我是Entity Framework 6的新手,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
Department
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?
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
public IList<Models.StandardRecipeDetail> GetRequisitionDetailBySearchCriteria(Guid subGroupItemId, Guid groupItemId)
{
var query = this.UnitOfWork.Context.Database.SqlQuery<Models.StandardRecipeDetail>("SP_GetRequisitionDetailBySearchCriteria @SubGroupItemId,@GroupItemId",
new System.Data.SqlClient.SqlParameter("@SubGroupItemId", subGroupItemId),
new System.Data.SqlClient.SqlParameter("@GroupItemId", groupItemId));
return query.ToList();
}
它首先在代码中为我工作。它返回一个具有viewmodel匹配属性的列表(StudentChapterCompletion ViewModel)
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();
更新了上下文
Context是继承DbContext的类的实例,如下所示。
public class ApplicationDbContext : DbContext
{
public DbSet<City> City { get; set; }
}
var Context = new ApplicationDbContext();
Mindless passenger有一个项目,允许使用实体框架从存储过程返回多个结果集。他下面的一个例子......
using (testentities te = new testentities())
{
//-------------------------------------------------------------
// Simple stored proc
//-------------------------------------------------------------
var parms1 = new testone() { inparm = "abcd" };
var results1 = te.CallStoredProc<testone>(te.testoneproc, parms1);
var r1 = results1.ToList<TestOneResultSet>();
}
如果您想将表params传递给存储过程,则必须为表params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();
这是EF(DB优先)在DbContext类中生成的内容:
public ObjectResult<int> Insert_Department(string department)
{
var departmentParameter = new ObjectParameter("department", department);
return ((IObjectContextAdapter)this).ObjectContext.ExecuteFunction<int>("insert_department", departmentParameter);
}
当EDMX创建此时如果您在表选择选项中选择存储过程,则只需使用过程名称调用存储过程...
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.
我发现在Code First方法中调用存储过程并不方便。我更喜欢使用Dapper
以下代码是用Entity Framework
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);
我相信第二段代码更容易理解。
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();
}
没有什么必须做...当你为代码创建dbcontext时,首先在fluent API区域下方初始化命名空间make sp的列表并将它用在你想要的另一个地方。
public partial class JobScheduleSmsEntities : DbContext
{
public JobScheduleSmsEntities()
: base("name=JobScheduleSmsEntities")
{
Database.SetInitializer<JobScheduleSmsEntities>(new CreateDatabaseIfNotExists<JobScheduleSmsEntities>());
}
public virtual DbSet<Customer> Customers { get; set; }
public virtual DbSet<ReachargeDetail> ReachargeDetails { get; set; }
public virtual DbSet<RoleMaster> RoleMasters { get; set; }
protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
//modelBuilder.Types().Configure(t => t.MapToStoredProcedures());
//modelBuilder.Entity<RoleMaster>()
// .HasMany(e => e.Customers)
// .WithRequired(e => e.RoleMaster)
// .HasForeignKey(e => e.RoleID)
// .WillCascadeOnDelete(false);
}
public virtual List<Sp_CustomerDetails02> Sp_CustomerDetails()
{
//return ((IObjectContextAdapter)this).ObjectContext.ExecuteFunction<Sp_CustomerDetails02>("Sp_CustomerDetails");
// this.Database.SqlQuery<Sp_CustomerDetails02>("Sp_CustomerDetails");
using (JobScheduleSmsEntities db = new JobScheduleSmsEntities())
{
return db.Database.SqlQuery<Sp_CustomerDetails02>("Sp_CustomerDetails").ToList();
}
}
}
}
public partial class Sp_CustomerDetails02
{
public long? ID { get; set; }
public string Name { get; set; }
public string CustomerID { get; set; }
public long? CustID { get; set; }
public long? Customer_ID { get; set; }
public decimal? Amount { get; set; }
public DateTime? StartDate { get; set; }
public DateTime? EndDate { get; set; }
public int? CountDay { get; set; }
public int? EndDateCountDay { get; set; }
public DateTime? RenewDate { get; set; }
public bool? IsSMS { get; set; }
public bool? IsActive { get; set; }
public string Contact { get; set; }
}
首先使用MySql和Entity框架代码方法:
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();
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称。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
创建一个类似于的类:
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ResultForCampaign
对象列表。您可以根据需要使用尽可能多的参数调用SqlQuery
。
我用ExecuteSqlCommand
解决了它
把你自己的方法像我一样在DbContext中作为你自己的实例:
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);
}
所以你可以在你的代码隐藏中使用这样的方法:
[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
希望能帮助你
使用您的示例,有两种方法可以实现此目的:
请注意,此代码可以使用或不使用映射。如果关闭实体上的映射,EF将生成insert + select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;
}
}
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。
您正在使用MapToStoredProcedures()
表示您正在将实体映射到存储过程,在执行此操作时,您需要放弃存储过程并正常使用context
这一事实。像这样的东西(写入浏览器所以未经测试)
using(MyContext context = new MyContext())
{
Department department = new Department()
{
Name = txtDepartment.text.trim()
};
context.Set<Department>().Add(department);
}
如果您真正想要做的就是直接调用存储过程,那么使用SqlQuery
您现在还可以使用我创建的约定,该约定允许从EF本地调用存储过程(包括返回多个结果集的存储过程),TVF和标量UDF。
在实体框架6.1发布之前,只有在执行数据库优先时,才能在EF中使用存储功能(即表值函数和存储过程)。有一些解决方法可以在Code First应用程序中调用商店功能,但您仍然无法在Linq查询中使用TVF,这是最大的限制之一。在EF 6.1中,映射API被公开(随着一些额外的调整)使得在Code First应用程序中使用商店功能成为可能。
在过去的两周里,我非常努力地推出了这个约定的beta版本,它允许在使用Code First方法和Entity Framework 6.1.1的应用程序中使用存储函数(即存储过程,表值函数等)(或更新)。我对此版本中包含的修复程序和新功能非常满意。
object[] xparams = {
new SqlParameter("@ParametterWithNummvalue", DBNull.Value),
new SqlParameter("@In_Parameter", "Value"),
new SqlParameter("@Out_Parameter", SqlDbType.Int) {Direction = ParameterDirection.Output}};
YourDbContext.Database.ExecuteSqlCommand("exec StoreProcedure_Name @ParametterWithNummvalue, @In_Parameter, @Out_Parameter", xparams);
var ReturnValue = ((SqlParameter)params[2]).Value;
这通过在传入参数时从存储过程中拉回数据来为我工作。
var param = new SqlParameter("@datetime", combinedTime);
var result =
_db.Database.SqlQuery<QAList>("dbo.GetQAListByDateTime @datetime", param).ToList();
_db
是dbContext
看一下这个链接,它显示了EF 6与存储过程的映射如何进行插入,更新和删除:http://msdn.microsoft.com/en-us/data/dn468673
加成
以下是从Code First调用存储过程的一个很好的示例:
假设您必须使用单个参数执行存储过程,并且存储过程返回一组与实体状态匹配的数据,因此我们将具有:
var countryIso = "AR"; //Argentina
var statesFromArgentina = context.Countries.SqlQuery(
"dbo.GetStatesFromCountry @p0", countryIso
);
现在假设我们想要使用两个参数执行另一个存储过程:
var countryIso = "AR"; //Argentina
var stateIso = "RN"; //Río Negro
var citiesFromRioNegro = context.States.SqlQuery(
"dbo.GetCitiesFromState @p0, @p1", countryIso, stateIso
);
请注意,我们正在使用基于索引的参数命名。这是因为实体框架将这些参数作为DbParameter对象包装起来,以避免任何SQL注入问题。
希望这个例子有帮助!