFrameworkCore": "7.0.4-IR-191"
    },
    "frameworks": {
        "netcoreapp1.0": {
            "dependencies": {
                "Microsoft.NETCore.App": {
                "type": "platform",
                "version": "1.0.0"
                }
            },
            "imports": [
                "dnxcore50",
                "portable-net452+win81"
            ]
        }
    }
}