A script to change all tables and fields to the utf-8-bin collation in MYSQL

Question

Is there a SQL or PHP script that I can run that will change the default collation in all tables and fields in a database?

I can write one myself, but I think that this should be something that readily available at a site like this. If I can come up with one myself before somebody posts one, I will post it myself.

Solution 1

Be careful! If you actually have utf stored as another encoding, you could have a real mess on your hands. Back up first. Then try some of the standard methods:

for instance http://www.cesspit.net/drupal/node/898 http://www.hackszine.com/blog/archive/2007/05/mysql_database_migration_latin.html

I've had to resort to converting all text fields to binary, then back to varchar/text. This has saved my ass.

I had data is UTF8, stored as latin1. What I did:

Drop indexes. Convert fields to binary. Convert to utf8-general ci

If your on LAMP, don’t forget to add set NAMES command before interacting with the db, and make sure you set character encoding headers.

Solution 2

Can be done in a single command (rather than 148 of PHP):

mysql --database=dbname -B -N -e "SHOW TABLES" \
| awk '{print "SET foreign_key_checks = 0; ALTER TABLE", $1, "CONVERT TO CHARACTER SET utf8 COLLATE utf8_general_ci; SET foreign_key_checks = 1; "}' \
| mysql --database=dbname &

You've got to love the commandline... (You might need to employ the --user and --password options for mysql).

EDIT: to avoid foreign key problems, added SET foreign_key_checks = 0; and SET foreign_key_checks = 1;

Solution 3

I think it's easy to do this in two steps runin PhpMyAdmin.
Step 1:

SELECT CONCAT('ALTER TABLE `', t.`TABLE_SCHEMA`, '`.`', t.`TABLE_NAME`,
 '` CONVERT TO CHARACTER SET utf8 COLLATE utf8_general_ci;') as stmt 
FROM `information_schema`.`TABLES` t
WHERE 1
AND t.`TABLE_SCHEMA` = 'database_name'
ORDER BY 1

Step 2:
This query will output a list of queries, one for each table. You have to copy the list of queries, and paste them to the command line or to PhpMyAdmin's SQL tab for the changes to be made.

Solution 4

This PHP snippet will change the collation on all tables in a db. (It's taken from this site.)

<?php
// your connection
mysql_connect("localhost","root","***");
mysql_select_db("db1");

// convert code
$res = mysql_query("SHOW TABLES");
while ($row = mysql_fetch_array($res))
{
    foreach ($row as $key => $table)
    {
        mysql_query("ALTER TABLE " . $table . " CONVERT TO CHARACTER SET utf8 COLLATE utf8_unicode_ci");
        echo $key . " =&gt; " . $table . " CONVERTED<br />";
    }
}
?> 

Solution 5

Another approach using command line, based on @david's without the awk

for t in $(mysql --user=root --password=admin  --database=DBNAME -e "show tables";);do echo "Altering" $t;mysql --user=root --password=admin --database=DBNAME -e "ALTER TABLE $t CONVERT TO CHARACTER SET utf8 COLLATE utf8_unicode_ci;";done

prettified

  for t in $(mysql --user=root --password=admin  --database=DBNAME -e "show tables";);
    do 
       echo "Altering" $t;
       mysql --user=root --password=admin --database=DBNAME -e "ALTER TABLE $t CONVERT TO CHARACTER SET utf8 COLLATE utf8_unicode_ci;";
    done

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