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

如果你想把表参数传递到存储过程中,你必须为你的表参数设置TypeName属性。

SqlParameter codesParam = new SqlParameter(CODES_PARAM, SqlDbType.Structured);
            SqlParameter factoriesParam = new SqlParameter(FACTORIES_PARAM, SqlDbType.Structured);

            codesParam.Value = tbCodes;
            codesParam.TypeName = "[dbo].[MES_CodesType]";
            factoriesParam.Value = tbfactories;
            factoriesParam.TypeName = "[dbo].[MES_FactoriesType]";


            var list = _context.Database.SqlQuery<MESGoodsRemain>($"{SP_NAME} {CODES_PARAM}, {FACTORIES_PARAM}"
                , new SqlParameter[] {
                   codesParam,
                   factoriesParam
                }
                ).ToList();

其他回答

您正在使用MapToStoredProcedures(),这表明您正在将实体映射到存储过程,在执行此操作时,您需要放弃存在存储过程的事实,并正常使用上下文。 像这样(写入浏览器,所以没有测试)

using(MyContext context = new MyContext())
{
    Department department = new Department()
    {
        Name = txtDepartment.text.trim()
    };
    context.Set<Department>().Add(department);
}

如果你真正想做的只是直接调用存储过程,那么使用SqlQuery

我发现以代码优先的方式调用存储过程并不方便。

我更喜欢用Dapper代替。

下面的代码是用实体框架编写的:

var clientIdParameter = new SqlParameter("@ClientId", 4);

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

以下代码是用Dapper编写的:

return Database.Connection.Query<ResultForCampaign>(
            "GetResultsForCampaign ",
            new
            {
                ClientId = 4
            },
            commandType: CommandType.StoredProcedure);
    

我认为第二段代码更容易理解。

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();

您可以在DbContext类中调用存储过程,如下所示。

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

但是如果您的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

当EDMX创建时,如果你在表选择选项中选择存储过程,那么只需使用过程名调用存储过程…

var num1 = 1; 
var num2 = 2; 

var result = context.proc_name(num1,num2).tolist();// list or single you get here.. using same thing you can call insert,update or delete procedured.