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part of the SQL statement and the conditions, expressed as part of a where clause The method returns the number of records updated4 I think this is one of those methods that is generally more useful in a scripting context than in a controller method, but you might feel differently Here is a quick example of how I might go about reassigning all the Rails projects in the system to a new project manager

Projectupdate_all({:manager => 'Ron Campbell'}, :technology => 'Rails')

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The update_all method also accepts string parameters, which allows you to leverage the power of SQL!

The <reference> entry creates a composite reference that promotes the auditService reference on the CreditComponent When the CreditComposite is used as a component implementation, this reference must be wired to a service as done in the SCDL in Listing 511

Projectupdate_all("cost = cost * 3", "lower(technology) LIKE '%microsoft%'")

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At the heart of many format string exploits is the %n formatting directive, which causes the number of characters already processed to be written to memory as an integer value This directive is a black sheep most formatting directives pertain to the way input parameters are interpreted The %n directive alone calls for the processing function to write data out to one of the function arguments The capability to write data is a valuable attack vector Another important property of the %n directive is that it writes the number of bytes that should have been written instead of the actual number that were written This is important when output is written to a xed-size string and is truncated due to a lack of available space Even with the capability to write values to memory, an attacker must have two things in order to mount a highly effective exploit: Control over the location in memory to which the %n directive writes Control over the value the %n directive writes Because of the way stack frames are constructed, the rst challenge can often be easily overcome simply by placing the target address for the %n directive in the format string being processed Because the characters will likely be copied unchanged onto the stack, careful tinkering with the number conversion speci cations will cause the formatted string function to interpret the attacker supplied value as the address of an integer in memory and write the number of bytes process to the speci ed location Either analysis of the executing binary or trial-and-error attempts will be necessary to determine the location of the target address Now that the attacker can control the location in memory to which the %n directive will write, all that remains is to stuff an interesting value there This challenge is easier to overcome because the attacker can specify an arbitrary eld width as part of many conversation speci cations The combination of eld-width speci ers and the property that the %n directive will write out the number of characters that would have been processed, regardless of any truncation that might have occurred, gives the attacker the capability to construct arbitrarily large values An even more sophisticated version of this attack uses four staggered %n writes to completely control the value of a pointer To see an attack in action, Tim Newsham s original explication on format string vulnerabilities, Format String Attacks, illustrates the steps involved in a canonical format string attack [Newsham, 2000].

The most basic way to update an Active Record object is to manipulate its attributes directly and then call save It s worth noting that save will insert a record in the database if necessary or update an existing record with the same primary key

The save method will return true if it was successful or false if it failed for any reason There is another method, save!, that will use exceptions instead Which one to use depends on whether you plan to deal with errors right away or delegate the problem to another method further up the chain It s mostly a matter of style, although the non-bang save and update methods that return a boolean value are often used in controller actions, as the clause for an if condition:

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