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#--
# DBD::Pg
#
# Copyright (c) 2001, 2002, 2003 Jim Weirich, Michael Neumann <mneumann@ntecs.de>
# Copyright (c) 2008 Erik Hollensbe, Christopher Maujean
#
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
# 3. The name of the author may not be used to endorse or promote products
# derived from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
# INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
# AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
# THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
# EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
# PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
# OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
# WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
# OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
# ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#++
require 'dbi'
require 'pg'
module DBI
module DBD
#
# DBD::Pg - Database Driver for the PostgreSQL database system.
#
# Requires DBI and the 'pg' gem or package to work.
#
# Only things that extend DBI's results are documented.
#
module Pg
VERSION = "0.3.9"
DESCRIPTION = "PostgreSQL DBI DBD"
#
# returns 'Pg'
#
# See DBI::TypeUtil#convert for more information.
#
def self.driver_name
"Pg"
end
#
# This method takes a ruby Array and converts it to PostgreSQL array syntax.
#
def self.generate_array(obj)
# XXX yarr, there be recursion here, and it's probably not a good idea.
output = "{"
obj.each do |item|
case item
when ::Array
output += generate_array(item)
else
generated = DBI::TypeUtil.convert(driver_name, item)
generated = case item
when String
# in strings, escapes are doubled and the quotes are different.
# this gets *really* ugly and needs to be well-tested
"\"#{generated.gsub(/\\/) { "\\\\" }}\""
when Fixnum
generated.to_s
end
output += generated
end
output += "," # FIXME technically, delimiters are variable
end
output.sub(/,$/, '}')
end
#
# A quote helper, this uses the new syntax in PostgreSQL 8.2 and up.
#
def self.quote(value)
"E'#{ value.gsub(/\\/){ '\\\\' }.gsub(/'/){ '\\\'' } }'"
end
#
# Parse a postgresql type. Returns a hash with these fields (as Symbol)
#
# * ftype: the full type, as passed in to this method.
# * type: the type stripped of all attribute information.
# * size: the LHS of the attribute information, typically the precision.
# * decimal: the RHS of the attribute information, typically the scale.
# * array: true if this type is actually an array of that type.
#
def self.parse_type(ftype)
type = ftype
pos = ftype.index('(')
decimal = nil
size = nil
array_of_type = nil
if pos != nil
type = ftype[0..pos-1]
size = ftype[pos+1..-2]
pos = size.index(',')
if pos != nil
size, decimal = size.split(',', 2)
size = size.to_i
decimal = decimal.to_i
else
size = size.to_i
end
end
if type =~ /\[\]$/
type.sub!(/\[\]$/, '')
array_of_type = true
end
return {
:ftype => ftype.dup,
:type => type,
:size => size,
:decimal => decimal,
:array => array_of_type
}
end
#
# See DBI::BaseDriver.
#
class Driver < DBI::BaseDriver
def initialize
super("0.4.0")
end
## List of datasources for this database.
def data_sources
[]
end
## Connect to a database.
def connect(dbname, user, auth, attr)
Database.new(dbname, user, auth, attr)
end
end
end # module Pg
end # module DBD
end # module DBI
require 'dbd/pg/type'
require 'dbd/pg/database'
require 'dbd/pg/statement'
require 'dbd/pg/tuples'
require 'dbd/pg/exec'
pg = DBI::DBD::Pg
DBI::TypeUtil.register_conversion(pg.driver_name) do |obj|
newobj = case obj
when ::DateTime
obj.strftime("%Y-%m-%dT%H:%M:%S.%N")
when ::Time
::DateTime.parse(obj.to_s).strftime("%H:%M:%S.%N")
when ::Date
obj.strftime("%Y-%m-%d")
when ::Array
pg.generate_array(obj)
when DBI::DBD::Pg::Type::ByteA
obj.escaped
else
obj
end
[newobj, false]
end
|
