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A little known fact is that you can remove old migration files (while still keeping newer ones) to keep the db/migrate folder to a manageable size You can move the older migrations to a db/archived_migrations folder or something like that Once you do trim the size of your migrations folder, use the rake db:reset task to (re)create your database from db/schemarb and load the seeds into your current environment

614 change table(table name, & block)

The following table details the methods that are available in the context of create_table and change_table methods within a migration class

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Enable runtime integer error checks using /RTCc, which reports when a value is assigned to a smaller data type and results in a data loss The /RTC option should be used only for debugging purposes and cannot be used in production builds or with /O compiler optimization ags GCC These best practices for GCC come from GNU: Compile with integer-relevant options enabled, and be vigilant for compiler warnings they generate -Wconversion Warn on a variety of potentially problematic type conversions, including conversions between xed and oating-point numbers and implicit conversions of a signed constant to an unsigned type -Wsign-compare Warn when a signed value can be converted to an unsigned value and cause a comparison to produce incorrect results Investigate all uses of #pragma GCC diagnostic ignored option that disable integer-relevant compiler warnings 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 Enable runtime integer error checks using -ftrapv, which generates traps for signed over ow on addition, subtraction, and multiplication operations Like /RTC on Microsoft compilers, -ftrapv usually cannot be used in production builds because of the performance penalty it incurs Understand Integer Conversion Rules It s difficult to avoid being burned by an unexpected type conversion, but education is the best defense The C99 standard mandates a complex set of rules governing the way type conversion should be handled [ISO C99, 2005] The rules are of sufficient length and complexity that most people don t commit them all to memory, but two basic points are worth remembering First, in an operation involving more than one data type, the data type that offers less precision is typically upcast, which can cause unexpected changes in the way the value is represented Second, an unsigned value can be implicitly cast to a larger signed type if the signed type can represent all the possible values of the unsigned type This could cause an integer overflow to occur in operations that appear safe because the range.

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change(column name, type, options = {})

Having walked through the con guration of complex property types, is the complexity and time required to de ne an XML Schema worth it Most applications can likely make do with simple types However, considering that an XML Schema only needs to be written once, the bene ts it affords (most notably validation of property values) are well worth it

Changes the column s definition according to the new options The options hash optionally contains a hash with arguments that correspond to the options used when adding columns

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of the unsigned type might be insufficient to handle the result of the operation Verify Pre- and Post-Conditions for Operators That Can Over ow Of the large number of integer operators provided in C and C++, many can contribute to integer over ow vulnerabilities Consider Table 71, which provides a listing of the standard C and C++ operators that can result in over ow or under ow For any operator in the two left columns, some form of check must occur either before or after the operation is performed to ensure that it does not lead to an unexpected result The operators in the two right columns can be safely excluded from integer over ow checks

tchange(:name, :string, :limit => 80) tchange(:description, :text)

change default(column name, default)

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java ean 13 generator