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ALTER DATABASE <database_name> CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci;
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ALTER TABLE <table_name> CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci;
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ALTER TABLE <table_name> MODIFY <column_name> VARCHAR(255) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci;
utf8mb4_0900_ai_ci ? ??? ?? :
- utf8(3???): ?? UTF-8 ???, 3??? ??.
- utf8mb4(4???, ??): ?? UTF-8 ???, ?? ??? ???? ?? 4???? ?????.
- 0900(??): ?? 9.0 ????? ?? ????? ? ??????.
- _ai_ci: ???? ??? ????? ?????.
?? ??:
- utf8_general_ci ? utf8_unicode_ci: utf8_general_ci? ?? ??? ??? ???? ??? utf8_unicode_ci? ?????.
- ??? ?? ??: ??? ???? ??? ?? ??? ?? ??? ??? ??? ???? ?????. (?? ??? ??? ??? ???? ?? ??? ???????)
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MySQL ??? ?? ??? ?? ?? ??
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TOSECIBERYNECTTOEREMOTEMYSQLSERVER, USESSHTUNNENG, CONFIGUREMYSQLFORREMOTEACCESS, SETFIREWALLRULES ? CONSIDERSSLENCRYPTION .First, SpectionANSSHTUNNELWITHSSH-L3307 : LocalHost : 3306user@remote-Server-NandConnectViamySQL-H127.0.1-P3307.second, editmys
MySQL ? ????? ??? ??? ???? ??
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MySQL? ? ????? ??? ??? ????? ?? ?? ??? ?? ???????. 1. Windows ??? : MySQL ?? ?????? ? ??? ????? (?? ??? ????? C : \ programfiles \ mysql \ mysqlserverx.x \ bin), "? ???"→ "??"→ "Advanced System ??"→ "?? ??", "??? ??", MySQlb in wors in mysqlb in wors in mysqlb in world in that the the the the the seel worl ?? ????? ?? ???? MySQL? ??????-Version Versification; 2.Macos ? Linux ??? : Bash ??? ?? ~/.bashrc ?? ~/.bash_
MySQL Workbench? ?? ??? ??? ??????
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?? ?? ??? ?? ?? MySQL ?? ?? ?? ??
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MySQL ??? ?? ??? ?? ?? ??? ?? ??? ??????. 1. ?? ?? ?? ?? ???? Slow_Query_Log ? Long_Query_Time; 2. ???? ??? ?? ??? ???? ? ????? query_time, lock_time, rows_examined? ?? ?? ??? ???? ????. 3. ??? ????? ???? ?? mysqldumpslow ?? pt-query idigest ??? ??????. 4. ??? ???? ??? ??, ??*???*, ??? ?? ?? ?? ?????. ?? ??, user_id? ???? ???? ?? ? ?? ?? ?? ??? ?? ???? ???? ? ????.
MySQL?? mysqldump? ???? ?? ??? ?????
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MySQLDump? MySQL ??????? ??? ??? ???? ???? ?????. ??????? ???? ?? ?? ? ?? ?? ???? SQL ??? ?????. 1. ?? ??? ????? ??? ?????? ??? ???? ??? SQL ???? ?????. 2. ??? ?????? ?? ??? ??? ???? TB ?? ???? ?? ???? ???? ????. 3. ???? ???-single transaction,-databases,-all-databases,-routines ?; 4. MySQL ??? ???? ?? ?? ?? ?? ?? ? ??? ?? ??? ???? ? ????. 5. ??? ????? ????? ?? ? ?? ??? ???? ?? ????.
MySQL ? ? ???? NULL ?? ?????
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MySQL?? NULL ?? ?? ? ? 1. ???? ?? ? ? ? ??? NotNull? ???? ?? ??? NULL? ?????. 2. iSnull ?? ISNOTNULL = ??! =; 3. Ifnull ?? Coalesce ??? ????? ???? ???? ? ??? ? ????. 4. ?? ?? ????? NULL ?? ?? ??? ?? ???? ??? ?? ? ORM ??? ?? ?? ?????? ??????. NULL? ???? ?? ?? ???? ??? ???? ?? ?? ?? ????. ??? ???? ??, ?? ? ???? ?? ? ??? ?? ??? ??? ?? ???????. ??? ??? ???? ??? ?? ?? ??? ????? ?? ? ????.
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MySQL? ?? ????? ?????? ?? ??? ?????. 1. MySQL ?? ??, sudosystemctlstopmysql ?? sudosystemctlstopmysqld? ??????. 2. -skip-grant-tables ???? mysql? ???? sudomysqld-skip-grant-tables &; 3. MySQL? ????? ?? SQL ??? ???? FlushPrivileges; Alteruser'Root '@'localHost'IndifiedBy'Your_new? ?? ??? ?? ????? ??????.
Windows ?? ?????? MySQL ??? ???? ??
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MySQL ??? ????? Windows ?? ?????? ?? ???? ??? ? ????. 1. ?? ?? ???? ????, MySQL? ??????-Version ?? MySQL-V; 2. MySQL ?????? ??? ? ? SelectVersion () ;; 3. ?? ??? ?? ???? ???? MySQL ? ????? ???? mysql.exe- version? ??????. ? ??? ?? ????? ????, ?? ? ??? ?? ????? ????, ? ?? ??? ?? ??? ???? ?? ??? ?????.
