Question

有没有办法检查文档字段是否包含查询中的字符串？

例如：

collection cities：

{ "_id" : 1, "name" : "Madrid" }
{ "_id" : 2, "name" : "Lisbon" }
{ "_id" : 3, "name" : "Paris" }

查询：

db.cities.find({
    name: {$isIn: 'Address of the street, Lisbon'}
});

结果：

{ "_id" : 2, "name" : "Lisbon" }

Answer 1

是的，这是可能的。看看$text documentation。基本上你必须在字段上创建一个文本索引，然后你可以搜索如下：

SELECT 
  "menu_item_categories"."id", "menu_item_categories"."created_at",
  "menu_item_categories"."updated_at", "menu_item_categories"."restaurant_id", 
  "menu_item_categories"."name", "menu_item_categories"."is_active",
COUNT("line_items"."order_id") AS "line_items_quantity", 
  (SELECT 
      U0."id", U0."created_at", U0."updated_at", 
      U0."restaurant_id", U0."category_id", U0."name", 
      SUM(U1."amount") AS "amount"
  FROM "menu_items" 
  U0 INNER JOIN "line_items" U1 
  ON (U0."id" = U1."menu_item_id") 
  INNER JOIN "orders" U2 
  ON (U1."order_id" = U2."id") 
  WHERE (
      U2."waiter_id" = 5 AND U2."closed_at" 
      BETWEEN 2017-12-20 14:19:16+00:00 AND 2017-12-26 14:19:16+00:00)
      GROUP BY U0."id") 
  AS "menu_items", 
  SUM("line_items"."amount") AS "amount" 
  FROM "menu_item_categories" 
  LEFT OUTER JOIN "menu_items" 
  ON ("menu_item_categories"."id" = "menu_items"."category_id") 
  LEFT OUTER JOIN "line_items" 
  ON ("menu_items"."id" = "line_items"."menu_item_id") 
  GROUP BY "menu_item_categories"."id", 
  (
      SELECT 
          U0."id", U0."created_at", 
          U0."updated_at", U0."restaurant_id", 
          U0."category_id", U0."name", SUM(U1."amount"
  ) AS "amount" 
  FROM "menu_items" U0 
  INNER JOIN "line_items" U1 
  ON (U0."id" = U1."menu_item_id") 
  INNER JOIN "orders" U2 
  ON (U1."order_id" = U2."id") 
  WHERE (U2."waiter_id" = 5 
         AND U2."closed_at" 
         BETWEEN 2017-12-20 14:19:16+00:00 
         AND 2017-12-26 14:19:16+00:00) 
  GROUP BY U0."id")

在这种情况下创建索引的示例。由于您的字段名为db.cities.find({ $text: { $search: "Address of the street, Lisbon" } })：

name

您有很多可能性，例如排除短语，仅包含，区分大小写等。

让我们说我添加以下文件：

db.cities.createIndex( { name: "text" } )

如果我们这样搜索：

{ "_id" : NumberInt(1), "name" : "Madrid" }
{ "_id" : NumberInt(2), "name" : "Lisbon" }
{ "_id" : NumberInt(3), "name" : "Paris" }
{ "_id" : NumberInt(4), "name" : "Address"}

我们会得到2个结果：

db.cities.find({ $text: { $search: "Address of the street, Lisbon" } })

但如果我们这样搜索：

{ "_id" : NumberInt(2), "name" : "Lisbon"}
{ "_id" : NumberInt(4), "name" : "Address"}

我们只会得到：

db.cities.find({ $text: { $search: "-Address of the street, Lisbon" } })

因为（ - ）您可以排除包含此术语的文档。有关更多可能性，请查看文档

Answer 2

db.cities.find({"name" : {$regex : ".*Lisbon.*"}});

是的，你可以使用正则表达式找到一些字符串模式。

检查查询是否包含文档字段

2 个答案: