Module | Sequel::MSSQL::DatasetMethods |
In: |
lib/sequel/adapters/shared/mssql.rb
|
BOOL_TRUE | = | '1'.freeze |
BOOL_FALSE | = | '0'.freeze |
COMMA_SEPARATOR | = | ', '.freeze |
DELETE_CLAUSE_METHODS | = | Dataset.clause_methods(:delete, %w'with delete from output from2 where') |
INSERT_CLAUSE_METHODS | = | Dataset.clause_methods(:insert, %w'with insert into columns output values') |
SELECT_CLAUSE_METHODS | = | Dataset.clause_methods(:select, %w'with select distinct limit columns into from lock join where group having order compounds') |
UPDATE_CLAUSE_METHODS | = | Dataset.clause_methods(:update, %w'with update limit table set output from where') |
NOLOCK | = | ' WITH (NOLOCK)'.freeze |
UPDLOCK | = | ' WITH (UPDLOCK)'.freeze |
WILDCARD | = | LiteralString.new('*').freeze |
CONSTANT_MAP | = | {:CURRENT_DATE=>'CAST(CURRENT_TIMESTAMP AS DATE)'.freeze, :CURRENT_TIME=>'CAST(CURRENT_TIMESTAMP AS TIME)'.freeze} |
EXTRACT_MAP | = | {:year=>"yy", :month=>"m", :day=>"d", :hour=>"hh", :minute=>"n", :second=>"s"} |
BRACKET_CLOSE | = | Dataset::BRACKET_CLOSE |
BRACKET_OPEN | = | Dataset::BRACKET_OPEN |
COMMA | = | Dataset::COMMA |
PAREN_CLOSE | = | Dataset::PAREN_CLOSE |
PAREN_SPACE_OPEN | = | Dataset::PAREN_SPACE_OPEN |
SPACE | = | Dataset::SPACE |
FROM | = | Dataset::FROM |
APOS | = | Dataset::APOS |
APOS_RE | = | Dataset::APOS_RE |
DOUBLE_APOS | = | Dataset::DOUBLE_APOS |
INTO | = | Dataset::INTO |
DATEPART_SECOND_OPEN | = | "CAST((datepart(".freeze |
DATEPART_SECOND_MIDDLE | = | ') + datepart(ns, '.freeze |
DATEPART_SECOND_CLOSE | = | ")/1000000000.0) AS double precision)".freeze |
DATEPART_OPEN | = | "datepart(".freeze |
UNION_ALL | = | ' UNION ALL '.freeze |
SELECT_SPACE | = | 'SELECT '.freeze |
TIMESTAMP_USEC_FORMAT | = | ".%03d".freeze |
OUTPUT_INSERTED | = | " OUTPUT INSERTED.*".freeze |
HEX_START | = | '0x'.freeze |
UNICODE_STRING_START | = | "N'".freeze |
BACKSLASH_CRLF_RE | = | /\\((?:\r\n)|\n)/.freeze |
BACKSLASH_CRLF_REPLACE | = | '\\\\\\\\\\1\\1'.freeze |
TOP_PAREN | = | " TOP (".freeze |
TOP | = | " TOP ".freeze |
OUTPUT | = | " OUTPUT ".freeze |
HSTAR | = | "H*".freeze |
CASE_SENSITIVE_COLLATION | = | 'Latin1_General_CS_AS'.freeze |
CASE_INSENSITIVE_COLLATION | = | 'Latin1_General_CI_AS'.freeze |
DEFAULT_TIMESTAMP_FORMAT | = | "'%Y-%m-%dT%H:%M:%S%N%z'".freeze |
FORMAT_DATE | = | "'%Y%m%d'".freeze |
mssql_unicode_strings | [RW] | Allow overriding of the mssql_unicode_strings option at the dataset level. |
Copy the mssql_unicode_strings option from the db object.
# File lib/sequel/adapters/shared/mssql.rb, line 371 371: def initialize(db, opts={}) 372: super 373: @mssql_unicode_strings = db.mssql_unicode_strings 374: end
MSSQL uses + for string concatenation, and LIKE is case insensitive by default.
# File lib/sequel/adapters/shared/mssql.rb, line 377 377: def complex_expression_sql_append(sql, op, args) 378: case op 379: when '||''||' 380: super(sql, :+, args) 381: when :LIKE, "NOT LIKE""NOT LIKE" 382: super(sql, op, args.map{|a| LiteralString.new("(#{literal(a)} COLLATE #{CASE_SENSITIVE_COLLATION})")}) 383: when :ILIKE, "NOT ILIKE""NOT ILIKE" 384: super(sql, (op == :ILIKE ? :LIKE : "NOT LIKE""NOT LIKE"), args.map{|a| LiteralString.new("(#{literal(a)} COLLATE #{CASE_INSENSITIVE_COLLATION})")}) 385: when :<< 386: sql << complex_expression_arg_pairs(args){|a, b| "(#{literal(a)} * POWER(2, #{literal(b)}))"} 387: when :>> 388: sql << complex_expression_arg_pairs(args){|a, b| "(#{literal(a)} / POWER(2, #{literal(b)}))"} 389: when :extract 390: part = args.at(0) 391: raise(Sequel::Error, "unsupported extract argument: #{part.inspect}") unless format = EXTRACT_MAP[part] 392: if part == :second 393: expr = literal(args.at(1)) 394: sql << DATEPART_SECOND_OPEN << format.to_s << COMMA << expr << DATEPART_SECOND_MIDDLE << expr << DATEPART_SECOND_CLOSE 395: else 396: sql << DATEPART_OPEN << format.to_s << COMMA 397: literal_append(sql, args.at(1)) 398: sql << PAREN_CLOSE 399: end 400: else 401: super 402: end 403: end
Disable the use of INSERT OUTPUT
# File lib/sequel/adapters/shared/mssql.rb, line 415 415: def disable_insert_output 416: clone(:disable_insert_output=>true) 417: end
Disable the use of INSERT OUTPUT, modifying the receiver
# File lib/sequel/adapters/shared/mssql.rb, line 420 420: def disable_insert_output! 421: mutation_method(:disable_insert_output) 422: end
Use the OUTPUT clause to get the value of all columns for the newly inserted record.
# File lib/sequel/adapters/shared/mssql.rb, line 431 431: def insert_select(*values) 432: return unless supports_insert_select? 433: naked.clone(default_server_opts(:sql=>output(nil, [SQL::ColumnAll.new(:inserted)]).insert_sql(*values))).single_record 434: end
Specify a table for a SELECT … INTO query.
# File lib/sequel/adapters/shared/mssql.rb, line 437 437: def into(table) 438: clone(:into => table) 439: end
MSSQL uses a UNION ALL statement to insert multiple values at once.
# File lib/sequel/adapters/shared/mssql.rb, line 442 442: def multi_insert_sql(columns, values) 443: c = false 444: sql = LiteralString.new('') 445: u = UNION_ALL 446: values.each do |v| 447: sql << u if c 448: sql << SELECT_SPACE 449: expression_list_append(sql, v) 450: c ||= true 451: end 452: [insert_sql(columns, sql)] 453: end
Allows you to do a dirty read of uncommitted data using WITH (NOLOCK).
# File lib/sequel/adapters/shared/mssql.rb, line 456 456: def nolock 457: lock_style(:dirty) 458: end
Include an OUTPUT clause in the eventual INSERT, UPDATE, or DELETE query.
The first argument is the table to output into, and the second argument is either an Array of column values to select, or a Hash which maps output column names to selected values, in the style of insert or update.
Output into a returned result set is not currently supported.
Examples:
dataset.output(:output_table, [:deleted__id, :deleted__name]) dataset.output(:output_table, :id => :inserted__id, :name => :inserted__name)
# File lib/sequel/adapters/shared/mssql.rb, line 472 472: def output(into, values) 473: raise(Error, "SQL Server versions 2000 and earlier do not support the OUTPUT clause") unless supports_output_clause? 474: output = {} 475: case values 476: when Hash 477: output[:column_list], output[:select_list] = values.keys, values.values 478: when Array 479: output[:select_list] = values 480: end 481: output[:into] = into 482: clone({:output => output}) 483: end
The version of the database server.
# File lib/sequel/adapters/shared/mssql.rb, line 497 497: def server_version 498: db.server_version(@opts[:server]) 499: end
MSSQL supports insert_select via the OUTPUT clause.
# File lib/sequel/adapters/shared/mssql.rb, line 512 512: def supports_insert_select? 513: supports_output_clause? && !opts[:disable_insert_output] 514: end
If returned primary keys are requested, use OUTPUT unless already set on the dataset. If OUTPUT is already set, use existing returning values. If OUTPUT is only set to return a single columns, return an array of just that column. Otherwise, return an array of hashes.
# File lib/sequel/adapters/shared/mssql.rb, line 562 562: def _import(columns, values, opts={}) 563: if opts[:return] == :primary_key && !@opts[:output] 564: output(nil, [SQL::QualifiedIdentifier.new(:inserted, first_primary_key)])._import(columns, values, opts) 565: elsif @opts[:output] 566: statements = multi_insert_sql(columns, values) 567: @db.transaction(opts.merge(:server=>@opts[:server])) do 568: statements.map{|st| with_sql(st)} 569: end.first.map{|v| v.length == 1 ? v.values.first : v} 570: else 571: super 572: end 573: end