ElasticSearch的CRUD操作

1.CREATE

elasticsearch会自动建立index和type，不需要提前创建，而且elasticsearch默认会对document的每个filed建立倒排索引，方便搜索；

• 操作命令

PUT /index/type/id
{
  "filed":"value"
}

• 操作示例

#操作例子
PUT /accounting_tools/voucher_detail/111
{
  "subjectId" : "123",
  "subjectCode" : "1001",
  "subjectName" : "库存现金",
  "period" : "201901",
  "amount" : 100.0,
  "tags": ["资产", "负债", "收入", "费用"],
  "auxiliary": {
    "auxId":"123",
    "auxCode":"001",
    "auxName":"客户"
  }
}

#操作结果
{
  "_index" : "accounting_tools",
  "_type" : "voucher_detail",
  "_id" : "111",
  "_version" : 1,
  "result" : "created",
  "_shards" : {
    "total" : 2,
    "successful" : 1,
    "failed" : 0
  },
  "_seq_no" : 8,
  "_primary_term" : 1
}

total：指的是预计写入两条数据；successful：指的是写入成功的数据条数；为什么明明写入的是两条数据，怎么只成功了一条呢？那是因为每个索引至少要写入一条数据 primary shard和replica shard中，这也就能解释为什么total为2了，至于只写入成功一条数据，那是因为我的elasticsearch是一个节点的单机版，而primary shard 和 replica shard 由于要容错的原因，必须在不同的机器上，所以只往primary shard写入成功了一条数据，写入replica shard失败了。

2.READ

• 操作命令

GET /index/type/id

• 操作示例

#操作例子
GET /accounting_tools/voucher_detail/111

#操作结果
{
  "_index" : "accounting_tools",
  "_type" : "voucher_detail",
  "_id" : "111",
  "_version" : 5,
  "found" : true,
  "_source" : {
    "subjectId" : "123",
    "subjectCode" : "1001",
    "subjectName" : "库存现金",
    "period" : "201901",
    "amount" : 100.0,
    "tags" : [
      "资产",
      "负债",
      "收入",
      "费用"
    ],
    "auxiliary" : {
      "auxId" : "123",
      "auxCode" : "001",
      "auxName" : "客户"
    }
  }
}

3.UPDATE

3.1.替换

必须带上所有filed，否者会造成部分数据filed丢失/覆盖

• 操作指令

PUT /index/type/id
{
  "filed":"value"
}

• 操作示例

#操作例子
PUT /accounting_tools/voucher_detail/111
{
  "subjectId" : "123",
  "subjectCode" : "1001",
  "subjectName" : "库存现金",
  "period" : "201901",
  "amount" : 100.0,
  "tags": ["资产", "负债", "收入", "费用"],
  "auxiliary": {
    "auxId":"123",
    "auxCode":"001",
    "auxName":"客户"
  }
}

#操作结果
{
  "_index" : "accounting_tools",
  "_type" : "voucher_detail",
  "_id" : "111",
  "_version" : 2,
  "result" : "updated",
  "_shards" : {
    "total" : 2,
    "successful" : 1,
    "failed" : 0
  },
  "_seq_no" : 2,
  "_primary_term" : 1
}

3.2.更新

• 操作指令

POST /index/type/id/_update
{
  "doc": {
 	 "filed":"value"
  }
}

• 操作示例

#操作例子
POST /accounting_tools/voucher_detail/111/_update
{
  "doc": {
    "amount":105.00
  }
}
#操作结果
{
  "_index" : "accounting_tools",
  "_type" : "voucher_detail",
  "_id" : "111",
  "_version" : 2,
  "result" : "updated",
  "_shards" : {
    "total" : 2,
    "successful" : 1,
    "failed" : 0
  },
  "_seq_no" : 2
  "_primary_term" : 1
}

4.DELETE

• 操作示例

DELETE /index/type/id

• 操作示例

#操作例子
DELETE /accounting_tools/voucher_detail/101010

#操作结果
{
  "_index" : "accounting_tools",
  "_type" : "voucher_detail",
  "_id" : "111",
  "_version" : 2,
  "result" : "deleted",
  "_shards" : {
    "total" : 2,
    "successful" : 1,
    "failed" : 0
  },
  "_seq_no" : 9,
  "_primary_term" : 1
}