c# - Asp.net MVC 3 存储过程从表中返回一个值

Question

我有我想要返回的 SQL：

  CREATE PROCEDURE [Zinc].[GetUserByEmail]
    @Email nvarchar (256)
  AS
    SELECT zu.UserId FROM zinc.users zu WHERE zu.Email = @Email

然后在我的存储库中我到目前为止：

public int GetUserByEmail(string email)
{
    using (SqlConnection conn = new SqlConnection(ZincModelContainer.CONNECTIONSTRING))
    {
        using (SqlCommand cmd = conn.CreateCommand())
        {
            conn.Open();

            cmd.CommandType = System.Data.CommandType.StoredProcedure;
            cmd.CommandText = "[Zinc].[GetUserByEmail]";

            //not sure how to go from here?
        }
        return userId;
    }
}

Answer 1

因为它是一个标量值，所以使用：

cmd.Parameters.Add("@Email", SqlDbType.NChar).Value = email;
var UserId = cmd.ExecuteScalar();

Answer 2

cmd.Parameters.Add("@Email", SqlDbType.NChar).Value = email;

int UserId = cmd.ExecuteScalar();

Answer 3

Microsoft 文档通常是最好的起点。有关从 SqlConnection 读取的示例，请参阅：http: //msdn.microsoft.com/en-us/library/877h0y3a.aspx 。