{"id":4721,"date":"2018-03-06T04:43:47","date_gmt":"2018-03-06T12:43:47","guid":{"rendered":"https:\/\/www.couchbase.com\/blog\/?p=4721"},"modified":"2023-10-20T10:19:51","modified_gmt":"2023-10-20T17:19:51","slug":"5-common-forums-questions","status":"publish","type":"post","link":"https:\/\/www.couchbase.com\/blog\/pt\/5-common-forums-questions\/","title":{"rendered":"As 5 perguntas mais comuns do f\u00f3rum"},"content":{"rendered":"

Como fazer \"algo\" no N1QL?<\/b><\/h3>\n

Em primeiro lugar, <\/span>Se voc\u00ea n\u00e3o estiver familiarizado com o N1QL, recomendo que dedique alguns minutos ao nosso treinamento gratuito sobre N1QL <\/span>aqui<\/span><\/a>ou simplesmente brincar com ele <\/span>aqui<\/span><\/a>.<\/span><\/p>\n

Em segundo lugar, como se trata de uma pergunta ampla, vamos analisar alguns cen\u00e1rios comuns:<\/span><\/p>\n

 <\/p>\n

Selecione o ID de um documento e todos os seus atributos:<\/b><\/h4>\n
Select meta(t).id as id, t.* from `myBucket` t where type = 'someType'<\/pre>\n
<\/h4>\n
Como escrever um JOIN:<\/b><\/h4>\n
Vamos consultar quais empresas voam do aeroporto de S\u00e3o Francisco (SFO) para qualquer lugar do mundo usando o exemplo de viagem:<\/span><\/p>\n
SELECT \u00a0airline.name, airline.callsign, route.destinationairport, route.stops, route.airline\r\nFROM `travel-sample` route JOIN `travel-sample` airline ON KEYS route.airlineid\r\nWHERE route.type = \"route\"\r\nAND airline.type = \"airline\"\r\nAND route.sourceairport = \"SFO\"\r\nAND route.stops = 0\r\nORDER BY airline.name<\/pre>\n
O <\/span>JUNTAR<\/i><\/b> se parece com um SQL JOIN padr\u00e3o, a \u00fanica diferen\u00e7a aqui \u00e9 a cl\u00e1usula <\/span>SOBRE AS CHAVES <\/i><\/b>palavra-chave, para ler mais sobre ela <\/span>Confira este artigo que explica visualmente os JOINs N1QL<\/span><\/a>. O Couchbase 5.5 tamb\u00e9m adicionar\u00e1 suporte a ANSI JOINs<\/a><\/span><\/p>\n
Como selecionar itens de uma matriz:<\/b><\/h4>\n
Documentos fornecidos como:<\/span><\/p>\n
{\r\n  type: \u201cperson\u201d,\r\n  name: \u201cJohn\u201d,\r\n  children: [\r\n    {\r\n      \u201cname\u201d: \u201cPedro\u201d,\r\n      \u201cage\u201d: 8\r\n    },\r\n    {\r\n       \u201cname\u201d: \u201cGeorge\u201d,\r\n       \u201cage\u201d: 11\r\n    }\r\n  ]\r\n}<\/pre>\n
Se quisermos selecionar todas as crian\u00e7as com mais de 10 anos de idade, podemos usar o comando IN\u00daTIL<\/strong> palavra-chave: <\/span><\/p>\n
SELECT c.* FROM tutorial t UNNEST t.children c WHERE c.age > 10<\/pre>\n
 <\/p>\n
 <\/p>\n
Por que minha consulta est\u00e1 lenta?<\/b><\/h3>\n
Provavelmente, sua consulta n\u00e3o est\u00e1 atingindo nenhum \u00edndice. Voc\u00ea pode verificar isso executando a consulta com a op\u00e7\u00e3o <\/span>explicar<\/i><\/b> da seguinte forma:<\/span><\/p>\n
\"\"<\/span><\/p>\n
Como voc\u00ea pode ver na imagem acima, a consulta est\u00e1 atingindo o <\/span>PrimaryScan<\/i><\/b> o que significa que ele est\u00e1 usando o \u00edndice prim\u00e1rio. A cria\u00e7\u00e3o de um \u00edndice secund\u00e1rio para ele possivelmente resolver\u00e1 seu problema:<\/span><\/p>\n
\"\"<\/p>\n
Ao executar a mesma consulta novamente, o resultado ser\u00e1 algo como:<\/span><\/p>\n
\"\"<\/p>\n
Se a sua consulta j\u00e1 estiver atingindo um \u00edndice, mas ainda tiver um desempenho ruim, talvez seja melhor adicionar um \u00edndice mais otimizado (<\/span>como neste exemplo<\/span><\/a>). Se voc\u00ea n\u00e3o estiver familiarizado com <\/span>como criar um \u00edndice<\/span>, <\/span>d\u00ea uma olhada nesta postagem do blog<\/span><\/a><\/p>\n
 <\/p>\n
Como paginar os resultados no N1QL?<\/b><\/h3>\n
Voc\u00ea pode usar <\/span>LIMITE<\/i><\/b> e <\/span>DESLOCAMENTO<\/i><\/b>:<\/span><\/p>\n
select * from `travel-sample` where country = 'United States' OFFSET 10 LIMIT 10<\/pre>\n
Confira <\/span>este tutorial<\/span><\/a> para ler mais sobre o assunto.\u00a0<\/span>Al\u00e9m disso, se voc\u00ea estiver usando o Spring Data, poder\u00e1 adicionar um <\/span>Pagin\u00e1vel<\/i><\/b> ao final da defini\u00e7\u00e3o de seu m\u00e9todo:<\/span><\/p>\n
\"\"<\/p>\n
E ent\u00e3o, em seu servi\u00e7o, voc\u00ea pode usar o <\/span>Solicita\u00e7\u00e3o de p\u00e1gina<\/i><\/b> objeto:<\/span><\/p>\n
\"\"<\/p>\n
 <\/p>\n
Minha consulta tem resultados ausentes\/errados<\/b><\/h3>\n
Por padr\u00e3o, o Couchbase suporta <\/span>leitura ap\u00f3s a escrita<\/span><\/i> sempre que voc\u00ea obt\u00e9m um documento por sua chave, mas seus \u00edndices e exibi\u00e7\u00f5es s\u00e3o atualizados de forma ass\u00edncrona por meio do Data Change Protocol (DCP). Portanto, se voc\u00ea estiver executando uma consulta logo ap\u00f3s uma grava\u00e7\u00e3o, ela poder\u00e1 ser executada antes que as exibi\u00e7\u00f5es\/\u00edndices tenham a chance de ser atualizados.<\/span><\/p>\n
O Couchbase tem tudo a ver com velocidade, e ningu\u00e9m tem tempo para esperar at\u00e9 que todos os \u00edndices e exibi\u00e7\u00f5es sejam atualizados para enviar a resposta de volta ao cliente de que uma grava\u00e7\u00e3o foi executada com \u00eaxito.<\/span><\/p>\n
Mas h\u00e1 poucos cen\u00e1rios em que a consist\u00eancia forte entre as grava\u00e7\u00f5es e as consultas \u00e9 realmente necess\u00e1ria. Nesses casos, voc\u00ea pode especificar por meio do SDK que deseja esperar at\u00e9 que o \u00edndice\/visualiza\u00e7\u00e3o que est\u00e1 usando seja atualizado:<\/span><\/p>\n
\"\"<\/p>\n
Para saber mais sobre consist\u00eancia de varredura, consulte a se\u00e7\u00e3o <\/span>documenta\u00e7\u00e3o oficial<\/span><\/a>.<\/span><\/p>\n
Em minha experi\u00eancia pessoal, o \u00fanico cen\u00e1rio em que preciso de consist\u00eancia entre grava\u00e7\u00f5es e consultas \u00e9 durante o <\/span>testes de integra\u00e7\u00e3o<\/i><\/b><\/a> que \u00e9 quando voc\u00ea realmente insere os dados e os consulta logo em seguida. <\/span><\/p>\n
 <\/p>\n
Como criar\/usar \u00edndices de matriz.<\/b><\/h3>\n
Esse \u00e9 um t\u00f3pico interessante, pois <\/span>indexa\u00e7\u00e3o de matriz<\/i><\/b> pode acelerar significativamente seu desempenho. Ent\u00e3o, digamos que temos a seguinte estrutura de documento:<\/span><\/p>\n
{\r\n\u00a0\u00a0\u00a0\"address\": \"Capstone Road, ME7 3JE\",\r\n\u00a0\u00a0\u00a0\"alias\": null,\r\n\u00a0\u00a0\u00a0\"city\": \"Medway\",\r\n\u00a0\u00a0\u00a0\"country\": \"United Kingdom\",\r\n\u00a0\u00a0\u00a0\"description\": \"40 bed summer hostel about 3 miles from Gillingham, housed in a districtive converted Oast House in a semi-rural setting.\",\r\n\u00a0\u00a0\u00a0\"directions\": null,\r\n\u00a0\u00a0\u00a0\"email\": null,\r\n\u00a0\u00a0\u00a0\"fax\": null,\r\n\u00a0\u00a0\u00a0 \u2026\r\n\u00a0\u00a0\u00a0\"id\": 10025,\r\n\u00a0\u00a0\u00a0\"name\": \"Medway Youth Hostel\",\r\n\u00a0\u00a0\u00a0\"pets_ok\": true,\r\n\u00a0\u00a0\u00a0\"phone\": \"+44 870 770 5964\",\r\n\u00a0\u00a0\u00a0\"price\": null,\r\n\u00a0\u00a0\u00a0\"reviews\": [\r\n\u00a0\u00a0\u00a0\u00a0\u00a0{\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\"author\": \"Ozella Sipes\",\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\"content\": \"Some review here\u2026\u201d,\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\"date\": \"2013-06-22 18:33:50 +0300\",\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\"ratings\": {\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\"Cleanliness\": 5,\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\"Location\": 4,\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\"Overall\": 4,\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\"Rooms\": 3,\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\"Service\": 5,\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\"Value\": 4\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}\r\n     }\r\n   ]\r\n}<\/pre>\n
Agora, se precisarmos consultar as avalia\u00e7\u00f5es de hot\u00e9is, podemos fazer algo como:<\/span><\/p>\n
SELECT c.* FROM `travel-sample` t UNNEST t.reviews c where t.type == \"hotel\" limit 100<\/pre>\n
Portanto, o \u00edndice mais simples para o <\/span>revis\u00f5es<\/i><\/b> matriz <\/span>vontade<\/span> se parece com o seguinte:<\/span><\/p>\n
CREATE INDEX idx ON `travel-sample` (reviews) WHERE type = \"hotel\";<\/pre>\n
E ent\u00e3o, quando executamos a consulta, voil\u00e0:<\/span><\/p>\n
\"\"<\/p>\n
Ele est\u00e1 usando o \u00edndice criado recentemente.<\/span><\/p>\n
Para obter mais exemplos, consulte o <\/span>documenta\u00e7\u00e3o oficial<\/span><\/a> ou leia <\/span>este excelente artigo<\/span><\/a> sobre como otimizar os \u00edndices de matriz.<\/span><\/p>\n
 <\/p>","protected":false},"excerpt":{"rendered":"
How to do \u201csomething\u201d in N1QL? First of all, if you are not familiar with N1QL I highly recommend you to spend a few minutes in our free N1QL training here, \u00a0or just play with it here. Second, as it […]<\/p>","protected":false},"author":8754,"featured_media":13873,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[1],"tags":[],"ppma_author":[9059],"class_list":["post-4721","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized"],"acf":[],"yoast_head":"\nThe 5 Most Common Forum's Questions - 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\/5-common-forums-questions\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"The 5 Most Common Forum's Questions\" \/>\n<meta property=\"og:description\" content=\"How to do \u201csomething\u201d in N1QL? First of all, if you are not familiar with N1QL I highly recommend you to spend a few minutes in our free N1QL training here, \u00a0or just play with it here. Second, as it […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.couchbase.com\/blog\/pt\/5-common-forums-questions\/\" \/>\n<meta property=\"og:site_name\" content=\"The Couchbase Blog\" \/>\n<meta property=\"article:published_time\" content=\"2018-03-06T12:43:47+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2023-10-20T17:19:51+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.couchbase.com\/blog\/wp-content\/uploads\/2018\/03\/explain-query-correct-1024x778.png\" \/>\n<meta name=\"author\" content=\"Denis Rosa, Developer Advocate, Couchbase\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@deniswsrosa\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Denis Rosa, Developer Advocate, Couchbase\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"4 minutos\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.couchbase.com\/blog\/5-common-forums-questions\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.couchbase.com\/blog\/5-common-forums-questions\/\"},\"author\":{\"name\":\"Denis Rosa, Developer Advocate, Couchbase\",\"@id\":\"https:\/\/www.couchbase.com\/blog\/#\/schema\/person\/fe3c5273e805e72a5294611a48f62257\"},\"headline\":\"The 5 Most Common Forum’s Questions\",\"datePublished\":\"2018-03-06T12:43:47+00:00\",\"dateModified\":\"2023-10-20T17:19:51+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.couchbase.com\/blog\/5-common-forums-questions\/\"},\"wordCount\":602,\"commentCount\":0,\"publisher\":{\"@id\":\"https:\/\/www.couchbase.com\/blog\/#organization\"},\"image\":{\"@id\":\"https:\/\/www.couchbase.com\/blog\/5-common-forums-questions\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/www.couchbase.com\/blog\/wp-content\/uploads\/sites\/1\/2022\/11\/couchbase-nosql-dbaas.png\",\"articleSection\":[\"Uncategorized\"],\"inLanguage\":\"pt-BR\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/www.couchbase.com\/blog\/5-common-forums-questions\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.couchbase.com\/blog\/5-common-forums-questions\/\",\"url\":\"https:\/\/www.couchbase.com\/blog\/5-common-forums-questions\/\",\"name\":\"The 5 Most Common Forum's Questions - 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