WebApi连接数据库

首先在web.config中加上语句连接语句：

<connectionStrings>

<add name="conn" connectionString="user id=sa;Password=123abcd;initial catalog=company;Server=.;Connect Timeout=30;" providerName="System.Data.SqlClient" />

</connectionStrings>

然后再控制器中测试

using Newtonsoft.Json;
using System;
using System.Collections.Generic;
using System.Data;
using System.Data.SqlClient;
using System.Linq;
using System.Net;
using System.Net.Http;
using System.Text;
using System.Web.Http;
using System.Web.Http.Cors;
using WebApplication.Models;
using System.Configuration;
namespace WebApplication.Controllers
{
public class ValuesController : ApiController
{
[EnableCors(origins: "*", headers: "*", methods: "*")]
// GET api/values
public IEnumerable<string> Get()
{
return new string[] { "value1", "value2" };
}

// GET api/values/5
public Object Get(int id)
{
//return "value";
try
{
string connectionString = ConfigurationManager.ConnectionStrings["conn"].ToString();//引用的 using System.Configuration;
SqlConnection conn = new SqlConnection(connectionString);
//打开数据
conn.Open();
string sql = "select * from information where id=@id";
SqlCommand cmd = conn.CreateCommand();
cmd.CommandText = sql;
cmd.Parameters.Add(new SqlParameter("@id", id));
SqlDataAdapter sqlDataAdapter = new SqlDataAdapter(cmd);
DataSet dataSet = new DataSet();
sqlDataAdapter.Fill(dataSet);
return dataSet;
}
catch (Exception ex)
{
return ex;
}
}
// POST api/values
[HttpPost]
public object Post([FromBody] UserModel userModel)
{
try
{
////打开数据
//conn.Open();
//string sql = "INSERT INTO information([idcard],[bianma])VALUES(@idcard,@bianma)";
//SqlCommand cmd = conn.CreateCommand();
//cmd.CommandText = sql;
//cmd.Parameters.Add(new SqlParameter("@idcard", "20181026"));
//cmd.Parameters.Add(new SqlParameter("@bianma", "1026"));
//SqlDataAdapter sqlDataAdapter = new SqlDataAdapter(cmd);
//DataSet dataSet = new DataSet();
//sqlDataAdapter.Fill(dataSet);
//return dataSet;
var strName = String.Format("一个对象，{0},{1}", userModel.bianma,userModel.idcard);
return strName;

}
catch (Exception ex)
{
return false;
}
}

// PUT api/values/5
public void Put(int id, [FromBody]string value)
{
}

// DELETE api/values/5
public void Delete(int id)
{
}
}
}