ORMの選び方（Android編）

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1. ORMͷબͼํ ~ Androidฤ ~ #potatotips 2016/03/16 @__gfx__

2. ࣗݾ঺հ • Engineer at eBook Initiative Japan • Android Engineer

   • Recent Works: Android ORM, Static Gson, Robolectric-Instrumentation • rebuild.fm/133 ͰAndroid Nͷ࿩Λͨ͠
3. None

4. ORM for Android • ͍·͍ͪϕετϓϥΫςΟε͕ఆ·Βͳ͍ྖҬ • ੲ͸ʮ࢖͍΍͢͞ͷActiveAndroidʯͱʮ଎౓ͷ GreenDAOʯ͘Β͍͔͠બ୒ࢶ͕ͳ͔ͬͨ • ࠓ͸΄͔ʹDBFlow,

   Requery, OrmaͳͲଟ਺ • NoSQLͷRealm΋ORMػೳΛ΋ͭDBͱͯ͠஫໨͞Ε ͍ͯΔ

5. ORMʹٻΊΔ΋ͷ • ଎౓: ϦϑϨΫγϣϯ͸஗͍ɻίʔυੜ੒͢΂͖ • ϚΠάϨʔγϣϯ: ϚΠάϨʔγϣϯ͕ͭΒ͍ͱ ؾܰʹ࢖͑ͳ͍ɻΧϥϜͷ௥Ճ͘Β͍ࣗಈͰ΍ͬ ͯ͘Ε •

   ؆୯: ੍໿Λ՝͞ͳ͍͜ͱʢe.g. ಛఆͷεʔύʔ Ϋϥε͕ඞཁʣɺίʔυิ׬ͱͷ૬ੑͷΑ͞

6. ଎౓ • AA: ϦϑϨΫγϣϯ࢖༻ɻ஗͍ • DBFlow, Orma: ίʔυੜ੒ɻ଎͍ • Realm:

   ಠࣗDB࣮૷ɻ଎͍ ※ ͳ͓Realm͸ߴ଎ͱ͍ΘΕΔ͕ɺOrma΍DBFlowͱ ͘Β΂Δͱʮ଎͍έʔε͕͋Δʯͱ͍͏ఔ౓

7. ϚΠάϨʔγϣϯ • खͰϚΠάϨʔγϣϯίʔυΛॻ͖ͨ͘ͳ͍ w ""WFSTJPOTRMʹ42-Λॻ͘ w %#'MPXBEE$PMVNO -POHDMBTT UJNFTUBNQ

   w 0SNBϦωʔϜҎ֎͸ίʔυෆཁ w 3FBMNBEE'JFME JE MPOHDMBTT

8. ؆୯͞(1): Ϟσϧͷ੍໿ • ActiveAndroid΍Realm͸ModelΫϥεΛܧঝ͢Δඞཁ͕͋Γɺ JSON serializeͳͲͰϋϚΔ • AA͸উखʹprimary keyΛ͚ͭͯϋϚΔ •

   Orma, Requery͸੍໿ͳ͠ɺDBFlow͸ΠϯλʔϑΣΠεͷ࣮૷ ΛٻΊΔ ※ ҎલͷRelamϞσϧ͸ϝιουΛఆٛͰ͖ͳ͍ͳͲͷ੍໿͕͋ͬ ͕ͨɺv0.88Ͱ΄ͱΜͲղফ͞Εͨ

9. ؆୯͞(2): ΫΤϦϏϧμ • ίʔυίϯϓϦʔτͱͷ૬ੑΛߟ͑Δ • ""OFX4FMFDU GSPN *UFNDMBTT XIFSF OBNF

   +BDL • %#'MPX 42-JUFTFMFDU GSPN *UFNDMBTT XIFSF *UFN@5BCMFOBNFFR +BDL • 0SNBPSNBTFMFDU'SPN*UFN OBNF&R +BDL • 3FBMNSFBMNXIFSF *UFNDMBTT FRVBMT OBNF +BDL

10. ݁࿦ • AAΛ࢖͏ཧ༝͸ͳ͍ • Orma͸·͋·͋ΠέͯΔ • DBFlow΋ͳ͔ͳ͔Α͍ɻϚΠάϨʔγϣϯ͠ͳ͍ͳ Β • Realm΋0.88͔Β͍ͩͿΑ͘ͳͬͨɻϚΠάϨʔγϣ

    ϯ͠ͳ͍ͳΒ

11. OrmaͷΠέͯͳ͍ͱ͜Ζ • ރΕͯͳ͍ʢ։ൃΛ͸͡Ίͯ3ϲ݄͘Β͍ʣ • ෳࡶͳΫΤϦΛߏஙͰ͖ͳ͍ • has-one, has-many, many-to-manyͳͲͷ associationsͷαϙʔτ͕ශऑ

    • ίʔυੜ੒ܥҰൠͷ࿩ͱͯ͠ɺίϯύΠϧΤϥʔʹ ͳͬͨͱ͖ʹؔ܎ͳ͍Τϥʔ͕େྔʹग़ͯͭΒ͍

12. ͓·͚: APK sizes • Normal App: 0.85MiB • Orma App:

    0.97MB • Realm App: 5.30MB https://github.com/gfx/ORM-APK-Size-Example

13. https://github.com/gfx/Android-Orma