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require 'active_record/connection_adapters/abstract_adapter'
# sqlserver_adapter.rb -- ActiveRecord adapter for Microsoft SQL Server
#
# Author: Joey Gibson <joey@joeygibson.com>
# Date: 10/14/2004
#
# Modifications: DeLynn Berry <delynnb@megastarfinancial.com>
# Date: 3/22/2005
#
# Modifications (ODBC): Mark Imbriaco <mark.imbriaco@pobox.com>
# Date: 6/26/2005
#
module ActiveRecord
class Base
def self.sqlserver_connection(config) #:nodoc:
require_library_or_gem 'dbi' unless self.class.const_defined?(:DBI)
symbolize_strings_in_hash(config)
mode = config[:mode] ? config[:mode].to_s.upcase : 'ADO'
username = config[:username] ? config[:username].to_s : 'sa'
password = config[:password] ? config[:password].to_s : ''
if mode == "ODBC"
raise ArgumentError, "Missing DSN. Argument ':dsn' must be set in order for this adapter to work." unless config.has_key?(:dsn)
dsn = config[:dsn]
conn = DBI.connect("DBI:ODBC:#{dsn}", username, password)
else
raise ArgumentError, "Missing Database. Argument ':database' must be set in order for this adapter to work." unless config.has_key?(:database)
database = config[:database]
host = config[:host] ? config[:host].to_s : 'localhost'
conn = DBI.connect("DBI:ADO:Provider=SQLOLEDB;Data Source=#{host};Initial Catalog=#{database};User Id=#{username};Password=#{password};")
end
conn["AutoCommit"] = true
ConnectionAdapters::SQLServerAdapter.new(conn, logger)
end
end # class Base
module ConnectionAdapters
class ColumnWithIdentity < Column# :nodoc:
attr_reader :identity, :is_special, :scale
def initialize(name, default, sql_type = nil, is_identity = false, scale_value = 0)
super(name, default, sql_type)
@identity = is_identity
@is_special = sql_type =~ /text|ntext|image/i ? true : false
@scale = scale_value
end
def simplified_type(field_type)
case field_type
when /int|bigint|smallint|tinyint/i then :integer
when /float|double|decimal|money|numeric|real|smallmoney/i then @scale == 0 ? :integer : :float
when /datetime|smalldatetime/i then :datetime
when /timestamp/i then :timestamp
when /time/i then :time
when /text|ntext/i then :text
when /binary|image|varbinary/i then :binary
when /char|nchar|nvarchar|string|varchar/i then :string
when /bit/i then :boolean
end
end
def type_cast(value)
return nil if value.nil? || value =~ /^\s*null\s*$/i
case type
when :string then value
when :integer then value == true || value == false ? value == true ? 1 : 0 : value.to_i
when :float then value.to_f
when :datetime then cast_to_datetime(value)
when :timestamp then cast_to_time(value)
when :time then cast_to_time(value)
else value
end
end
def cast_to_time(value)
return value if value.is_a?(Time)
time_array = ParseDate.parsedate(value)
time_array[0] ||= 2000
time_array[1] ||= 1
time_array[2] ||= 1
Time.send(Base.default_timezone, *time_array) rescue nil
end
def cast_to_datetime(value)
if value.is_a?(Time)
if value.year != 0 and value.month != 0 and value.day != 0
return value
else
return Time.mktime(2000, 1, 1, value.hour, value.min, value.sec) rescue nil
end
end
return cast_to_time(value) if value.is_a?(Date) or value.is_a?(String) rescue nil
value
end
# These methods will only allow the adapter to insert binary data with a length of 7K or less
# because of a SQL Server statement length policy.
def string_to_binary(value)
value.gsub(/(\r|\n|\0|\x1a)/) do
case $1
when "\r" then "%00"
when "\n" then "%01"
when "\0" then "%02"
when "\x1a" then "%03"
end
end
end
def binary_to_string(value)
value.gsub(/(%00|%01|%02|%03)/) do
case $1
when "%00" then "\r"
when "%01" then "\n"
when "%02\0" then "\0"
when "%03" then "\x1a"
end
end
end
end
# In ADO mode, this adapter will ONLY work on Windows systems,
# since it relies on Win32OLE, which, to my knowledge, is only
# available on Windows.
#
# This mode also relies on the ADO support in the DBI module. If you are using the
# one-click installer of Ruby, then you already have DBI installed, but
# the ADO module is *NOT* installed. You will need to get the latest
# source distribution of Ruby-DBI from http://ruby-dbi.sourceforge.net/
# unzip it, and copy the file
# <tt>src/lib/dbd_ado/ADO.rb</tt>
# to
# <tt>X:/Ruby/lib/ruby/site_ruby/1.8/DBD/ADO/ADO.rb</tt>
# (you will more than likely need to create the ADO directory).
# Once you've installed that file, you are ready to go.
#
# In ODBC mode, the adapter requires the ODBC support in the DBI module which requires
# the Ruby ODBC module. Ruby ODBC 0.996 was used in development and testing,
# and it is available at http://www.ch-werner.de/rubyodbc/
#
# Options:
#
# * <tt>:mode</tt> -- ADO or ODBC. Defaults to ADO.
# * <tt>:username</tt> -- Defaults to sa.
# * <tt>:password</tt> -- Defaults to empty string.
#
# ADO specific options:
#
# * <tt>:host</tt> -- Defaults to localhost.
# * <tt>:database</tt> -- The name of the database. No default, must be provided.
#
# ODBC specific options:
#
# * <tt>:dsn</tt> -- Defaults to nothing.
#
# ADO code tested on Windows 2000 and higher systems,
# running ruby 1.8.2 (2004-07-29) [i386-mswin32], and SQL Server 2000 SP3.
#
# ODBC code tested on a Fedora Core 4 system, running FreeTDS 0.63,
# unixODBC 2.2.11, Ruby ODBC 0.996, Ruby DBI 0.0.23 and Ruby 1.8.2.
# [Linux strongmad 2.6.11-1.1369_FC4 #1 Thu Jun 2 22:55:56 EDT 2005 i686 i686 i386 GNU/Linux]
class SQLServerAdapter < AbstractAdapter
def native_database_types
{
:primary_key => "int NOT NULL IDENTITY(1, 1) PRIMARY KEY",
:string => { :name => "varchar(255)" },
:text => { :name => "text(16)" },
:integer => { :name => "int(4)", :limit => 11 },
:float => { :name => "float(8)" },
:datetime => { :name => "datetime(8)" },
:timestamp => { :name => "datetime(8)" },
:time => { :name => "datetime(8)" },
:date => { :name => "datetime(8)" },
:binary => { :name => "image(16)" },
:boolean => { :name => "bit(1)" }
}
end
def adapter_name
'SQLServer'
end
def select_all(sql, name = nil)
select(sql, name)
end
def select_one(sql, name = nil)
add_limit!(sql, nil)
result = select(sql, name)
result.nil? ? nil : result.first
end
def columns(table_name, name = nil)
sql = "SELECT COLUMN_NAME as ColName, COLUMN_DEFAULT as DefaultValue, DATA_TYPE as ColType, COL_LENGTH('#{table_name}', COLUMN_NAME) as Length, COLUMNPROPERTY(OBJECT_ID('#{table_name}'), COLUMN_NAME, 'IsIdentity') as IsIdentity, NUMERIC_SCALE as Scale FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_NAME = '#{table_name}'"
# Comment out if you want to have the Columns select statment logged.
# Personnally, I think it adds unneccessary bloat to the log.
# If you do comment it out, make sure to un-comment the "result" line that follows
result = log(sql, name) { @connection.select_all(sql) }
#result = @connection.select_all(sql)
columns = []
result.each { |field| columns << ColumnWithIdentity.new(field[:ColName], field[:DefaultValue].to_s.gsub!(/[()\']/,"") =~ /null/ ? nil : field[:DefaultValue], "#{field[:ColType]}(#{field[:Length]})", field[:IsIdentity] == 1 ? true : false, field[:Scale]) }
columns
end
def insert(sql, name = nil, pk = nil, id_value = nil, sequence_name = nil)
begin
table_name = get_table_name(sql)
col = get_identity_column(table_name)
ii_enabled = false
if col != nil
if query_contains_identity_column(sql, col)
begin
execute enable_identity_insert(table_name, true)
ii_enabled = true
rescue Exception => e
raise ActiveRecordError, "IDENTITY_INSERT could not be turned ON"
end
end
end
log(sql, name) do
@connection.execute(sql)
select_one("SELECT @@IDENTITY AS Ident")["Ident"]
end
ensure
if ii_enabled
begin
execute enable_identity_insert(table_name, false)
rescue Exception => e
raise ActiveRecordError, "IDENTITY_INSERT could not be turned OFF"
end
end
end
end
def execute(sql, name = nil)
if sql =~ /^\s*INSERT/i
insert(sql, name)
elsif sql =~ /^\s*UPDATE|^\s*DELETE/i
log(sql, name) do
@connection.execute(sql)
retVal = select_one("SELECT @@ROWCOUNT AS AffectedRows")["AffectedRows"]
end
else
log(sql, name) { @connection.execute(sql) }
end
end
def update(sql, name = nil)
execute(sql, name)
end
alias_method :delete, :update
def begin_db_transaction
@connection["AutoCommit"] = false
rescue Exception => e
@connection["AutoCommit"] = true
end
def commit_db_transaction
@connection.commit
ensure
@connection["AutoCommit"] = true
end
def rollback_db_transaction
@connection.rollback
ensure
@connection["AutoCommit"] = true
end
def quote(value, column = nil)
case value
when String
if column && column.type == :binary
"'#{quote_string(column.string_to_binary(value))}'"
else
"'#{quote_string(value)}'"
end
when NilClass then "NULL"
when TrueClass then '1'
when FalseClass then '0'
when Float, Fixnum, Bignum then value.to_s
when Date then "'#{value.to_s}'"
when Time, DateTime then "'#{value.strftime("%Y-%m-%d %H:%M:%S")}'"
else "'#{quote_string(value.to_yaml)}'"
end
end
def quote_string(string)
string.gsub(/\'/, "''")
end
def quote_column_name(name)
"[#{name}]"
end
def add_limit_offset!(sql, options)
if options.has_key?(:limit) and options.has_key?(:offset) and !options[:limit].nil? and !options[:offset].nil?
options[:order] ||= "id ASC"
total_rows = @connection.select_all("SELECT count(*) as TotalRows from #{get_table_name(sql)}")[0][:TotalRows].to_i
if (options[:limit] + options[:offset]) > total_rows
options[:limit] = (total_rows - options[:offset] > 0) ? (total_rows - options[:offset]) : 1
end
sql.gsub!(/SELECT/i, "SELECT * FROM ( SELECT TOP #{options[:limit]} * FROM ( SELECT TOP #{options[:limit] + options[:offset]}")<<" ) AS tmp1 ORDER BY #{change_order_direction(options[:order])} ) AS tmp2 ORDER BY #{options[:order]}"
else
sql.gsub!(/SELECT/i, "SELECT TOP #{options[:limit]}") unless options[:limit].nil?
end
end
def recreate_database(name)
drop_database(name)
create_database(name)
end
def drop_database(name)
execute "DROP DATABASE #{name}"
end
def create_database(name)
execute "CREATE DATABASE #{name}"
end
private
def select(sql, name = nil)
rows = []
repair_special_columns(sql)
log(sql, name) do
@connection.select_all(sql) do |row|
record = {}
row.column_names.each do |col|
record[col] = row[col]
record[col] = record[col].to_time if record[col].is_a? DBI::Timestamp
end
rows << record
end
end
rows
end
def enable_identity_insert(table_name, enable = true)
if has_identity_column(table_name)
"SET IDENTITY_INSERT #{table_name} #{enable ? 'ON' : 'OFF'}"
end
end
def get_table_name(sql)
if sql =~ /into\s*([^\s]+)\s*|update\s*([^\s]+)\s*/i
$1
elsif sql =~ /from\s*([^\s]+)\s*/i
$1
else
nil
end
end
def has_identity_column(table_name)
!get_identity_column(table_name).nil?
end
def get_identity_column(table_name)
@table_columns = {} unless @table_columns
@table_columns[table_name] = columns(table_name) if @table_columns[table_name] == nil
@table_columns[table_name].each do |col|
return col.name if col.identity
end
return nil
end
def query_contains_identity_column(sql, col)
sql =~ /\[#{col}\]/
end
def change_order_direction(order)
case order
when /DESC/i then order.gsub(/DESC/i, "ASC")
when /ASC/i then order.gsub(/ASC/i, "DESC")
else String.new(order).insert(-1, " DESC")
end
end
def get_special_columns(table_name)
special = []
@table_columns = {} unless @table_columns
@table_columns[table_name] = columns(table_name) if @table_columns[table_name] == nil
@table_columns[table_name].each do |col|
special << col.name if col.is_special
end
special
end
def repair_special_columns(sql)
special_cols = get_special_columns(get_table_name(sql))
for col in special_cols.to_a
sql.gsub!(Regexp.new(" #{col.to_s} = "), " #{col.to_s} LIKE ")
end
sql
end
end #class SQLServerAdapter < AbstractAdapter
end #module ConnectionAdapters
end #module ActiveRecord
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