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
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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;
}
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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();
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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！