EF 存储过程

今天我们利用EF执行sql语句的方式来执行存储过程，并得到OutPut的值。

　　首先新建存储过程：

　　　　

Create PROCEDURE proc_testEF

  (

    @id int,

    @voteCount int OUTPUT --返回值

  )

  AS

  BEGIN

    SELECT @voteCount = COUNT(*)

    FROM ConfirmItem

    WHERE ConfirmItemID = @id;

    select * from ConfirmItem where ConfirmItemID=@id;

  END

  

　　然后写EF调用方法：

　　

using (DBEntities context = new DBEntities())

           {

               var idParam = new System.Data.SqlClient.SqlParameter

               {

                   ParameterName = "@id",

                   Value = 1

               };

               var votesParam = new System.Data.SqlClient.SqlParameter

               {

                   ParameterName = "@voteCount",

                   Value = 0,

                   Direction = ParameterDirection.Output

               };

               var results = context.Database.SqlQuery<Models.ConfirmItem>(

                   "proc_testEF @id, @voteCount out",

                    idParam,

                   votesParam);

 

 

               var person = results.Single();

               var votes = (int)votesParam.Value; //得到OutPut类型值

               return votes;

           }

　　测试多次，没有什么问题；最后我对方法进行封装：

　　

/// <summary> 

/// 执行原始SQL命令 

/// </summary> 

/// <param name="commandText">SQL命令</param> 

/// <param name="parameters">参数</param> 

/// <returns>影响的记录数</returns> 

public Object[] ExecuteSqlNonQuery<T>(string commandText, params Object[] parameters)

{

    using (DBEntities context = new DBEntities())

    {

        var results = context.Database.SqlQuery<T>(commandText, parameters);

        results.Single();

        return parameters;

    }

}

　　调用方式：

　　

var idParam = new System.Data.SqlClient.SqlParameter

               {

                   ParameterName = "@id",

                   Value = 1

               };

               var votesParam = new System.Data.SqlClient.SqlParameter

               {

                   ParameterName = "@voteCount",

                   Value = 0,

                   Direction = ParameterDirection.Output

               };

               System.Data.SqlClient.SqlParameter[] parm = {

                                                           idParam,

                                                           votesParam

                                                           };

               parm = (System.Data.SqlClient.SqlParameter[])new BLL.Usual.ConfirmItemManager().ExecuteSqlNonQuery<Models.ConfirmItem>("proc_testEF @id, @voteCount out", parm);

               

               string s = parm[1].Value.ToString();

　　当然还有其它的方式，只是觉得这种简单方便，比起添加实体模型来说，要方便很多！