{"id":2507,"date":"2017-02-08T12:50:16","date_gmt":"2017-02-08T12:50:16","guid":{"rendered":"https:\/\/www.couchbase.com\/blog\/?p=2507"},"modified":"2025-10-09T07:10:44","modified_gmt":"2025-10-09T14:10:44","slug":"developer-release-curl-n1ql","status":"publish","type":"post","link":"https:\/\/www.couchbase.com\/blog\/pt\/developer-release-curl-n1ql\/","title":{"rendered":"Vers\u00e3o para desenvolvedores do Couchbase - Coloque um pouco de cURL em seu N1QL"},"content":{"rendered":"

O que \u00e9 cURL?<\/span><\/h2>\n

Voc\u00ea j\u00e1 ouviu falar em cURL? \u00c9 uma famosa ferramenta de linha de comando para enviar\/receber dados usando a sintaxe de URL, diz a wikipedia <\/span>aqui<\/span><\/a>. Vamos come\u00e7ar com um exemplo relacionado ao Couchbase. O servi\u00e7o de consulta N1QL est\u00e1 dispon\u00edvel por meio de uma API REST. Se voc\u00ea quiser executar uma consulta N1QL com o cURL, e supondo que o servi\u00e7o de consulta esteja ativado no localhost, ela ter\u00e1 a seguinte apar\u00eancia:<\/span><\/p>\n

curl https:\/\/localhost:8093\/query\/service -d 'statement=SELECT * FROM default LIMIT 1'<\/span><\/p>\n

Ou, se voc\u00ea quiser executar uma consulta de texto completo, fa\u00e7a algo como<\/span><\/p>\n

curl -XPOST -H \"Content-Type: application\/json\" https:\/\/localhost:8094\/api\/index\/beer\/query -d '{\"explain\": true, \"fields\": [\"*\"], \"highlight\": {}, \"query\": {\"query\": \"pale ale\"}}'<\/span><\/p>\n

No momento, n\u00e3o h\u00e1 nada espec\u00edfico sobre N1QL<\/a>\u00e9 apenas um exemplo de chamada de API REST com cURL. Ent\u00e3o, por que esse t\u00edtulo? Bem, \u00e9 porque voc\u00ea pode chamar o cURL a partir de uma consulta N1QL.<\/span><\/p>\n

cURL() em N1QL<\/span><\/h2>\n

curl() \u00e9 uma nova fun\u00e7\u00e3o N1QL que permite acessar dados JSON externos em um ponto de extremidade remoto (geralmente HTTP(s)). Semelhante a outras fun\u00e7\u00f5es N1QL, essa fun\u00e7\u00e3o pode ser usada em v\u00e1rias express\u00f5es N1QL e em v\u00e1rias cl\u00e1usulas das consultas SELECT\/DML (proje\u00e7\u00e3o, where, from etc.). Quando usada na cl\u00e1usula from, a invoca\u00e7\u00e3o curl() deve resultar em um conjunto\/cole\u00e7\u00e3o de documentos JSON.<\/span><\/p>\n

Esse assunto j\u00e1 foi amplamente abordado em <\/span>DZone<\/span><\/a>Convido voc\u00ea a l\u00ea-lo, assim como a muitos outros artigos da DZone <\/span>postagens<\/span><\/a> sobre o N1QL e escrito pela equipe do N1QL.<\/span><\/p>\n

Podemos come\u00e7ar, como qualquer pessoa faz ao experimentar um novo idioma, com um SELECT muito simples:<\/span><\/p>\n

SELECT CURL(\"GET\", \"https:\/\/maps.googleapis.com\/maps\/api\/geocode\/json\", {\"data\": \"address=santa+cruz&components=country:ES&key=YOUR_API_KEY\"});<\/span><\/p>\n

Isso lhe dar\u00e1 o seguinte resultado JSON:<\/span><\/p>\n

\r\n[\r\n  {\r\n    \"results\": [\r\n      {\r\n        \"address_components\": [\r\n          {\r\n            \"long_name\": \"Santa Cruz de Tenerife\",\r\n            \"short_name\": \"Santa Cruz de Tenerife\",\r\n            \"types\": [\r\n              \"locality\",\r\n              \"political\"\r\n            ]\r\n          },\r\n          {\r\n            \"long_name\": \"Santa Cruz de Tenerife\",\r\n            \"short_name\": \"TF\",\r\n            \"types\": [\r\n              \"administrative_area_level_2\",\r\n              \"political\"\r\n            ]\r\n          },\r\n          {\r\n            \"long_name\": \"Canary Islands\",\r\n            \"short_name\": \"CN\",\r\n            \"types\": [\r\n              \"administrative_area_level_1\",\r\n              \"political\"\r\n            ]\r\n          },\r\n          {\r\n            \"long_name\": \"Spain\",\r\n            \"short_name\": \"ES\",\r\n            \"types\": [\r\n              \"country\",\r\n              \"political\"\r\n            ]\r\n          }\r\n        ],\r\n        \"formatted_address\": \"Santa Cruz de Tenerife, Spain\",\r\n        \"geometry\": {\r\n          \"bounds\": {\r\n            \"northeast\": {\r\n              \"lat\": 28.487616,\r\n              \"lng\": -16.2356646\r\n            },\r\n            \"southwest\": {\r\n              \"lat\": 28.4280248,\r\n              \"lng\": -16.3370045\r\n            }\r\n          },\r\n          \"location\": {\r\n            \"lat\": 28.4636296,\r\n            \"lng\": -16.2518467\r\n          },\r\n          \"location_type\": \"APPROXIMATE\",\r\n          \"viewport\": {\r\n            \"northeast\": {\r\n              \"lat\": 28.487616,\r\n              \"lng\": -16.2356646\r\n            },\r\n            \"southwest\": {\r\n              \"lat\": 28.4280248,\r\n              \"lng\": -16.3370045\r\n            }\r\n          }\r\n        },\r\n        \"place_id\": \"ChIJcUElzOzMQQwRLuV30nMUEUM\",\r\n        \"types\": [\r\n          \"locality\",\r\n          \"political\"\r\n        ]\r\n      }\r\n    ]\r\n  }\r\n]\r\n<\/code><\/pre>\n
H\u00e1 muitas informa\u00e7\u00f5es aqui e talvez voc\u00ea esteja interessado apenas em obter as coordenadas do endere\u00e7o identificado. Isso \u00e9 f\u00e1cil de fazer. Basta tratar o resultado da fun\u00e7\u00e3o cURL como qualquer outro objeto JSON:<\/span><\/p>\n
SELECT CURL(\"GET\", \"https:\/\/maps.googleapis.com\/maps\/api\/geocode\/json\", {\"data\": \"address=santa+cruz&components=country:ES&key=YOUR_API_KEY\"}).results[0].geometry ;<\/span><\/p>\n
E isso retornar\u00e1 exatamente o que voc\u00ea queria:<\/span><\/p>\n
\r\n[\r\n  {\r\n    \"geometry\": {\r\n      \"bounds\": {\r\n        \"northeast\": {\r\n          \"lat\": 28.487616,\r\n          \"lng\": -16.2356646\r\n        },\r\n        \"southwest\": {\r\n          \"lat\": 28.4280248,\r\n          \"lng\": -16.3370045\r\n        }\r\n      },\r\n      \"location\": {\r\n        \"lat\": 28.4636296,\r\n        \"lng\": -16.2518467\r\n      },\r\n      \"location_type\": \"APPROXIMATE\",\r\n      \"viewport\": {\r\n        \"northeast\": {\r\n          \"lat\": 28.487616,\r\n          \"lng\": -16.2356646\r\n        },\r\n        \"southwest\": {\r\n          \"lat\": 28.4280248,\r\n          \"lng\": -16.3370045\r\n        }\r\n      }\r\n    }\r\n  }\r\n]\r\n<\/code><\/pre>\n
Embora isso seja muito bom, atualmente n\u00e3o h\u00e1 nenhum v\u00ednculo com seus dados. Vamos supor que voc\u00ea tenha um documento com um endere\u00e7o, mas sem coordenadas geogr\u00e1ficas. Agora voc\u00ea pode adicionar essas coordenadas com a seguinte consulta N1QL:<\/span><\/p>\n
ATUALIZA\u00c7\u00c3O<\/span>amostra de viagem<\/span>USE KEYS \"myDocumentWithoutCoordinates\" SET geo = CURL(\"GET\", \"https:\/\/maps.googleapis.com\/maps\/api\/geocode\/json\", {\"data\": \"address=santa+cruz&components=country:ES&key=YOUR_API_KEY\"}).results[0].geometry returning *<\/span><\/p>\n
E agora voc\u00ea acabou de modificar um documento existente com base em um servi\u00e7o externo com uma consulta N1QL :)<\/span><\/p>\n
Aqui est\u00e1 outro exemplo. A mesma consulta FTS de antes, mas como a cl\u00e1usula FROM de uma consulta N1QL:<\/span><\/p>\n
SELECT result.total_hits, array_length(result.hits) FROM curl(\"POST\", \"https:\/\/localhost:8094\/api\/index\/beer\/query\",{\"header\": \"Content-Type: application\/json\", \"data\":{\"explain\":true, \"fields\": [\"*\"], \"highlight\": {}, \"query\": {\"query\": \"pale ale\"}}} }) result;<\/span><\/p>\n
E isso lhe dar\u00e1:<\/span><\/p>\n
[ { \"$1\": 10, \"total_hits\": 3815 } ]<\/span><\/p>\n
Agora voc\u00ea sabe que pode executar uma pesquisa de texto completo (ou qualquer chamada para qualquer URL que retorne JSON) e usar todas as vantagens do N1QL para obter uma boa proje\u00e7\u00e3o desses dados JSON. De certa forma, isso nos permite integrar o FTS ao N1QL. Como \u00e9 poss\u00edvel usar o cURL em uma cl\u00e1usula FROM, voc\u00ea pode, por exemplo, unir o resultado a um bucket.<\/span><\/p>\n
Aqui est\u00e1 outro exemplo com esse esp\u00edrito, usando nossa amostra tradicional de cerveja que cont\u00e9m cervejas e documentos de cervejarias. Primeiro, transformamos a consulta anterior para obter a lista de IDs dos documentos que cont\u00eam \"pale ale\":<\/span><\/p>\n
\r\nSELECT hit.id FROM \r\n  curl(\"POST\",\"https:\/\/localhost:8094\/api\/index\/beer\/query\",\r\n    {\"header\":\"Content-Type: application\/json\",\r\n    \"data\":{\"explain\":true,\"fields\": [\"*\"],\"highlight\": {},\"query\": {\"query\": \"pale ale\"}}\r\n    }) result \r\n  UNNEST result.hits AS hit\r\n\r\n[\r\n  {\r\n    \"id\": \"stone_brewing_co-stone_pale_ale\"\r\n  },\r\n  {\r\n    \"id\": \"sierra_nevada_brewing_co-sierra_nevada_pale_ale\"\r\n  },\r\n  {\r\n    \"id\": \"yards_brewing-yards_philadelphia_pale_ale\"\r\n  },\r\n  {\r\n    \"id\": \"cooper_s_cave_ale_company-cooper_s_cave_pale_ale\"\r\n  },\r\n  {\r\n    \"id\": \"tommyknocker_brewery_and_pub-pick_axe_pale_ale\"\r\n  },\r\n  {\r\n    \"id\": \"bell_s_brewery_inc-pale_ale\"\r\n  },\r\n  {\r\n    \"id\": \"flying_dog_brewery-classic_pale_ale\"\r\n  },\r\n  {\r\n    \"id\": \"appalachian_brewing_company-hoppy_trails_india_pale_ale\"\r\n  },\r\n  {\r\n    \"id\": \"mogollon_brewing_company-superstition_pale_ale\"\r\n  },\r\n  {\r\n    \"id\": \"the_church_brew_works-pipe_organ_pale_ale\"\r\n  }\r\n]\r\n<\/code><\/pre>\n
Para saber mais sobre essa consulta do FTS e o que voc\u00ea pode fazer em geral com a API REST do FTS, consulte a se\u00e7\u00e3o <\/span>documenta\u00e7\u00e3o atual<\/span><\/a>.<\/span><\/p>\n
Agora temos uma lista de IDs de documentos do FTS que podemos usar facilmente:<\/span><\/p>\n
SELECT beers.* FROM curl(\"POST\", \"https:\/\/localhost:8094\/api\/index\/beer\/query\", {\"header\": \"Content-Type: application\/json\", \"data\":{\"explain\":true, \"fields\": [\"*\"], \"highlight\": {}, \"query\": {\"query\": \"pale ale\"}}} }) result UNNEST result.hits AS hit JOIN beer-sample beers ON KEYS hit.id<\/span><\/p>\n
N\u00e3o \u00e9 legal? Mas voc\u00ea n\u00e3o precisa se limitar a consultar o Couchbase, voc\u00ea pode usar fontes externas. Aqui est\u00e1 outro exemplo. Voc\u00ea encontrar\u00e1 muitos conjuntos de dados JSON interessantes em <\/span>cat\u00e1logo.dados.gouv<\/span><\/a>. Voc\u00ea pode, por exemplo, dar uma olhada no <\/span>Nomes de beb\u00eas mais populares por sexo e grupo \u00e9tnico da m\u00e3e na cidade de Nova York<\/span><\/a>. \u00c9 um arquivo JSON grande, com muitas linhas, 13962 linhas, como voc\u00ea pode ver na execu\u00e7\u00e3o:<\/span><\/p>\n
SELECT count(row) FROM CURL(\"GET\", \"https:\/\/data.cityofnewyork.us\/api\/views\/25th-nujf\/rows.json?accessType=DOWNLOAD\") result UNNEST result.data AS row<\/span><\/p>\n
E se voc\u00ea quiser um top 10 do nome fornecido, poder\u00e1 executar a seguinte consulta:<\/span><\/p>\n
SELECT row FROM CURL(\"GET\", \"https:\/\/data.cityofnewyork.us\/api\/views\/25th-nujf\/rows.json?accessType=DOWNLOAD\") result UNNEST result.data AS row ORDER BY TONUMBER(row[13]) ASC, TONUMBER(row[12]) DESC LIMIT 10<\/span><\/p>\n
Parece que Jayden e Isabella s\u00e3o nomes muito populares em Nova York atualmente :)<\/span><\/p>\n
A partir desses exemplos, voc\u00ea pode ver que a linguagem de consulta N1QL \u00e9 uma maneira inovadora de descobrir o que h\u00e1 dentro de um grande arquivo JSON. Basicamente, voc\u00ea pode mapear um ponto de extremidade JSON para um banco de dados :) E, \u00e9 claro, h\u00e1 outras possibilidades que ainda n\u00e3o mencionamos, como o uso de JOINs em um bucket do Couchbase e um endpoint JSON.<\/span><\/p>\n
Documenta\u00e7\u00e3o<\/span><\/h2>\n
Atualmente, n\u00e3o oferecemos suporte a todos os recursos do cURL. No entanto, ele deve cobrir o b\u00e1sico e ser utiliz\u00e1vel no momento. Aqui est\u00e1 a lista de op\u00e7\u00f5es que suportamos at\u00e9 o momento. A fun\u00e7\u00e3o curl recebe at\u00e9 tr\u00eas par\u00e2metros:<\/span><\/p>\n
1 - O primeiro par\u00e2metro \u00e9 o verbo HTTP usado. At\u00e9 o momento, oferecemos suporte a \"GET\" e \"POST\".<\/span><\/p>\n
2 - O segundo par\u00e2metro \u00e9 o URL do ponto de extremidade<\/span><\/p>\n
3 - O terceiro par\u00e2metro representa diferentes op\u00e7\u00f5es de cURL.<\/span><\/p>\n
Op\u00e7\u00f5es de seguran\u00e7a<\/span><\/h3>\n
\n\n\n\n\n\n\n\n
\n
Op\u00e7\u00e3o<\/span><\/p>\n<\/td>\n
\n
Descri\u00e7\u00e3o<\/span><\/p>\n<\/td>\n
\n
valor<\/span><\/p>\n<\/td>\n<\/tr>\n
\n
usu\u00e1rio<\/span><\/p>\n<\/td>\n
\n
Usu\u00e1rio e senha do servidor<\/span><\/p>\n<\/td>\n
\n
NOME DE USU\u00c1RIO[:SENHA]<\/span><\/p>\n<\/td>\n<\/tr>\n
\n
b\u00e1sico<\/span><\/p>\n<\/td>\n
\n
Usar autentica\u00e7\u00e3o b\u00e1sica de HTTP<\/span><\/p>\n<\/td>\n
\n
—<\/span><\/p>\n<\/td>\n<\/tr>\n
\n
inseguro \u00a0\u00a0\u00a0\u00a0\u00a0<\/span><\/p>\n<\/td>\n
\n
Permitir conex\u00f5es com sites SSL sem certificados (H)<\/span><\/p>\n<\/td>\n
\n
—<\/span><\/p>\n<\/td>\n<\/tr>\n
\n
anyauth<\/span><\/p>\n<\/td>\n
\n
curl para descobrir o m\u00e9todo de autentica\u00e7\u00e3o por si s\u00f3 e usar o mais seguro (no nosso caso, ser\u00e1 apenas o b\u00e1sico por enquanto. Eventualmente, daremos suporte ao digest)<\/span><\/p>\n<\/td>\n
\n
—<\/span><\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n
Outras op\u00e7\u00f5es relacionadas \u00e0 transfer\u00eancia<\/span><\/h3>\n
\n\n\n\n\n\n\n\n\n\n\n\n
\n
Op\u00e7\u00e3o<\/span><\/p>\n<\/td>\n
\n
Descri\u00e7\u00e3o<\/span><\/p>\n<\/td>\n
\n
valor<\/span><\/p>\n<\/td>\n<\/tr>\n
\n
Tempo limite de conex\u00e3o<\/span><\/p>\n<\/td>\n
\n
Tempo m\u00e1ximo permitido para conex\u00e3o<\/span><\/p>\n<\/td>\n
\n
SEGUNDOS<\/span><\/p>\n<\/td>\n<\/tr>\n
\n
tempo m\u00e1ximo<\/span><\/p>\n<\/td>\n
\n
Tempo m\u00e1ximo permitido para a transfer\u00eancia<\/span><\/p>\n<\/td>\n
\n
SEGUNDOS<\/span><\/p>\n<\/td>\n<\/tr>\n
\n
dados \u00a0\u00a0\u00a0\u00a0<\/span><\/p>\n<\/td>\n
\n
Dados HTTP POST (H)<\/span><\/p>\n<\/td>\n
\n
DADOS<\/span><\/p>\n<\/td>\n<\/tr>\n
\n
cabe\u00e7alho \u00a0\u00a0<\/span><\/p>\n<\/td>\n
\n
Passar LINE de cabe\u00e7alho personalizado para o servidor (H)<\/span><\/p>\n<\/td>\n
\n
LINHA<\/span><\/p>\n<\/td>\n<\/tr>\n
\n
show-error<\/span><\/p>\n<\/td>\n
\n
Mostrar erro. Com -s, fa\u00e7a com que CURL() mostre os erros quando eles ocorrerem<\/span><\/p>\n<\/td>\n
<\/td>\n<\/tr>\n
\n
silencioso<\/span><\/p>\n<\/td>\n
\n
Modo silencioso (n\u00e3o emite nada)<\/span><\/p>\n<\/td>\n
\n
—<\/span><\/p>\n<\/td>\n<\/tr>\n
\n
M\u00e1ximo de vermelhos \u00a0<\/span><\/p>\n<\/td>\n
\n
N\u00famero m\u00e1ximo de redirecionamentos permitidos (H)<\/span><\/p>\n<\/td>\n
\n
N\u00daMERO<\/span><\/p>\n<\/td>\n<\/tr>\n
\n
keepalive-time<\/span><\/p>\n<\/td>\n
\n
Aguarde SEGUNDOS entre as sondas keepalive<\/span><\/p>\n<\/td>\n
\n
SEGUNDOS<\/span><\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n
 <\/p>\n
Gostar\u00edamos muito de saber o que voc\u00ea pensa sobre esse recurso. Como voc\u00ea o usaria? Est\u00e1 faltando alguma coisa? Estamos aguardando seus coment\u00e1rios abaixo.<\/span><\/p>","protected":false},"excerpt":{"rendered":"
What is cURL? Ever heard of cURL? It\u2019s a famous command line tool for sending\/receiving data using URL syntax, says wikipedia here. Let\u2019s start with an example related to Couchbase. The N1QL query service is available through a REST API. […]<\/p>","protected":false},"author":49,"featured_media":2549,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[2165,1812],"tags":[],"ppma_author":[9023],"class_list":["post-2507","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-full-text-search","category-n1ql-query"],"acf":[],"yoast_head":"\nCouchbase Developer Release - Put some cURL in your N1QL - The Couchbase Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.couchbase.com\/blog\/pt\/developer-release-curl-n1ql\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Couchbase Developer Release - Put some cURL in your N1QL\" \/>\n<meta property=\"og:description\" content=\"What is cURL? 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