Elasticsearch 详解mapping之boolean
1 简介
boolean类型非常简单，它就接受真或假。
| 判断 | ES接受的值 |
|---|---|
| 真 | true，“true” |
| 假 | false，“false”， “”(空字符) |
2 创建boolean类型的字段
创建一个books索引，name是书名，is_published是是否发行。
PUT books
{
"mappings":{
"properties":{
"name":{
"type":"keyword"
},
"is_published":{
"type":"boolean"
}
}
}
}
3 新增数据记录
创建如下7条记录，注意看他们的is_published都不一样。
PUT books/_doc/1
{
"name": "Java编程思想",
"is_published": true
}
PUT books/_doc/2
{
"name": "孙哥说Spring5",
"is_published": "true"
}
PUT books/_doc/3
{
"name": "雷丰阳Spring注解",
"is_published": false
}
PUT books/_doc/4
{
"name": "小码哥Vue.js教程",
"is_published": "false"
}
PUT books/_doc/5
{
"name": "易学教育Flink教程",
"is_published": ""
}
PUT books/_doc/6
{
"name": "尚硅谷Flink教程",
"is_published": null
}
PUT books/_doc/7
{
"name": "图灵Java面试指导"
}
#上面7个都能成功，这一个会插入失败
PUT books/_doc/8
{
"name": "尚硅谷Java面试指导",
"is_published": "啥也不是"
}
返回：
"type" : "illegal_argument_exception",
"reason" : "Failed to parse value [啥也不是] as only [true] or [false] are allowed."
}
4 验证boolean类型查询
4.1 查询is_published=true
GET books/_search
{
"query": {
"bool": {
"filter": [
{
"term": {
"is_published": true
}
}
]
}
}
}
返回如下：true和"true"是等价的
{
"hits":[
{
"_index":"books",
"_type":"_doc",
"_id":"2",
"_score":0,
"_source":{
"name":"孙哥说Spring5",
"is_published":"true"
}
},
{
"_index":"books",
"_type":"_doc",
"_id":"1",
"_score":0,
"_source":{
"name":"Java编程思想",
"is_published":true
}
}
]
}
4.2 查询is_published=false
GET books/_search
{
"query": {
"bool": {
"filter": [
{
"term": {
"is_published": false
}
}
]
}
}
}
返回如下：false，“false"和”"这3个是等价的
{
"hits":[
{
"_index":"books",
"_type":"_doc",
"_id":"4",
"_score":0,
"_source":{
"name":"小码哥Vue.js教程",
"is_published":"false"
}
},
{
"_index":"books",
"_type":"_doc",
"_id":"3",
"_score":0,
"_source":{
"name":"雷丰阳Spring注解",
"is_published":false
}
},
{
"_index":"books",
"_type":"_doc",
"_id":"5",
"_score":0,
"_source":{
"name":"易学教育Flink教程",
"is_published":""
}
}
]
}
4.3 对于null和缺失字段
- is_published=true的有2个记录，is_published=false的有3条记录。
- 总有7条记录，还有2条记录它们不是true也不是false。
- 在日常开发中一定要注意这些值，否则容易漏处理它们。
GET books/_search
{
"query": {
"bool": {
"must_not": [
{
"exists": {
"field": "is_published"
}
}
]
}
}
}
{
"hits":[
{
"_index":"books",
"_type":"_doc",
"_id":"6",
"_score":0,
"_source":{
"name":"尚硅谷Flink教程",
"is_published":null
}
},
{
"_index":"books",
"_type":"_doc",
"_id":"7",
"_score":0,
"_source":{
"name":"图灵Java面试指导"
}
}
]
}