今天分享一个例子,是传递参数至Web API来获取数据的。而且数据是存储在SQL中。数表结构是昨晚帮助网友解解决问题列举的:
CREATE TABLE [dbo].[TA]( [Aid] NVARCHAR(20), [Avalue] NVARCHAR(30))GOINSERT INTO [dbo].[TA] VALUES('A1','A1value')GOCREATE TABLE [dbo].[TC]( [Cid] NVARCHAR(20), [Cvalue] NVARCHAR(30))GOINSERT INTO [dbo].[TC] VALUES('C1','C1value'),('C2','C2value'),('C3','C3value')GOCREATE TABLE [dbo].[TB]( [Bid] NVARCHAR(20), [Aid] NVARCHAR(20), [Cid] NVARCHAR(20) )GOINSERT INTO [dbo].[TB] VALUES ('B1','A1','C1'),('B2','A1','C2'),('B3','A1','C3')GO
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还缺少一个存储过程:
CREATE PROCEDURE [dbo].[usp_Cq_SelectByTaKey]( @Cid NVARCHAR(20))ASSELECT a.[Aid],[Avalue],c.[Cid],[Cvalue] FROM [dbo].[TB] AS bRIGHT JOIN [dbo].[TC] AS c ON (b.[Cid] = c.[Cid])RIGHT JOIN [dbo].[TA] AS a ON (b.[Aid] = a.[Aid])WHERE c.[Cid] = @CidGO
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数据库方面准备完毕,接下来是创建model:
using System;using System.Collections.Generic;using System.Linq;using System.Web;namespace Insus.NET.Models{ public class Cq { private string _Aid; public string Aid { get { return _Aid; } set { _Aid = value; } } private string _Avalue; public string Avalue { get { return _Avalue; } set { _Avalue = value; } } private string _Cid; public string Cid { get { return _Cid; } set { _Cid = value; } } private string _Cvalue; public string Cvalue { get { return _Cvalue; } set { _Cvalue = value; } } }}
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模型与你的存储过程所SELECT的字段基本上匹配即可。
现在我们要写一个实体,是从程序中获取SQL的数据方法:
public IEnumerable<Cq> QueryResult(Cq cq) { sp.ConnectionString = DB.ConnectionString; sp.Parameters = new List<Parameter>() { new Parameter("@Cid", SqlDbType.NVarChar,-1,cq.Cid) }; sp.ProcedureName = "usp_Cq_SelectByTaKey"; DataTable dt = sp.ExecuteDataSet().Tables[0]; return dt.ToList<Cq>(); }
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下面是本篇的重点,创建Web API:
using System;using System.Collections.Generic;using System.Linq;using System.Net;using System.Net.Http;using System.Web.Http;using Insus.NET.Models;using Insus.NET.Entities;namespace Insus.NET.Apis{ public class CqApiController : ApiController { [Route("api/CqApi/GetSearchResult")] [HttpPost] public IEnumerable<Cq> GetSearchResult(Cq cq) { DataEntity de = new DataEntity(); return de.QueryResult(cq); } }}
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最后我们再实现在前端网页去引用此Web API:
html是这样子的,放置一个文本框,让用户输入参数。一个铵钮,让用户请求或查询数据库。还有把结果呈现在一个tabel中:
<div ng-app="CqApp" ng-controller="CqCtrl"> <input id="Text1" type="text" ng-model="Cid"/> <input id="Button1" type="button" value="button" ng-click="QuerySearch();"/> <table cellpadding="0" cellspacing="0"> <tr> <th>Aid</th> <th>Avalue</th> <th>Cid</th> <th>Cvalue</th> </tr> <tbody ng-repeat="c in Cqs"> <tr> <td>{{c.Aid}}</td> <td>{{c.Avalue}}</td> <td>{{c.Cid}}</td> <td>{{c.Cvalue}}</td> </tr> </tbody> </table> </div>
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angularjs代码:
var oApp = angular.module('CqApp', []) oApp.controller('CqCtrl', function ($scope, $http) { $scope.QuerySearch = function () { var obj = {}; obj.Cid = $scope.Cid; $http({ method: 'POST', url: '/api/CqApi/GetSearchResult', dataType: 'json', headers: { 'Content-Type': 'application/json; charset=utf-8' }, data: JSON.stringify(obj), }).then(function (response) { $scope.Cqs = response.data; }); }; });
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演示: