Class: ActiveRecord::ConnectionAdapters::SQLServerAdapter

Inherits:
AbstractAdapter
  • Object
show all
Defined in:
lib/active_record/connection_adapters/sqlserver_adapter.rb

Overview

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 ruby-dbi.sourceforge.net/ unzip it, and copy the file from src/lib/dbd_ado/ADO.rb to X:/Ruby/lib/ruby/site_ruby/1.8/DBD/ADO/ADO.rb

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 www.ch-werner.de/rubyodbc/

Options:

  • :mode – ADO or ODBC. Defaults to ADO.

  • :username – Defaults to sa.

  • :password – Defaults to empty string.

  • :windows_auth – Defaults to “User ID=#username;Password=#password”

ADO specific options:

  • :host – Defaults to localhost.

  • :database – The name of the database. No default, must be provided.

  • :windows_auth – Use windows authentication instead of username/password.

ODBC specific options:

  • :dsn – Defaults to nothing.

Constant Summary collapse

ADAPTER_NAME = 
'SQLServer'.freeze
VERSION = 
'2.2.5'.freeze
DATABASE_VERSION_REGEXP = 
/Microsoft SQL Server\s+(\d{4})/
SUPPORTED_VERSIONS = 
[2000,2005].freeze
LIMITABLE_TYPES = 
['string','integer','float','char','nchar','varchar','nvarchar'].freeze

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(connection, logger, connection_options = nil) ⇒ SQLServerAdapter

Returns a new instance of SQLServerAdapter.



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# File 'lib/active_record/connection_adapters/sqlserver_adapter.rb', line 168

def initialize(connection, logger, connection_options=nil)
  super(connection, logger)
  @connection_options = connection_options
  initialize_sqlserver_caches
  unless SUPPORTED_VERSIONS.include?(database_year)
    raise NotImplementedError, "Currently, only #{SUPPORTED_VERSIONS.to_sentence} are supported."
  end
end

Class Method Details

.type_limitable?(type) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/active_record/connection_adapters/sqlserver_adapter.rb', line 162

def type_limitable?(type)
  LIMITABLE_TYPES.include?(type.to_s)
end

Instance Method Details

#active? ⇒ Boolean

CONNECTION MANAGEMENT ====================================#

Returns:

  • (Boolean) 


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# File 'lib/active_record/connection_adapters/sqlserver_adapter.rb', line 288

def active?
  raw_connection.execute("SELECT 1").finish
  true
rescue DBI::DatabaseError, DBI::InterfaceError
  false
end

#adapter_name ⇒ Object

ABSTRACT ADAPTER =========================================#



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# File 'lib/active_record/connection_adapters/sqlserver_adapter.rb', line 179

def adapter_name
  ADAPTER_NAME
end

#add_column(table_name, column_name, type, options = {}) ⇒ Object 



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# File 'lib/active_record/connection_adapters/sqlserver_adapter.rb', line 520

def add_column(table_name, column_name, type, options = {})
  super
  remove_sqlserver_columns_cache_for(table_name)
end

#add_limit_offset!(sql, options) ⇒ Object 



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# File 'lib/active_record/connection_adapters/sqlserver_adapter.rb', line 339

def add_limit_offset!(sql, options)
  # Validate and/or convert integers for :limit and :offets options.
  if options[:offset]
    raise ArgumentError, "offset should have a limit" unless options[:limit]
    unless options[:offset].kind_of?(Integer)
      if options[:offset] =~ /^\d+$/
        options[:offset] = options[:offset].to_i
      else
        raise ArgumentError, "offset should be an integer"
      end
    end
  end
  if options[:limit] && !(options[:limit].kind_of?(Integer))
    if options[:limit] =~ /^\d+$/
      options[:limit] = options[:limit].to_i
    else
      raise ArgumentError, "limit should be an integer"
    end
  end
  # The business of adding limit/offset
  if options[:limit] and options[:offset]
    total_rows = select_value("SELECT count(*) as TotalRows from (#{sql.sub(/\bSELECT(\s+DISTINCT)?\b/i, "SELECT#{$1} TOP 1000000000")}) tally").to_i
    if (options[:limit] + options[:offset]) >= total_rows
      options[:limit] = (total_rows - options[:offset] >= 0) ? (total_rows - options[:offset]) : 0
    end
    # Make sure we do not need a special limit/offset for association limiting. http://gist.github.com/25118
    add_limit_offset_for_association_limiting!(sql,options) and return if sql_for_association_limiting?(sql)
    # Wrap the SQL query in a bunch of outer SQL queries that emulate proper LIMIT,OFFSET support.
    sql.sub!(/^\s*SELECT(\s+DISTINCT)?/i, "SELECT * FROM (SELECT TOP #{options[:limit]} * FROM (SELECT#{$1} TOP #{options[:limit] + options[:offset]}")
    sql << ") AS tmp1"
    if options[:order]
      order = options[:order].split(',').map do |field|
        order_by_column, order_direction = field.split(" ")
        order_by_column = quote_column_name(order_by_column)
        # Investigate the SQL query to figure out if the order_by_column has been renamed.
        if sql =~ /#{Regexp.escape(order_by_column)} AS (t\d_r\d\d?)/
          # Fx "[foo].[bar] AS t4_r2" was found in the SQL. Use the column alias (ie 't4_r2') for the subsequent orderings
          order_by_column = $1
        elsif order_by_column =~ /\w+\.\[?(\w+)\]?/
          order_by_column = $1
        else
          # It doesn't appear that the column name has been renamed as part of the query. Use just the column
          # name rather than the full identifier for the outer queries.
          order_by_column = order_by_column.split('.').last
        end
        # Put the column name and eventual direction back together
        [order_by_column, order_direction].join(' ').strip
      end.join(', ')
      sql << " ORDER BY #{change_order_direction(order)}) AS tmp2 ORDER BY #{order}"
    else
      sql << ") AS tmp2"
    end
  elsif options[:limit] && sql !~ /^\s*SELECT (@@|COUNT\()/i
    if md = sql.match(/^(\s*SELECT)(\s+DISTINCT)?(.*)/im)
      sql.replace "#{md[1]}#{md[2]} TOP #{options[:limit]}#{md[3]}"
    else
      # Account for building SQL fragments without SELECT yet. See #update_all and #limited_update_conditions.
      sql.replace "TOP #{options[:limit]} #{sql}"
    end
  end
end

#add_lock!(sql, options) ⇒ Object 



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# File 'lib/active_record/connection_adapters/sqlserver_adapter.rb', line 401

def add_lock!(sql, options)
  # http://blog.sqlauthority.com/2007/04/27/sql-server-2005-locking-hints-and-examples/
  return unless options[:lock]
  lock_type = options[:lock] == true ? 'WITH(HOLDLOCK, ROWLOCK)' : options[:lock]
  from_table = sql.match(/FROM(.*)WHERE/im)[1]
  sql.sub! from_table, "#{from_table}#{lock_type} "
end

#add_order_by_for_association_limiting!(sql, options) ⇒ Object 



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# File 'lib/active_record/connection_adapters/sqlserver_adapter.rb', line 579

def add_order_by_for_association_limiting!(sql, options)
  # Disertation http://gist.github.com/24073
  # Information http://weblogs.sqlteam.com/jeffs/archive/2007/12/13/select-distinct-order-by-error.aspx
  return sql if options[:order].blank?
  columns = sql.match(/SELECT\s+DISTINCT(.*)FROM/)[1].strip
  sql.sub!(/SELECT\s+DISTINCT/,'SELECT')
  sql << "GROUP BY #{columns} ORDER BY #{order_to_min_set(options[:order])}"
end

#begin_db_transaction ⇒ Object 



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# File 'lib/active_record/connection_adapters/sqlserver_adapter.rb', line 327

def begin_db_transaction
  do_execute "BEGIN TRANSACTION"
end

#case_sensitive_equality_operator ⇒ Object 



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# File 'lib/active_record/connection_adapters/sqlserver_adapter.rb', line 413

def case_sensitive_equality_operator
  "COLLATE Latin1_General_CS_AS ="
end

#change_column(table_name, column_name, type, options = {}) ⇒ Object 



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# File 'lib/active_record/connection_adapters/sqlserver_adapter.rb', line 535

def change_column(table_name, column_name, type, options = {})
  sql_commands = []
  change_column_sql = "ALTER TABLE #{quote_table_name(table_name)} ALTER COLUMN #{quote_column_name(column_name)} #{type_to_sql(type, options[:limit], options[:precision], options[:scale])}"
  change_column_sql << " NOT NULL" if options[:null] == false
  sql_commands << change_column_sql
  if options_include_default?(options)
    remove_default_constraint(table_name, column_name)
    sql_commands << "ALTER TABLE #{quote_table_name(table_name)} ADD CONSTRAINT #{default_name(table_name,column_name)} DEFAULT #{quote(options[:default])} FOR #{quote_column_name(column_name)}"
  end
  sql_commands.each { |c| do_execute(c) }
  remove_sqlserver_columns_cache_for(table_name)
end

#change_column_default(table_name, column_name, default) ⇒ Object 



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# File 'lib/active_record/connection_adapters/sqlserver_adapter.rb', line 548

def change_column_default(table_name, column_name, default)
  remove_default_constraint(table_name, column_name)
  do_execute "ALTER TABLE #{quote_table_name(table_name)} ADD CONSTRAINT #{default_name(table_name, column_name)} DEFAULT #{quote(default)} FOR #{quote_column_name(column_name)}"
  remove_sqlserver_columns_cache_for(table_name)
end

#change_column_null(table_name, column_name, null, default = nil) ⇒ Object 



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# File 'lib/active_record/connection_adapters/sqlserver_adapter.rb', line 588

def change_column_null(table_name, column_name, null, default = nil)
  column = column_for(table_name,column_name)
  unless null || default.nil?
    do_execute("UPDATE #{quote_table_name(table_name)} SET #{quote_column_name(column_name)}=#{quote(default)} WHERE #{quote_column_name(column_name)} IS NULL")
  end
  sql = "ALTER TABLE #{table_name} ALTER COLUMN #{quote_column_name(column_name)} #{type_to_sql column.type, column.limit, column.precision, column.scale}"
  sql << " NOT NULL" unless null
  do_execute sql
end

#columns(table_name, name = nil) ⇒ Object 



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# File 'lib/active_record/connection_adapters/sqlserver_adapter.rb', line 497

def columns(table_name, name = nil)
  return [] if table_name.blank?
  cache_key = unqualify_table_name(table_name)
  @sqlserver_columns_cache[cache_key] ||= column_definitions(table_name).collect do |ci|
    sqlserver_options = ci.except(:name,:default_value,:type,:null)
    SQLServerColumn.new ci[:name], ci[:default_value], ci[:type], ci[:null], sqlserver_options
  end
end

#commit_db_transaction ⇒ Object 



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# File 'lib/active_record/connection_adapters/sqlserver_adapter.rb', line 331

def commit_db_transaction
  do_execute "COMMIT TRANSACTION"
end

#create_database(name) ⇒ Object 



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# File 'lib/active_record/connection_adapters/sqlserver_adapter.rb', line 635

def create_database(name)
  do_execute "CREATE DATABASE #{name}"
end

#create_table(table_name, options = {}) ⇒ Object 



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# File 'lib/active_record/connection_adapters/sqlserver_adapter.rb', line 506

def create_table(table_name, options = {})
  super
  remove_sqlserver_columns_cache_for(table_name)
end

#current_database ⇒ Object 



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# File 'lib/active_record/connection_adapters/sqlserver_adapter.rb', line 639

def current_database
  select_value 'SELECT DB_NAME()'
end

#database_version ⇒ Object 



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# File 'lib/active_record/connection_adapters/sqlserver_adapter.rb', line 191

def database_version
  @database_version ||= info_schema_query { select_value('SELECT @@version') }
end

#database_year ⇒ Object 



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# File 'lib/active_record/connection_adapters/sqlserver_adapter.rb', line 195

def database_year
  DATABASE_VERSION_REGEXP.match(database_version)[1].to_i
end

#disable_referential_integrity(&block) ⇒ Object

REFERENTIAL INTEGRITY ====================================#



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# File 'lib/active_record/connection_adapters/sqlserver_adapter.rb', line 279

def disable_referential_integrity(&block)
  do_execute "EXEC sp_MSForEachTable 'ALTER TABLE ? NOCHECK CONSTRAINT ALL'"
  yield
ensure
  do_execute "EXEC sp_MSForEachTable 'ALTER TABLE ? CHECK CONSTRAINT ALL'"
end

#disconnect! ⇒ Object 



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# File 'lib/active_record/connection_adapters/sqlserver_adapter.rb', line 303

def disconnect!
  raw_connection.disconnect rescue nil
end

#drop_database(name) ⇒ Object 



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# File 'lib/active_record/connection_adapters/sqlserver_adapter.rb', line 616

def drop_database(name)
  retry_count = 0
  max_retries = 1
  begin
    do_execute "DROP DATABASE #{name}"
  rescue ActiveRecord::StatementInvalid => err
    # Remove existing connections and rollback any transactions if we received the message
    #  'Cannot drop the database 'test' because it is currently in use'
    if err.message =~ /because it is currently in use/
      raise if retry_count >= max_retries
      retry_count += 1
      remove_database_connections_and_rollback(name)
      retry
    else
      raise
    end
  end
end

#drop_table(table_name, options = {}) ⇒ Object 



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# File 'lib/active_record/connection_adapters/sqlserver_adapter.rb', line 515

def drop_table(table_name, options = {})
  super
  remove_sqlserver_columns_cache_for(table_name)
end

#empty_insert_statement(table_name) ⇒ Object 



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# File 'lib/active_record/connection_adapters/sqlserver_adapter.rb', line 409

def empty_insert_statement(table_name)
  "INSERT INTO #{quote_table_name(table_name)} DEFAULT VALUES"
end

#execute(sql, name = nil, &block) ⇒ Object 



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# File 'lib/active_record/connection_adapters/sqlserver_adapter.rb', line 318

def execute(sql, name = nil, &block)
  if table_name = query_requires_identity_insert?(sql)
    handle = with_identity_insert_enabled(table_name) { raw_execute(sql,name,&block) }
  else
    handle = raw_execute(sql,name,&block)
  end
  finish_statement_handle(handle)
end

#finish_statement_handle(handle) ⇒ Object 



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# File 'lib/active_record/connection_adapters/sqlserver_adapter.rb', line 307

def finish_statement_handle(handle)
  handle.finish if handle && handle.respond_to?(:finish) && !handle.finished?
  handle
end

#indexes(table_name, name = nil) ⇒ Object 



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# File 'lib/active_record/connection_adapters/sqlserver_adapter.rb', line 480

def indexes(table_name, name = nil)
  select("EXEC sp_helpindex #{quote_table_name(table_name)}",name).inject([]) do |indexes,index|
    if index['index_description'] =~ /primary key/
      indexes
    else
      name    = index['index_name']
      unique  = index['index_description'] =~ /unique/
      columns = index['index_keys'].split(',').map do |column|
        column.strip!
        column.gsub! '(-)', '' if column.ends_with?('(-)')
        column
      end
      indexes << IndexDefinition.new(table_name, name, unique, columns)
    end
  end
end

#inspect ⇒ Object 



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# File 'lib/active_record/connection_adapters/sqlserver_adapter.rb', line 215

def inspect
  "#<#{self.class} version: #{version}, year: #{database_year}, connection_options: #{@connection_options.inspect}>"
end

#limited_update_conditions(where_sql, quoted_table_name, quoted_primary_key) ⇒ Object 



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# File 'lib/active_record/connection_adapters/sqlserver_adapter.rb', line 417

def limited_update_conditions(where_sql, quoted_table_name, quoted_primary_key)
  match_data = where_sql.match(/(.*)WHERE/)
  limit = match_data[1]
  where_sql.sub!(limit,'')
  "WHERE #{quoted_primary_key} IN (SELECT #{limit} #{quoted_primary_key} FROM #{quoted_table_name} #{where_sql})"
end

#native_binary_database_type ⇒ Object 



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# File 'lib/active_record/connection_adapters/sqlserver_adapter.rb', line 223

def native_binary_database_type
  self.class.native_binary_database_type || (sqlserver_2005? ? 'varbinary(max)' : 'image')
end

#native_database_types ⇒ Object

SCHEMA STATEMENTS ========================================#



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# File 'lib/active_record/connection_adapters/sqlserver_adapter.rb', line 426

def native_database_types
  {
    :primary_key  => "int NOT NULL IDENTITY(1, 1) PRIMARY KEY",
    :string       => { :name => "varchar", :limit => 255  },
    :text         => { :name =>  native_text_database_type },
    :integer      => { :name => "int", :limit => 4 },
    :float        => { :name => "float", :limit => 8 },
    :decimal      => { :name => "decimal" },
    :datetime     => { :name => "datetime" },
    :timestamp    => { :name => "datetime" },
    :time         => { :name => "datetime" },
    :date         => { :name => "datetime" },
    :binary       => { :name =>  native_binary_database_type },
    :boolean      => { :name => "bit"},
    # These are custom types that may move somewhere else for good schema_dumper.rb hacking to output them.
    :char         => { :name => 'char' },
    :varchar_max  => { :name => 'varchar(max)' },
    :nchar        => { :name => "nchar" },
    :nvarchar     => { :name => "nvarchar", :limit => 255 },
    :nvarchar_max => { :name => "nvarchar(max)" },
    :ntext        => { :name => "ntext" }
  }
end

#native_text_database_type ⇒ Object 



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# File 'lib/active_record/connection_adapters/sqlserver_adapter.rb', line 219

def native_text_database_type
  self.class.native_text_database_type || (sqlserver_2005? ? 'varchar(max)' : 'text')
end

#pk_and_sequence_for(table_name) ⇒ Object 



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# File 'lib/active_record/connection_adapters/sqlserver_adapter.rb', line 598

def pk_and_sequence_for(table_name)
  idcol = identity_column(table_name)
  idcol ? [idcol.name,nil] : nil
end

#quote(value, column = nil) ⇒ Object

QUOTING ==================================================#



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# File 'lib/active_record/connection_adapters/sqlserver_adapter.rb', line 229

def quote(value, column = nil)
  case value
  when String, ActiveSupport::Multibyte::Chars
    if column && column.type == :binary
      column.class.string_to_binary(value)
    elsif column && column.respond_to?(:is_utf8?) && column.is_utf8?
      quoted_utf8_value(value)
    else
      super
    end
  else
    super
  end
end

#quote_column_name(column_name) ⇒ Object 



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# File 'lib/active_record/connection_adapters/sqlserver_adapter.rb', line 248

def quote_column_name(column_name)
  column_name.to_s.split('.').map{ |name| "[#{name}]" }.join('.')
end

#quote_string(string) ⇒ Object 



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# File 'lib/active_record/connection_adapters/sqlserver_adapter.rb', line 244

def quote_string(string)
  string.to_s.gsub(/\'/, "''")
end

#quote_table_name(table_name) ⇒ Object 



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# File 'lib/active_record/connection_adapters/sqlserver_adapter.rb', line 252

def quote_table_name(table_name)
  return table_name if table_name =~ /^\[.*\]$/
  quote_column_name(table_name)
end

#quoted_date(value) ⇒ Object 



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# File 'lib/active_record/connection_adapters/sqlserver_adapter.rb', line 265

def quoted_date(value)
  if value.acts_like?(:time) && value.respond_to?(:usec)
    "#{super}.#{sprintf("%03d",value.usec/1000)}"
  else
    super
  end
end

#quoted_false ⇒ Object 



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# File 'lib/active_record/connection_adapters/sqlserver_adapter.rb', line 261

def quoted_false
  '0'
end

#quoted_true ⇒ Object 



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# File 'lib/active_record/connection_adapters/sqlserver_adapter.rb', line 257

def quoted_true
  '1'
end

#quoted_utf8_value(value) ⇒ Object 



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# File 'lib/active_record/connection_adapters/sqlserver_adapter.rb', line 273

def quoted_utf8_value(value)
  "N'#{quote_string(value)}'"
end

#reconnect! ⇒ Object 



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# File 'lib/active_record/connection_adapters/sqlserver_adapter.rb', line 295

def reconnect!
  disconnect!
  @connection = DBI.connect(*@connection_options)
rescue DBI::DatabaseError => e
  @logger.warn "#{adapter_name} reconnection failed: #{e.message}" if @logger
  false
end

#recreate_database(name) ⇒ Object

RAKE UTILITY METHODS =====================================#



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# File 'lib/active_record/connection_adapters/sqlserver_adapter.rb', line 605

def recreate_database(name)
  existing_database = current_database.to_s
  if name.to_s == existing_database
    do_execute 'USE master' 
  end
  drop_database(name)
  create_database(name)
ensure
  do_execute "USE #{existing_database}" if name.to_s == existing_database 
end

#remove_column(table_name, *column_names) ⇒ Object 



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# File 'lib/active_record/connection_adapters/sqlserver_adapter.rb', line 525

def remove_column(table_name, *column_names)
  column_names.flatten.each do |column_name|
    remove_check_constraints(table_name, column_name)
    remove_default_constraint(table_name, column_name)
    remove_indexes(table_name, column_name)
    do_execute "ALTER TABLE #{quote_table_name(table_name)} DROP COLUMN #{quote_column_name(column_name)}"
  end
  remove_sqlserver_columns_cache_for(table_name)
end

#remove_database_connections_and_rollback(name) ⇒ Object 



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# File 'lib/active_record/connection_adapters/sqlserver_adapter.rb', line 643

def remove_database_connections_and_rollback(name)
  # This should disconnect all other users and rollback any transactions for SQL 2000 and 2005
  # http://sqlserver2000.databases.aspfaq.com/how-do-i-drop-a-sql-server-database.html
  do_execute "ALTER DATABASE #{name} SET SINGLE_USER WITH ROLLBACK IMMEDIATE"
end

#remove_index(table_name, options = {}) ⇒ Object 



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# File 'lib/active_record/connection_adapters/sqlserver_adapter.rb', line 560

def remove_index(table_name, options = {})
  do_execute "DROP INDEX #{table_name}.#{quote_column_name(index_name(table_name, options))}"
end

#rename_column(table_name, column_name, new_column_name) ⇒ Object 



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# File 'lib/active_record/connection_adapters/sqlserver_adapter.rb', line 554

def rename_column(table_name, column_name, new_column_name)
  column_for(table_name,column_name)
  do_execute "EXEC sp_rename '#{table_name}.#{column_name}', '#{new_column_name}', 'COLUMN'"
  remove_sqlserver_columns_cache_for(table_name)
end

#rename_table(table_name, new_name) ⇒ Object 



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# File 'lib/active_record/connection_adapters/sqlserver_adapter.rb', line 511

def rename_table(table_name, new_name)
  do_execute "EXEC sp_rename '#{table_name}', '#{new_name}'"
end

#rollback_db_transaction ⇒ Object 



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# File 'lib/active_record/connection_adapters/sqlserver_adapter.rb', line 335

def rollback_db_transaction
  do_execute "ROLLBACK TRANSACTION" rescue nil
end

#select_rows(sql, name = nil) ⇒ Object

DATABASE STATEMENTS ======================================#



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# File 'lib/active_record/connection_adapters/sqlserver_adapter.rb', line 314

def select_rows(sql, name = nil)
  raw_select(sql,name).last
end

#sqlserver? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/active_record/connection_adapters/sqlserver_adapter.rb', line 199

def sqlserver?
  true
end

#sqlserver_2000? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/active_record/connection_adapters/sqlserver_adapter.rb', line 203

def sqlserver_2000?
  database_year == 2000
end

#sqlserver_2005? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/active_record/connection_adapters/sqlserver_adapter.rb', line 207

def sqlserver_2005?
  database_year == 2005
end

#supports_ddl_transactions? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/active_record/connection_adapters/sqlserver_adapter.rb', line 187

def supports_ddl_transactions?
  true
end

#supports_migrations? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/active_record/connection_adapters/sqlserver_adapter.rb', line 183

def supports_migrations?
  true
end

#table_alias_length ⇒ Object 



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# File 'lib/active_record/connection_adapters/sqlserver_adapter.rb', line 450

def table_alias_length
  128
end

#table_exists?(table_name) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/active_record/connection_adapters/sqlserver_adapter.rb', line 476

def table_exists?(table_name)
  super || views.include?(table_name.to_s)
end

#tables(name = nil) ⇒ Object 



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# File 'lib/active_record/connection_adapters/sqlserver_adapter.rb', line 454

def tables(name = nil)
  info_schema_query do
    select_values "SELECT TABLE_NAME FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_TYPE = 'BASE TABLE' AND TABLE_NAME <> 'dtproperties'"
  end
end

#type_to_sql(type, limit = nil, precision = nil, scale = nil) ⇒ Object 



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# File 'lib/active_record/connection_adapters/sqlserver_adapter.rb', line 564

def type_to_sql(type, limit = nil, precision = nil, scale = nil)
  limit = nil unless self.class.type_limitable?(type)
  case type.to_s
  when 'integer'
    case limit
      when 1..2       then  'smallint'
      when 3..4, nil  then  'integer'
      when 5..8       then  'bigint'
      else raise(ActiveRecordError, "No integer type has byte size #{limit}. Use a numeric with precision 0 instead.")
    end
  else
    super
  end
end

#version ⇒ Object 



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# File 'lib/active_record/connection_adapters/sqlserver_adapter.rb', line 211

def version
  self.class::VERSION
end

#view_information(table_name) ⇒ Object 



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# File 'lib/active_record/connection_adapters/sqlserver_adapter.rb', line 465

def view_information(table_name)
  table_name = unqualify_table_name(table_name)
  @sqlserver_view_information_cache[table_name] ||= 
    info_schema_query { select_one("SELECT * FROM INFORMATION_SCHEMA.VIEWS WHERE TABLE_NAME = '#{table_name}'") }
end

#view_table_name(table_name) ⇒ Object 



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# File 'lib/active_record/connection_adapters/sqlserver_adapter.rb', line 471

def view_table_name(table_name)
  view_info = view_information(table_name)
  view_info ? get_table_name(view_info['VIEW_DEFINITION']) : table_name
end

#views(name = nil) ⇒ Object 



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# File 'lib/active_record/connection_adapters/sqlserver_adapter.rb', line 460

def views(name = nil)
  @sqlserver_views_cache ||= 
    info_schema_query { select_values("SELECT TABLE_NAME FROM INFORMATION_SCHEMA.VIEWS WHERE TABLE_NAME NOT IN ('sysconstraints','syssegments')") }
end