如何在实体框架6中调用存储过程（代码优先）？

Question

我对Entity Framework 6非常陌生，我想在我的项目中实现存储过程。我有一个存储过程，如下所示：

ALTER PROCEDURE [dbo].[insert_department]
    @Name [varchar](100)
AS
BEGIN
    INSERT [dbo].[Departments]([Name])
    VALUES (@Name)

    DECLARE @DeptId int

    SELECT @DeptId = [DeptId]
    FROM [dbo].[Departments]
    WHERE @@ROWCOUNT > 0 AND [DeptId] = SCOPE_IDENTITY()

    SELECT t0.[DeptId]
    FROM [dbo].[Departments] AS t0
    WHERE @@ROWCOUNT > 0 AND t0.[DeptId] = @DeptId
END

部门班级：

public class Department
{
    public int DepartmentId { get; set; }       
    public string Name { get; set; }
}

modelBuilder 
.Entity<Department>() 
.MapToStoredProcedures(s => 
s.Update(u => u.HasName("modify_department") 
               .Parameter(b => b.Department, "department_id") 
               .Parameter(b => b.Name, "department_name")) 
 .Delete(d => d.HasName("delete_department") 
               .Parameter(b => b.DepartmentId, "department_id")) 
 .Insert(i => i.HasName("insert_department") 
               .Parameter(b => b.Name, "department_name")));

protected void btnSave_Click(object sender, EventArgs e)
{
    string department = txtDepartment.text.trim();

    // here I want to call the stored procedure to insert values
}

我的问题是：如何调用存储过程并向其中传递参数？

Answer 1

我用ExecuteSqlCommand

将您自己的方法（如我的方法）放在DbContext中作为您自己的实例：

public void addmessage(<yourEntity> _msg)
{
    var date = new SqlParameter("@date", _msg.MDate);
    var subject = new SqlParameter("@subject", _msg.MSubject);
    var body = new SqlParameter("@body", _msg.MBody);
    var fid = new SqlParameter("@fid", _msg.FID);
    this.Database.ExecuteSqlCommand("exec messageinsert @Date , @Subject , @Body , @Fid", date,subject,body,fid);
}

因此，您可以在代码中使用如下方法：

[WebMethod] //this method is static and i use web method because i call this method from client side
public static void AddMessage(string Date, string Subject, string Body, string Follower, string Department)
{
    try
    {
        using (DBContext reposit = new DBContext())
        {
            msge <yourEntity> Newmsg = new msge();
            Newmsg.MDate = Date;
            Newmsg.MSubject = Subject.Trim();
            Newmsg.MBody = Body.Trim();
            Newmsg.FID= 5;
            reposit.addmessage(Newmsg);
        }
    }
    catch (Exception)
    {
        throw;
    }
}

这是我的SP：

Create PROCEDURE dbo.MessageInsert

    @Date nchar["size"],
    @Subject nchar["size"],
    @Body nchar["size"],
    @Fid int
AS
    insert into Msg (MDate,MSubject,MBody,FID) values (@Date,@Subject,@Body,@Fid)
    RETURN

希望这对你有帮助。

Answer 2

只需创建一个与存储过程返回的结果具有相同属性名的对象。对于以下存储过程：

    CREATE PROCEDURE [dbo].[GetResultsForCampaign]  
    @ClientId int   
    AS
    BEGIN
    SET NOCOUNT ON;

    SELECT AgeGroup, Gender, Payout
    FROM IntegrationResult
    WHERE ClientId = @ClientId
    END

创建一个如下所示的类：

    public class ResultForCampaign
    {
        public string AgeGroup { get; set; }

        public string Gender { get; set; }

        public decimal Payout { get; set; }
    }

然后通过执行以下操作调用该过程：

    using(var context = new DatabaseContext())
    {
            var clientIdParameter = new SqlParameter("@ClientId", 4);

            var result = context.Database
                .SqlQuery<ResultForCampaign>("GetResultsForCampaign @ClientId", clientIdParameter)
                .ToList();
    }

结果将包含一个ResultFor运动对象的列表。您可以根据需要使用任意多的参数调用SqlQuery。

Answer 3

您可以在DbContext类中调用存储过程，如下所示。

this.Database.SqlQuery<YourEntityType>("storedProcedureName",params);

但是，如果存储过程返回多个结果集作为示例代码，那么您可以在MSDN上看到这篇有用的文章

具有多个结果集的存储过程