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GoでBigQueryを操作する時にStructを使うか悩んでる話/go-bigquery...
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Shoichiro Nagai(shnagai)
August 22, 2023
Technology
1
200
GoでBigQueryを操作する時にStructを使うか悩んでる話/go-bigquery-struct-worries
【HRBrain x コネヒト合同開催】Let's Go Talk #10 でLTした資料です。
https://connehito.connpass.com/event/290692/
Shoichiro Nagai(shnagai)
August 22, 2023
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Transcript
(PͰ#JH2VFSZΛૢ࡞͢Δ࣌ʹ 4USVDUΛ͏͔ΜͰΔ ʲ)3#SBJOYίωώτ߹ಉ։࠵ʳ-FUT(P5BML ӬҪউҰ
ࣗݾհ ओͳ׆ಈ ίωώτΤϯδχΞϒϩάIUUQTUFDIDPOOFIJUPDPNBSDIJWFBVUIPSOBHBJT աڈͷొஃࢿྉɹɹɹɹɹIUUQTTQFBLFSEFDLDPNTIPJDIJSPO ίωώτגࣜձࣾ ։ൃ෦/EM @shnagai ӬҪউҰ
(PͰ$-*πʔϧΛ࡞Δͱ͖ʹ 4USVDUΛ͏͖͔ΜͩͷͰ ࠓճΧδϡΞϧʹޠΓ·͢
࡞ͬͨ$-*πʔϧͷཁ݅ w #JH2VFSZʹ͋ΔσʔλΛ4ʹΞοϓϩʔυ͢Δ w #JH2VFSZʹ42-ൃߦͯ݁͠Ռऔಘ w ݁ՌΛϑΝΠϧʹग़ྗ w ϑΝΠϧΛ4ͷಛఆόέοτʹΞοϓϩʔυ
1ZUIPOͰQBOEBT͏ͱ͜Μͳ؆୯ʹ
8IZ(P w -FU`T(Pͱ͍͏ઓུΛςοΫϏδϣϯͰܝ͓͛ͯΓɺ ձࣾͱͯ͠(Pͷར༻Λਪਐ͍ͯ͠Δ w Ұൠతͳ(Pͷར w ϫϯόΠφϦϙϯͷັྗ w
ҰൠతʹΫϩεϓϥοτϑΥʔϜରԠ
͏ύοέʔδ w DMPVEHPPHMFDPNHPCJHRVFSZΛ͑#2ૢ࡞༰қ w ϑΝΠϧૢ࡞$47ॻ͖ࠐΈඪ४ύοέʔδͰ
ࠓճͷςʔϚͱͳΔ͏Ұͭͷ݅ w ύλʔϯͷҟͳΔσʔλΛѻ͏ඞཁ͕͋Δ w ΧϥϜ͕ͦΕͧΕҟͳΔ ઃܭʜ w σʔλϚʔτͱͯ͠#JH2VFSZͷϏϡʔʹϩδοΫ࣮ w
ݩʑखಈͰσʔλऔಘ͍ͯͨ͠ͷͰϏϡʔʹϩδοΫΛ͍࣋ͨͤͯͨ w ෳࡶͳ42-ෆཁͰɺϏϡʔͷσʔλΛͯ࣋ͬͯ͘͢Ε0, TFMFDU Ͱ0, w 42-ͷ݁ՌΛ4USVDUʹ٧ΊࠐΉ͔Μͩ
࣮ύλʔϯ
<>CJHRVFSZ7BMVFΛ͏ w ͭͷߦͷ֤ྻͷΛॱ൪ʹ֨ೲ͢ΔͨΊͷεϥΠε w ֤ɺ#JH2VFSZͷσʔλܕʹԠͯ͡దͳ(PͷجຊܕʢJOUɺGMPBUɺTUSJOHͳ Ͳʣʹม͞ΕΔɻ εϥΠεͷi൪ͷཁૉʹ ߦͷi൪ͷྻΛૠೖ ΫΤϦ݁ՌΛߦ୯ҐͰऔಘ͢Δ ϙΠϯλܕ
https://pkg.go.dev/cloud.google.com/go/bigquery#Value https://pkg.go.dev/cloud.google.com/go/bigquery#RowIterator
4USVDUͰಠࣗσʔλܕΛఆٛ BigQueryͷΧϥϜ໊ʹ ରԠ͢ΔܗͰϑΟʔϧυ໊Λఆٛ εΩʔϚͷ֤ྻɺେจࣈখจࣈΛແࢹ͠ ͯɺಉ໊͡લΛ࣋ͭߏମͷΤΫεϙʔτ ͞ΕͨϑΟʔϧυͱর߹͞ΕΔ
ͲͪΒ͕͍͍ͷ͔ॻ͖ͳ͕Β໎ͬͨ w ίʔυͷՄಡੑ4USVDU͏ύλʔϯ͕ѹతʹߴ͍ w ͨͩ͠ύλʔϯఆٛͯ͠ࠓޙ૿͍͑ͯ͘͜ͱߟ͑ΔͱͦΕͰ͍͍ͷ͔ w ൚༻తͳπʔϧͱͯ͠࡞ΔͳΒ<>CJHRVFSZ7BMVFͰܕม͢Δܗ͕ ศརͦ͏ w
42-ΛҾͰ͢ͱTʹΞοϓϩʔυͯ͘͠ΕΔπʔϧతͳΠϝʔδ w ѻͬͯΔσʔλͷਖ਼͠͞ίʔυ্͔ΒΘ͔Βͳ͍͕ɺͦͷ#JH2VFSZͷ Ϗϡʔʹ͋Δ͔Βͳ͍ͷͰ w $-*πʔϧͱͯͬͪ͜͠ͷ࡞Γͷ΄͏͕͍͚ͯΔΑͶ
ͲͪΒ͕͍͍ͷ͔ॻ͖ͳ͕Β໎ͬͨ w ੩తܕ͚ݴޠͷಛੑ׆͔͢ͳΒ4USVDU͏ͷ͕CFUUFS ͔ w 4USVDUΛ͍ෳͷϝιουΛ࡞Δͱ͔Ͱ͋ΕԸܙ͋ Δ͕ɺࠓճDTWग़ྗͷΈ͕ٻΊΒΕΔ͔ΒΦʔόʔ͔
ࠓͷͱ͜Ζͷࣗͷ݁ w ࠓճͷέʔεͰ4USVDUΘͳ͍அΛͨ͠ w σʔλૢ࡞͕ܾ·͍ͬͯΔɺ͔ͭ$-*πʔϧͱͯ͠ͷ֦ு ੑ͕ͳ͘ͳΔ͕ܾΊख w อकੑՄಡੑ4USVDU͏ύλʔϯͷ΄͏͕ߴ͍ͱײ ͍ͯ͡ΔͷͰຖ·͞Εͦ͏Ͱ͋Δ
ͲͪΒ͕ਖ਼ղ͔ ͬͱ͍͍ํ๏͋Δͷ͔ ·͕ͩ͑ग़ͣͳͷͰ ͥͻ࠙ձͰ͓͠·͠ΐ͏