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alzabo::runtime::index

Alzabo::Runtime::Index(3pm)				User Contributed Perl Documentation			       Alzabo::Runtime::Index(3pm)

NAME

       Alzabo::Runtime::Index - Index objects

SYNOPSIS

	 use Alzabo::Runtime::Index;

DESCRIPTION

       This object represents an index on a table.  Indexes consist of columns and optional prefixes for each column.  The prefix specifies how
       many characters of the columns should be indexes (the first X chars).  Some RDBMS's do not have a concept of index prefixes.  Not all col-
       umn types are likely to allow prefixes though this depends on the RDBMS.  The order of the columns is significant.

INHERITS FROM

       "Alzabo::Index"

       Note: all relevant documentation from the superclass has been merged into this document.

METHODS

       columns

       Returns an ordered list of the "Alzabo::Runtime::Column" objects that are being indexed.

       prefix ("Alzabo::Runtime::Column" object)

       A column prefix is, to the best of my knowledge, a MySQL specific concept, and as such cannot be set when using an RDBMSRules module for a
       different RDBMS.  However, it is important enough for MySQL to have the functionality be present.  It allows you to specify that the index
       should only look at a certain portion of a field (the first N characters).  This prefix is required to index any sort of BLOB column in
       MySQL.

       This method returns the prefix for the column in the index.  If there is no prefix for this column in the index, then it returns undef.

       unique

       Returns a boolean value indicating whether the index is a unique index.

       fulltext

       Returns a boolean value indicating whether the index is a fulltext index.

       function

       For function indexes, this returns the function being indexed.

       id

       The id is generated from the table, column and prefix information for the index.  This is useful as a canonical name for a hash key, for
       example.

       Returns a string that is the id which uniquely identifies the index in this schema.

       table

       Returns the "Alzabo::Runtime::Table" object to which the index belongs.

AUTHOR

       Dave Rolsky, <autarch@urth.org>

perl v5.8.8							    2007-12-23					       Alzabo::Runtime::Index(3pm)

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