C#中使用存储过程返回值的问题(转)

1.存储过程返回SqlDataReader
public SqlDataReader getaqiyyuy(string qiy)
{
SqlConnection userConnection = Connection.getConnection();
SqlCommand userCommand = new SqlCommand("MVC_getaqiyluy", userConnection);
userCommand.CommandType = CommandType.StoredProcedure;//采用存储过程
userCommand.Parameters.Add("@qiy", SqlDbType.VarChar, 50);//存储过程参数
userCommand.Parameters["@qiy"].Value = qiy;//给参数赋值
userCommand.Connection.Open();//打开连接
SqlDataReader datareader;
datareader = userCommand.ExecuteReader();
return datareader;
}
返回一个SqlDataReader类型的值

2.返回单个字符
存储过程
ALTER procedure MVC_getqiym
@yonghm varchar(50),
@qiy varchar(50) OUTPUT
as

set @qiy=(select Q.MingC From T_QiYXXB Q,T_YongHXXB Y
where Q.QiYBH=Y.QiYBH)

程序
public string getqiym(string yonghm)
{
string qiy;
SqlConnection userConnection = Connection.getConnection();
SqlCommand userCommand = new SqlCommand("MVC_getqiym", userConnection);
userCommand.CommandType = CommandType.StoredProcedure;//采用存储过程
userCommand.Parameters.Add("@yonghm", SqlDbType.VarChar, 50);//存储过程参数
userCommand.Parameters["@yonghm"].Value = yonghm;//给参数赋值
userCommand.Parameters.Add("@qiy",SqlDbType.VarChar,50);
userCommand.Parameters["@qiy"].Direction =ParameterDirection.Output;
userCommand.Connection.Open();//打开连接
try
{
userCommand.ExecuteScalar();
}
catch (SqlException ee)
{
throw(ee);
}
finally
{
userCommand.Connection.Close();
}
qiy = Convert.ToString(userCommand.Parameters["@qiy"].Value);
return qiy;
}

建议在存储过程使用output
return只能返回int类型的