Elasticsearch-核心篇(6)-映射操作
文章目录
- 一、创建映射
- 1.1 创建时映射
- 1.2 映射修改
- 1.3 添加时映射
- 二、查看映射
一、创建映射
- 有了索引库,等于有了数据库中的database
- 接下来就需要建索引库(index)中的映射,类似于数据库(database)中的表结构(table)
- 创建数据库表需要设置字段名称,类型,长度,约束等;索引库也一样,需要知道这个类型下有哪些字段,每个字段有哪些约束信息,这就叫做映射(mapping)
- 如果不指定映射将会默认按照给定的类型自动添加对应映射
1.1 创建时映射
可以在创建索引时指定映射
- 其中mappings.properties为固定结构,指定创建映射属性
PUT index
{
“mappings” : {"properties" : {
"id" : {
"type" : "long"
},
"title" : {
"type" : "text"
}
}
}
}创建完成后将会返回创建信息
{
“index” : {"aliases" : { },
"mappings" : {
"properties" : {
"id" : {
"type" : "long"
},
"title" : {
"type" : "text"
}
}
},
"settings" : {
"index" : {
"creation_date" : "1623072136760",
"number_of_shards" : "1",
"number_of_replicas" : "1",
"uuid" : "aatM8ty0QQuZWXo-99lvnA",
"version" : {
"created" : "7080099"
},
"provided_name" : "index"
}
}
}
}
1.2 映射修改
- 可以对已经存在的索引添加映射
- 需要使用 PUT /_mapping
修改时只需要指定properties即可,不需要指定mappings
PUT index/_mapping
{
“properties” : {"id" : {
"type" : "long"
},
"title" : {
"type" : "text"
}
}
}修改结果
{
“acknowledged” : true
}
1.3 添加时映射
- 如果不明确指定,则将会在添加数据时自动判定
创建普通索引,此时没有映射信息
{
“index” : {"aliases" : { },
"mappings" : { },
"settings" : {
"index" : {
"creation_date" : "1623072418993",
"number_of_shards" : "1",
"number_of_replicas" : "1",
"uuid" : "682iz4t_TRa-1Nc7bfm-ng",
"version" : {
"created" : "7080099"
},
"provided_name" : "index"
}
}
}
}向索引中添加数据
POST index/_doc/1
{
“id”: 3,"title": "华为手机",
"category": "华为"
}
将会自动识别对应值的映射
{
“index” : {"aliases" : { },
"mappings" : {
"properties" : {
"category" : {
"type" : "text",
"fields" : {
"keyword" : {
"type" : "keyword",
"ignore_above" : 256
}
}
},
"id" : {
"type" : "long"
},
"title" : {
"type" : "text",
"fields" : {
"keyword" : {
"type" : "keyword",
"ignore_above" : 256
}
}
}
}
},
"settings" : {
"index" : {
"creation_date" : "1623072418993",
"number_of_shards" : "1",
"number_of_replicas" : "1",
"uuid" : "682iz4t_TRa-1Nc7bfm-ng",
"version" : {
"created" : "7080099"
},
"provided_name" : "index"
}
}
}
}
二、查看映射
查看索引完全信息,内容包含映射信息
GET index
{
“index” : {"aliases" : { },
"mappings" : {
"properties" : {
"category" : {
"type" : "text",
"fields" : {
"keyword" : {
"type" : "keyword",
"ignore_above" : 256
}
}
},
"id" : {
"type" : "long"
},
"title" : {
"type" : "text",
"fields" : {
"keyword" : {
"type" : "keyword",
"ignore_above" : 256
}
}
}
}
},
"settings" : {
"index" : {
"creation_date" : "1623072418993",
"number_of_shards" : "1",
"number_of_replicas" : "1",
"uuid" : "682iz4t_TRa-1Nc7bfm-ng",
"version" : {
"created" : "7080099"
},
"provided_name" : "index"
}
}
}
}指定查询索引信息
GET index/_mapping
{
“index” : {"mappings" : {
"properties" : {
"category" : {
"type" : "text",
"fields" : {
"keyword" : {
"type" : "keyword",
"ignore_above" : 256
}
}
},
"id" : {
"type" : "long"
},
"title" : {
"type" : "text",
"fields" : {
"keyword" : {
"type" : "keyword",
"ignore_above" : 256
}
}
}
}
}
}
}
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