999 - Elasticsearch Query DSL 03 - Full text queries - Match Query

Match Query

字符串类型

GET /examples/_search
{
  "query": {
    "match": {
      "address": "Jiangsu"
    }
  }
}

数字类型

GET /examples/_search
{
  "query": {
    "match": {
      "age": 22
    }
  }
}

日期类型：虽然像字符串，但其实是日期，可以用GET /examples/_mapping查看每个字段的类型。

GET /examples/_search
{
  "query": {
    "match": {
      "birth": "1997-03-26"
    }
  }
}

operator默认or，所以结果含有China或Xuzhou

operator设为and，结果就需要同时含有China和Xuzhou

但不等同于match_phrase，因为match中设operator为and时，仅表示都要满足，例如China Xuzhou可以查出结果为China Jiangsu Xuzhou的，但match_phrase则必须满足单词为China Xuzhou。

# operator默认or
GET /examples/_search
{
  "query": {
    "match": {
      "address": "China Xuzhou"
    }
  }
}

# operator设为and
GET /examples/_search
{
  "query": {
    "match": {
      "address": {
        "query": "China Xuzhou",
        "operator": "and"
      }
    }
  }
}
# 查不到结果
GET /examples/_search
{
  "query": {
    "match_phrase": {
      "address": "China Xuzhou"
    }
  }
}

minimum_should_match控制需要满足条件的个数，默认为1。

# 只需满足China、Xuzhou两者之一
GET /examples/_search
{
  "query": {
    "match": {
      "address": {
        "query": "China Xuzhou", 
        "operator": "or"
      }
    }
  }
}

# 需要满足两个子句
GET /examples/_search
{
  "query": {
    "match": {
      "address": {
        "query": "China Xuzhou", 
        "operator": "or",
        "minimum_should_match": 2
      }
    }
  }
}

# 在operator为and的情况下，表示需要满足有两个China Xuzhou。
# 在这里就查不到数据了
GET /examples/_search
{
  "query": {
    "match": {
      "address": {
        "query": "China Xuzhou", 
        "operator": "and",
        "minimum_should_match": 2
      }
    }
  }
}

# 75%的子句需要被匹配。2 * 75% = 1.5，向下取整=1，所以只需要匹配一个。
GET /examples/_search
{
  "query": {
    "match": {
      "address": {
        "query": "China Xuzhou",
        "minimum_should_match": "75%"
      }
    }
  }
}

# 25%的子句可以被忽略。2 * 25% = 0.5，向下取整=0，2-0=2，所以需要匹配2个。
GET /examples/_search
{
  "query": {
    "match": {
      "address": {
        "query": "China Xuzhou",
        "minimum_should_match": "-25%"
      }
    }
  }
}

# 当小于等于1时，条件都是必须的；大于1时则需要满足100%个。
GET /examples/_search
{
  "query": {
    "match": {
      "address": {
        "query": "China Xuzhou",
        "minimum_should_match": "1 < 100%"
      }
    }
  }
}