+ CouchDB入门

一、简介
Apache CouchDB数据库，它类似于Redis，Cassandra和MongoDB，也是一个NoSQL数据库。 CouchDB将数据存储为非关系性的JSON文档。 这使得CouchDB的用户可以以与现实世界相似的方式来存储数据。
        可以从命令行或一个叫作Futon的Web界面来管理CouchDB。 Futon可用于执行管理任务，如创建和操作CouchDB的数据库，文档和用户等。




二、地址
  https://couchdb.apache.org/#download
cenos安装： 编辑 /etc/yum.repos.d/bintray-apache-couchdb-rpm.repo

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[bintray--apache-couchdb-rpm] name=bintray--apache-couchdb-rpm baseurl=http://apache.bintray.com/couchdb-rpm/el$releasever/$basearch/ gpgcheck=0 repo_gpgcheck=0 enabled=1

然后安装  yum -y install epel-release && sudo yum -y install couchdb
三、访问管理
启动后，可以通过浏览器访问页面 http://localhost:5984/_utils/index.html 来验证安装是否成功，也可以通过此页面管理CouchDB。
或者通过 curl 命令行来验证

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1 2	$ curl http://localhost:5984 {"couchdb":"Welcome","version":"2.3.1","git_sha":"c298091a4","uuid":"04de5436d56ab4a1a4ace6c16555fbe4","features":["pluggable-storage-engines","scheduler"],"vendor":{"name":"The Apache Software Foundation"}}

默认CouchDB只能被通过本机访问，可以通过修改vim /opt/couchdb/etc/default.ini文件中的 bind_address 配置来实现，然后重新启动CouchDB。

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将 bind_address = 127.0.0.1 改成 bind_address = 0.0.0.0

通过 CouchDB 的 API 来进行常规操作

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# 创建数据库 $ curl -X PUT http://localhost:5984/mydb {"ok":true}   # 查看所有数据库 $ curl -X GET http://localhost:5984/_all_dbs ["mydb"]   # 查看数据库信息 $ curl -X GET http://localhost:5984/mydb | json_reformat {     "db_name": "mydb",     "purge_seq": "0-g1AAAAFTeJzLYWBg4MhgTmEQTM4vTc5ISXIwNDLXMwBCwxygFFMeC5BkeACk_gNBViIDQbUHIGrvE6N2AUTtfmLUNkDUzsevNikBSCbVE3RrkgNIXTxhdQogdfYE1SUyJMlDFGUBAD9sXo4",     "update_seq": "0-g1AAAAFTeJzLYWBg4MhgTmEQTM4vTc5ISXIwNDLXMwBCwxygFFMiQ5L8____sxIZ8ChKUgCSSfaE1TmA1MUTVpcAUldPUF0eC5BkaABSQKXziVG7AKJ2PzFqD0DU3idG7QOIWpB7swBegl6O",     "sizes": {         "file": 33992,         "external": 0,         "active": 0     },     "other": {         "data_size": 0     },     "doc_del_count": 0,     "doc_count": 0,     "disk_size": 33992,     "disk_format_version": 7,     "data_size": 0,     "compact_running": false,     "cluster": {         "q": 8,         "n": 1,         "w": 1,         "r": 1     },     "instance_start_time": "0" }

创建文档

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1 2	$ curl -X POST http://localhost:5984/mydb -d '{"name":"kongxx", "age": 30, "sex": 1}' -H "Content-Type:application/json" {"ok":true,"id":"a10691778356d48a39f4ec6784000d2c","rev":"1-1b738f642df6eb80b3eb3e2839bbd10f"}

查看所有文档

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$ curl -X GET http://localhost:5984/mydb/_all_docs {"total_rows":1,"offset":0,"rows":[ {"id":"a10691778356d48a39f4ec6784000d2c","key":"a10691778356d48a39f4ec6784000d2c","value":{"rev":"1-1b738f642df6eb80b3eb3e2839bbd10f"}}

更新文档

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# 先查询一下文档[/b]$ curl -X GET http://localhost:5984/mydb/a10691778356d48a39f4ec6784000d2c {"_id":"a10691778356d48a39f4ec6784000d2c","_rev":"1-1b738f642df6eb80b3eb3e2839bbd10f","name":"kongxx","age":30,"sex":1}   # 更新文档，需要指定 _rev $ curl -X PUT http://localhost:5984/mydb/a10691778356d48a39f4ec6784000d2c/ -d '{"name":"kongxx", "age": 36, "sex": 1,  "_rev": "1-1b738f642df6eb80b3eb3e2839bbd10f"}' {"ok":true,"id":"a10691778356d48a39f4ec6784000d2c","rev":"2-9b552a207bbdea7e7b6ce6cb184c6f4e"}   # 更新文档后查询 $ curl -X GET http://localhost:5984/mydb/a10691778356d48a39f4ec6784000d2c {"_id":"a10691778356d48a39f4ec6784000d2c","_rev":"2-9b552a207bbdea7e7b6ce6cb184c6f4e","name":"kongxx","age":36,"sex":1}

删除文档

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# 删除文档 $ curl -X DELETE http://localhost:5984/mydb/a10691778356d48a39f4ec6784000d2c?rev=2-9b552a207bbdea7e7b6ce6cb184c6f4e {"ok":true,"id":"a10691778356d48a39f4ec6784000d2c","rev":"3-60f90d5d7f1866688cbd55833b2b8c3a"}   # 查询文档 $ curl -X GET http://localhost:5984/mydb/a10691778356d48a39f4ec6784000d2c {"error":"not_found","reason":"deleted"}

删除数据库

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1	$ curl -X DELETE http://localhost:5984/mydb[/b]{"ok":true}