有没有办法用 Dapper 调用存储过程？

Question

stackoverflow.com 的 Dapper Micro ORM 的结果给我留下了深刻的印象。我正在考虑将其用于我的新项目，但我担心有时我的项目需要存储过程，并且我在网络上进行了很多搜索，但没有找到任何带有存储过程的内容。那么有没有办法让 Dapper 使用存储过程呢？

如果可能的话请告诉我，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();

如果你想要更奇特的东西，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"); 

另外，你可以在批处理中使用 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。

返回结果集的存储过程可以使用Query运行；不返回结果集的存储过程可以使用 Execute 来运行 - 在这两种情况下（使用 EXEC）作为 SQL 命令（加上输入参数作为必要的）。有关更多详细信息，请参阅文档。

截至修订版2d128ccdc9a2似乎没有对 OUTPUT 参数的本机支持；您可以添加它，或者构造一个更复杂的Query命令，该命令声明TSQL变量，执行SP，将OUTPUT参数收集到局部变量中，最后将它们返回到结果集中：

DECLARE @output int

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

SELECT @output AS output1

Answer 3

以下是从存储过程获取值返回的代码

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

与上面相同，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

具有多个返回和多个参数

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);

    var salarydetails = reader.Read<dynamic>().ToList();

    // 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();

Answer 7

这是带有参数的存储过程的代码

    var procedureName = "ShowCompanyForProvidedEmployeeId";
    var parameters = new DynamicParameters();
    parameters.Add("Id", id, DbType.Int32, ParameterDirection.Input);
    using (var connection = _context.CreateConnection())
    {
        var company = await connection.QueryFirstOrDefaultAsync<CompanyModel>
            (procedureName, parameters, commandType: CommandType.StoredProcedure);
        return company;
    }