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我有这样的查询
_AddOrderBy(sortOptions, query)
.Fetch(x => x.ImageType).Eager
.Fetch(x => x.User).Eager
.Fetch(x => x.Partner).Eager
.Inner.JoinAlias(x => x.Partner, () => p).Fetch(x => x.Company).Eager
.Skip(startIndex)
.Take(pageSize)
.List<ImageRequest>();
在上面的QueryOver中，我调用_AddOrderBy（）方法，该方法添加了一个order by子句。我面临的挑战是如何创建一个“ order by”，以引用位于以下关联路径内的属性（按“ CompanyName”排序），而又不与我的Fetch（）/内部联接冲突：
ImageRequest.Partner.Company.CompanyName
在我的_AddOrderBy（）中，我有这个：
Partner p = null;
Company comp = null;
order = query.Inner.JoinAlias(x => x.Partner, () => p)
.Inner.JoinAlias(x => x.Company, () => comp)
.OrderBy(x => comp.CompanyName);
但是，这给了我一个运行时异常，表明我在条件中有重复的密钥（指合作伙伴）。我可以看到这与我急切的获取相冲突。 我的问题是：
如何添加“排序依据”，以便与我的抓取配合使用。
答案 0 :(得分：1)
在QueryOver中使用别名的好处在于，如果Fetch发生在JoinAlias方法中，则不必在_AddOrderBy()方法中再次使用Join或_AddOrderBy()已查询。您只需要使用相同的名称声明别名。
因此，您的Partner p = null;
Company comp = null;
order = query
.Inner.JoinAlias(x => p.Company, () => comp) // you can use p here if it was used in the query before
.OrderBy(x => comp.CompanyName);
如下所示：
Partner p之所以起作用，是因为：如果将整个代码放在一个方法中，则显然会起作用。将其分为两种方法仍然可行，因为Alias不是对内存中对象的引用，而是对SELECT DISTINCT t3.prod_id,
t3.awaiting_approval,
t3.brand,
t3.prod_name,
t3.size,
t3.units,
t3.category,
t3.image,
t3.url,
t3.quantity,
t3.rank,
t3.word_count,
t3.word_count
FROM ((SELECT item_info_mem.prod_id,
item_info_mem.awaiting_approval,
item_info_mem.prod_name,
item_info_mem.brand,
item_info_mem.size,
item_info_mem.units,
item_info_mem.category,
(SELECT rank
FROM search_tags_mem
WHERE prod_id = item_info_mem.prod_id
AND tag = "bread"
ORDER BY rank
LIMIT 1) AS
rank,
(SELECT image
FROM images_mem
WHERE prod_id = item_info_mem.prod_id
ORDER BY id
LIMIT 1) AS
image,
(SELECT url
FROM urls_mem
WHERE prod_id = item_info_mem.prod_id
AND disabled IS NULL
ORDER BY id DESC
LIMIT 1) AS
url,
(SELECT quantity
FROM shopping_list_mem
WHERE user_id = "1"
AND prod_id = item_info_mem.prod_id
ORDER BY id
LIMIT 1) AS
quantity,
( Substrcount(Lcase(item_info_mem.prod_name), Lcase("bread"))
+ Substrcount(Lcase(item_info_mem.brand), Lcase("bread")) ) AS
word_count,
( Substrcheck(Lcase(item_info_mem.prod_name),
Lcase(item_info_mem.brand), Lcase("bread")) ) AS
word_count_unique
FROM item_info_mem
WHERE NOT EXISTS (SELECT id
FROM search_tags_omit_mem
WHERE prod_id = item_info_mem.prod_id
AND tag = "bread"
ORDER BY id DESC
LIMIT 1)
AND ( item_info_mem.prod_name REGEXP "bread"
OR item_info_mem.brand REGEXP "bread" )
AND EXISTS(SELECT scans_mem.scan_id
FROM scans_mem,
stores_mem
WHERE scans_mem.price IS NOT NULL
AND scans_mem.expired IS NULL
AND item_info_mem.prod_id = scans_mem.prod_id
AND NOT
EXISTS (SELECT
user_stores_disabled_mem.user_id
FROM
user_stores_disabled_mem
,
stores_mem
WHERE scans_mem.store_id =
stores_mem.id
AND
user_stores_disabled_mem.chain =
stores_mem.chain
AND
user_stores_disabled_mem.user_id =
1)
AND ( Sqrt(Pow(111 * (stores_mem.gps_lat
- 40.748080
), 2)
+ Pow(111 * (stores_mem.gps_lng -
-73.990533) *
Cos(
40.748080 /
57.3)
,
2)) <= (SELECT user_mem.distance
FROM user_mem
WHERE id = 1))
AND stores_mem.id = scans_mem.store_id))
UNION ALL
(SELECT item_info_mem.prod_id,
item_info_mem.awaiting_approval,
item_info_mem.prod_name,
item_info_mem.brand,
item_info_mem.size,
item_info_mem.units,
item_info_mem.category,
search_tags_mem.rank,
(SELECT image
FROM images_mem
WHERE prod_id = item_info_mem.prod_id
ORDER BY id
LIMIT 1) AS image,
(SELECT url
FROM urls_mem
WHERE prod_id = item_info_mem.prod_id
AND disabled IS NULL
ORDER BY id DESC
LIMIT 1) AS
url,
(SELECT quantity
FROM shopping_list_mem
WHERE user_id = "1"
AND prod_id = item_info_mem.prod_id
ORDER BY id
LIMIT 1) AS
quantity,
( Substrcount(Lcase(item_info_mem.prod_name), Lcase("bread"))
+ Substrcount(Lcase(item_info_mem.brand), Lcase("bread")) ) AS
word_count,
( Substrcheck(Lcase(item_info_mem.prod_name),
Lcase(item_info_mem.brand), Lcase("bread")) ) AS
word_count_unique
FROM item_info_mem,
search_tags_mem,
scans_mem,
stores_mem
WHERE NOT EXISTS (SELECT id
FROM search_tags_omit_mem
WHERE prod_id = item_info_mem.prod_id
AND tag = "bread"
ORDER BY id DESC
LIMIT 1)
AND scans_mem.price IS NOT NULL
AND scans_mem.expired IS NULL
AND item_info_mem.prod_id = search_tags_mem.prod_id
AND search_tags_mem.tag = "bread"
AND item_info_mem.prod_id = scans_mem.prod_id
AND NOT EXISTS (SELECT user_stores_disabled_mem.user_id
FROM user_stores_disabled_mem,
stores_mem
WHERE scans_mem.store_id = stores_mem.id
AND user_stores_disabled_mem.chain =
stores_mem.chain
AND user_stores_disabled_mem.user_id = 1)
AND ( Sqrt(Pow(111 * (stores_mem.gps_lat - 40.748080), 2)
+ Pow(111 * (stores_mem.gps_lng - -73.990533) * Cos(
40.748080 /
57.3)
,
2)) <= (SELECT user_mem.distance
FROM user_mem
WHERE id = 1))
AND stores_mem.id = scans_mem.store_id)) t3
ORDER BY -rank DESC,
word_count_unique DESC,
word_count DESC,
Field(t3.category, "food", "grocery", "pantry, household & pets",
"confectionery and grocery") DESC,
Length(prod_name),
brand
LIMIT 0, 10
````
的引用，该$ cat file
[-0.0, 1.23]
[-0.0, 1.23, 4.56]
foo=[12.3, 4.5, 3.0, 4.1], bar=123.0, xyz=6.7
[1,2,-3,4]
只是转换为SQL查询的字符串。