如何将整个MySQL数据库字符集转换为UTF-8和排序为UTF-8?
当前回答
mysqldump -uusername -ppassword -c -e --default-character-set=utf8 --single-transaction --skip-set-charset --add-drop-database -B dbname > dump.sql
cp dump.sql dump-fixed.sql
vim dump-fixed.sql
:%s/DEFAULT CHARACTER SET latin1/DEFAULT CHARACTER SET utf8 COLLATE utf8_general_ci/
:%s/DEFAULT CHARSET=latin1/DEFAULT CHARSET=utf8/
:wq
mysql -uusername -ppassword < dump-fixed.sql
其他回答
你也可以使用数据库工具Navicat,这样做更容易。
湿 婆。
右键单击您的数据库,并在下拉菜单中选择数据库属性和更改
在命令行shell上
如果你是一个命令行shell,你可以非常快地做到这一点。只需填写“dbname”:D
DB="dbname"
(
echo 'ALTER DATABASE `'"$DB"'` CHARACTER SET utf8 COLLATE utf8_general_ci;'
mysql "$DB" -e "SHOW TABLES" --batch --skip-column-names \
| xargs -I{} echo 'ALTER TABLE `'{}'` CONVERT TO CHARACTER SET utf8 COLLATE utf8_general_ci;'
) \
| mysql "$DB"
简单复制/粘贴的一行程序
DB="dbname"; ( echo 'ALTER DATABASE `'"$DB"'` CHARACTER SET utf8 COLLATE utf8_general_ci;'; mysql "$DB" -e "SHOW TABLES" --batch --skip-column-names | xargs -I{} echo 'ALTER TABLE `'{}'` CONVERT TO CHARACTER SET utf8 COLLATE utf8_general_ci;' ) | mysql "$DB"
对于有大量表的数据库,你可以使用一个简单的php脚本来更新数据库和所有表的字符集,使用以下方法:
$conn = mysqli_connect($host, $username, $password, $database);
if ($conn->connect_error) {
die("Connection failed: " . $conn->connect_error);
}
$alter_database_charset_sql = "ALTER DATABASE ".$database." CHARACTER SET utf8 COLLATE utf8_unicode_ci";
mysqli_query($conn, $alter_database_charset_sql);
$show_tables_result = mysqli_query($conn, "SHOW TABLES");
$tables = mysqli_fetch_all($show_tables_result);
foreach ($tables as $index => $table) {
$alter_table_sql = "ALTER TABLE ".$table[0]." CONVERT TO CHARACTER SET utf8 COLLATE utf8_unicode_ci";
$alter_table_result = mysqli_query($conn, $alter_table_sql);
echo "<pre>";
var_dump($alter_table_result);
echo "</pre>";
}
你可以创建sql来更新所有的表:
SELECT CONCAT("ALTER TABLE ",TABLE_SCHEMA,".",TABLE_NAME," CHARACTER SET utf8 COLLATE utf8_general_ci; ",
"ALTER TABLE ",TABLE_SCHEMA,".",TABLE_NAME," CONVERT TO CHARACTER SET utf8 COLLATE utf8_general_ci; ")
AS alter_sql
FROM information_schema.TABLES
WHERE TABLE_SCHEMA = "your_database_name";
捕获输出并运行它。
阿诺德•丹尼尔斯(Arnold Daniels)的回答更为优雅。
最安全的方法是先将列修改为二进制类型,然后使用所需的字符集将其修改回二进制类型。
每种列类型都有其各自的二进制类型,如下所示:
>二进制 文本=> BLOB 丁文字=> TINYBLOB 文本=> memblob LONGTEXT => LONGBLOB VARCHAR => VARBINARY
Eg.:
ALTER TABLE [TABLE_SCHEMA].[TABLE_NAME] MODIFY [COLUMN_NAME] VARBINARY;
ALTER TABLE [TABLE_SCHEMA].[TABLE_NAME] MODIFY [COLUMN_NAME] VARCHAR(140) CHARACTER SET utf8mb4;
我尝试了几个拉丁表,它保留了所有的变音符。
你可以为所有列提取这个查询:
SELECT
CONCAT('ALTER TABLE ', TABLE_SCHEMA,'.', TABLE_NAME,' MODIFY ', COLUMN_NAME,' VARBINARY;'),
CONCAT('ALTER TABLE ', TABLE_SCHEMA,'.', TABLE_NAME,' MODIFY ', COLUMN_NAME,' ', COLUMN_TYPE,' CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci;')
FROM information_schema.columns
WHERE TABLE_SCHEMA IN ('[TABLE_SCHEMA]')
AND COLUMN_TYPE LIKE 'varchar%'
AND (COLLATION_NAME IS NOT NULL AND COLLATION_NAME NOT LIKE 'utf%');
在所有列上执行此操作后,再对所有表执行此操作:
ALTER TABLE [TABLE_SCHEMA].[TABLE_NAME] CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci;
要为你所有的表生成这个查询,使用下面的查询:
SELECT
CONCAT('ALTER TABLE ', TABLE_SCHEMA, '.', TABLE_NAME, ' CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4_general_ci;')
FROM INFORMATION_SCHEMA.TABLES
WHERE TABLE_COLLATION NOT LIKE 'utf8%'
and TABLE_SCHEMA in ('[TABLE_SCHEMA]');
现在你修改了所有的列和表,在数据库上做同样的事情:
ALTER DATABASE [DATA_BASE_NAME] CHARSET = utf8mb4 COLLATE = utf8mb4_general_ci;