Another use of BLOB fields would be to store things like fingerprints or retina scans, which could be very useful if you have a security-oriented table that needs to store biometric data.
I should note that I have never actually stored biometric data or worked with it but I saw an overhead once that said it could be done. I have no idea what file format biometrics would use or how you would get them from the fingerprint/retina scanner into the database though. Rhino ----- Original Message ----- From: "Daniel Lahey" <[EMAIL PROTECTED]> To: "mysql" <[EMAIL PROTECTED]> Sent: Friday, August 06, 2004 11:03 PM Subject: Re: What would you store in a BLOB field? > Another use for binary columns is for case-sensitive text such as > passwords. If you store text in a CHAR, VARCHAR, or TEXT column, > comparisons will not be case-sensitive unless you use the BINARY > keyword. An example (from section 6.3.22 of the Language Reference: > > mysql> SELECT "a" = "A"; > -> 1 > mysql> SELECT BINARY "a" = "A"; > -> 0 > > On Aug 6, 2004, at 7:10 PM, Dan Nelson wrote: > > > In the last episode (Aug 06), Levi Campbell said: > >> I know the blob field is binary but what would you store there? and > >> if you could give me an example of real-life uses please. > > > > Say you want to have multiple remote webservers all serving the same > > data. Create a table with "filename", "mtime", and "content" fields > > and replicate it to a mysql database on each server. The "content" > > field would be a blob. You could also add custom HTML fields, like > > Content-Type: and Expires:. > > > > You could have an employee table, with their photo in a blob field. > > > > You could implement your own full-text index by creating a table next > > to a table of documents, with a "word" field, and a blob field > > containing a compressed bitmap of documents containing that word. > > Searches would be done by pulling the bitmaps for each search word and > > AND/OR'ing them (I have done this; it works well). > > > > -- > > Dan Nelson > > [EMAIL PROTECTED] > > > > -- > > MySQL General Mailing List > > For list archives: http://lists.mysql.com/mysql > > To unsubscribe: > > http://lists.mysql.com/[EMAIL PROTECTED] > > > > > -- > MySQL General Mailing List > For list archives: http://lists.mysql.com/mysql > To unsubscribe: http://lists.mysql.com/[EMAIL PROTECTED] > > -- MySQL General Mailing List For list archives: http://lists.mysql.com/mysql To unsubscribe: http://lists.mysql.com/[EMAIL PROTECTED]
