set - MySQL blob dump to tab delimited files -

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i migrating mysql 5.1 database in amazon's ec2, , having issues tables longblob datatype use image storage. basically, after migration, data in longblob column different size, due fact character encoding seems different.

first of all, here example of before , after migration:

old:

x??]]??}?_ѕ??d??i|w?%?????q$??+?

new:

x��]]����_ѕ��d��i|w�%�����q$��+�

i checked character set variables on both machines , identical. checked 'show create table' , identical well. client's both connecting same way (no set names, or specifying character sets).

here mysqldump command used (i tried without --hex-blob well):

mysqldump --hex-blob --default-character-set=utf8 --tab=. db_name

here how loaded data:

mysql db_name --default-character-set=utf8 -e "load data infile 'example.txt' table example;"

here mysql character set variables (identical):

old:

+--------------------------+----------------------------+ | variable_name            | value                      | +--------------------------+----------------------------+ | character_set_client     | latin1                     |  | character_set_connection | latin1                     |  | character_set_database   | utf8                       |  | character_set_filesystem | binary                     |  | character_set_results    | latin1                     |  | character_set_server     | latin1                     |  | character_set_system     | utf8                       |  | character_sets_dir       | /usr/share/mysql/charsets/ |  +--------------------------+----------------------------+

new:

+--------------------------+----------------------------+     | variable_name            | value                      | +--------------------------+----------------------------+ | character_set_client     | latin1                     |  | character_set_connection | latin1                     |  | character_set_database   | utf8                       |  | character_set_filesystem | binary                     |  | character_set_results    | latin1                     |  | character_set_server     | latin1                     |  | character_set_system     | utf8                       |  | character_sets_dir       | /usr/share/mysql/charsets/ |  +--------------------------+----------------------------+

i'm not sure else try able run mysqldump , have blob data identical on both machines. tips appreciated.

the issue seems bug in mysql (http://bugs.mysql.com/bug.php?id=27724). solution not use mysqldump, write own select outfile script tables have blob data. here example:

select coalesce(column1, @nullval),  coalesce(column2, @nullval),  coalesce(hex(column3), @nullval),  coalesce(column4, @nullval),  coalesce(column5, @nullval) table outfile '/mnt/dump/table.txt'  fields terminated '\t' lines terminated '\n';

to load data:

set names utf8; load data infile '/mnt/dump/table.txt' table table fields terminated '\t' lines terminated '\n' (column1, column1, @column1, column1, column1) set data = unhex(@column1)

this loads blob data correctly.


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