asp.net web api与Mysql数据库

Question

我有PHP的背景，并在尝试ASP.NET webAPI时遇到问题。

我有一个MySQL数据库和一个包含一些文件信息的表。 现在我想创建一个“SELECT * FROM Files”并以XML格式查看结果。

如何呈现返回的查询结果？

这是我目前的代码，

该模型：

namespace ProductsApp.Models
{
    public class File
    {
        public int Id {get; set;}
        public string Text {get; set;}
    }
}

控制者：

public IEnumerable<File> Get()
{
    try
    {
        command = conn.CreateCommand();
        command.CommandText = "SELECT * FROM Files";
        conn.Open();

        MySqlDataReader reader = command.ExecuteReader();
        while (reader.Read())
        {
            //How to output the rows ????
        }
    }
    catch (Exception ex)
    {
        Console.WriteLine(ex.Message);
    }

    return null; // return the list
}

Answer 1

对文件表做一些假设，这就是获取数据的方式

public IEnumerable<File> Get()
{
    List<File> list = new List<File>();
    try
    {
        command = conn.CreateCommand();
        command.CommandText = "SELECT * FROM Files";
        conn.Open();

        using(MySqlDataReader reader = command.ExecuteReader())
        {
            while (reader.Read())
            {
                //How to output the rows ????
                int id = (int) reader["Id"];//Assuming column name is 'Id' and value if typeof(int)
                string text = (string) reader["Text"];//Assuming column name is `Text` and typeof(string)
                var file = new File {Id = id, Text = text};
                list.Add(file);
            }
        }
    }
    catch (Exception ex)
    {
        Console.WriteLine(ex.Message);
    }

    return list; // return the list
}

至于xml是需要在请求上允许的格式设置。

一旦发出调用的客户端请求text/xml作为内容类型，则给定WebApi的默认设置，然后将结果解析为xml并返回给客户端。

如果您想强制响应始终为xml，那么您需要对响应进行一些更改。 一种方法是在返回结果之前设置Content-Type标头。

Response.Content.Headers.ContentType = MediaTypeHeaderValue.Parse("text/xml;charset=utf-8");

还有其他方法可以做到这一点，有很多答案可以告诉你。

Answer 2

Webconfig：

     public static MySqlConnection conn()
    {
        string conn_string = "server=localhost;port=3306;database=testmvc;username=root;password=root;";


        MySqlConnection conn = new MySqlConnection(conn_string);

        return conn;
    }

控制器：

    public MySqlConnection con = WebApiConfig.conn();

    public IHttpActionResult GetAllProduct()
    {
        IList<product> pro = null;

        try
        {
            con.Open();
            MySqlCommand cmd = new MySqlCommand("select * from product", con);

            cmd.CommandType = CommandType.Text;

            MySqlDataAdapter da = new MySqlDataAdapter(cmd);
            DataSet ds = new DataSet();
            da.Fill(ds);

            pro = ds.Tables[0].AsEnumerable().Select(dataRow => new product { Pname = dataRow.Field<string>("pname"), Pid = dataRow.Field<int>("pid"), Pprice = dataRow.Field<decimal>("pprice") }).ToList();

        }
        finally
        {
            con.Close();
        }


        if (pro.Count == 0)
        {
            return NotFound();
        }

        return Ok(pro);
    }

    public IHttpActionResult PostNewProduct(product pro)
    {
        try
        {
            con.Open();

            MySqlCommand cmd = new MySqlCommand();

            cmd.Connection = con;
            cmd.CommandText = "SELECT MAX(pid) from product";

            cmd.CommandType = CommandType.Text;

            int maxid = Convert.ToInt16(cmd.ExecuteScalar().ToString())+1;


            cmd.CommandText = "insert into product values(" + maxid + ",'" + pro.Pname + "'," + pro.Pprice + ")";

            cmd.ExecuteNonQuery();

        }
        finally
        {
            con.Close();
        }

        return Ok();
    }

    public IHttpActionResult PutOldProduct(product pro)
    {

        string sql = "update product set pname='" + pro.Pname + "',pprice=" + pro.Pprice + " where pid=" + pro.Pid + "";
        try
        {
            con.Open();
            MySqlCommand cmd = new MySqlCommand(sql, con);

            cmd.CommandType = CommandType.Text;

            cmd.ExecuteNonQuery();

        }
        finally
        {
            con.Close();
        }

        return Ok();
    }

    public IHttpActionResult Delete(int id)
    {
        string sql = "delete from product where pid=" + id + "";
        try
        {
            con.Open();
            MySqlCommand cmd = new MySqlCommand(sql, con);

            cmd.CommandType = CommandType.Text;

            cmd.ExecuteNonQuery();

        }
        finally
        {
            con.Close();
        }

        return Ok();
    }