mysql修改表、字段、库的字符集

字符集

• 修改数据库字符集：

 ALTER DATABASE db_name DEFAULT CHARACTER SET character_name [COLLATE ...];
 
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• 把表默认的字符集和所有字符列（CHAR,VARCHAR,TEXT）改为新的字符集：

ALTER TABLE tbl_name CONVERT TO CHARACTER SET character_name [COLLATE ...]
如：ALTER TABLE logtest CONVERT TO CHARACTER SET utf8 COLLATE utf8_general_ci;
 
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• 只是修改表的默认字符集：

ALTER TABLE tbl_name DEFAULT CHARACTER SET character_name [COLLATE...];
如：ALTER TABLE logtest DEFAULT CHARACTER SET utf8 COLLATE utf8_general_ci;
 
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• 修改字段的字符集：

ALTER TABLE tbl_name CHANGE c_name c_name CHARACTER SET character_name [COLLATE ...];
如：ALTER TABLE logtest CHANGE title title VARCHAR(100) CHARACTER SET utf8 COLLATE utf8_general_ci;
 
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批量修改表字符集

SELECT
CONCAT('alter table ',table_name,' CONVERT TO CHARACTER SET utf8 COLLATE utf8_unicode_ci;')
FROM
INFORMATION_SCHEMA.tables
WHERE
TABLE_SCHEMA='flowdb'  into outfile '/usr/local/temp/1.sql';
 
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• 查看数据库编码： 
  SHOW CREATE DATABASE db_name;

• 查看表编码： 
  SHOW CREATE TABLE tbl_name;

• 查看字段编码： 
  SHOW FULL COLUMNS FROM tbl_name;