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db/Elasticsearch系列/9-11文档操作/1-Elasticsearch的增删查改(CURD)

2020-03-09

Elasticsearch的增删查改(CURD)

一 CURD之Create

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PUT lqz/doc/1
{
"name":"顾老二",
"age":30,
"from": "gu",
"desc": "皮肤黑、武器长、性格直",
"tags": ["黑", "长", "直"]
}

他明处貌似还有俩老婆:

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PUT lqz/doc/2
{
"name":"大娘子",
"age":18,
"from":"sheng",
"desc":"肤白貌美,娇憨可爱",
"tags":["白", "富","美"]
}

PUT lqz/doc/3
{
"name":"龙套偏房",
"age":22,
"from":"gu",
"desc":"mmp,没怎么看,不知道怎么形容",
"tags":["造数据", "真","难"]
}

家里红旗不倒,家外彩旗飘摇:

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PUT lqz/doc/4
{
"name":"石头",
"age":29,
"from":"gu",
"desc":"粗中有细,狐假虎威",
"tags":["粗", "大","猛"]
}

PUT lqz/doc/5
{
"name":"魏行首",
"age":25,
"from":"广云台",
"desc":"仿佛兮若轻云之蔽月,飘飘兮若流风之回雪,mmp,最后竟然没有嫁给顾老二!",
"tags":["闭月","羞花"]
}

注意:当执行PUT命令时,如果数据不存在,则新增该条数据,如果数据存在则修改该条数据。

咱们通过GET命令查询一下:

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GET lqz/doc/1

结果如下:

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{
"_index" : "lqz",
"_type" : "doc",
"_id" : "1",
"_version" : 1,
"found" : true,
"_source" : {
"name" : "顾老二",
"age" : 30,
"from" : "gu",
"desc" : "皮肤黑、武器长、性格直",
"tags" : [
"黑",
"长",
"直"
]
}
}

查询也没啥问题,但是你可能说了,人家老二是黄种人,怎么是黑的呢?好吧咱改改desctags

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PUT lqz/doc/1
{
"desc":"皮肤很黄,武器很长,性格很直",
"tags":["很黄","很长", "很直"]
}

上例,我们仅修改了desctags两处,而nameagefrom三个属性没有变化,我们可以忽略不写吗?查查看:

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GET lqz/doc/1

结果如下:

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{
"_index" : "lqz",
"_type" : "doc",
"_id" : "1",
"_version" : 3,
"found" : true,
"_source" : {
"desc" : "皮肤很黄,武器很长,性格很直",
"tags" : [
"很黄",
"很长",
"很直"
]
}
}

哎呀,出事故了!修改是修改了,但结果不太理想啊,因为nameagefrom属性都没啦!
注意:PUT命令,在做修改操作时,如果未指定其他的属性,则按照指定的属性进行修改操作。也就是如上例所示的那样,我们修改时只修改了desctags两个属性,其他的属性并没有一起添加进去。

很明显,这是病!dai治!怎么治?上车,咱们继续往下走!

二 CURD之Update

让我们首先恢复一下事故现场:

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PUT lqz/doc/1
{
"name":"顾老二",
"age":30,
"from": "gu",
"desc": "皮肤黑、武器长、性格直",
"tags": ["黑", "长", "直"]
}

我们要将黑修改成黄:

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POST lqz/doc/1/_update
{
"doc": {
"desc": "皮肤很黄,武器很长,性格很直",
"tags": ["很黄","很长", "很直"]
}
}

上例中,我们使用POST命令,在id后面跟_update,要修改的内容放到doc文档(属性)中即可。

我们再来查询一次:

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GET lqz/doc/1

结果如下:

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{
"_index" : "lqz",
"_type" : "doc",
"_id" : "1",
"_version" : 5,
"found" : true,
"_source" : {
"name" : "顾老二",
"age" : 30,
"from" : "gu",
"desc" : "皮肤很黄,武器很长,性格很直",
"tags" : [
"很黄",
"很长",
"很直"
]
}
}

结果如上例所示,现在其他的属性没有变化,只有desctags属性被修改。

注意:POST命令,这里可用来执行修改操作(还有其他的功能),POST命令配合_update完成修改操作,指定修改的内容放到doc

写了这么多,我也发现我上面有讲的不对的地方——石头不是跟顾老二不清不楚,石头是跟小桃不清不楚!好吧,刚才那个数据是一个错误示范!我们这就把它干掉!

三CURD之Delete

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DELETE lqz/doc/4

很简单,通过DELETE命令,就可以删除掉那个错误示范了!

删除效果如下:

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{
"_index" : "lqz",
"_type" : "doc",
"_id" : "4",
"_version" : 4,
"result" : "deleted",
"_shards" : {
"total" : 2,
"successful" : 1,
"failed" : 0
},
"_seq_no" : 4,
"_primary_term" : 1
}

我们再来查询一遍:

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GET lqz/doc/4

结果如下:

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{
"_index" : "lqz",
"_type" : "doc",
"_id" : "4",
"found" : false
}

上例中,found:false表示查询数据不存在。

四 CURD之Retrieve

我们上面已经不知不觉的使用熟悉这种简单查询方式,通过 GET命令查询指定文档:

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GET lqz/doc/1

结果如下:

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{
"_index" : "lqz",
"_type" : "doc",
"_id" : "1",
"_version" : 5,
"found" : true,
"_source" : {
"name" : "顾老二",
"age" : 30,
"from" : "gu",
"desc" : "皮肤很黄,武器很长,性格很直",
"tags" : [
"很黄",
"很长",
"很直"
]
}
}
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