有没有办法用 Dapper 调用存储过程？

Question

Dapper Micro ORMstackoverflow.com 的结果给我留下了深刻的印象。我正在为我的新项目考虑它，但我担心有时我的项目需要存储过程并且我在网上搜索了很多但没有找到任何存储过程。那么有什么方法可以让 Dapper 使用存储过程？

如果可能，请告诉我，否则我必须以我的方式扩展它。

Answer 1

在简单的情况下你可以这样做：

var user = cnn.Query<User>("spGetUser", new {Id = 1}, 
        commandType: CommandType.StoredProcedure).First();

如果你想要更花哨的东西，你可以这样做：

 var p = new DynamicParameters();
 p.Add("@a", 11);
 p.Add("@b", dbType: DbType.Int32, direction: ParameterDirection.Output);
 p.Add("@c", dbType: DbType.Int32, direction: ParameterDirection.ReturnValue);

 cnn.Execute("spMagicProc", p, commandType: CommandType.StoredProcedure); 

 int b = p.Get<int>("@b");
 int c = p.Get<int>("@c"); 

此外，您可以批量使用 exec，但这更笨重。

Answer 2

我认为答案取决于您需要使用存储过程的哪些功能。

可以使用Query 运行返回结果集的存储过程；不返回结果集的存储过程可以使用Execute 运行——在这两种情况下（使用EXEC <procname>）作为SQL 命令（必要时加上输入参数）。有关详细信息，请参阅documentation。

截至修订版2d128ccdc9a2 似乎没有对OUTPUT 参数的原生支持；你可以添加这个，或者构造一个更复杂的 Query 命令来声明 TSQL 变量，执行 SP，将 OUTPUT 参数收集到局部变量中，最后在结果集中返回它们：

DECLARE @output int

EXEC <some stored proc> @i = @output OUTPUT

SELECT @output AS output1

Answer 3

这是从 Store 过程中获取值返回的代码

存储过程：

alter proc [dbo].[UserlogincheckMVC]    
@username nvarchar(max),    
@password nvarchar(max)
as    
begin    
    if exists(select Username from Adminlogin where Username =@username and Password=@password)    
        begin        
            return 1  
        end    
    else    
        begin     
            return 0  
        end    
end 

代码：

var parameters = new DynamicParameters();
string pass = EncrytDecry.Encrypt(objUL.Password);
conx.Open();
parameters.Add("@username", objUL.Username);
parameters.Add("@password", pass);
parameters.Add("@RESULT", dbType: DbType.Int32, direction: ParameterDirection.ReturnValue);
var RS = conx.Execute("UserlogincheckMVC", parameters, null, null, commandType: CommandType.StoredProcedure);
int result = parameters.Get<int>("@RESULT");

Answer 4

同上，更详细一点

使用 .Net Core

控制器

public class TestController : Controller
{
    private string connectionString;
  
    public IDbConnection Connection
    {
        get { return new SqlConnection(connectionString); }
    }

    public TestController()
    {
        connectionString = @"Data Source=OCIUZWORKSPC;Initial Catalog=SocialStoriesDB;Integrated Security=True";
    }

    public JsonResult GetEventCategory(string q)
    {
        using (IDbConnection dbConnection = Connection)
        {
            var categories = dbConnection.Query<ResultTokenInput>("GetEventCategories", new { keyword = q },
    commandType: CommandType.StoredProcedure).FirstOrDefault();

            return Json(categories);
        }
    }

    public class ResultTokenInput
    {
        public int ID { get; set; }
        public string name { get; set; }            
    }
}

存储过程（父子关系）

create PROCEDURE GetEventCategories
@keyword as nvarchar(100)
AS
    BEGIN

    WITH CTE(Id, Name, IdHierarchy,parentId) AS
    (
      SELECT 
        e.EventCategoryID as Id, cast(e.Title as varchar(max)) as Name,
        cast(cast(e.EventCategoryID as char(5)) as varchar(max)) IdHierarchy,ParentID
      FROM 
        EventCategory e  where e.Title like '%'+@keyword+'%'
     -- WHERE 
      --  parentid = @parentid

      UNION ALL

      SELECT 
        p.EventCategoryID as Id, cast(p.Title + '>>' + c.name as varchar(max)) as Name,
        c.IdHierarchy + cast(p.EventCategoryID as char(5)),p.ParentID
      FROM 
        EventCategory p 
      JOIN  CTE c ON c.Id = p.parentid

        where p.Title like '%'+@keyword+'%'
    )
    SELECT 
      * 
    FROM 
      CTE
    ORDER BY 
      IdHierarchy

案例参考

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Http;
using SocialStoriesCore.Data;
using Dapper;
using System.Data;
using System.Data.SqlClient;

Answer 5

多返回多参数

string ConnectionString = CommonFunctions.GetConnectionString();
using (IDbConnection conn = new SqlConnection(ConnectionString))
{
    // single result
    var results = conn.Query(sql: "ProductSearch", 
        param: new { CategoryID = 1, SubCategoryID="", PageNumber=1 }, 
        commandType: CommandType.StoredProcedure);

    // multiple result
    var reader = conn.QueryMultiple("ProductSearch", 
        param: new { CategoryID = 1, SubCategoryID = "", PageNumber = 1 }, 
        commandType: CommandType.StoredProcedure); 

    var userdetails = reader.Read<dynamic>().ToList(); // instead of dynamic, you can use your objects
    var salarydetails = reader.Read<dynamic>().ToList();
}

public static string GetConnectionString()
{
    // Put the name the Sqlconnection from WebConfig..
    return ConfigurationManager.ConnectionStrings["DefaultConnection"].ConnectionString;
}

Answer 6

public static IEnumerable<T> ExecuteProcedure<T>(this SqlConnection connection,
    string storedProcedure, object parameters = null,
    int commandTimeout = 180) 
    {
        try
        {
            if (connection.State != ConnectionState.Open)
            {
                connection.Close();
                connection.Open();
            }

            if (parameters != null)
            {
                return connection.Query<T>(storedProcedure, parameters,
                    commandType: CommandType.StoredProcedure, commandTimeout: commandTimeout);
            }
            else
            {
                return connection.Query<T>(storedProcedure,
                    commandType: CommandType.StoredProcedure, commandTimeout: commandTimeout);
            }
        }
        catch (Exception ex)
        {
            connection.Close();
            throw ex;
        }
        finally
        {
            connection.Close();
        }

    }
}

var data = db.Connect.ExecuteProcedure<PictureModel>("GetPagePicturesById",
    new
    {
        PageId = pageId,
        LangId = languageId,
        PictureTypeId = pictureTypeId
    }).ToList();