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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
#
# 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 binary_to_string(value)
value
end
def string_to_binary(value)
value
end
def simplified_type(field_type)
case field_type
when /int/i
:integer
when /float|double|decimal|numeric/i
if @scale == 0
:integer
else
:float
nil
end
when /datetime/i
:datetime
when /timestamp/i
:timestamp
when /time/i
:time
when /date/i
:date
when /clob|text|ntext/i
:text
when /blob|binary|image/i
:binary
when /char|string/i
:string
when /boolean|bit/i
:boolean
end
end
def string_to_time(string)
return string if string.is_a?(Time)
time_array = ParseDate.parsedate(string, true)
time_array.each_index do |i|
case i
when 0
time_array[i] = time_array[i].nil? ? "2000" : time_array[i].to_s
when 1
time_array[i] = time_array[i].nil? ? "Jan" : time_array[i].to_s
when 2
time_array[i] = time_array[i].nil? ? "1" : time_array[i].to_s
when 3
time_array[i] = time_array[i].nil? ? "0" : time_array[i].to_s
when 4
time_array[i] = time_array[i].nil? ? "0" : time_array[i].to_s
when 5
time_array[i] = time_array[i].nil? ? "0" : time_array[i].to_s
end
end
# treat 0000-00-00 00:00:00 as nil
Time.send(Base.default_timezone, *time_array) rescue nil
end
end
# 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.
class SQLServerAdapter < AbstractAdapter
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 = <<EOL
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}'
EOL
result = nil
# Uncomment if you want to have the Columns select statment logged.
# Personnally, I think it adds unneccessary SQL statement 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 update(sql, name = nil)
execute(sql, name)
affected_rows(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 (column && column.type == :boolean ? "'t'" : "1")
when FalseClass then (column && column.type == :boolean ? "'f'" : "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)
raise ArgumentError, 'add_limit_with_offset! not implemented'
end
def add_limit_without_offset!(sql, limit)
raise ArgumentError, 'add_limit_without_offset! not implemented'
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
def execute(sql, name = nil)
if sql =~ /^INSERT/i
insert(sql, name)
else
log(sql, name, @connection) do |conn|
conn.execute(sql)
end
end
end
def adapter_name()
'SqlServer'
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 query_contains_text_column(sql, 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
def affected_rows(name = nil)
sql = "SELECT @@ROWCOUNT AS AffectedRows"
log(sql, name, @connection) do |conn|
conn.select_all(sql) do |row|
return row[:AffectedRows].to_i
end
end
end
end
end
end
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