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?
object[] xparams = {
new SqlParameter("@ParameterWithNumvalue", DBNull.Value),
new SqlParameter("@In_Parameter", "Value"),
new SqlParameter("@Out_Parameter", SqlDbType.Int) {Direction = ParameterDirection.Output}};
YourDbContext.Database.ExecuteSqlCommand("exec StoredProcedure_Name @ParameterWithNumvalue, @In_Parameter, @Out_Parameter", xparams);
var ReturnValue = ((SqlParameter)params[2]).Value;
它为我工作在代码第一。它返回一个匹配视图模型属性的列表(StudentChapterCompletionViewModel)
var studentIdParameter = new SqlParameter
{
ParameterName = "studentId",
Direction = ParameterDirection.Input,
SqlDbType = SqlDbType.BigInt,
Value = studentId
};
var results = Context.Database.SqlQuery<StudentChapterCompletionViewModel>(
"exec dbo.sp_StudentComplettion @studentId",
studentIdParameter
).ToList();
已更新
Context是继承DbContext类的实例，如下所示。
public class ApplicationDbContext : DbContext
{
public DbSet<City> City { get; set; }
}
var Context = new ApplicationDbContext();
在MYsql中创建Procedure。
delimiter //
create procedure SP_Dasboarddata(fromdate date, todate date)
begin
select count(Id) as count,date,status,sum(amount) as amount from
details
where (Emidate between fromdate and todate)
group by date ,status;
END;
//
创建包含存储过程返回结果集值的类
[Table("SP_reslutclass")]
public class SP_reslutclass
{
[Key]
public int emicount { get; set; }
public DateTime Emidate { get; set; }
public int ? Emistatus { get; set; }
public int emiamount { get; set; }
}
在Dbcontext中添加Class
public class ABCDbContext:DbContext
{
public ABCDbContext(DbContextOptions<ABCDbContext> options)
: base(options)
{
}
public DbSet<SP_reslutclass> SP_reslutclass { get; set; }
}
在存储库中调用实体
var counts = _Dbcontext.SP_reslutclass.FromSql("call SP_Dasboarddata
('2019-12-03','2019-12-31')").ToList();
public static string ToSqlParamsString(this IDictionary<string, string> dict)
{
string result = string.Empty;
foreach (var kvp in dict)
{
result += $"@{kvp.Key}='{kvp.Value}',";
}
return result.Trim(',', ' ');
}
public static List<T> RunSproc<T>(string sprocName, IDictionary<string, string> parameters)
{
string command = $"exec {sprocName} {parameters.ToSqlParamsString()}";
return Context.Database.SqlQuery<T>(command).ToList();
}
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。
