MySQL8 批量修改字符集脚本

从低版本迁移到MySQL 8后，可能由于字符集问题出现 Illegal mix of collations (utf8mb4_general_ci,IMPLICIT) and (utf8mb4_0900_ai_ci,IMPLICIT) 错误，此时要修改对象的字符集。

1. 批量修改库字符集

change_database_characset.sql

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select concat( 'alter database ' ,schema_name, ' default character set utf8mb4 collate utf8mb4_0900_ai_ci;' )    from information_schema.schemata   where schema_name not in ( 'sys' , 'mysql' , 'performance_schema' , 'information_schema' )     and lower (default_collation_name) in ( 'utf8mb4_general_ci' , 'utf8_general_ci' );

调用：

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/home/mysql/mysql-8.0.16-linux-glibc2.12-x86_64/bin/mysql -uroot -h10.0.0.18 -P3306 -p70n6w+1XklMu -N < change_database_characset.sql > change_database_characset_result.sql /home/mysql/mysql-8.0.16-linux-glibc2.12-x86_64/bin/mysql -uroot -h10.0.0.18 -P3306 -p70n6w+1XklMu -f < change_database_characset_result.sql > change_database_characset_result. out 2>&1

2. 批量修改表字符集

change_table_characset.sql

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select concat( 'alter table ' ,table_schema, '.' ,table_name, ' default character set utf8mb4 collate = utf8mb4_0900_ai_ci;' )    from information_schema.tables where table_schema not in ( 'sys' , 'mysql' , 'performance_schema' , 'information_schema' )     and table_type= 'BASE TABLE' and lower (table_collation) in ( 'utf8mb4_general_ci' , 'utf8_general_ci' );

调用：

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/home/mysql/mysql-8.0.16-linux-glibc2.12-x86_64/bin/mysql -uroot -h10.0.0.18 -P3306 -p70n6w+1XklMu -N < change_table_characset.sql > change_table_characset_result.sql /home/mysql/mysql-8.0.16-linux-glibc2.12-x86_64/bin/mysql -uroot -h10.0.0.18 -P3306 -p70n6w+1XklMu -f < change_table_characset_result.sql > change_table_characset_result. out 2>&1

3. 批量修改列字符集

change_column_characset.sql

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set group_concat_max_len=10240;   select concat(c1,c2, ';' )    from ( select c1, group_concat(c2) c2            from ( select concat( 'alter table ' ,t1.table_schema, '.' ,t1.table_name) c1,concat( ' modify ' , '`' ,t1.column_name, '` ' ,t1.data_type,                                if (t1.data_type in ( 'varchar' , 'char' ),concat( '(' ,t1.character_maximum_length, ')' ), '' ),                                ' character set utf8mb4 collate utf8mb4_0900_ai_ci' ,if(t1.is_nullable= 'NO' , ' not null' , ' null' ), ' comment ' , '' '' ,t1.column_comment, '' '' ) c2                    from information_schema.columns t1, information_schema.tables t2                   where t1.table_schema=t2.table_schema and t1.table_name=t2.table_name and t2.table_type= 'BASE TABLE'                     and lower (t1.collation_name) in ( 'utf8mb4_general_ci' , 'utf8_general_ci' ) and t1.table_schema not in ( 'sys' , 'mysql' , 'performance_schema' , 'information_schema' )) t1           group by c1) t;

调用：

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/home/mysql/mysql-8.0.16-linux-glibc2.12-x86_64/bin/mysql -uroot -h10.0.0.18 -P3306 -p70n6w+1XklMu -N < change_column_characset.sql > change_column_characset_result.sql /home/mysql/mysql-8.0.16-linux-glibc2.12-x86_64/bin/mysql -uroot -h10.0.0.18 -P3306 -p70n6w+1XklMu -f < change_column_characset_result.sql > change_column_characset_result. out 2>&1

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原文链接：https://wxy0327.blog.csdn.net/article/details/128670848