How to dump a file stored in a sqlite database as a blob?

Question

I have a sqlite3 database. One column has the TEXT type, and contains blobs which I would like to save as file. Those are gzipped files.

The output of the command

Answer 1

I had to make some minor changes on CL's answer, in order to make it work for me:

• The structure for the command that he is using does not have the database name in it, the syntax that I am using is something like:

  sqlite3 mydatabase.sqlite3 "Select quote(BlobField) From TableWithBlod Where StringKey = '1';" | ...
  

• The way he is using the cut command does not work in my machine. The correct way for me is:

  cut -d "'" -f2
  

So the final command would be something like:

sqlite3 mydatabase.sqlite3 "Select quote(BlobField) From TableWithBlod Where StringKey = '1';" | cut -d "'" -f2 | xxd -r -p > myfile.extension

And in my case:

sqlite3 osm-carto_z14_m8_m.mbtiles "select quote(images.tile_data) from images where images.tile_id = '1';" | cut -d "'" -f2 | xxd -r -p > image.png