轻量ORM-SqlRepoEx （七）AspNetCore应用

ORM-SqlRepoEx 是 .Net平台下兼容.NET Standard 2.0，一个实现以Lambda表达式转转换标准SQL语句，使用强类型操作数据的轻量级ORM工具，在减少魔法字串同时，通过灵活的Lambda表达式组合，实现业务数据查询的多样性。

ORM-SqlRepoEx 也是一个极易使用的工具，通过在AspNetCore中的应用可以展示。

本案例源码在：

https://github.com/AzThinker/SqlRepoEx2.0DemoForAspCore

或

https://gitee.com/azthinker/SqlRepoEx2.0DemoForAspCore

源码部分代码是使用代码工具生成

https://github.com/AzThinker/CodeToolSolution

1、新建一个AspNetCore项目

2、通过Nuget下载SqlRepoEx库、由于本例中是AspNetCore.Mvc项目，案例中使用的是SQL Server的Northwind数据库，所以选择下载

SqlRepoEx.MsSql.ServiceCollection

3、在Startup.cs文件的public void ConfigureServices(IServiceCollection services)中添加

string ConnectionString = "Data Source=(Local);Initial Catalog=Northwind;User ID=test;Password=test";

services.AddSimpleSqlRepo(ConnectionString);

4、增加一个简单类AzCustomers，其属性来源于 Customers 表。为使SqlRepoEx 精准访问，增加特性标识  [TableName("Customers")] 。

 using System;
 using SqlRepoEx.Core.CustomAttribute;

 // 客户 业务类
 namespace DemoTools.BLL.DemoNorthwind
 {
     [TableName("Customers")]
     /// <summary>
     /// 客户 业务类
     /// </summary>
     public sealed class AzCustomers
     {
         public string CustomerID { get; set; }

         public string CompanyName { get; set; }

         public string ContactName { get; set; }

         public string ContactTitle { get; set; }

         public string Address { get; set; }

         public string City { get; set; }

         public string Region { get; set; }

         public string PostalCode { get; set; }

         public string Country { get; set; }

         public string Phone { get; set; }

         public string Fax { get; set; }

     }
 }

5、增加一人简单的列表类 AzCustomersList，其中实现了IPagedList接口，此接口是Webdiyer.WebControls.AspNetCore分页控件中定义，由于Webdiyer.WebControls.AspNetCore的源码不支持core2.1，所以重新编译，并将源码加工程中。

using System;
using System.Collections.Generic;
using Webdiyer.WebControls.AspNetCore;

//客户列表类
namespace DemoTools.BLL.DemoNorthwind
{
    /// <summary>
    /// 客户  列表类
    /// </summary>
    public class AzCustomersList : List<AzCustomers>, IPagedList
    {
        public string DisplayDescription = "客户";
        public int PageSize { get; set; }
        public int TotalItemCount { get; set; }
        public int CurrentPageIndex { get; set; }

        public static AzCustomersList GetModelList((IEnumerable<AzCustomers> QueryResult, int PageCount) queryresult, int pageSize, int currentPageIndex)
        {
            AzCustomersList models = new AzCustomersList();
            models.AddRange(queryresult.QueryResult);
            models.TotalItemCount = queryresult.PageCount;
            models.PageSize = pageSize;
            models.CurrentPageIndex = currentPageIndex;
            return models;
        }
    }
}

6、增加一个控制器并在控制器的构造方法 AzCustomersController(IRepositoryFactory repositoryFactory)，IRepositoryFactory是SqlRepoEx 工厂类的接口，由于前面（第2条中）已经注册了SqlRepoEx 所需的依赖，此处仅需在构造中加入此接口即可。

 using System.Linq;
 using DemoTools.BLL.DemoNorthwind;
 using Microsoft.AspNetCore.Authorization;
 using Microsoft.AspNetCore.Mvc;
 using SqlRepoEx.Abstractions;

 // 客户 控制器
 namespace DemoTools.WebUI.DemoNorthwind.Controllers
 {
     /// <summary>
     /// 客户
     /// </summary>
     public class AzCustomersController : Controller
     {
         IRepositoryFactory repositoryFactory;
         IRepository<AzCustomers> repository;
         public AzCustomersController(IRepositoryFactory repositoryFactory)
         {
             this.repositoryFactory = repositoryFactory;
             this.repository = repositoryFactory.Create<AzCustomers>();
         }

         /// <summary>
         /// 返回 客户 列表
         /// 异步调用数据,其异步部分明细View没有Controller只有View
         /// </summary>
         public IActionResult Index(int pageindex = )
         {
             var queryresult = repository.Query()
              .Select(s => s.CustomerID
                         , s => s.CompanyName
                         , s => s.ContactName
                         , s => s.ContactTitle
                         , s => s.Address
                         , s => s.City
                         , s => s.Region
                         , s => s.PostalCode
                         , s => s.Country
                         , s => s.Phone
                         , s => s.Fax
                 ).OrderBy(o => o.CustomerID).Page(, pageindex).PageGo();
             var model = AzCustomersList.GetModelList(queryresult, , pageindex);
             string xrh = Request.Headers["X-Requested-With"];
             if (!string.IsNullOrEmpty(xrh) && xrh.Equals("XMLHttpRequest", System.StringComparison.OrdinalIgnoreCase))
             {
                 return PartialView("DetailsPage", model);
             }
             return View(model);
         }

         /// <summary>
         /// 增加客户
         /// </summary>
         public ActionResult Create()
         {
             var model = new AzCustomers();
             return View(model);
         }

         /// <summary>
         /// 增加保存客户
         /// </summary>
         [HttpPost, ValidateAntiForgeryToken]
         [ActionName("Create")]
         public IActionResult CreatePost(AzCustomers model)
         {
             if (ModelState.IsValid)
             {
                 repository.Insert().With(s => s.CustomerID, model.CustomerID)
                          .With(s => s.CompanyName, model.CompanyName)
                          .With(s => s.ContactName, model.ContactName)
                          .With(s => s.ContactTitle, model.ContactTitle)
                          .With(s => s.Address, model.Address)
                          .With(s => s.City, model.City)
                          .With(s => s.Region, model.Region)
                          .With(s => s.PostalCode, model.PostalCode)
                          .With(s => s.Country, model.Country)
                          .With(s => s.Phone, model.Phone)
                          .With(s => s.Fax, model.Fax)
                  .Go();//按增加保存
                 return RedirectToAction("Index");
             }
             return View(model);
         }

         /// <summary>
         /// 编辑客户
         /// </summary>
         public IActionResult Edit(string Id)
         {
             var model = repository.Query()
                     .Select(s => s.CustomerID
                             , s => s.CompanyName
                             , s => s.ContactName
                             , s => s.ContactTitle
                             , s => s.Address
                             , s => s.City
                             , s => s.Region
                             , s => s.PostalCode
                             , s => s.Country
                             , s => s.Phone
                             , s => s.Fax
                      ).Where(s => s.CustomerID == Id).Go().FirstOrDefault();
             return View(model);
         }

         /// <summary>
         ///  保存编辑的客户
         /// </summary>
         [HttpPost, ValidateAntiForgeryToken]
         [ActionName("Edit")]
         public IActionResult EditPost(AzCustomers model)
         {
             if (ModelState.IsValid)
             {
                 repository.Update().Set(s => s.CustomerID, model.CustomerID)
                         .Set(s => s.CompanyName, model.CompanyName)
                         .Set(s => s.ContactName, model.ContactName)
                         .Set(s => s.ContactTitle, model.ContactTitle)
                         .Set(s => s.Address, model.Address)
                         .Set(s => s.City, model.City)
                         .Set(s => s.Region, model.Region)
                         .Set(s => s.PostalCode, model.PostalCode)
                         .Set(s => s.Country, model.Country)
                         .Set(s => s.Phone, model.Phone)
                         .Set(s => s.Fax, model.Fax)
             .Go();//按增加保存
                 return RedirectToAction("Index");
             }
             return View(model);
         }

         /// <summary>
         /// 显示客户单个记录
         /// </summary>
         public IActionResult Details(string Id)
         {
             var model = repository.Query()
                     .Select(s => s.CustomerID
                             , s => s.CompanyName
                             , s => s.ContactName
                             , s => s.ContactTitle
                             , s => s.Address
                             , s => s.City
                             , s => s.Region
                             , s => s.PostalCode
                             , s => s.Country
                             , s => s.Phone
                             , s => s.Fax
                      ).Where(s => s.CustomerID == Id).Go().FirstOrDefault();
             return View(model);
         }

         /// <summary>
         /// 独立页面删除客户
         /// </summary>
         public ActionResult Delete(string Id)
         {
             var model = repository.Query()
                   .Select(s => s.CustomerID
                           , s => s.CompanyName
                           , s => s.ContactName
                           , s => s.ContactTitle
                           , s => s.Address
                           , s => s.City
                           , s => s.Region
                           , s => s.PostalCode
                           , s => s.Country
                           , s => s.Phone
                           , s => s.Fax
                    ).Where(s => s.CustomerID == Id).Go().FirstOrDefault();
             return View(model);
         }

         /// <summary>
         /// 独立页面删除客户
         /// </summary>
         [HttpPost, ActionName("Delete")]
         public IActionResult DeleteConfirmed(AzCustomers model)
         {
             repository.Delete().Where(c => c.CustomerID == model.CustomerID).Go();
             return RedirectToAction("Index");
         }

     }
 }

7、View的实现和其他代码参见上面给出的地址中的源码。

总结：从上面看出，对特SqlRepoEx 所需要特定的操作，仅在第2、第3、第6中是必需的

（1）、引用SqlRepoEx.MsSql.ServiceCollection

（2）、 services.AddSimpleSqlRepo(ConnectionString);

（3）、 AzCustomersController(IRepositoryFactory repositoryFactory)

（4）、this.repository = repositoryFactory.Create<AzCustomers>();

然后就可以轻松的通过SqlRepoEx 访问数据库了。