I am very impressed with the results of Dapper Micro ORM for stackoverflow.com. I am considering it for my new project and but I have one concern about that some times my project requires to have Stored Procedure and I have search a lot on web but not found anything with stored procedure. So is there any way to have Dapper work with a stored procedure?
Please let me know if it is possible otherwise I have to extend it in my way.
In the simple case you can do:
var user = cnn.Query<User>("spGetUser", new {Id = 1},
commandType: CommandType.StoredProcedure).First();
If you want something more fancy, you can do:
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");
Additionally you can use exec in a batch, but that is more clunky.
I think the answer depends on which features of stored procedures you need to use.
Stored procedures returning a result set can be run using Query; stored procedures which don't return a result set can be run using Execute - in both cases (using EXEC <procname>) as the SQL command (plus input parameters as necessary). See the documentation for more details.
As of revision 2d128ccdc9a2 there doesn't appear to be native support for OUTPUT parameters; you could add this, or alternatively construct a more complex Query command which declared TSQL variables, executed the SP collecting OUTPUT parameters into the local variables and finallyreturned them in a result set:
DECLARE @output int
EXEC <some stored proc> @i = @output OUTPUT
SELECT @output AS output1
Here is code for getting value return from Store procedure
Stored procedure:
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
Code:
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");
Same from above, bit more detailed
Using .Net Core
Controller
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; }
}
}
Stored Procedure ( parent child relation )
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
References in case
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;
With multiple return and multi parameter
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;
}
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();
