要专业系统地学习EF前往《你必须掌握的Entity Framework 6.x与Core 2.0》这本书的作者（汪鹏，Jeffcky）的博客：https://www.cnblogs.com/CreateMyself/
前面说到EF中的原始查询，就是写SQL语句执行
那么还有存储过程的调用也是通过那几个方法来的
调用查询数据的存储过程使用：ctx.Database.SqlQuery
调用Insert、Update、Delete操作的存储过程使用：ExceuteSqlCommand()或者ExceuteSqlCommandAsync()
调用存储过程
我们先手动地添加一个存储过程：select * from tb_products
create procedure GetProducts
as
begin
set nocount on;
select * from tb_Products;
set nocount off;
end
go
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紧接着调用它，可以
var res = ctx.Database.SqlQuery<Product>("dbo.GetProducts");
Console.WriteLine(JsonConvert.SerializeObject(res,set));
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然后再创建一个存储过程：select id,name from tb_products
create procedure GetProducts2
as
begin
select id,[name] from tb_Products
end
go
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接收类型的属性数量和返回数据集的字段数量不一致，报错。得自己另外定义类型去接收
var res = ctx.Database.SqlQuery<Product>("dbo.getproducts2");
Console.WriteLine(JsonConvert.SerializeObject(res));
// 未经处理的异常: System.Data.Entity.Core.EntityCommandExecutionException: The data reader is incompatible with the specified 'CodeFirstNamespace.Product'. A member of the type, 'Price', does not have a corresponding column in the data reader with the same name.
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来看看带参数的存储过程，在方法中该怎么写
-- 传递参数，name
create procedure GetProductsByName
(
@name as nvarchar(50)
)
as
begin
select *from tb_Products where [Name] =@name;
end
go
-- 执行
exec GetProductsByName '砖头'
go
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// 一个参数name
var parameter = new SqlParameter("@name","水泥");
var res = ctx.Database.SqlQuery<Product>("dbo.getproductsByName @name",parameter);
Console.WriteLine(JsonConvert.SerializeObject(res));
// [{"Order":null,"Name":"水泥","Price":50.00,"Unit":"袋","FK_Order_Id":"469b82be-8139-4e67-b566-5b2b5f6d838d","Id":"d951e96d-a581-4f87-a567-bedb4c24eca3","AddTime":"2019-01-15T10:28:00.653"}]
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来看看多个参数的存储过程
-- 两个参数，id,price
create procedure GetProducts3
(
@id as nvarchar(36),
@price as decimal(18,2)
)
as
begin
select * from tb_Products where id =@id and Price = @price
end
go
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// 两个参数
var parameterList = new List<SqlParameter>
{
new SqlParameter(){ ParameterName="@id",SqlDbType = System.Data.SqlDbType.NVarChar,Value ="6495f22b-f1ef-4bd2-b81e-c49eaf6e2f21"},
new SqlParameter(){ ParameterName="@price",SqlDbType=System.Data.SqlDbType.Decimal,Value=5}
};
var parameterArr = parameterList.ToArray();
var res = ctx.Database.SqlQuery<Product>("dbo.getproducts3 @id,@price",parameterArr);
Console.WriteLine(JsonConvert.SerializeObject(res));
//[{"Order":null,"Name":"苹果","Price":5.00,"Unit":"斤","FK_Order_Id":"e18757db-1db8-4f7f-b702-79138709b304","Id":"6495f22b-f1ef-4bd2-b81e-c49eaf6e2f21","AddTime":"2019-01-15T10:35:03.36"}]
// 简直没有问题
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上面的都是执行的查询操作，来看看添加操作的存储过程，我们使用ExcuteSqlCommand()方法
-- 添加数据
create procedure AddProduct
(
@name as nvarchar(50),
@price as decimal(18,2),
@unit as nvarchar(10)
)
as
begin
insert into tb_Products values(newid(),@name,@price,'469b82be-8139-4e67-b566-5b2b5f6d838d',getdate(),@unit)
end
go
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var parameterList = new List<SqlParameter>
{
new SqlParameter(){ ParameterName="@name",SqlDbType = System.Data.SqlDbType.NVarChar,Value ="花生"},
new SqlParameter(){ ParameterName="@price",SqlDbType = System.Data.SqlDbType.Decimal,Value = 4.4},
new SqlParameter(){ ParameterName ="@unit",SqlDbType = System.Data.SqlDbType.NVarChar,Value="斤"}
};
var paraArr = parameterList.ToArray();
var res = ctx.Database.ExecuteSqlCommand("dbo.addproduct @name,@price,@unit", paraArr);
Console.WriteLine(res); // result : 1
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EF自动生成存储过程
上面的存储过程都是手动添加，现在我们在OnModelCreating方法中写配置，让它自动添加存储过程
modelBuilder.Entity<Order>().MapToStoredProcedures();
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这样他会给你生成三个存储过程
public partial class jinshantest4 : DbMigration
{
public override void Up()
{
CreateStoredProcedure(
"dbo.Order_Insert",
p => new
{
Id = p.String(maxLength: 128),
OrderNO = p.String(),
Description = p.String(),
AddTime = p.DateTime(),
},
body:
@"INSERT [dbo].[tb_Orders]([Id], [OrderNO], [Description], [AddTime])
VALUES (@Id, @OrderNO, @Description, @AddTime)"
);
CreateStoredProcedure(
"dbo.Order_Update",
p => new
{
Id = p.String(maxLength: 128),
OrderNO = p.String(),
Description = p.String(),
AddTime = p.DateTime(),
},
body:
@"UPDATE [dbo].[tb_Orders]
SET [OrderNO] = @OrderNO, [Description] = @Description, [AddTime] = @AddTime
WHERE ([Id] = @Id)"
);
CreateStoredProcedure(
"dbo.Order_Delete",
p => new
{
Id = p.String(maxLength: 128),
},
body:
@"DELETE [dbo].[tb_Orders]
WHERE ([Id] = @Id)"
);
}
public override void Down()
{
DropStoredProcedure("dbo.Order_Delete");
DropStoredProcedure("dbo.Order_Update");
DropStoredProcedure("dbo.addOrder");
}
}
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也可以对它进行详细配置，比如我指定insert存储过程的名称为“orderAdd”
modelBuilder.Entity<Order>().MapToStoredProcedures(x => x.Insert(a => a.HasName("addOrder")));
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跟新后，可以看到存储过程都添加 成功了
最后来调用一个EF为我们创建的存储过程
// 添加一个订单
var parameterList = new List<SqlParameter>
{
new SqlParameter{ ParameterName="@Id",SqlDbType = System.Data.SqlDbType.NVarChar,Value = Guid.NewGuid().ToString()},
new SqlParameter{ ParameterName="@OrderNO",SqlDbType = System.Data.SqlDbType.NVarChar,Value ="order435435"},
new SqlParameter{ ParameterName="@Description",SqlDbType = System.Data.SqlDbType.NVarChar,Value="description4364537ryrtey"},
new SqlParameter{ ParameterName="@AddTime",SqlDbType = System.Data.SqlDbType.DateTime,Value =DateTime.Now}
};
var paraArr = parameterList.ToArray();
var res = ctx.Database.ExecuteSqlCommand("dbo.addOrder @Id,@OrderNO,@Description,@AddTime",paraArr);
Console.WriteLine(res); // result:1
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可以的
