Module | Sequel::MSSQL |
In: |
lib/sequel/extensions/mssql_emulate_lateral_with_apply.rb
lib/sequel/adapters/shared/mssql.rb |
BOOL_TRUE | = | '1'.freeze |
BOOL_FALSE | = | '0'.freeze |
COMMA_SEPARATOR | = | ', '.freeze |
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 |
DOUBLE_BRACKET_CLOSE | = | ']]'.freeze |
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 |
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 |
CROSS_APPLY | = | 'CROSS APPLY'.freeze |
OUTER_APPLY | = | 'OUTER APPLY'.freeze |
OFFSET | = | " OFFSET ".freeze |
ROWS | = | " ROWS".freeze |
ROWS_ONLY | = | " ROWS ONLY".freeze |
FETCH_NEXT | = | " FETCH NEXT ".freeze |
mssql_unicode_strings | [W] | Allow overriding of the mssql_unicode_strings option at the dataset level. |
MSSQL uses + for string concatenation, and LIKE is case insensitive by default.
# File lib/sequel/adapters/shared/mssql.rb, line 572 572: def complex_expression_sql_append(sql, op, args) 573: case op 574: when '||''||' 575: super(sql, :+, args) 576: when :LIKE, "NOT LIKE""NOT LIKE" 577: super(sql, op, args.map{|a| Sequel.lit(["(", " COLLATE #{CASE_SENSITIVE_COLLATION})"], a)}) 578: when :ILIKE, "NOT ILIKE""NOT ILIKE" 579: super(sql, (op == :ILIKE ? :LIKE : "NOT LIKE""NOT LIKE"), args.map{|a| Sequel.lit(["(", " COLLATE #{CASE_INSENSITIVE_COLLATION})"], a)}) 580: when :<<, :>> 581: complex_expression_emulate_append(sql, op, args) 582: when :extract 583: part = args.at(0) 584: raise(Sequel::Error, "unsupported extract argument: #{part.inspect}") unless format = EXTRACT_MAP[part] 585: if part == :second 586: expr = args.at(1) 587: sql << DATEPART_SECOND_OPEN << format.to_s << COMMA 588: literal_append(sql, expr) 589: sql << DATEPART_SECOND_MIDDLE 590: literal_append(sql, expr) 591: sql << DATEPART_SECOND_CLOSE 592: else 593: sql << DATEPART_OPEN << format.to_s << COMMA 594: literal_append(sql, args.at(1)) 595: sql << PAREN_CLOSE 596: end 597: else 598: super 599: end 600: end
Disable the use of INSERT OUTPUT
# File lib/sequel/adapters/shared/mssql.rb, line 617 617: def disable_insert_output 618: clone(:disable_insert_output=>true) 619: 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 633 633: def insert_select(*values) 634: return unless supports_insert_select? 635: with_sql_first(insert_select_sql(*values)) 636: end
Add OUTPUT clause unless there is already an existing output clause, then return the SQL to insert.
# File lib/sequel/adapters/shared/mssql.rb, line 640 640: def insert_select_sql(*values) 641: ds = (opts[:output] || opts[:returning]) ? self : output(nil, [SQL::ColumnAll.new(:inserted)]) 642: ds.insert_sql(*values) 643: end
Specify a table for a SELECT … INTO query.
# File lib/sequel/adapters/shared/mssql.rb, line 646 646: def into(table) 647: clone(:into => table) 648: end
Use the database‘s mssql_unicode_strings setting if the dataset hasn‘t overridden it.
# File lib/sequel/adapters/shared/mssql.rb, line 567 567: def mssql_unicode_strings 568: defined?(@mssql_unicode_strings) ? @mssql_unicode_strings : (@mssql_unicode_strings = db.mssql_unicode_strings) 569: end
Allows you to do a dirty read of uncommitted data using WITH (NOLOCK).
# File lib/sequel/adapters/shared/mssql.rb, line 651 651: def nolock 652: lock_style(:dirty) 653: 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 672 672: def output(into, values) 673: raise(Error, "SQL Server versions 2000 and earlier do not support the OUTPUT clause") unless supports_output_clause? 674: output = {} 675: case values 676: when Hash 677: output[:column_list], output[:select_list] = values.keys, values.values 678: when Array 679: output[:select_list] = values 680: end 681: output[:into] = into 682: clone(:output => output) 683: end
Emulate RETURNING using the output clause. This only handles values that are simple column references.
# File lib/sequel/adapters/shared/mssql.rb, line 691 691: def returning(*values) 692: values = values.map do |v| 693: unless r = unqualified_column_for(v) 694: raise(Error, "cannot emulate RETURNING via OUTPUT for value: #{v.inspect}") 695: end 696: r 697: end 698: clone(:returning=>values) 699: end
On MSSQL 2012+ add a default order to the current dataset if an offset is used. The default offset emulation using a subquery would be used in the unordered case by default, and that also adds a default order, so it‘s better to just avoid the subquery.
# File lib/sequel/adapters/shared/mssql.rb, line 705 705: def select_sql 706: if @opts[:offset] && !@opts[:order] && is_2012_or_later? 707: order(1).select_sql 708: else 709: super 710: end 711: end
The version of the database server.
# File lib/sequel/adapters/shared/mssql.rb, line 714 714: def server_version 715: db.server_version(@opts[:server]) 716: end
# File lib/sequel/adapters/shared/mssql.rb, line 718 718: def supports_cte?(type=:select) 719: is_2005_or_later? 720: end
MSSQL supports insert_select via the OUTPUT clause.
# File lib/sequel/adapters/shared/mssql.rb, line 733 733: def supports_insert_select? 734: supports_output_clause? && !opts[:disable_insert_output] 735: 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 793 793: def _import(columns, values, opts=OPTS) 794: if opts[:return] == :primary_key && !@opts[:output] 795: output(nil, [SQL::QualifiedIdentifier.new(:inserted, first_primary_key)])._import(columns, values, opts) 796: elsif @opts[:output] 797: statements = multi_insert_sql(columns, values) 798: @db.transaction(opts.merge(:server=>@opts[:server])) do 799: statements.map{|st| with_sql(st)} 800: end.first.map{|v| v.length == 1 ? v.values.first : v} 801: else 802: super 803: end 804: end