ServiceStack OrmLite包括WHERE子句中，但不要選擇

Question

考慮LoyaltyCard數據庫DTO欄我有以下：

[Alias("customer_ids")] 
[CompositeIndex("id_code", "id_number", Unique = true)] 
public class LoyaltyCard 
{ 
    [Alias("customer_code")] 
    public int CustomerId { get; set; } 

    [Alias("id_code")] 
    public string LoyaltyCardCode { get; set; } 

    [Alias("id_number")] 
    public string LoyaltyCardNumber { get; set; } 

    [Alias("date_issued ")] 
    public DateTime? IssueDate { get; set; } 

    [Alias("linked_id")] 
    public bool LinkedId { get; set; } 

    [Alias("positive_id")] 
    public bool PositiveId { get; set; } 
} 

我有CustomerId作爲一個屬性，因爲我需要它被包含在生成的SQL的WHERE子句中，但我不希望在結果集中也選擇該列。有沒有辦法將它包含在哪裏但將它從選擇中排除？

// I was hoping that result would not have a populated CustomerIds 
var result = db.Select<LoyaltyCard>(id => id.LoyaltyCardCode == "PS" && id.CustomerId == customerCode); 

我試着加入[Ignore]屬性，但失敗與SqlException: Invalid column name 'CustomerId'。

Answer 1

如果你不希望整個POCO填入你需要指定與您希望選擇的字段，e.g自定義選擇：

var result = db.Select<LoyaltyCard>(db.From<LoyaltyCard>() 
    .Where(id => id.LoyaltyCardCode == "PS" && id.CustomerId == customerCode) 
    .Select(x => new { 
     x.LoyaltyCardCode, 
     x.LoyaltyCardNumber, 
     x.IssueDate, 
     x.LinkedId, 
     x.PositiveId 
    }));