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
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