There’s a lot I like about PostgreSQL, and I’ll probably switch eventually, but for now, I’m still more comfortable with MySQL, especially its ability to update huge amounts of existing data in-place very quickly.
I do have some technical gripes with MySQL, though:
- InnoDB doesn’t support fulltext indexes, so I’ve forced to give up referential integrity for any table that needs fulltext searching.
mysql(1)command-line tool doesn’t allow setting user variables on the command line when invoking a script.
The first is too big a problem for me to take on right now, but the second looked like it just needed a bit of perl magic, so I wrote a wrapper script:
This script scans each command-line option for a string beginning with “@”, and pulls it out of the arguments before passing the rest on to mysql. Any option in the format @name=value will be converted to a SQL variable declaration and passed to mysql; any other option gets passed through unmodified.
Let’s say that you have a SQL script named
use mydatabase; select * from Stuff where type=@type;
You can invoke this script like this:
runmysql @type=foo -X < getstuff.sql
The script will run the command “mysql -X” (the “-X” means XML output — it’s just there to demonstrate how other options get passed through), and prepend a declaration to the SQL script, so that MySQL actually sees this:
set @type = 'foo'; use mydatabase; select * from Stuff where type=@type;
That’s it, really. Of course, it’s not that useful in a trivial script like this, but for scripts that load data from many different files (for example), it makes life much simpler.
Useful script. Do you have it on github ??
If mysql prompts for a password, the input does not get fed to mysql correctly apparently.
Sadly this doesn’t seem to work if you want to specify the database name as a variable. e.g. CREATE DATABASE @DBNAME. Having to resort to using sed. 😦
You CAN pass variables from the command-line , but you have to source your .sql script instead of feeding it via STDIN. Run the mysql command like this:
mysql -h HOST -u USER -pPASS -e “set @type = ‘foo’; source getstuff.sql;”
Don’t forget the semicolons.
The sad part of this story is that you CANNOT use variables for a table, column, or database name or part of such a name. Rats! That would be quite useful, wouldn’t it?
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