Module | Sequel::MSSQL |
In: |
lib/sequel/adapters/shared/mssql.rb
lib/sequel/extensions/mssql_emulate_lateral_with_apply.rb |
BOOL_TRUE | = | '1'.freeze |
BOOL_FALSE | = | '0'.freeze |
COMMA_SEPARATOR | = | ', '.freeze |
TABLE_HINT | = | " WITH (".freeze |
READPAST | = | "READPAST".freeze |
NOLOCK | = | 'NOLOCK'.freeze |
UPDLOCK | = | '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. |
# File lib/sequel/adapters/shared/mssql.rb, line 10 10: def self.mock_adapter_setup(db) 11: db.instance_eval do 12: @server_version = 11000000 13: end 14: end
MSSQL uses + for string concatenation, and LIKE is case insensitive by default.
# File lib/sequel/adapters/shared/mssql.rb, line 585 585: def complex_expression_sql_append(sql, op, args) 586: case op 587: when '||''||' 588: super(sql, :+, args) 589: when :LIKE, "NOT LIKE""NOT LIKE" 590: super(sql, op, args.map{|a| Sequel.lit(["(", " COLLATE #{CASE_SENSITIVE_COLLATION})"], a)}) 591: when :ILIKE, "NOT ILIKE""NOT ILIKE" 592: super(sql, (op == :ILIKE ? :LIKE : "NOT LIKE""NOT LIKE"), args.map{|a| Sequel.lit(["(", " COLLATE #{CASE_INSENSITIVE_COLLATION})"], a)}) 593: when :<<, :>> 594: complex_expression_emulate_append(sql, op, args) 595: when :extract 596: part = args.at(0) 597: raise(Sequel::Error, "unsupported extract argument: #{part.inspect}") unless format = EXTRACT_MAP[part] 598: if part == :second 599: expr = args.at(1) 600: sql << DATEPART_SECOND_OPEN << format.to_s << COMMA 601: literal_append(sql, expr) 602: sql << DATEPART_SECOND_MIDDLE 603: literal_append(sql, expr) 604: sql << DATEPART_SECOND_CLOSE 605: else 606: sql << DATEPART_OPEN << format.to_s << COMMA 607: literal_append(sql, args.at(1)) 608: sql << PAREN_CLOSE 609: end 610: else 611: super 612: end 613: end
Disable the use of INSERT OUTPUT
# File lib/sequel/adapters/shared/mssql.rb, line 630 630: def disable_insert_output 631: clone(:disable_insert_output=>true) 632: 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 646 646: def insert_select(*values) 647: return unless supports_insert_select? 648: with_sql_first(insert_select_sql(*values)) 649: 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 653 653: def insert_select_sql(*values) 654: ds = (opts[:output] || opts[:returning]) ? self : output(nil, [SQL::ColumnAll.new(:inserted)]) 655: ds.insert_sql(*values) 656: end
Specify a table for a SELECT … INTO query.
# File lib/sequel/adapters/shared/mssql.rb, line 659 659: def into(table) 660: clone(:into => table) 661: end
Use the database‘s mssql_unicode_strings setting if the dataset hasn‘t overridden it.
# File lib/sequel/adapters/shared/mssql.rb, line 580 580: def mssql_unicode_strings 581: defined?(@mssql_unicode_strings) ? @mssql_unicode_strings : (@mssql_unicode_strings = db.mssql_unicode_strings) 582: end
Allows you to do a dirty read of uncommitted data using WITH (NOLOCK).
# File lib/sequel/adapters/shared/mssql.rb, line 664 664: def nolock 665: lock_style(:dirty) 666: 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 685 685: def output(into, values) 686: raise(Error, "SQL Server versions 2000 and earlier do not support the OUTPUT clause") unless supports_output_clause? 687: output = {} 688: case values 689: when Hash 690: output[:column_list], output[:select_list] = values.keys, values.values 691: when Array 692: output[:select_list] = values 693: end 694: output[:into] = into 695: clone(:output => output) 696: end
Emulate RETURNING using the output clause. This only handles values that are simple column references.
# File lib/sequel/adapters/shared/mssql.rb, line 704 704: def returning(*values) 705: values = values.map do |v| 706: unless r = unqualified_column_for(v) 707: raise(Error, "cannot emulate RETURNING via OUTPUT for value: #{v.inspect}") 708: end 709: r 710: end 711: clone(:returning=>values) 712: 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 718 718: def select_sql 719: if @opts[:offset] && !@opts[:order] && is_2012_or_later? 720: order(1).select_sql 721: else 722: super 723: end 724: end
The version of the database server.
# File lib/sequel/adapters/shared/mssql.rb, line 727 727: def server_version 728: db.server_version(@opts[:server]) 729: end
# File lib/sequel/adapters/shared/mssql.rb, line 731 731: def supports_cte?(type=:select) 732: is_2005_or_later? 733: end
MSSQL supports insert_select via the OUTPUT clause.
# File lib/sequel/adapters/shared/mssql.rb, line 751 751: def supports_insert_select? 752: supports_output_clause? && !opts[:disable_insert_output] 753: 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 816 816: def _import(columns, values, opts=OPTS) 817: if opts[:return] == :primary_key && !@opts[:output] 818: output(nil, [SQL::QualifiedIdentifier.new(:inserted, first_primary_key)])._import(columns, values, opts) 819: elsif @opts[:output] 820: statements = multi_insert_sql(columns, values) 821: @db.transaction(opts.merge(:server=>@opts[:server])) do 822: statements.map{|st| with_sql(st)} 823: end.first.map{|v| v.length == 1 ? v.values.first : v} 824: else 825: super 826: end 827: end