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eval command in Bash and its typical uses
... as a text file, reads each line of text, and uses eval to execute them in order. That's essentially the same behavior as the bash source statement, which is what one would use, unless it was necessary to perform some kind of transformation (e.g. filtering or substitution) on the content of the impo...
How does password salt help against a rainbow table attack?
...the salt.
You always have to store the salt with the password, because in order to validate what the user entered against your password database, you have to combine the input with the salt, hash it and compare it to the stored hash.
Security of the hash
Now somebody with a rainbow table could rev...
Determine which MySQL configuration file is being used
...lt options"
Default options are read from the following files in the given order:
/etc/mysql/my.cnf ~/.my.cnf /usr/etc/my.cnf
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Get records with max value for each group of grouped SQL results
...uper-simple way to do this in mysql:
select *
from (select * from mytable order by `Group`, age desc, Person) x
group by `Group`
This works because in mysql you're allowed to not aggregate non-group-by columns, in which case mysql just returns the first row. The solution is to first order the data...
Using Excel OleDb to get sheet names IN SHEET ORDER
...in the forums said
I am afraid that OLEDB does not preserve the sheet order as they were in Excel
Excel Sheet Names in Sheet Order
Seems like this would be a common enough requirement that there would be a decent workaround.
...
What is a “web service” in plain English?
...n about books at Amazon.com
You can use a similar web service to submit an order to Amazon.com
You could CREATE a web service to allow outside applications to find out about product information within your company
you could create a web service to allow outside applications to submit orders to your ...
Best design for a changelog / auditing database table? [closed]
...ed/updated/deleted a record
with ID=X in the table Foo and when?
So, in order to be able to answer such questions quickly (using SQL), we ended up having two additional columns in the audit table
object type (or table name)
object ID
That's when design of our audit log really stabilized (for a...
Why this line xmlns:android=“http://schemas.android.com/apk/res/android” must be the first in the la
...
This is just the XML Name Space declaration. We use this Name Space in order to specify that the attributes listed below, belongs to Android. Thus they starts with "android:"
You can actually create your own custom attributes. So to prevent the name conflicts where 2 attributes are named the sa...
Random row from Linq to Sql
...de...
throw new NotImplementedException();
}
}
Then just order by ctx.Random(); this will do a random ordering at the SQL-Server courtesy of NEWID(). i.e.
var cust = (from row in ctx.Customers
where row.IsActive // your filter
orderby ctx.Random()
...
SQL select join: is it possible to prefix all columns as 'prefix.*'?
...ns.post_parent`, `campaigns`.`guid` AS `campaigns.guid`, `campaigns`.`menu_order` AS `campaigns.menu_order`, `campaigns`.`post_type` AS `campaigns.post_type`, `campaigns`.`post_mime_type` AS `campaigns.post_mime_type`, `campaigns`.`comment_count` AS `campaigns.comment_count`,
`venues`.`ID` AS `v...