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The create_table method needs at minimum a name for the table and a block containing column definitions Why do we specify identifiers with symbols instead of strings Both will work, but symbols require one less keystroke1 The create_table method makes a huge, but usually true assumption that we want an autoincrementing, integer-typed, primary key That is why you don t see it declared in the list of columns If that assumption happens to be wrong, it s time to pass create_table some options in a hash For example, how would you define a simple join table consisting of two foreign key columns and not needing its own primary key Just pass the create_table method an :id option set to false, as a boolean, not a symbol! It will stop the migration from autogenerating a primary key altogether:

create_table :ingredients_recipes, :id => false do |t| tcolumn :ingredient_id, :integer tcolumn :recipe_id, :integer end

The validationRulesxml document contents can then be a little simpler, because it can use the bigbankcom namespace as the default namespace (see Listing 528) It also is easier for tools to validate it against its schema

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If all you want to do is change the name of the primary key column from its default of id , pass the :id option a symbol instead For example, let s say your corporation mandates that primary keys follow the pattern tablename id Then the earlier example would look as follows:

create_table :clients, :id => :clients_id do |t| tcolumn :name, :string tcolumn :code, :string tcolumn :created_at, :datetime tcolumn :updated_at, :datetime end

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Sanity-Check Values Used to Allocate and Access Memory Ensure that values used in sensitive operations, such as memory allocation, pass basic sanity checks Don t do any math after the nal sanity check Be particularly wary about signed arguments to memory-allocation methods and other places where a signed value will be implicitly converted to unsigned Unexpected sign conversion can allow attackers to bypass basic tests, such as comparison with a maximum size Always bound string manipulation and other memory access with known-safe values based on the amount of memory allocated rather than some property of the data being operated upon Respect Compiler Warnings With the appropriate warning level set and runtime checks enabled, modern compilers can provide a great deal of assistance in tracking down potential integer over ow errors Although warnings are not guaranteed to represent smoking-gun exploitable vulnerabilities, they will almost invariably call attention to code that is likely to cause trouble If your program requires a lot of type casts to compile without warnings, you ve got trouble The following subsections summarize best practices for using GCC and the Microsoft Visual Studio 2005 compiler, CL, to help track down integer over ow errors CL These best practices for CL come from MSDN: Compile with the highest possible warning level using /W4 Be vigilant for integer-related compiler warnings generated by CL, particularly these: C4018 Comparing a signed and an unsigned number requires the compiler to convert the signed value to unsigned C4244 An integer type is converted to a smaller integer type Loss of data might have occurred C4389 An operation involved signed and unsigned variables This could result in a loss of data Investigate all uses of #pragma warning(disable, C####) that disable integer over ow relevant compiler warnings (C4018, C4389, and C4244) Be equally cautious of explicit casts that can suppress instances of the same set of warnings If any are found, comment them out and recompile to check for instances of the aforementioned warnings.

The :force => true option tells the migration to go ahead and drop the table being defined if it exists Be careful with this one, since it will produce (possibly unwanted) data loss when run in production As far as I know, the :force option is mostly useful for making sure that the migration puts the database in a known state, but isn t all that useful on a daily basis The :options option allows you to append custom instructions to the SQL CREATE statement and is useful for adding database-specific commands to your migration Depending on the database you re using, you might be able to specify things such as character set, collation, comments, min/max sizes, and many other properties using this option The :temporary => true option specifies creation of a temporary table that will only exist during the current connection to the database In other words, it only exists

during the migration In advanced scenarios, this option might be useful for migrating big sets of data from one table to another, but is not commonly used Sebastian says

<validationRules xmlns="http://bigbankcom"> <rule name="ssn"> < eld>ssn</b: eld> <format>^\d{3}-\d{2}-\d{4}$</format> </rule> <rule name="zip"> < eld>zipCode</ eld> <format>^\d{5}$|^\d{5}-\d{4}$</format> </rule> </validationRules>

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