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Consider using an alternative string library String libraries are a great solution for preventing many buffer over ow vulnerabilities because they abstract away best practices for safe string operations, making it easy to do things the right way Anything that makes safe operations easier to perform than unsafe ones will make your program more secure and take more pressure off programmers

class LegacyProjectBase < ActiveRecord::Base establish_connection :legacy_database selfabstract_class = true end

Incidentally, to make this example work with subclasses, you must specify selfabstract_class = true in the class context Otherwise, Rails considers the subclasses of LegacyProject to be using single-table inheritance (STI), which we discuss at length in 9 Xavier says

Composite properties are optional by default that is, they do not need to be con gured when the composite is used as a component implementation If a property is not con gured and a default value is provided, the property will be set to that value If the Credit Component in Listing 519 had not speci ed min and max property values, the SCA runtime would have substituted the default values of 200 and 700

Strategy without tactics is the slowest route to victory Tactics without strategy is the noise before defeat Sun Tzu

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You can easily point your base class to different databases depending on the Rails environment like this:

class LegacyProjectBase < ActiveRecord::Base establish_connection "legacy_#{Railsenv}" selfabstract_class = true end

ot every buffer over ow is caused by errors in string manipulation, nor can every buffer over ow be prevented through judicious use of safer string-manipulation functions An integer over ow occurs when an integral value is increased or decreased beyond its capacity Integer over ow errors are frequently an attacker s springboard to a buffer over ow In many ways, buffer over ows are all about numbers Numbers determine how much memory to allocate, control the bounds for string operations, and are used to calculate offsets for indexing memory Likewise, not every countermeasure against buffer over ow vulnerabilities comes in the form of judicious string manipulation In this chapter, we introduce integer overflow errors and how they often lead to buffer overflow vulnerabilities We then discuss the benefits and shortcomings of runtime approaches to mitigating buffer overflow vulnerabilities The chapter is divided into two sections: Integers Operations that might carry a variable beyond its maximum or minimum value can be a prelude to a buffer over ow Runtime protections The best protection against buffer overflow is to implement the program in a type-safe and memory-safe language such as Java or C#, or in a safer C dialect, such as CCured or Cyclone Another alternative is to insert runtime buffer overflow protections after the program is written, but this approach doesn t solve the whole of the problem

Then just add multiple entries to databaseyml to match the resulting connection names In the case of our example, legacy_development, legacy_test, etc

The establish_connection method takes a string (or symbol) key pointing to a configuration already defined in databaseyml Alternatively, you can pass it a literal hash of options, although it s messy to put this sort of configuration data right into your model file instead of databaseyml

A property con guration can be made mandatory by setting the mustSupply attribute on the property declaration in the composite to true

class TempProject < ActiveRecord::Base establish_connection :adapter => 'sqlite3', :database => ':memory:' end

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Rails keeps database connections in a connection pool inside the ActiveRecord::

retrieve_connection method walks up the class-hierarchy until a matching con-

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