{"id":34734,"date":"2019-10-31T22:00:06","date_gmt":"2019-10-31T19:00:06","guid":{"rendered":"https:\/\/prohoster.info\/blog\/sravnenie-i-vybor-sistem-migratsii-dannyh\/"},"modified":"2019-10-31T22:00:06","modified_gmt":"2019-10-31T19:00:06","slug":"sravnenie-i-vybor-sistem-migratsii-dannyh","status":"publish","type":"post","link":"https:\/\/prohoster.info\/et\/blog\/administrirovanie\/sravnenie-i-vybor-sistem-migratsii-dannyh","title":{"rendered":"Andmete migratsioonis\u00fcsteemide v\u00f5rdlemine ja valimine","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<h2>Andmete migratsioonis\u00fcsteemide v\u00f5rdlemine ja valimine<\/h2>\n<p>\n<img decoding=\"async\" alt=\"Andmete migratsioonis\u00fcsteemide v\u00f5rdlemine ja valimine\" src=\"\/wp-content\/uploads\/2019\/05\/a25cc01b8d86b233a6d21caddb169fec.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nAndmete mudel arendamise protsessis muutub ja mingil hetkel ei vasta see enam andmebaasile. Muidugi saab andmebaasi kustutada ning ORM loob uue versiooni, mis vastab mudelile, kuid selline protseduur toob endaga kaasa olemasolevate andmete kaotuse. Seet\u00f5ttu seisneb s\u00fcsteemi migreerimise funktsioon selles, et skeemi muutumise korral s\u00fcnkroonida see rakenduse andmemudeliga ilma olemasolevaid andmeid kaotamata.<\/p>\n<p>K\u00e4esolevas artiklis soovime tutvuda erinevate t\u00f6\u00f6riistadega andmebaasi migreerimise haldamiseks. Loodame, et see \u00fclevaade on kasulik arendajatele, kes seisavad silmitsi sellise valikuga.<br \/>\n<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><\/p>\n<h3>\u00dclesanne<\/h3>\n<p>\nMeie ettev\u00f5ttes k\u00e4ib aktiivne j\u00e4rgmise genereerimise toote arendamine \u2013 Docs Security Suite (DSS). Serveripool on kirjutatud .Net Core'is ja andmebaasina kasutatakse loomulikult Entity Framework Core'i. Rakenduse projekteerimisel kasutame l\u00e4henemist Code First.<\/p>\n<p>Rakenduse domeenimudelit loovad mitmed arendajad \u00fcheaegselt \u2013 iga\u00fcks vastutab oma loogilise osa s\u00fcsteemist. <\/p>\n<p>Eelmises DSS-i p\u00f5lvkonnas kasutati migratsioonide haldamiseks klassikalist Entity Framework Migrations (EF 6). Siiski on sellele kogunenud teatud etteheiteid, peamine neist on see, et EF-il puudub m\u00f5istlik l\u00e4henemisviis versioonikonfliktide lahendamisele. See fakt teeb meid endiselt kurvaks vigade parandamise k\u00e4igus toe raames, seet\u00f5ttu otsustati kaaluda alternatiivseid v\u00f5imalusi.<\/p>\n<p>Arutelu tulemusena kujunesid j\u00e4rgmised n\u00f5uded migratsioonihalduse s\u00fcsteemile:<\/p>\n<ol>\n<li>Toetab erinevaid andmebaasihalduss\u00fcsteeme. Kohustuslikult MS SQL Server, PostgreSQL, Oracle, kuid potentsiaalselt on v\u00f5imalik kasutada ka teisi.<\/li>\n<li>T\u00f6\u00f6 ORM-iga. Algselt oli plaan kasutada EF Core'i, kuid projekteerimise etapis oldi valmis kaaluma ka teisi ORM-e.<\/li>\n<li>Migratsioonide automaatne genereerimine. Arvestades Code First arendust, sooviks v\u00e4ltida vajadust migratsioone \"k\u00e4ega\" kirja panna.<\/li>\n<li>Versioonide konfliktid. Jaotatud arenduse tingimustes v\u00f5ib EF Core merge'i k\u00e4igus kokku puutuda konfliktidega. See muutub suureks probleemiks, kuna rakenduse erinevaid osi loovad erinevad arendajad, mist\u00f5ttu kulub iga\u00fchega tegelemiseks palju aega.<\/li>\n<li>Arendatud dokumentatsioon ja tugi. Siin ei vaja me arvatavasti selgitusi.<\/li>\n<li>Tasuta. Kriteerium on tinglik, kuna oleme valmis kaaluma ka mitte liiga kalliseid s\u00fcsteeme v\u00f5i v\u00e4ga kalliseid, kuid mugavuse poolest ideaalseid.<\/li>\n<\/ol>\n<p>\nV\u00e4ikese uuringu tulemuseks leiti ja tunnistati soovitavateks j\u00e4rgmised valikud:<\/p>\n<ol>\n<li>EF Core Migrations<\/li>\n<li>DBup<\/li>\n<li>RoundhousE<\/li>\n<li>ThinkingHome.Migrator<\/li>\n<li>Fluent Migrator <\/li>\n<\/ol>\n<p><\/p>\n<h3>N\u00fc\u00fcd veidi p\u00f5hjalikumalt<\/h3>\n<p>\n<img decoding=\"async\" alt=\"Andmete migratsioonis\u00fcsteemide v\u00f5rdlemine ja valimine\" src=\"\/wp-content\/uploads\/2019\/05\/4cb242f230b19073626e36a472dcea50.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<b><noindex><a rel=\"nofollow\" href=\"https:\/\/docs.microsoft.com\/ru-ru\/ef\/core\/managing-schemas\/migrations\/\">EntityFramework Core Migrations<\/a><\/noindex><\/b><\/p>\n<p>Muidugi oli see esimene ja peamine valik. Kohalik t\u00f6\u00f6riist, mis t\u00f6\u00f6tab otse v\u00e4lja kastist ilma igasuguste keerutusteta. Palju dokumentatsiooni, nii ametlikku kui ka mitte, lihtsus jne. Siiski on klassikalistele EF-i puudustele esitatud pretensioonid t\u00e4iesti asjakohased ka EF Core'i puhul. <\/p>\n<p>Seega on EF Core'i jaoks v\u00e4lja toodud plusstid:<\/p>\n<ul>\n<li>Microsofti tugi, dokumentatsioon, sealhulgas vene keeles, tohutu kogukond.<\/li>\n<li>Koodist genereeritud migreerimised<\/li>\n<li>Kui EF 6-s salvestati andmebaasi hetkeseis, siis EF Core'is seda enam ei tehta. EF Core'iga t\u00f6\u00f6tades ei ole enam vajalik andmebaasi v\u00e4lja pakkuda, kui kasutatakse Code First'i.<\/li>\n<li>Kuna alustame Code First'ist, siis on v\u00f5imalus hallata \u00fchte migreerimist k\u00f5igi vajalike andmebaasi juurdep\u00e4\u00e4suteenuste jaoks.<\/li>\n<li>Toetatakse nii PostgreSQL-i kui Oracle'i jne. ning isegi \u2013 MS SQL Serverit \ud83d\ude0a.<\/li>\n<\/ul>\n<p>\n Samuti on puudused:<\/p>\n<ul>\n<li>Konfliktide lahendamine on sama tasemel. On vajalik migreerimiste j\u00e4rjestuse kehtestamine ja andmebaasi hetkeseisude uuendamine.<\/li>\n<li>Migratsioonide genereerimise mudelite s\u00f5ltuvus.<\/li>\n<\/ul>\n<p>\n<b>DbUp<\/b><\/p>\n<p><img decoding=\"async\" alt=\"Andmete migratsioonis\u00fcsteemide v\u00f5rdlemine ja valimine\" src=\"\/wp-content\/uploads\/2019\/05\/02a47718c7b4c618c204c2273b4de50c.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<noindex><a rel=\"nofollow\" href=\"https:\/\/dbup.github.io\/\">dbup.github.io<\/a><\/noindex><\/p>\n<p>DbUp on .NET-i teek, mis installitakse NuGet'i kaudu ning aitab SQL Serveris muudatusi rakendada. See j\u00e4lgib, millised muudatuste skriptid on juba t\u00e4idetud, ja k\u00e4ivitab need, mis on vajalikud andmebaasi uuendamiseks. Teek on v\u00e4lja kasvanud avatud l\u00e4htekoodiga blogimootori projektist ASP.NET-is ja eksisteerib MIT litsentsi all, kood on saadaval GitHubis. Migratsioonid on kirjeldatud T-SQL-i abil.<\/p>\n<p>Millised on eelised:<\/p>\n<ul>\n<li>Toetatakse suurt hulka andmebaasimootoreid (MS SQL Server, PostgreSQL, MySQL).<\/li>\n<li>Kuna skriptid on kirjutatud T-SQL-is, n\u00e4evad need \u00fcsna lihtsad v\u00e4lja.<\/li>\n<li>Konflikte lahendatakse ka SQL abil<\/li>\n<\/ul>\n<p>\nAga miinused:<\/p>\n<ul>\n<li>Kuigi toetatakse suurt hulka andmebaase, ei kuulu Oracle nende hulka<\/li>\n<li>Ei t\u00f6\u00f6ta ORM-iga<\/li>\n<li>T-SQL skriptide kirjutamine k\u00e4sitsi \u2013 ei ole see, mida me otsisime <\/li>\n<li>Dokumentatsioon ja kogukond on keskp\u00e4rased, kuigi SQL-skriptide kirjutamise tingimustes v\u00f5ivad need olla mitte vajalikud.<\/li>\n<\/ul>\n<p>\n<b>RoundhousE<\/b><\/p>\n<p><img decoding=\"async\" alt=\"Andmete migratsioonis\u00fcsteemide v\u00f5rdlemine ja valimine\" src=\"\/wp-content\/uploads\/2019\/05\/ca418187d64e75830b2643dea794c6d0.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/chucknorris\/roundhouse\">github.com\/chucknorris\/roundhouse<\/a><\/noindex><\/p>\n<p>See migreerimise haldust\u00f6\u00f6riist, mida levitatakse Apache 2.0 litsentsi all, t\u00f6\u00f6tab nagu eelmine T-SQL migratsiooni mootoril. Tundub, et arendajad keskendusid tehniliste probleemide lahendusele andmebaaside toetuse osas, mitte mugava arendusprotsessi loomisele.<\/p>\n<p>Plussid:<\/p>\n<ul>\n<li>Toetab vajalikud andmebaasid (sealhulgas Oracle)<\/li>\n<\/ul>\n<p>\nMiinused:<\/p>\n<ul>\n<li>Oracle (ja samuti meile mitteaktiivne Access) ei toimi .NET Core peal, ainult .NET Full Framework'il<\/li>\n<li>Ei t\u00f6\u00f6ta ORM-iga<\/li>\n<li>Dokumentatsioon on veel v\u00e4hem kui eelmisel t\u00f6\u00f6riistal<\/li>\n<li>Taaskord - migratsioonid kirjutatakse skriptidega<\/li>\n<\/ul>\n<p>\n<b>ThinkingHome.Migrator<\/b><\/p>\n<p><img decoding=\"async\" alt=\"Andmete migratsioonis\u00fcsteemide v\u00f5rdlemine ja valimine\" src=\"\/wp-content\/uploads\/2019\/05\/c530e23f8c9c27ed1d53f3dce710eb70.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nVersioonide migreerimise t\u00f6\u00f6riist andmebaasi skeemi jaoks .NET Core platvormile, mida levitatakse MIT litsentsi all. <noindex><a rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/414867\/\">Arendaja r\u00e4\u00e4kis oma viimase versiooni kohta peaaegu aasta tagasi<\/a><\/noindex>. <\/p>\n<p>Plussid:<\/p>\n<ul>\n<li>Kohandatud .NET Core jaoks<\/li>\n<li>Olenematu migreerimise haruline jada on rakendatud<\/li>\n<li>Migrationide logimine on ellu viidud<\/li>\n<\/ul>\n<p>\nMiinused:<\/p>\n<ul>\n<li>Viimane uuendus \u2013 aasta tagasi. Tundub, et projekt ei ole enam toetatud<\/li>\n<li>Oracle ei ole toetatud (artikkel m\u00e4rgib, et see on tingitud stabiilse rakenduse puudumisest .NET Core'i jaoks \u2013 kuid see oli aasta tagasi)<\/li>\n<li>Migratsioonide automaatne genereerimine puudub<\/li>\n<\/ul>\n<p>\nKokkuv\u00f5ttes n\u00e4eb projekt paljut\u00f5otav v\u00e4lja, eriti kui see oleks edasi arenenud, kuid meil tuli siin ja kohe otsus langetada.<\/p>\n<p><b>Fluent Migrator<\/b><\/p>\n<p><img decoding=\"async\" alt=\"Andmete migratsioonis\u00fcsteemide v\u00f5rdlemine ja valimine\" src=\"\/wp-content\/uploads\/2019\/05\/def2f7b9ecd8084975add75ded1a7a71.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/fluentmigrator\/fluentmigrator\">github.com\/fluentmigrator\/fluentmigrator<\/a><\/noindex><\/p>\n<p>K\u00f5ige populaarsem migratsioonit\u00f6\u00f6riist, millel on suur j\u00e4lgijaskond. Levitatakse Apache 2.0 litsentsi alusel. Kirjelduses on m\u00e4rgitud, et see on migratsiooniplatvorm .NET-ile, sarnane Ruby on Railsi migratsioonidele. Andmebaasi skeemimuudatused on kirjeldatud C# klassides.<\/p>\n<p>Siin on m\u00f5ned eelised:<\/p>\n<ul>\n<li>Toetab vajalikke DBMS-e<\/li>\n<li>Toetab .NET Core'i<\/li>\n<li>Suure arenenud kogukond<\/li>\n<li>Migratsioonide konfliktid lahendatakse j\u00e4rjekindlalt \u2013 migratsioonidel on m\u00e4\u00e4ratud teostamise j\u00e4rjekord. Lisaks, kui konflikt tekib \u00fche \u00fcksuse \u00fcmber, lahendatakse selle \u00fchendamise k\u00e4igus sama moodi nagu muus koodis.<\/li>\n<li>On olemas profiilid, mis t\u00e4idetakse p\u00e4rast migrationi edukat l\u00f5petamist. Need v\u00f5ivad sisaldada teenusefunktsioone. Viimane v\u00e4rskendus oli kuu aega tagasi, mis t\u00e4hendab, et projekt on aktiivne.<\/li>\n<\/ul>\n<p>\nMis puudutab miinuseid, siis siin need on:<\/p>\n<ul>\n<li>Migratsioonide automaatne genereerimine puudub<\/li>\n<li>Puudub seos EF mudelitega.<\/li>\n<li>Puuduvad andmebaasi pildid.<\/li>\n<\/ul>\n<p><\/p>\n<h3>Kuidas meie valik v\u00e4lja n\u00e4gi?<\/h3>\n<p>\n<img decoding=\"async\" alt=\"Andmete migratsioonis\u00fcsteemide v\u00f5rdlemine ja valimine\" src=\"\/wp-content\/uploads\/2019\/05\/db6953bf80bbbf9f560e39b32c32752c.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nK\u00f5ige tulisemad vaidlused keerlesid kahe parameetri \u00fcmber \u2013 migratsioonide automaatne genereerimine ja m\u00f5istlik lahendus konfliktide lahendamiseks. \u00dclej\u00e4\u00e4nud tegurid olid oluliselt v\u00e4hem hirmutavad. L\u00f5puks otsustas meeskond arutelu tulemusena kasutada uues projektis Fluent Migratorit. Konfliktide lahendamine toob tulevikus palju rohkem eeliseid.<\/p>\n<h4>J\u00e4reldused<\/h4>\n<p>\nLoomulikult pole ideaalseid t\u00f6\u00f6riistu. Ka meie valikul tuli seada prioriteete meie \u00absoovides\u00bb. Siiski v\u00f5ivad teiste meeskondade ja teiste \u00fclesannete jaoks olla otsustavad ka teised tegurid. Loodame, et see artikkel aitab teil teha \u00f5ige valiku.<br \/>\n<br \/>Allikas: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/company\/crosstech\/blog\/453930\/\">habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0421\u0440\u0430\u0432\u043d\u0435\u043d\u0438\u0435 \u0438 \u0432\u044b\u0431\u043e\u0440 \u0441\u0438\u0441\u0442\u0435\u043c \u043c\u0438\u0433\u0440\u0430\u0446\u0438\u0438 \u0434\u0430\u043d\u043d\u044b\u0445 \u041c\u043e\u0434\u0435\u043b\u044c \u0434\u0430\u043d\u043d\u044b\u0445 \u0432 \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u0435 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u043a\u0438 \u0438\u043c\u0435\u0435\u0442 \u0441\u0432\u043e\u0439\u0441\u0442\u0432\u043e \u0438\u0437\u043c\u0435\u043d\u044f\u0442\u044c\u0441\u044f, \u0438 \u0432 \u043a\u0430\u043a\u043e\u0439-\u0442\u043e \u043c\u043e\u043c\u0435\u043d\u0442 \u043e\u043d\u0430 \u043f\u0435\u0440\u0435\u0441\u0442\u0430\u0435\u0442 \u0441\u043e\u043e\u0442\u0432\u0435\u0442\u0441\u0442\u0432\u043e\u0432\u0430\u0442\u044c \u0431\u0430\u0437\u0435 \u0434\u0430\u043d\u043d\u044b\u0445. \u041a\u043e\u043d\u0435\u0447\u043d\u043e \u0436\u0435, \u0411\u0414 \u043c\u043e\u0436\u043d\u043e \u0443\u0434\u0430\u043b\u0438\u0442\u044c, \u0438 \u0442\u043e\u0433\u0434\u0430 ORM \u0441\u043e\u0437\u0434\u0430\u0441\u0442 \u043d\u043e\u0432\u0443\u044e \u0432\u0435\u0440\u0441\u0438\u044e, \u043a\u043e\u0442\u043e\u0440\u0430\u044f \u0431\u0443\u0434\u0435\u0442 \u0441\u043e\u043e\u0442\u0432\u0435\u0442\u0441\u0442\u0432\u043e\u0432\u0430\u0442\u044c \u043c\u043e\u0434\u0435\u043b\u0438, \u043d\u043e \u0442\u0430\u043a\u0430\u044f \u043f\u0440\u043e\u0446\u0435\u0434\u0443\u0440\u0430 \u043f\u0440\u0438\u0432\u0435\u0434\u0435\u0442 \u043a \u043f\u043e\u0442\u0435\u0440\u0435 \u0441\u0443\u0449\u0435\u0441\u0442\u0432\u0443\u044e\u0449\u0438\u0445 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