Module: ArJdbc::MSSQL

Includes:
ExplainSupport, LimitHelpers, Utils
Included in:
ActiveRecord::ConnectionAdapters::MSSQLAdapter
Defined in:
lib/arjdbc/mssql/utils.rb,
lib/arjdbc/mssql/column.rb,
lib/arjdbc/mssql/adapter.rb,
lib/arjdbc/mssql/lock_methods.rb,
lib/arjdbc/mssql/limit_helpers.rb,
lib/arjdbc/mssql/explain_support.rb

Defined Under Namespace

Modules: Column, ExplainSupport, LimitHelpers, LockMethods, Utils

Constant Summary collapse

ADAPTER_NAME = 
'MSSQL'.freeze

Constants included from ExplainSupport

ExplainSupport::DISABLED

Constants included from Utils

Utils::GET_TABLE_NAME_FROM_RE, Utils::GET_TABLE_NAME_INSERT_UPDATE_RE

Class Method Summary collapse

Instance Method Summary collapse

Methods included from ExplainSupport

#explain, #set_showplan_option, #supports_explain?, #with_showplan_on

Methods included from Utils

get_table_name, remove_identifier_delimiters, unqualify_db_name, unqualify_table_name, unqualify_table_schema, unquote_column_name, unquote_string, unquote_table_name

Class Method Details

.arel2_visitors(config) ⇒ Object

Deprecated.

no longer used

See Also:

  • ActiveRecord::ConnectionAdapters::JdbcAdapter#arel2_visitors


75
76
77
78
 
# File 'lib/arjdbc/mssql/adapter.rb', line 75

def self.arel2_visitors(config)
  visitor = arel_visitor_type(config)
  { 'mssql' => visitor, 'jdbcmssql' => visitor, 'sqlserver' => visitor }
end

.arel_visitor_type(config) ⇒ Object

See Also:



67
68
69
70
71
 
# File 'lib/arjdbc/mssql/adapter.rb', line 67

def self.arel_visitor_type(config)
  require 'arel/visitors/sql_server'
  ( config && config[:sqlserver_version].to_s == '2000' ) ?
    ::Arel::Visitors::SQLServer2000 : ::Arel::Visitors::SQLServer
end

.column_selector ⇒ Object

See Also:

  • ActiveRecord::ConnectionAdapters::JdbcColumn#column_types


5
6
7
 
# File 'lib/arjdbc/mssql/column.rb', line 5

def self.column_selector
  [ /sqlserver|tds|Microsoft SQL/i, lambda { |config, column| column.extend(Column) } ]
end

.jdbc_connection_class ⇒ Object

See Also:



59
60
61
 
# File 'lib/arjdbc/mssql/adapter.rb', line 59

def self.jdbc_connection_class
  ::ActiveRecord::ConnectionAdapters::MSSQLJdbcConnection
end

.update_lob_values=(update) ⇒ Object

See Also:

  • #update_lob_values?


46
 
# File 'lib/arjdbc/mssql/adapter.rb', line 46

def self.update_lob_values=(update); @@update_lob_values = update; end

.update_lob_values? ⇒ Boolean

Note:

This only applies when prepared statements are not used.

Updating records with LOB values (binary/text columns) in a separate statement can be disabled using :

ArJdbc::MSSQL.update_lob_values = false

Returns:

  • (Boolean) 


44
 
# File 'lib/arjdbc/mssql/adapter.rb', line 44

def self.update_lob_values?; @@update_lob_values; end

Instance Method Details

#adapter_name ⇒ Object 



241
242
243
 
# File 'lib/arjdbc/mssql/adapter.rb', line 241

def adapter_name
  ADAPTER_NAME
end

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

Adds a new column to the named table.



361
362
363
364
365
366
367
368
 
# File 'lib/arjdbc/mssql/adapter.rb', line 361

def add_column(table_name, column_name, type, options = {})
  clear_cached_table(table_name)
  add_column_sql = "ALTER TABLE #{quote_table_name(table_name)} ADD #{quote_column_name(column_name)} #{type_to_sql(type, options[:limit], options[:precision], options[:scale])}"
  add_column_options!(add_column_sql, options)
  # TODO: Add support to mimic date columns, using constraints to mark them as such in the database
  # add_column_sql << " CONSTRAINT ck__#{table_name}__#{column_name}__date_only CHECK ( CONVERT(CHAR(12), #{quote_column_name(column_name)}, 14)='00:00:00:000' )" if type == :date
  execute(add_column_sql)
end

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



403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
 
# File 'lib/arjdbc/mssql/adapter.rb', line 403

def change_column(table_name, column_name, type, options = {})
  column = columns(table_name).find { |c| c.name.to_s == column_name.to_s }

  indexes = EMPTY_ARRAY
  if options_include_default?(options) || (column && column.type != type.to_sym)
    remove_default_constraint(table_name, column_name)
    indexes = indexes(table_name).select{ |index| index.columns.include?(column_name.to_s) }
    remove_indexes(table_name, column_name)
  end

  if ! options[:null].nil? && options[:null] == false && ! options[:default].nil?
    execute "UPDATE #{quote_table_name(table_name)} SET #{quote_column_name(column_name)}=#{quote_default_value(options[:default], column)} WHERE #{quote_column_name(column_name)} IS NULL"
    clear_cached_table(table_name)
  end
  change_column_type(table_name, column_name, type, options)
  change_column_default(table_name, column_name, options[:default]) if options_include_default?(options)

  indexes.each do |index| # add any removed indexes back
    index_columns = index.columns.map { |c| quote_column_name(c) }.join(', ')
    execute "CREATE INDEX #{quote_table_name(index.name)} ON #{quote_table_name(table_name)} (#{index_columns})"
  end
end

#change_column_default(table_name, column_name, default) ⇒ Object 



434
435
436
437
438
439
440
441
442
 
# File 'lib/arjdbc/mssql/adapter.rb', line 434

def change_column_default(table_name, column_name, default)
  remove_default_constraint(table_name, column_name)
  unless default.nil?
    column = columns(table_name).find { |c| c.name.to_s == column_name.to_s }
    result = execute "ALTER TABLE #{quote_table_name(table_name)} ADD CONSTRAINT DF_#{table_name}_#{column_name} DEFAULT #{quote_default_value(default, column)} FOR #{quote_column_name(column_name)}"
    clear_cached_table(table_name)
    result
  end
end

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



426
427
428
429
430
431
432
 
# File 'lib/arjdbc/mssql/adapter.rb', line 426

def change_column_type(table_name, column_name, type, options = {})
  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])}"
  sql << (options[:null] ? " NULL" : " NOT NULL") if options.has_key?(:null)
  result = execute(sql)
  clear_cached_table(table_name)
  result
end

#change_order_direction(order) ⇒ Object 



245
246
247
248
249
250
251
252
253
254
 
# File 'lib/arjdbc/mssql/adapter.rb', line 245

def change_order_direction(order)
  asc, desc = /\bASC\b/i, /\bDESC\b/i
  order.split(",").collect do |fragment|
    case fragment
    when desc  then fragment.gsub(desc, "ASC")
    when asc   then fragment.gsub(asc, "DESC")
    else "#{fragment.split(',').join(' DESC,')} DESC"
    end
  end.join(",")
end

#charset ⇒ Object 



305
306
307
 
# File 'lib/arjdbc/mssql/adapter.rb', line 305

def charset
  select_value "SELECT SERVERPROPERTY('SqlCharSetName')"
end

#clear_cached_table(table_name) ⇒ Object 



550
551
552
 
# File 'lib/arjdbc/mssql/adapter.rb', line 550

def clear_cached_table(table_name)
  ( @table_columns ||= {} ).delete(table_name.to_s)
end

#collation ⇒ Object 



309
310
311
 
# File 'lib/arjdbc/mssql/adapter.rb', line 309

def collation
  select_value "SELECT SERVERPROPERTY('Collation')"
end

#columns(table_name, name = nil, default = EMPTY_ARRAY) ⇒ Object 



529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
 
# File 'lib/arjdbc/mssql/adapter.rb', line 529

def columns(table_name, name = nil, default = EMPTY_ARRAY)
  # It's possible for table_name to be an empty string, or nil, if something
  # attempts to issue SQL which doesn't involve a table.
  # IE. "SELECT 1" or "SELECT * FROM someFunction()".
  return default if table_name.blank?

  table_name = unquote_table_name(table_name)

  return default if table_name =~ SKIP_COLUMNS_TABLE_NAMES_RE

  unless columns = ( @table_columns ||= {} )[table_name]
    columns = super(table_name, name)
    for column in columns
      column.identity = true if column.sql_type =~ IDENTITY_COLUMN_TYPE_RE
      column.special = true if column.sql_type =~ SPECIAL_COLUMN_TYPE_RE
    end
    @table_columns[table_name] = columns
  end
  columns
end

#columns_for_distinct(columns, orders) ⇒ Object 



382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
 
# File 'lib/arjdbc/mssql/adapter.rb', line 382

def columns_for_distinct(columns, orders)
  return columns if orders.blank?

  # construct a clean list of column names from the ORDER BY clause,
  # removing any ASC/DESC modifiers
  order_columns = [ orders ]; order_columns.flatten! # AR 3.x vs 4.x
  order_columns.map! do |column|
    column = column.to_sql unless column.is_a?(String) # handle AREL node
    column.split(',').collect!{ |s| s.split.first }
  end.flatten!
  order_columns.reject!(&:blank?)
  order_columns = order_columns.zip(0...order_columns.size).to_a
  order_columns = order_columns.map{ |s, i| "#{s}" }

  columns = [ columns ]; columns.flatten!
  columns.push( *order_columns ).join(', ')
  # return a DISTINCT clause that's distinct on the columns we want but
  # includes all the required columns for the ORDER BY to work properly
end

#configure_connection ⇒ Object 



80
81
82
 
# File 'lib/arjdbc/mssql/adapter.rb', line 80

def configure_connection
  use_database # config[:database]
end

#create_database(name, options = {}) ⇒ Object 



345
346
347
 
# File 'lib/arjdbc/mssql/adapter.rb', line 345

def create_database(name, options = {})
  execute "CREATE DATABASE #{quote_database_name(name)}"
end

#current_database ⇒ Object 



313
314
315
 
# File 'lib/arjdbc/mssql/adapter.rb', line 313

def current_database
  select_value 'SELECT DB_NAME()'
end

#current_user ⇒ Object

SELECT CURRENT_USER



301
302
303
 
# File 'lib/arjdbc/mssql/adapter.rb', line 301

def current_user
  @current_user ||= @connection.execute_query_raw("SELECT CURRENT_USER").first['']
end

#database_exists?(name) ⇒ Boolean

Returns:

  • (Boolean) 


349
350
351
 
# File 'lib/arjdbc/mssql/adapter.rb', line 349

def database_exists?(name)
  select_value "SELECT name FROM sys.databases WHERE name = '#{name}'"
end

#default_schema ⇒ Object Also known as: current_schema

Returns the default schema (to be used for table resolution) used for the #current_user.



281
282
283
284
285
286
287
 
# File 'lib/arjdbc/mssql/adapter.rb', line 281

def default_schema
  return current_user if sqlserver_2000?
  @default_schema ||=
    @connection.execute_query_raw(
      "SELECT default_schema_name FROM sys.database_principals WHERE name = CURRENT_USER"
    ).first['default_schema_name']
end

#default_schema=(default_schema) ⇒ Object Also known as: current_schema=

Note:

This is not supported on SQL Server 2000 !

Allows for changing of the default schema (to be used during unqualified table name resolution).



293
294
295
296
297
 
# File 'lib/arjdbc/mssql/adapter.rb', line 293

def default_schema=(default_schema) # :nodoc:
  raise "changing DEFAULT_SCHEMA only supported on SQLServer 2005+" if sqlserver_2000?
  execute("ALTER #{current_user} WITH DEFAULT_SCHEMA=#{default_schema}")
  @default_schema = nil if defined?(@default_schema)
end

#distinct(columns, order_by) ⇒ Object

SELECT DISTINCT clause for a given set of columns and a given ORDER BY clause. MSSQL requires the ORDER BY columns in the select list for distinct queries.



378
379
380
 
# File 'lib/arjdbc/mssql/adapter.rb', line 378

def distinct(columns, order_by)
  "DISTINCT #{columns_for_distinct(columns, order_by)}"
end

#drop_database(name) ⇒ Object 



339
340
341
342
343
 
# File 'lib/arjdbc/mssql/adapter.rb', line 339

def drop_database(name)
  current_db = current_database
  use_database('master') if current_db.to_s == name
  execute "DROP DATABASE #{quote_database_name(name)}"
end

#exec_proc(proc_name, *variables) ⇒ Object Also known as: execute_procedure

Support for executing a stored procedure.



597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
 
# File 'lib/arjdbc/mssql/adapter.rb', line 597

def exec_proc(proc_name, *variables)
  vars =
    if variables.any? && variables.first.is_a?(Hash)
      variables.first.map { |k, v| "@#{k} = #{quote(v)}" }
    else
      variables.map { |v| quote(v) }
    end.join(', ')
  sql = "EXEC #{proc_name} #{vars}".strip
  log(sql, 'Execute Procedure') do
    result = @connection.execute_query_raw(sql)
    result.map! do |row|
      row = row.is_a?(Hash) ? row.with_indifferent_access : row
      yield(row) if block_given?
      row
    end
    result
  end
end

#exec_query(sql, name = 'SQL', binds = []) ⇒ Object 



618
619
620
621
622
623
624
625
626
627
628
629
630
631
 
# File 'lib/arjdbc/mssql/adapter.rb', line 618

def exec_query(sql, name = 'SQL', binds = [])
  # NOTE: we allow to execute SQL as requested returning a results.
  # e.g. this allows to use SQLServer's EXEC with a result set ...
  if sql.respond_to?(:to_sql)
    sql = to_sql(sql, binds); to_sql = true
  end
  sql = repair_special_columns(sql)
  if prepared_statements?
    log(sql, name, binds) { @connection.execute_query(sql, binds) }
  else
    sql = suble_binds(sql, binds) unless to_sql # deprecated behavior
    log(sql, name) { @connection.execute_query(sql) }
  end
end

#exec_query_raw(sql, name = 'SQL', binds = [], &block) ⇒ Object 



634
635
636
637
638
639
640
641
642
643
644
645
 
# File 'lib/arjdbc/mssql/adapter.rb', line 634

def exec_query_raw(sql, name = 'SQL', binds = [], &block)
  if sql.respond_to?(:to_sql)
    sql = to_sql(sql, binds); to_sql = true
  end
  sql = repair_special_columns(sql)
  if prepared_statements?
    log(sql, name, binds) { @connection.execute_query_raw(sql, binds, &block) }
  else
    sql = suble_binds(sql, binds) unless to_sql # deprecated behavior
    log(sql, name) { @connection.execute_query_raw(sql, &block) }
  end
end

#jdbc_column_class ⇒ Object

See Also:



64
 
# File 'lib/arjdbc/mssql/adapter.rb', line 64

def jdbc_column_class; ::ActiveRecord::ConnectionAdapters::MSSQLColumn end

#modify_types(types) ⇒ Object 



92
93
94
95
96
97
98
99
100
101
102
103
104
 
# File 'lib/arjdbc/mssql/adapter.rb', line 92

def modify_types(types)
  types[:string] = { :name => "NVARCHAR", :limit => 255 }
  if sqlserver_2000?
    types[:text] = { :name => "NTEXT" }
  else
    types[:text] = { :name => "NVARCHAR(MAX)" }
  end
  types[:primary_key] = "int NOT NULL IDENTITY(1, 1) PRIMARY KEY"
  types[:integer][:limit] = nil
  types[:boolean] = { :name => "bit" }
  types[:binary] = { :name => "image" }
  types
end

#quote(value, column = nil) ⇒ Object 



142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
 
# File 'lib/arjdbc/mssql/adapter.rb', line 142

def quote(value, column = nil)
  return value.quoted_id if value.respond_to?(:quoted_id)
  return value if sql_literal?(value)

  case value
  # SQL Server 2000 doesn't let you insert an integer into a NVARCHAR
  when String, ActiveSupport::Multibyte::Chars, Integer
    value = value.to_s
    column_type = column && column.type
    if column_type == :binary
      if update_lob_value?(value, column)
        BLOB_VALUE_MARKER
      else
        "'#{quote_string(column.class.string_to_binary(value))}'" # ' (for ruby-mode)
      end
    elsif column_type == :integer
      value.to_i.to_s
    elsif column_type == :float
      value.to_f.to_s
    elsif ! column.respond_to?(:is_utf8?) || column.is_utf8?
      "N'#{quote_string(value)}'" # ' (for ruby-mode)
    else
      super
    end
  when Date, Time
    if column && column.type == :time
      "'#{quoted_time(value)}'"
    else
      "'#{quoted_date(value)}'"
    end
  when TrueClass  then '1'
  when FalseClass then '0'
  else super
  end
end

#quote_column_name(name) ⇒ Object 



220
221
222
223
224
 
# File 'lib/arjdbc/mssql/adapter.rb', line 220

def quote_column_name(name)
  name = name.to_s.split('.')
  name.map! { |n| quote_name_part(n) } # "[#{name}]"
  name.join('.')
end

#quote_database_name(name) ⇒ Object 



226
227
228
 
# File 'lib/arjdbc/mssql/adapter.rb', line 226

def quote_database_name(name)
  quote_name_part(name.to_s)
end

#quote_default_value(value, column) ⇒ Object

Does not quote function default values for UUID columns



231
232
233
234
235
236
237
 
# File 'lib/arjdbc/mssql/adapter.rb', line 231

def quote_default_value(value, column)
  if column.type == :uuid && value =~ /\(\)/
    value
  else
    quote(value)
  end
end

#quote_table_name(name) ⇒ Object 



216
217
218
 
# File 'lib/arjdbc/mssql/adapter.rb', line 216

def quote_table_name(name)
  quote_column_name(name)
end

#quoted_date(value) ⇒ Object 



179
180
181
182
183
184
185
 
# File 'lib/arjdbc/mssql/adapter.rb', line 179

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

#release_savepoint(name = current_savepoint_name) ⇒ Object 



648
649
650
651
652
653
654
 
# File 'lib/arjdbc/mssql/adapter.rb', line 648

def release_savepoint(name = current_savepoint_name)
  if @connection.jtds_driver?
    @connection.release_savepoint(name)
  else # MS invented it's "own" way
    @connection.rollback_savepoint(name)
  end
end

#remove_check_constraints(table_name, column_name) ⇒ Object 



495
496
497
498
499
500
501
502
503
 
# File 'lib/arjdbc/mssql/adapter.rb', line 495

def remove_check_constraints(table_name, column_name)
  clear_cached_table(table_name)
  constraints = select_values "SELECT constraint_name" <<
    " FROM information_schema.constraint_column_usage" <<
    " WHERE table_name = '#{table_name}' AND column_name = '#{column_name}'"
  constraints.each do |constraint_name|
    execute "ALTER TABLE #{table_name} DROP CONSTRAINT #{constraint_name}"
  end
end

#remove_column(table_name, *column_names) ⇒ Object 



465
466
467
 
# File 'lib/arjdbc/mssql/adapter.rb', line 465

def remove_column(table_name, column_name, type = nil, options = {})
  remove_columns(table_name, column_name)
end

#remove_columns(table_name, *column_names) ⇒ Object

Raises:

  • (ArgumentError) 


444
445
446
447
448
449
450
451
452
 
# File 'lib/arjdbc/mssql/adapter.rb', line 444

def remove_columns(table_name, *column_names)
  raise ArgumentError.new("You must specify at least one column name. Example: remove_column(:people, :first_name)") if column_names.empty?
  # remove_columns(:posts, :foo, :bar) old syntax : remove_columns(:posts, [:foo, :bar])
  clear_cached_table(table_name)

  column_names = column_names.flatten
  return do_remove_column(table_name, column_names.first) if column_names.size == 1
  column_names.each { |column_name| do_remove_column(table_name, column_name) }
end

#remove_default_constraint(table_name, column_name) ⇒ Object 



475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
 
# File 'lib/arjdbc/mssql/adapter.rb', line 475

def remove_default_constraint(table_name, column_name)
  clear_cached_table(table_name)
  if sqlserver_2000?
    # NOTE: since SQLServer 2005 these are provided as sys.sysobjects etc.
    # but only due backwards-compatibility views and should be avoided ...
    defaults = select_values "SELECT d.name" <<
      " FROM sysobjects d, syscolumns c, sysobjects t" <<
      " WHERE c.cdefault = d.id AND c.name = '#{column_name}'" <<
      " AND t.name = '#{table_name}' AND c.id = t.id"
  else
    defaults = select_values "SELECT d.name FROM sys.tables t" <<
      " JOIN sys.default_constraints d ON d.parent_object_id = t.object_id" <<
      " JOIN sys.columns c ON c.object_id = t.object_id AND c.column_id = d.parent_column_id" <<
      " WHERE t.name = '#{table_name}' AND c.name = '#{column_name}'"
  end
  defaults.each do |def_name|
    execute "ALTER TABLE #{table_name} DROP CONSTRAINT #{def_name}"
  end
end

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



512
513
514
 
# File 'lib/arjdbc/mssql/adapter.rb', line 512

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

#remove_indexes(table_name, column_name) ⇒ Object 



505
506
507
508
509
510
 
# File 'lib/arjdbc/mssql/adapter.rb', line 505

def remove_indexes(table_name, column_name)
  indexes = self.indexes(table_name)
  indexes.select{ |index| index.columns.include?(column_name.to_s) }.each do |index|
    remove_index(table_name, { :name => index.name })
  end
end

#rename_column(table_name, column_name, new_column_name) ⇒ Object 



371
372
373
374
 
# File 'lib/arjdbc/mssql/adapter.rb', line 371

def rename_column(table_name, column_name, new_column_name)
  clear_cached_table(table_name)
  execute "EXEC sp_rename '#{table_name}.#{column_name}', '#{new_column_name}', 'COLUMN'"
end

#rename_table(table_name, new_table_name) ⇒ Object 



354
355
356
357
 
# File 'lib/arjdbc/mssql/adapter.rb', line 354

def rename_table(table_name, new_table_name)
  clear_cached_table(table_name)
  execute "EXEC sp_rename '#{table_name}', '#{new_table_name}'"
end

#reset_column_information ⇒ Object 



554
555
556
 
# File 'lib/arjdbc/mssql/adapter.rb', line 554

def reset_column_information
  @table_columns = nil if defined? @table_columns
end

#set_identity_insert(table_name, enable = true) ⇒ Object 



568
569
570
571
572
573
 
# File 'lib/arjdbc/mssql/adapter.rb', line 568

def set_identity_insert(table_name, enable = true)
  execute "SET IDENTITY_INSERT #{table_name} #{enable ? 'ON' : 'OFF'}"
rescue Exception => e
  raise ActiveRecord::ActiveRecordError, "IDENTITY_INSERT could not be turned" +
        " #{enable ? 'ON' : 'OFF'} for table #{table_name} due : #{e.inspect}"
end

#sqlserver_version ⇒ Object 



84
85
86
87
88
89
90
 
# File 'lib/arjdbc/mssql/adapter.rb', line 84

def sqlserver_version
  @sqlserver_version ||= begin
    config_version = config[:sqlserver_version]
    config_version ? config_version.to_s :
      select_value("SELECT @@version")[/(Microsoft SQL Server\s+|Microsoft SQL Azure.+\n.+)(\d{4})/, 2]
  end
end

#supports_ddl_transactions? ⇒ Boolean

Returns:

  • (Boolean) 


257
 
# File 'lib/arjdbc/mssql/adapter.rb', line 257

def supports_ddl_transactions?; true end

#supports_views? ⇒ Boolean

Returns:

  • (Boolean) 


260
 
# File 'lib/arjdbc/mssql/adapter.rb', line 260

def supports_views?; true end

#tables(schema = current_schema) ⇒ Object 



262
263
264
 
# File 'lib/arjdbc/mssql/adapter.rb', line 262

def tables(schema = current_schema)
  @connection.tables(nil, schema)
end

#truncate(table_name, name = nil) ⇒ Object 



592
593
594
 
# File 'lib/arjdbc/mssql/adapter.rb', line 592

def truncate(table_name, name = nil)
  execute "TRUNCATE TABLE #{quote_table_name(table_name)}", name
end

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



109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
 
# File 'lib/arjdbc/mssql/adapter.rb', line 109

def type_to_sql(type, limit = nil, precision = nil, scale = nil)
  type_s = type.to_s
  # MSSQL's NVARCHAR(n | max) column supports either a number between 1 and
  # 4000, or the word "MAX", which corresponds to 2**30-1 UCS-2 characters.
  #
  # It does not accept NVARCHAR(1073741823) here, so we have to change it
  # to NVARCHAR(MAX), even though they are logically equivalent.
  #
  # MSSQL Server 2000 is skipped here because I don't know how it will behave.
  #
  # See: http://msdn.microsoft.com/en-us/library/ms186939.aspx
  if type_s == 'string' && limit == 1073741823 && ! sqlserver_2000?
    'NVARCHAR(MAX)'
  elsif NO_LIMIT_TYPES.include?(type_s)
    super(type)
  elsif type_s == 'integer' || type_s == 'int'
    if limit.nil? || limit == 4
      'int'
    elsif limit == 2
      'smallint'
    elsif limit == 1
      'tinyint'
    else
      'bigint'
    end
  elsif type_s == 'uniqueidentifier'
    type_s
  else
    super
  end
end

#update_lob_value?(value, column = nil) ⇒ Boolean

Returns:

  • (Boolean)

See Also:



54
55
56
 
# File 'lib/arjdbc/mssql/adapter.rb', line 54

def update_lob_value?(value, column = nil)
  MSSQL.update_lob_values? && ! prepared_statements? # && value
end

#use_database(database = nil) ⇒ Object 



317
318
319
320
 
# File 'lib/arjdbc/mssql/adapter.rb', line 317

def use_database(database = nil)
  database ||= config[:database]
  execute "USE #{quote_database_name(database)}" unless database.blank?
end

#with_identity_insert_enabled(table_name) ⇒ Object

Turns IDENTITY_INSERT ON for table during execution of the block N.B. This sets the state of IDENTITY_INSERT to OFF after the block has been executed without regard to its previous state



561
562
563
564
565
566
 
# File 'lib/arjdbc/mssql/adapter.rb', line 561

def with_identity_insert_enabled(table_name)
  set_identity_insert(table_name, true)
  yield
ensure
  set_identity_insert(table_name, false)
end