20.Elasticsearch索引基础查询-2

2022-04-19 本文已影响0人大勇任卷舒

20.1 确切值搜索

默认情况下，搜索会返回所有字段。如果我们不希望返回整个源文档，我们可以从源文档中只求几个字段来返回。
下面的例子展示了只返回文档中的两个字段：account_number 和 balance字段。

curl -X GET "localhost:9200/bank/_search?pretty" -H 'Content-Type: application/json' -
d'
{
  "query": { "match_all": {} },
  "_source": ["account_number", "balance"]
}
‘

搜索结果：

20.2 bool查询

bool查询允许我们使用布尔逻辑将较小的查询组合成较大的查询。
示例：将两个match查询组合在一起，返回address中包含“mill”和“lane”的账户。

curl -X GET "localhost:9200/bank/_search?pretty" -H 'Content-Type: application/json' -d'
{
  "query": {
    "bool": {
      "must": [
        { "match": { "address": "mill" } },
        { "match": { "address": "lane" } }
      ]
    }
  }
}
‘

此搜索相当于：SELECT * FROM bank WHERE address LIKE‘%mill%lane%‘，符合条件的只有一条。
运行结果：
以上bool查询中使用的条件为must，意思为所有条件必须同时符合，另外还有更多的条件可选
- should:多个条件中满足一个即可
- must_not:必须没有设定条件
- must:必须同时符合所有条件

20.3 全文搜索

比如想要搜索下所有喜欢攀岩（rock climbing）的雇员

GET /megacorp/employee/_search
{
  "query" : {
    "match" : {
      "about" : "rock climbing"
    } 
  } 
}
{
  "took": 2,
  "timed_out": false,
  "_shards": {
    "total": 5,
    "successful": 5,
    "skipped": 0,
    "failed": 0
  },
  "hits": {
    "total": 2,
    "max_score": 0.53484553,
    "hits": [
      {
        "_index": "megacorp",
        "_type": "employee",
        "_id": "1",
        "_score": 0.53484553,
        "_source": {
          "first_name": "John",
          "last_name": "Smith",
          "age": 25,
          "about": "I love to go rock climbing",
          "interests": [
            "sports",
            "music"
          ]
        }
      },
      {
       "_index": "megacorp",
        "_type": "employee",
        "_id": "2",
        "_score": 0.26742277,
        "_source": {
          "first_name": "Jane",
          "last_name": "Smith",
          "age": 32,
          "about": "I like to collect rock albums",
          "interests": [
            "music"
          ]
        }
      }
    ]
  }
}

20.Elasticsearch索引基础查询-2

20.1 确切值搜索

20.2 bool查询

20.3 全文搜索

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