<\/p>\n
Mo\u017cesz u\u017cy\u0107 nast\u0119puj\u0105cej sk\u0142adni, aby po\u0142\u0105czy\u0107 ci\u0105gi z dw\u00f3ch p\u00f3l w nowe pole w MongoDB:<\/span><\/p>\n Ten konkretny przyk\u0142ad \u0142\u0105czy ci\u0105gi \u201efield1\u201d i \u201efield2\u201d w nowe pole o nazwie \u201enewfield\u201d i dodaje nowe pole do kolekcji o nazwie myCollection<\/span> .<\/span><\/p>\n Poni\u017cszy przyk\u0142ad pokazuje, jak zastosowa\u0107 t\u0119 sk\u0142adni\u0119 w praktyce w przypadku<\/span> zespo\u0142u<\/span> windykacyjnego z nast\u0119puj\u0105cymi dokumentami:<\/span><\/p>\n Mo\u017cemy u\u017cy\u0107 poni\u017cszego kodu, aby po\u0142\u0105czy\u0107 ci\u0105gi z p\u00f3l \u201ezesp\u00f3\u0142\u201d i \u201ekonferencja\u201d w nowe pole o nazwie \u201eteamConf\u201d i doda\u0107 to pole do kolekcji zespo\u0142\u00f3w<\/span> :<\/span><\/p>\n Tak wygl\u0105da teraz zaktualizowana kolekcja:<\/span><\/p>\n Nale\u017cy pami\u0119ta\u0107, \u017ce ka\u017cdy dokument ma nowe pole zatytu\u0142owane \u201eteamConf\u201d, kt\u00f3re zawiera po\u0142\u0105czenie p\u00f3l \u201ezesp\u00f3\u0142\u201d i \u201ekonferencja\u201d.<\/span><\/p>\n W tym konkretnym przyk\u0142adzie zdecydowali\u015bmy si\u0119 po\u0142\u0105czy\u0107 dwa ci\u0105gi, u\u017cywaj\u0105c \u0142\u0105cznika jako separatora.<\/span><\/p>\n Mo\u017cemy jednak zdecydowa\u0107 si\u0119 na po\u0142\u0105czenie dw\u00f3ch ci\u0105g\u00f3w bez \u017cadnych warto\u015bci oddzielaj\u0105cych mi\u0119dzy nimi.<\/span><\/p>\n Poni\u017cszy kod pokazuje, jak to zrobi\u0107:<\/span><\/p>\n Oto jak b\u0119dzie wygl\u0105da\u0107 zaktualizowana kolekcja:<\/span><\/p>\n Nale\u017cy zauwa\u017cy\u0107, \u017ce nowe pole zatytu\u0142owane \u201eteamConf\u201d zawiera po\u0142\u0105czenie p\u00f3l \u201ezesp\u00f3\u0142\u201d i \u201ekonferencja\u201d bez \u017cadnej warto\u015bci rozdzielenia mi\u0119dzy nimi.<\/span><\/p>\n Uwaga<\/strong> : Pe\u0142n\u0105 dokumentacj\u0119 funkcji $concat<\/strong> mo\u017cna znale\u017a\u0107 tutaj<\/a> .<\/span><\/p>\n Poni\u017csze samouczki wyja\u015bniaj\u0105, jak wykonywa\u0107 inne typowe operacje w MongoDB:<\/span><\/p>\n MongoDB: Jak sprawdzi\u0107, czy pole zawiera ci\u0105g znak\u00f3w<\/a> Mo\u017cesz u\u017cy\u0107 nast\u0119puj\u0105cej sk\u0142adni, aby po\u0142\u0105czy\u0107 ci\u0105gi z dw\u00f3ch p\u00f3l w nowe pole w MongoDB: db.myCollection.aggregate([ { $project : { newfield: { $concat : [ ” $field1 „, ” – „, ” $field2 ” ] } } }, { $merge : „myCollection” } ]) Ten konkretny przyk\u0142ad \u0142\u0105czy ci\u0105gi \u201efield1\u201d i \u201efield2\u201d w nowe pole […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[],"class_list":["post-2752","post","type-post","status-publish","format-standard","hentry","category-przewodnik"],"yoast_head":"\n db.myCollection.aggregate([\n { $project<\/span> : { newfield: { $concat<\/span> : [ \" $field1<\/span> \", \" - \", \" $field2<\/span> \" ] } } },\n { $merge<\/span> : \"myCollection\" }\n])\n<\/strong><\/pre>\n db.teams.insertOne({team: \" Mavs<\/span> \", conference: \" Western<\/span> \", points: 31})\ndb.teams.insertOne({team: \" Spurs<\/span> \", conference: \" Western<\/span> \", points: 22})\ndb.teams.insertOne({team: \" Rockets<\/span> \", conference: \" Western<\/span> \", points: 19})\ndb.teams.insertOne({team: \" Celtics<\/span> \", conference: \" Eastern<\/span> \", points: 26})\ndb.teams.insertOne({team: \" Cavs<\/span> \", conference: \" Eastern<\/span> \", points: 33})\ndb.teams.insertOne({team: \" Nets<\/span> \", conference: \" Eastern<\/span> \", points: 38})<\/strong><\/pre>\n Przyk\u0142ad: \u0142\u0105czenie ci\u0105g\u00f3w w MongoDB<\/strong><\/span><\/h3>\n
db.teams.aggregate([\n { $project<\/span> : { teamConf: { $concat<\/span> : [ \" $team<\/span> \", \" - \", \" $conference<\/span> \" ] } } },\n { $merge<\/span> : \"teams\" }\n])<\/strong><\/pre>\n { _id: ObjectId(\"62013d8c4cb04b772fd7a90c\"),\n team: 'Mavs',\n conference: 'Western',\n points: 31,\n teamConf: 'Mavs - Western' }\n{ _id: ObjectId(\"62013d8c4cb04b772fd7a90d\"),\n team: 'Spurs',\n conference: 'Western',\n points: 22,\n teamConf: 'Spurs - Western' }\n{ _id: ObjectId(\"62013d8c4cb04b772fd7a90e\"),\n team: 'Rockets',\n conference: 'Western',\n points: 19,\n teamConf: 'Rockets - Western' }\n{ _id: ObjectId(\"62013d8c4cb04b772fd7a90f\"),\n team: 'Celtics',\n conference: 'Eastern',\n points: 26,\n teamConf: 'Celtics - Eastern' }\n{ _id: ObjectId(\"62013d8c4cb04b772fd7a910\"),\n team: 'Cavs',\n conference: 'Eastern',\n points: 33,\n teamConf: 'Cavs - Eastern' }\n{ _id: ObjectId(\"62013d8c4cb04b772fd7a911\"),\n team: 'Nets',\n conference: 'Eastern',\n points: 38,\n teamConf: 'Nets - Eastern' }<\/strong><\/pre>\n db.teams.aggregate([\n { $project<\/span> : { teamConf: { $concat<\/span> : [ \" $team<\/span> \", \" $conference<\/span> \" ] } } },\n { $merge<\/span> : \"teams\" }\n])<\/strong><\/pre>\n { _id: ObjectId(\"62013d8c4cb04b772fd7a90c\"),\n team: 'Mavs',\n conference: 'Western',\n points: 31,\n teamConf: 'MavsWestern' }\n{ _id: ObjectId(\"62013d8c4cb04b772fd7a90d\"),\n team: 'Spurs',\n conference: 'Western',\n points: 22,\n teamConf: 'SpursWestern' }\n{ _id: ObjectId(\"62013d8c4cb04b772fd7a90e\"),\n team: 'Rockets',\n conference: 'Western',\n points: 19,\n teamConf: 'RocketWestern' }\n{ _id: ObjectId(\"62013d8c4cb04b772fd7a90f\"),\n team: 'Celtics',\n conference: 'Eastern',\n points: 26,\n teamConf: 'CelticsEastern' }\n{ _id: ObjectId(\"62013d8c4cb04b772fd7a910\"),\n team: 'Cavs',\n conference: 'Eastern',\n points: 33,\n teamConf: 'CavsEastern' }\n{ _id: ObjectId(\"62013d8c4cb04b772fd7a911\"),\n team: 'Nets',\n conference: 'Eastern',\n points: 38,\n teamConf: 'NetsEastern' }<\/strong><\/pre>\n Dodatkowe zasoby<\/strong><\/span><\/h3>\n
MongoDB: Jak doda\u0107 nowe pole<\/a>
MongoDB: Jak usun\u0105\u0107 pole<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"