如何在实体框架6中调用存储过程(代码优先)?

我对实体框架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:

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

系类:

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将参数传递给它?

当前回答

首先使用MySql和实体框架代码

public class Vw_EMIcount
{
    public int EmiCount { get; set; }
    public string Satus { get; set; }
}

var result = context.Database.SqlQuery<Vw_EMIcount>("call EMIStatus('2018-3-01' ,'2019-05-30')").ToList();

2019-05-22 09:26:24

其他回答

对我来说，这是通过在传递参数时从存储过程中拉回数据来实现的。

var param = new SqlParameter("@datetime", combinedTime);
var result = 
        _db.Database.SqlQuery<QAList>("dbo.GetQAListByDateTime @datetime", param).ToList();

_db是dbContext

2017-02-16 00:50:46

您所要做的就是创建一个对象，该对象具有与存储过程返回的结果相同的属性名。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

创建一个类，如下所示:

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

        public string Gender { get; set; }

        public decimal Payout { get; set; }
    }

然后调用该过程，执行以下操作:

    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ResultForCampaign对象的列表。您可以根据需要使用任意多的参数调用SqlQuery。

2014-08-21 14:30:11

首先使用MySql和实体框架代码

public class Vw_EMIcount
{
    public int EmiCount { get; set; }
    public string Satus { get; set; }
}

var result = context.Database.SqlQuery<Vw_EMIcount>("call EMIStatus('2018-3-01' ,'2019-05-30')").ToList();

2019-05-22 09:26:24

你可以将参数传递给sp_GetById并在ToList()或FirstOrDefault()中获取结果;

var param  = new SqlParameter("@id", 106);
var result = dbContext
               .Database
               .SqlQuery<Category>("dbo.sp_GetById @id", param)
               .FirstOrDefault();

2019-09-16 12:59:36

用你的例子，这里有两种方法来实现这一点:

方法#1:使用存储过程映射

请注意，这段代码可以使用映射，也可以不使用映射。如果在实体上关闭映射，EF将生成一个插入+选择语句。

protected void btnSave_Click(object sender, EventArgs e)
{
     using (var db = DepartmentContext() )
     {
        var department = new Department();
        
        department.Name = txtDepartment.text.trim();
        
        db.Departments.add(department);
        db.SaveChanges();
        
        // EF will populate department.DepartmentId
        int departmentID = department.DepartmentId;
     }
}

方法#2:直接调用存储过程

protected void btnSave_Click(object sender, EventArgs e)
{
     using (var db = DepartmentContext() )
     {
        var name = new SqlParameter("@name", txtDepartment.text.trim());
        
        //to get this to work, you will need to change your select inside dbo.insert_department to include name in the resultset
        var department = db.Database.SqlQuery<Department>("dbo.insert_department @name", name).SingleOrDefault();

       //alternately, you can invoke SqlQuery on the DbSet itself:
       //var department = db.Departments.SqlQuery("dbo.insert_department @name", name).SingleOrDefault();
        
        int departmentID = department.DepartmentId;
     }
}

我建议使用第一种方法，因为您可以直接使用department对象，而不必创建一堆SqlParameter对象。

2015-11-05 17:11:59

如何在实体框架6中调用存储过程(代码优先)?

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