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?
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();
看一下这个链接，它展示了如何将EF 6与存储过程映射为插入、更新和删除:http://msdn.microsoft.com/en-us/data/dn468673
除了
下面是一个从Code First调用存储过程的好例子:
假设你必须执行一个带有单个参数的存储过程，并且该存储过程返回一组与实体状态匹配的数据，因此我们将有:
var countryIso = "AR"; //Argentina
var statesFromArgentina = context.Countries.SqlQuery(
"dbo.GetStatesFromCountry @p0", countryIso
);
现在假设我们想要执行另一个带有两个参数的存储过程:
var countryIso = "AR"; //Argentina
var stateIso = "RN"; //Río Negro
var citiesFromRioNegro = context.States.SqlQuery(
"dbo.GetCitiesFromState @p0, @p1", countryIso, stateIso
);
注意，我们对参数使用基于索引的命名。这是因为实体框架将这些参数包装为DbParameter对象，以避免任何SQL注入问题。
希望这个例子能有所帮助!
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。
