"DUJWF3FDPSE

ࣗݾ঺հ w ,PIFJ4V[VLJ !FBHMFUNU w ΫοΫύουٕज़෦։ൃج൫άϧʔϓ w 3BJMTͷΞοϓάϨʔυΛ్த͔Β୲౰ w 3BJMT΁ͷΞοϓάϨʔυ࣌ʹૺ۰ͨ͠໰୊ΫοΫύο υ։ൃऀϒϩάIUUQUFDIMJGFDPPLQBEDPNFOUSZ

Ξ΢τϥΠϯ w ϦϦʔε͢Δ·Ͱ w 453*$5@"--@5"#-&4 w 384QMJUUJOH w .POLFZ1BUDI w ϦϦʔεޙ

શମతͳํ਑ w ՄೳͳݶΓ3BJMTͱͷ྆ํͰಈ͘Α͏ʹ ͢Δ w ແཧͳ৔߹͸SBJMTϒϥϯνͰมߋΛՃ͍͑ͯ͘ w ՄೳͳݶΓSBJMTϒϥϯνͷมߋ͸গͳ͘͢Δ w ϩʔϧόοΫՄೳʹ͢Δ w ηογϣϯɺΩϟογϡɺʜʜ

λΠϜϥΠϯ w ࠷ॳ͸!B@NBUTVEB͞Μ͕࡞ۀ w ๻΋࡞ۀʹՃΘΔ w ςετ͕શ෦௨ΔΑ͏ʹͳΔ w εςʔδϯά΍ຊ൪Ͱಈ࡞֬ೝ w ෛՙςετ΍࢒ͬͨόά௵͠ w ॱ࣍ϦϦʔε

ϦϦʔε w DIBOHFEpMFTXJUI BEEJUJPOTBOE EFMFUJPOT w Ұिؒͣͭॱ࣍ϦϦʔε w DPPLQBEDPN w ϞόΠϧΞϓϦ༻8FC"1* w ؅ཧը໘ɺόον

453*$5@"--@5"#-&4

.Z42-TRM@NPEF w .Z42-͕αϙʔτ͢Δ42-ߏจͱɺ.Z42-͕ ࣮ߦ͢ΔσʔλݕূʹӨڹ͢Δม਺ w σϑΥϧτͷTRM@NPEFͩͱɺҰ෦ͷόϦσʔ γϣϯΤϥʔ͕ΤϥʔͰ͸ͳ͘ܯࠂʹͳΔ

TRM@NPEF mysql> SHOW CREATE TABLE items \G *************************** 1. row *************************** Table: items Create Table: CREATE TABLE `items` ( `id` int(11) NOT NULL, `name` varchar(255) DEFAULT NULL ) ENGINE=InnoDB DEFAULT CHARSET=utf8 1 row in set (0.00 sec)

TRM@NPEF mysql> INSERT INTO items (name) VALUES ('foo'); Query OK, 1 row affected, 1 warning (0.00 sec) mysql> SHOW WARNINGS; +---------+------+-----------------------------------------+ | Level | Code | Message | +---------+------+-----------------------------------------+ | Warning | 1364 | Field 'id' doesn't have a default value | +---------+------+-----------------------------------------+ 1 row in set (0.00 sec) mysql> SELECT * FROM items; +----+------+ | id | name | +----+------+ | 0 | foo | +----+------+ 1 row in set (0.00 sec)

TRM@NPEF mysql> INSERT INTO items (id, name) VALUES (1, 'I like very much'); Query OK, 1 row affected, 1 warning (0.00 sec) mysql> SHOW WARNINGS; +---------+------ +----------------------------------------------------------------------------+ | Level | Code | Message | +---------+------ +----------------------------------------------------------------------------+ | Warning | 1366 | Incorrect string value: '\xF0\x9F\x8D\x95 v...' for column 'name' at row 1 | +---------+------ +----------------------------------------------------------------------------+ 1 row in set (0.00 sec) mysql> SELECT * FROM items; +----+---------+ | id | name | +----+---------+ | 1 | I like | +----+---------+ 1 row in set (0.00 sec)

453*$5@"--@5"#-&4 w 3BJMT͔ΒউखʹSET @@SESSION.sql_mode = 'STRICT_ALL_TABLES'͕࣮ߦ͞ΕΔΑ͏ʹ • ಉ࣌ʹ strict: false ͱ͍͏Φϓγϣϯ΋௥Ճ͞ ΕͨͷͰɺͱΓ͋͑ͣ͜ΕΛ࢖͑͹3BJMTʹ্ ͛ΒΕΔ

1BSUJBM*OTFSU w 3BJMT͔Βͷػೳ w */4&35͢Δͱ͖ʹɺσϑΥϧτ஋͔ΒมΘͬͨΧ ϥϜ͚ͩΛ*/4&35จʹೖΕΔ w IUUQTHJUIVCDPNSBJMTSBJMTDPNNJU F

1BSUJBM*OTFSU w .Z42-TRM@NPEFͱ૊Έ߹Θ͞Δͱʜ w 3BJMT w /6--͕ૠೖ͞ΕΑ͏ͱ͢ΔͷͰɺ/05/6-- ੍໿͕͋Ε͹Τϥʔ [1] pry(main)> Recipe.create (0.2ms) BEGIN SQL (0.4ms) INSERT INTO `recipes` (`title`, `user_id`) VALUES (NULL, NULL) (0.1ms) ROLLBACK ActiveRecord::StatementInvalid: Mysql2::Error: Column 'title' cannot be null: INSERT INTO `recipes` (`title`, `user_id`) VALUES (NULL, NULL)

1BSUJBM*OTFSU w 3BJMT w ஋͕লུ͞ΕΔͷͰɺ/05/6--੍໿͕͋ͬͯ ΋উखʹσϑΥϧτ஋͕ૠೖ͞ΕΔ [1] pry(main)> Recipe.create (0.2ms) BEGIN SQL (0.3ms) INSERT INTO `recipes` VALUES () (0.3ms) COMMIT => # [2] pry(main)> Recipe.last Recipe Load (0.3ms) SELECT `recipes`.* FROM `recipes` ORDER BY `recipes`.`id` DESC LIMIT 1 => #

ΫοΫύουͰͷํ਑ w 3BJMTҠߦલʹ453*$5@"--@5"#-&4ʹ͢Δ w TRM@NPEF͸ηογϣϯຖʹઃఆͰ͖Δ w ঃʑʹ453*$5@"--@5"#-&4Λ༗ޮԽ

TUSJDUNPEF΁ͷҠߦ module SetStrictSqlMode def self.enable_strict_mode?; ...; end def self.included(base) if enable_strict_mode? base.class_eval do def configure_connection_with_sql_mode configure_connection_without_sql_mode execute("SET @@SESSION.sql_mode = 'STRICT_ALL_TABLES'", :skip_logging) end alias_method_chain :configure_connection, :sql_mode end end end end ActiveSupport.on_load(:active_record) do ActiveRecord::ConnectionAdapters::Mysql2Adapter.send(:include, SetStrictSqlMode) end

TUSJDUNPEF΁ͷҠߦ w ༗ޮԽͨ͠ঢ়ଶͰςετ͕௨ΔΑ͏ʹ͢Δ w UFTU EFWFMPQNFOU TUBHJOHͰ༗ޮԽ w ຊ൪ͷBQQαʔό୆Ͱ༗ޮԽ w ΤϥʔΛ؂ࢹͭͭ͠ɺগͣͭ͠ର৅αʔόΛ֦େ w िؒ΄Ͳ͔͚ͯɺશBQQαʔόͰ༗ޮԽ

384QMJUUJOH

384QMJUUJOH w BDUT@BT@SFBEPOMZBCMF MBTUVQEBUFɺ 3BJMT Λ౰࣌࢖͍ͬͯͨ w ౰વ3BJMTͰ΋ಈ͔ͳ͍ͷͰɺຐվ଄ࡁΈ w 3BJMTͰ΋Ͱ΋ಈ࡞͢Δ38TQMJUUJOHϥ ΠϒϥϦ͕ཉ͍͠ w IUUQTHJUIVCDPNFBHMFUNUTXJUDI@QPJOU

TXJUDI@QPJOU w Կ౓͔঺հͨ͜͠ͱ͋ΔͷͰলུ w IUUQFBHMFUNUIBUFCMPKQFOUSZ w IUUQTTQFBLFSEFDLDPNFBHMFUNUGVTIV ECUPSBJMT

TXJUDI@QPJOU w "DUJWF3FDPSE΁ͷߋ৽࡞ۀதʹॻ͍ͨ w "DUJWF3FDPSEͷ಺෦ߏ଄ʹґଘͯ͠͸͍͚ͳ͍ͱ ͍͏ڧ͍ࢥ͍ w 3BJMT͔Β3BJMTCFUB·ͰͲͷόʔ δϣϯͰ΋ಈ͘

.POLFZ1BUDI

.POLFZ1BUDI w "DUJWF3FDPSEͷ಺෦࣮૷͸ ͳ͔ͥ ඇৗʹมΘ Γ΍͍͢ w ৽چͷ࣮૷Λݟൺ΂ͳ͕Βஸೡʹ௚͍ͯ͘͠࡞ۀ

.POLFZ1BUDI w ϝιουͷγάωνϟ͕มΘͬͨɺΫϥε໊͕มΘͬ ͨɺ͸Θ͔Γ΍͍͢ w த్൒୺ʹ࣮૷Λίϐϖͭͭ͠׬શʹϝιουΛ্ ॻ͖͍ͯ͠Δέʔε͕Ұ൪͠ΜͲ͍ w Ͱ͖Δ͚ͩύονΛ֎͢ํ޲Ͱ͕Μ͹Δ

.POLFZ1BUDI w ࠷ۙ͸ύονʹ৆ຯظݶΛઃఆ͢Δͷ͕ྲྀߦ

ͦͷଞ w JNQMJDJUKPJOSFGFSFODF w JODMVEFT͚ͩͰ͸KPJO͞Εͳ͘ͳͬͨ w ͳΜ͔ؔ࿈ઌͰࢦఆ͍ͯ͠ΔTDPQF͕͖͍ͯͳ͍ w ςʔϒϧ͘Β͍KPJO͢ΔͱͳΜ͔ΫΤϦ͕յ ΕΔ w TDPQFͷద༻ॱংͰͳ͔ͥมΘΔΫΤϦʜʜ

ϦϦʔεޙ

Τϥʔ w ࣄલʹεςʔδϯάͰ৭ʑಈ࡞֬ೝͯ͠ɺຊ൪ͷҰ ෦ʹࠞͥͯΤϥʔ؂ࢹΛ͍ͯͯ͠΋ɺϦϦʔεޙʹ Τϥʔ͸ग़Δ w ࣗಈςετͰ΋खಈςετͰ΋ɺΧόʔ͖͠ΕΔن ໛Ͱ͸ͳ͍ w গͳ͘ͱ΋ΫοΫύου͸

࣮ࡍʹى͖ͨΤϥʔ w 453*$5@"--@5"#-&4ىҼ w varchar(255)ʹ௕͍จࣈྻΛૠೖ͠Α͏ͱͯ͠Τ ϥʔɺ౳ʑʜʜ w Τϥʔͱ͍ͬͯ΋ɺࠓ·Ͱͷόά͕ݟ͔ͭͬͨܗ w 453*$5@"--@5"#-&4͸ઌʹ༗ޮԽ͍ͯͨ͠ͷ ͰɺϦϦʔεͷॠؒʹ͜ΕΒͷΤϥʔ͕ൃੜͨ͠Θ ͚Ͱ͸ͳ͍

εϩʔΫΤϦ w ςετɺεςʔδϯά౳Ͱ͸શ͘໰୊ແ͔͕ͬͨʜ w ຊ൪ͰϦϦʔεͯ͠͠͹Β͘ܦ͔ͬͯΒɺঃʑʹҰ ෦Ͱࠓ·ͰݟΒΕͳ͔ͬͨεϩʔΫΤϦ͕ൃੜ

03%&3#:JE"4$ w 6TFSXIFSF pSTUͷΑ͏ʹpSTUΛ࢖͏ͱɺউ खʹ03%&3#:JE"4$͕ͭ͘ w ͜Ε͕͚ͭͩ͘ͰҰ෦εϩʔΫΤϦԽ w ݟ͚ͭͨ΋ͷ͔ΒUBLF΍pOE@CZʹม͍͑ͯ͘ ࡞ۀ

όον w 8FCΞϓϦͱҧͬͯɺόον͸࣮ߦස౓ʹΑͬͯ ͸मਖ਼ϛεͷൃݟ͕େ͖͘஗ΕΔ w ि࣍όονɺ݄࣍όον w "DUJWF3FDPSEΛۦ࢖ͯ͠ෳࡶͳΫΤϦΛ૊Έཱͯ ͍ͯΔέʔε΋͋Γɺमਖ਼͕೉͍͠ w ؅ཧը໘΋ࣅͨੑ࣭Λ࣋ͭ

·ͱΊ w "DUJWF3FDPSEͷͪΐͬͱͨ͠มߋͰ.Z42-ͷ ઃఆ·ͰมΘΔ w "DUJWF3FDPSEͷ಺෦࣮૷ʹґଘͯ͠͸͍͚ͳ͍ w ͋Δఔ౓ಈ࡞֬ೝΛͨ͠Βɺࢥ͍͖ͬͯϦϦʔε͠ ͯσόοά͢Δ͔͠ͳ͍