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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
#
# This adapter will ONLY work on Windows systems, since it relies on Win32OLE, which,
# to my knowledge, is only available on Window.
#
# It 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 need to create
# the ADO directory). Once you've installed that file, you are ready to go.
#
# Options:
#
# * <tt>:host</tt> -- Defaults to localhost
# * <tt>:username</tt> -- Defaults to sa
# * <tt>:password</tt> -- Defaults to nothing
# * <tt>:database</tt> -- The name of the database. No default, must be provided.
#
# I have tested this code on a WindowsXP Pro SP1 system,
# ruby 1.8.2 (2004-07-29) [i386-mswin32], SQL Server 2000.
#
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)
host = config[:host]
username = config[:username] ? config[:username].to_s : 'sa'
password = config[:password].to_s
if config.has_key?(:database)
database = config[:database]
else
raise ArgumentError, "No database specified. Missing argument: database."
end
conn = DBI.connect("DBI:ADO:Provider=SQLOLEDB;Data Source=#{host};Initial Catalog=#{database};User Id=#{username};Password=#{password};")
conn["AutoCommit"] = true
ConnectionAdapters::SQLServerAdapter.new(conn, logger)
end
end
module ConnectionAdapters
class ColumnWithIdentity < Column# :nodoc:
attr_reader :identity, :scale
def initialize(name, default, sql_type = nil, is_identity = false, scale_value = 0)
super(name, default, sql_type)
@scale = scale_value
@identity = is_identity
end
def simplified_type(field_type)
case field_type
when /int|bigint|smallint|tinyint/i : :integer
when /float|double|decimal|money|numeric|real|smallmoney/i : @scale == 0 ? :integer : :float
when /datetime|smalldatetime/i : :datetime
when /timestamp/i : :timestamp
when /time/i : :time
when /text|ntext/i : :text
when /binary|image|varbinary/i : :binary
when /char|nchar|nvarchar|string|varchar/i : :string
when /bit/i : :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_date_or_time(value)
when :timestamp then cast_to_time(value)
when :time then cast_to_time(value)
else value
end
end
def cast_to_date_or_time(value)
return value if value.is_a?(Date)
guess_date_or_time (value.is_a?(Time)) ? value : cast_to_time(value)
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
end
def guess_date_or_time(value)
(value.hour == 0 and value.min == 0 and value.sec == 0) ?
Date.new(value.year, value.month, value.day) : 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"
"%00"
when "\n"
"%01"
when "\0"
"%02"
when "\x1a"
"%03"
end
end
end
def binary_to_string(value)
value.gsub(/(%00|%01|%02|%03)/) do
case $1
when "%00"
"\r"
when "%01"
"\n"
when "%02\0"
"\0"
when "%03"
"\x1a"
end
end
end
end
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)
add_limit!(sql, 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}'"
result = nil
# Uncomment if you want to have the Columns select statment logged.
# Personnally, I think it adds unneccessary bloat to the log.
# If you do uncomment, make sure to comment the "result" line that follows
log(sql, name, @connection) { |conn| result = conn.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)
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
# Coulnd't turn on IDENTITY_INSERT
end
end
end
log(sql, name, @connection) do |conn|
conn.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
# Couldn't turn off IDENTITY_INSERT
end
end
end
end
def execute(sql, name = nil)
if sql =~ /^INSERT/i
insert(sql, name)
elsif sql =~ /^UPDATE|DELETE/i
log(sql, name, @connection) do |conn|
conn.execute(sql)
retVal = select_one("SELECT @@ROWCOUNT AS AffectedRows")["AffectedRows"]
end
else
log(sql, name, @connection) do |conn|
conn.execute(sql)
end
end
end
def update(sql, name = nil)
execute(sql, name)
end
alias_method :delete, :update
def begin_db_transaction
begin
@connection["AutoCommit"] = false
rescue Exception => e
@connection["AutoCommit"] = true
end
end
def commit_db_transaction
begin
@connection.commit
ensure
@connection["AutoCommit"] = true
end
end
def rollback_db_transaction
begin
@connection.rollback
ensure
@connection["AutoCommit"] = true
end
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(s)
s.gsub(/\'/, "''")
end
def quote_column_name(name)
"[#{name}]"
end
def add_limit_with_offset!(sql, limit, offset)
order_by = sql.include?("ORDER BY") ? get_order_by(sql.sub(/.*ORDER\sBY./, "")) : nil
sql.gsub!(/SELECT/i, "SELECT * FROM ( SELECT TOP #{limit} * FROM ( SELECT TOP #{limit + offset}")<<" ) AS tmp1 ORDER BY #{order_by[1]} ) AS tmp2 ORDER BY #{order_by[0]}"
end
def add_limit_without_offset!(sql, limit)
limit.nil? ? sql : sql.gsub!(/SELECT/i, "SELECT TOP #{limit}")
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 = []
log(sql, name, @connection) do |conn|
conn.select_all(sql) do |row|
record = {}
row.column_names.each do |col|
record[col] = row[col]
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*/i or
sql =~ /update\s*([^\s]+)\s*/i
$1
else
nil
end
end
def has_identity_column(table_name)
return get_identity_column(table_name) != nil
end
def get_identity_column(table_name)
if not @table_columns
@table_columns = {}
end
if @table_columns[table_name] == nil
@table_columns[table_name] = columns(table_name)
end
@table_columns[table_name].each do |col|
return col.name if col.identity
end
return nil
end
def query_contains_identity_column(sql, col)
return sql =~ /[\(\.\,]\s*#{col}/
end
def get_order_by(sql)
return sql, sql.gsub(/\s*DESC\s*/, "").gsub(/\s*ASC\s*/, " DESC")
end
def get_offset_amount(limit)
limit = limit.gsub!(/.OFFSET./i, ",").split(',')
return limit[0].to_i, limit[0].to_i+limit[1].to_i
end
end
end
end
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