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When I export a blob object to an SQL file, I get some thing like this for a blob field:

0x4f3a383a227374644.....,

Questions

  • I would like to know how the BLOB is actually converted to the above format?
  • What is its underlying representation?
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It's the raw data in hexidecimal format. –  FreshPhilOfSO Sep 20 '12 at 12:01
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1 Answer

up vote 1 down vote accepted

If you use mysqldump, you can specify the hexadecimal format for BLOB data

mysqldump -u... -p... --hex-blob --all-databases ...

Here is the help on hex-blob in mysqldump

$ mysqldump --help | grep -A 1 "blob" | head -2
  --hex-blob          Dump binary strings (BINARY, VARBINARY, BLOB) in
                      hexadecimal format.
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