260 lines
8.9 KiB
Ruby
260 lines
8.9 KiB
Ruby
require 'parsedate'
|
|
|
|
module ActiveRecord
|
|
module ConnectionAdapters #:nodoc:
|
|
# An abstract definition of a column in a table.
|
|
class Column
|
|
attr_reader :name, :default, :type, :limit, :null, :sql_type
|
|
attr_accessor :primary
|
|
|
|
# Instantiates a new column in the table.
|
|
#
|
|
# +name+ is the column's name, as in <tt><b>supplier_id</b> int(11)</tt>.
|
|
# +default+ is the type-casted default value, such as <tt>sales_stage varchar(20) default <b>'new'</b></tt>.
|
|
# +sql_type+ is only used to extract the column's length, if necessary. For example, <tt>company_name varchar(<b>60</b>)</tt>.
|
|
# +null+ determines if this column allows +NULL+ values.
|
|
def initialize(name, default, sql_type = nil, null = true)
|
|
@name, @type, @null = name, simplified_type(sql_type), null
|
|
@sql_type = sql_type
|
|
# have to do this one separately because type_cast depends on #type
|
|
@default = type_cast(default)
|
|
@limit = extract_limit(sql_type) unless sql_type.nil?
|
|
@primary = nil
|
|
@text = [:string, :text].include? @type
|
|
@number = [:float, :integer].include? @type
|
|
end
|
|
|
|
def text?
|
|
@text
|
|
end
|
|
|
|
def number?
|
|
@number
|
|
end
|
|
|
|
# Returns the Ruby class that corresponds to the abstract data type.
|
|
def klass
|
|
case type
|
|
when :integer then Fixnum
|
|
when :float then Float
|
|
when :datetime then Time
|
|
when :date then Date
|
|
when :timestamp then Time
|
|
when :time then Time
|
|
when :text, :string then String
|
|
when :binary then String
|
|
when :boolean then Object
|
|
end
|
|
end
|
|
|
|
# Casts value (which is a String) to an appropriate instance.
|
|
def type_cast(value)
|
|
return nil if value.nil?
|
|
case type
|
|
when :string then value
|
|
when :text then value
|
|
when :integer then value.to_i rescue value ? 1 : 0
|
|
when :float then value.to_f
|
|
when :datetime then self.class.string_to_time(value)
|
|
when :timestamp then self.class.string_to_time(value)
|
|
when :time then self.class.string_to_dummy_time(value)
|
|
when :date then self.class.string_to_date(value)
|
|
when :binary then self.class.binary_to_string(value)
|
|
when :boolean then self.class.value_to_boolean(value)
|
|
else value
|
|
end
|
|
end
|
|
|
|
def type_cast_code(var_name)
|
|
case type
|
|
when :string then nil
|
|
when :text then nil
|
|
when :integer then "(#{var_name}.to_i rescue #{var_name} ? 1 : 0)"
|
|
when :float then "#{var_name}.to_f"
|
|
when :datetime then "#{self.class.name}.string_to_time(#{var_name})"
|
|
when :timestamp then "#{self.class.name}.string_to_time(#{var_name})"
|
|
when :time then "#{self.class.name}.string_to_dummy_time(#{var_name})"
|
|
when :date then "#{self.class.name}.string_to_date(#{var_name})"
|
|
when :binary then "#{self.class.name}.binary_to_string(#{var_name})"
|
|
when :boolean then "#{self.class.name}.value_to_boolean(#{var_name})"
|
|
else nil
|
|
end
|
|
end
|
|
|
|
# Returns the human name of the column name.
|
|
#
|
|
# ===== Examples
|
|
# Column.new('sales_stage', ...).human_name #=> 'Sales stage'
|
|
def human_name
|
|
Base.human_attribute_name(@name)
|
|
end
|
|
|
|
# Used to convert from Strings to BLOBs
|
|
def self.string_to_binary(value)
|
|
value
|
|
end
|
|
|
|
# Used to convert from BLOBs to Strings
|
|
def self.binary_to_string(value)
|
|
value
|
|
end
|
|
|
|
def self.string_to_date(string)
|
|
return string unless string.is_a?(String)
|
|
date_array = ParseDate.parsedate(string)
|
|
# treat 0000-00-00 as nil
|
|
Date.new(date_array[0], date_array[1], date_array[2]) rescue nil
|
|
end
|
|
|
|
def self.string_to_time(string)
|
|
return string unless string.is_a?(String)
|
|
time_array = ParseDate.parsedate(string)[0..5]
|
|
# treat 0000-00-00 00:00:00 as nil
|
|
Time.send(Base.default_timezone, *time_array) rescue nil
|
|
end
|
|
|
|
def self.string_to_dummy_time(string)
|
|
return string unless string.is_a?(String)
|
|
time_array = ParseDate.parsedate(string)
|
|
# pad the resulting array with dummy date information
|
|
time_array[0] = 2000; time_array[1] = 1; time_array[2] = 1;
|
|
Time.send(Base.default_timezone, *time_array) rescue nil
|
|
end
|
|
|
|
# convert something to a boolean
|
|
def self.value_to_boolean(value)
|
|
return value if value==true || value==false
|
|
case value.to_s.downcase
|
|
when "true", "t", "1" then true
|
|
else false
|
|
end
|
|
end
|
|
|
|
private
|
|
def extract_limit(sql_type)
|
|
$1.to_i if sql_type =~ /\((.*)\)/
|
|
end
|
|
|
|
def simplified_type(field_type)
|
|
case field_type
|
|
when /int/i
|
|
:integer
|
|
when /float|double|decimal|numeric/i
|
|
:float
|
|
when /datetime/i
|
|
:datetime
|
|
when /timestamp/i
|
|
:timestamp
|
|
when /time/i
|
|
:time
|
|
when /date/i
|
|
:date
|
|
when /clob/i, /text/i
|
|
:text
|
|
when /blob/i, /binary/i
|
|
:binary
|
|
when /char/i, /string/i
|
|
:string
|
|
when /boolean/i
|
|
:boolean
|
|
end
|
|
end
|
|
end
|
|
|
|
class IndexDefinition < Struct.new(:table, :name, :unique, :columns) #:nodoc:
|
|
end
|
|
|
|
class ColumnDefinition < Struct.new(:base, :name, :type, :limit, :default, :null) #:nodoc:
|
|
def to_sql
|
|
column_sql = "#{base.quote_column_name(name)} #{type_to_sql(type.to_sym, limit)}"
|
|
add_column_options!(column_sql, :null => null, :default => default)
|
|
column_sql
|
|
end
|
|
alias to_s :to_sql
|
|
|
|
private
|
|
def type_to_sql(name, limit)
|
|
base.type_to_sql(name, limit) rescue name
|
|
end
|
|
|
|
def add_column_options!(sql, options)
|
|
base.add_column_options!(sql, options.merge(:column => self))
|
|
end
|
|
end
|
|
|
|
# Represents a SQL table in an abstract way.
|
|
# Columns are stored as ColumnDefinition in the #columns attribute.
|
|
class TableDefinition
|
|
attr_accessor :columns
|
|
|
|
def initialize(base)
|
|
@columns = []
|
|
@base = base
|
|
end
|
|
|
|
# Appends a primary key definition to the table definition.
|
|
# Can be called multiple times, but this is probably not a good idea.
|
|
def primary_key(name)
|
|
column(name, native[:primary_key])
|
|
end
|
|
|
|
# Returns a ColumnDefinition for the column with name +name+.
|
|
def [](name)
|
|
@columns.find {|column| column.name.to_s == name.to_s}
|
|
end
|
|
|
|
# Instantiates a new column for the table.
|
|
# The +type+ parameter must be one of the following values:
|
|
# <tt>:primary_key</tt>, <tt>:string</tt>, <tt>:text</tt>,
|
|
# <tt>:integer</tt>, <tt>:float</tt>, <tt>:datetime</tt>,
|
|
# <tt>:timestamp</tt>, <tt>:time</tt>, <tt>:date</tt>,
|
|
# <tt>:binary</tt>, <tt>:boolean</tt>.
|
|
#
|
|
# Available options are (none of these exists by default):
|
|
# * <tt>:limit</tt>:
|
|
# Requests a maximum column length (<tt>:string</tt>, <tt>:text</tt>,
|
|
# <tt>:binary</tt> or <tt>:integer</tt> columns only)
|
|
# * <tt>:default</tt>:
|
|
# The column's default value. You cannot explicitely set the default
|
|
# value to +NULL+. Simply leave off this option if you want a +NULL+
|
|
# default value.
|
|
# * <tt>:null</tt>:
|
|
# Allows or disallows +NULL+ values in the column. This option could
|
|
# have been named <tt>:null_allowed</tt>.
|
|
#
|
|
# This method returns <tt>self</tt>.
|
|
#
|
|
# ===== Examples
|
|
# # Assuming def is an instance of TableDefinition
|
|
# def.column(:granted, :boolean)
|
|
# #=> granted BOOLEAN
|
|
#
|
|
# def.column(:picture, :binary, :limit => 2.megabytes)
|
|
# #=> picture BLOB(2097152)
|
|
#
|
|
# def.column(:sales_stage, :string, :limit => 20, :default => 'new', :null => false)
|
|
# #=> sales_stage VARCHAR(20) DEFAULT 'new' NOT NULL
|
|
def column(name, type, options = {})
|
|
column = self[name] || ColumnDefinition.new(@base, name, type)
|
|
column.limit = options[:limit] || native[type.to_sym][:limit] if options[:limit] or native[type.to_sym]
|
|
column.default = options[:default]
|
|
column.null = options[:null]
|
|
@columns << column unless @columns.include? column
|
|
self
|
|
end
|
|
|
|
# Returns a String whose contents are the column definitions
|
|
# concatenated together. This string can then be pre and appended to
|
|
# to generate the final SQL to create the table.
|
|
def to_sql
|
|
@columns * ', '
|
|
end
|
|
|
|
private
|
|
def native
|
|
@base.native_database_types
|
|
end
|
|
end
|
|
end
|
|
end
|