如何改变数据库，表，列的排序规则?

数据库现在是latin1_general_ci，我想将排序规则更改为utf8mb4_general_ci。

在PhpMyAdmin中是否有任何设置来更改数据库，表，列的排序规则?而不是一个一个地改变?

当前回答

我很惊讶地发现，所以我不得不回到这里报告，优秀和维护良好的Interconnect/it SAFE SEARCH and REPLACE ON DATABASE脚本有一些选项可以将表转换为utf8 / unicode，甚至转换为innodb。它是一个脚本，通常用于将数据库驱动的网站(Wordpress, Drupal, Joomla等)从一个域迁移到另一个域。

https://github.com/interconnectit/Search-Replace-DB https://interconnectit.com/products/search-and-replace-for-wordpress-databases/

2016-10-19 20:10:52

其他回答

你可以运行一个php脚本。

               <?php
                   $con = mysql_connect('localhost','user','password');
                   if(!$con) { echo "Cannot connect to the database ";die();}
                   mysql_select_db('dbname');
                   $result=mysql_query('show tables');
                   while($tables = mysql_fetch_array($result)) {
                            foreach ($tables as $key => $value) {
                             mysql_query("ALTER TABLE $value CONVERT TO CHARACTER SET utf8 COLLATE utf8_general_ci");
                       }}
                   echo "The collation of your database has been successfully changed!";
                ?>

2012-10-04 06:23:05

我在这里读到，你需要手动转换每个表，这是不正确的。下面是一个如何使用存储过程的解决方案:

DELIMITER $$

DROP PROCEDURE IF EXISTS changeCollation$$

-- character_set parameter could be 'utf8'
-- or 'latin1' or any other valid character set
CREATE PROCEDURE changeCollation(IN character_set VARCHAR(255))
BEGIN
DECLARE v_finished INTEGER DEFAULT 0;
DECLARE v_table_name varchar(255) DEFAULT "";
DECLARE v_message varchar(4000) DEFAULT "No records";

-- This will create a cursor that selects each table,
-- where the character set is not the one
-- that is defined in the parameter

DECLARE alter_cursor CURSOR FOR SELECT DISTINCT TABLE_NAME
FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_SCHEMA = DATABASE()
AND COLLATION_NAME NOT LIKE CONCAT(character_set, '_%');

-- This handler will set the value v_finished to 1
-- if there are no more rows

DECLARE CONTINUE HANDLER
FOR NOT FOUND SET v_finished = 1;

OPEN alter_cursor;

-- Start a loop to fetch each rows from the cursor
get_table: LOOP

-- Fetch the table names one by one
FETCH alter_cursor INTO v_table_name;

-- If there is no more record, then we have to skip
-- the commands inside the loop
IF v_finished = 1 THEN
LEAVE get_table;
END IF;

IF v_table_name != '' THEN

IF v_message = 'No records' THEN
SET v_message = '';
END IF;

-- This technic makes the trick, it prepares a statement
-- that is based on the v_table_name parameter and it means
-- that this one is different by each iteration inside the loop

SET @s = CONCAT('ALTER TABLE ',v_table_name,
' CONVERT TO CHARACTER SET ', character_set);
PREPARE stmt FROM @s;
EXECUTE stmt;
DEALLOCATE PREPARE stmt;

SET v_message = CONCAT('The table ', v_table_name ,
' was changed to the default collation of ', character_set,
'.\n', v_message);

SET v_table_name = '';

END IF;
-- Close the loop and the cursor
END LOOP get_table;
CLOSE alter_cursor;

-- Returns information about the altered tables or 'No records'
SELECT v_message;

END $$

DELIMITER ;

创建过程后，可以简单地调用它:

CALL changeCollation('utf8');

更多细节请阅读这篇博客。

2015-06-09 13:07:05