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') |
UPDATE_CLAUSE_METHODS_2000 | = | Dataset.clause_methods(:update, %w'update 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 |
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 |
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 |
CROSS_APPLY | = | 'CROSS APPLY'.freeze |
OUTER_APPLY | = | 'OUTER APPLY'.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 459 459: def complex_expression_sql_append(sql, op, args) 460: case op 461: when '||''||' 462: super(sql, :+, args) 463: when :LIKE, "NOT LIKE""NOT LIKE" 464: super(sql, op, args.map{|a| LiteralString.new("(#{literal(a)} COLLATE #{CASE_SENSITIVE_COLLATION})")}) 465: when :ILIKE, "NOT ILIKE""NOT ILIKE" 466: super(sql, (op == :ILIKE ? :LIKE : "NOT LIKE""NOT LIKE"), args.map{|a| LiteralString.new("(#{literal(a)} COLLATE #{CASE_INSENSITIVE_COLLATION})")}) 467: when :<< 468: sql << complex_expression_arg_pairs(args){|a, b| "(#{literal(a)} * POWER(2, #{literal(b)}))"} 469: when :>> 470: sql << complex_expression_arg_pairs(args){|a, b| "(#{literal(a)} / POWER(2, #{literal(b)}))"} 471: when :extract 472: part = args.at(0) 473: raise(Sequel::Error, "unsupported extract argument: #{part.inspect}") unless format = EXTRACT_MAP[part] 474: if part == :second 475: expr = literal(args.at(1)) 476: sql << DATEPART_SECOND_OPEN << format.to_s << COMMA << expr << DATEPART_SECOND_MIDDLE << expr << DATEPART_SECOND_CLOSE 477: else 478: sql << DATEPART_OPEN << format.to_s << COMMA 479: literal_append(sql, args.at(1)) 480: sql << PAREN_CLOSE 481: end 482: else 483: super 484: end 485: end
Disable the use of INSERT OUTPUT
# File lib/sequel/adapters/shared/mssql.rb, line 502 502: def disable_insert_output 503: clone(:disable_insert_output=>true) 504: end
There is no function on Microsoft SQL Server that does character length and respects trailing spaces (datalength respects trailing spaces, but counts bytes instead of characters). Use a hack to work around the trailing spaces issue.
# File lib/sequel/adapters/shared/mssql.rb, line 515 515: def emulated_function_sql_append(sql, f) 516: case f.f 517: when :char_length 518: literal_append(sql, SQL::Function.new(:len, Sequel.join([f.args.first, 'x'])) - 1) 519: when :trim 520: literal_append(sql, SQL::Function.new(:ltrim, SQL::Function.new(:rtrim, f.args.first))) 521: else 522: super 523: end 524: 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 533 533: def insert_select(*values) 534: return unless supports_insert_select? 535: naked.clone(default_server_opts(:sql=>output(nil, [SQL::ColumnAll.new(:inserted)]).insert_sql(*values))).single_record 536: end
Specify a table for a SELECT … INTO query.
# File lib/sequel/adapters/shared/mssql.rb, line 539 539: def into(table) 540: clone(:into => table) 541: end
Use the database‘s mssql_unicode_strings setting if the dataset hasn‘t overridden it.
# File lib/sequel/adapters/shared/mssql.rb, line 454 454: def mssql_unicode_strings 455: defined?(@mssql_unicode_strings) ? @mssql_unicode_strings : (@mssql_unicode_strings = db.mssql_unicode_strings) 456: end
MSSQL uses a UNION ALL statement to insert multiple values at once.
# File lib/sequel/adapters/shared/mssql.rb, line 544 544: def multi_insert_sql(columns, values) 545: c = false 546: sql = LiteralString.new('') 547: u = UNION_ALL 548: values.each do |v| 549: sql << u if c 550: sql << SELECT_SPACE 551: expression_list_append(sql, v) 552: c ||= true 553: end 554: [insert_sql(columns, sql)] 555: end
Allows you to do a dirty read of uncommitted data using WITH (NOLOCK).
# File lib/sequel/adapters/shared/mssql.rb, line 558 558: def nolock 559: lock_style(:dirty) 560: 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 579 579: def output(into, values) 580: raise(Error, "SQL Server versions 2000 and earlier do not support the OUTPUT clause") unless supports_output_clause? 581: output = {} 582: case values 583: when Hash 584: output[:column_list], output[:select_list] = values.keys, values.values 585: when Array 586: output[:select_list] = values 587: end 588: output[:into] = into 589: clone({:output => output}) 590: end
The version of the database server.
# File lib/sequel/adapters/shared/mssql.rb, line 598 598: def server_version 599: db.server_version(@opts[:server]) 600: end
MSSQL supports insert_select via the OUTPUT clause.
# File lib/sequel/adapters/shared/mssql.rb, line 613 613: def supports_insert_select? 614: supports_output_clause? && !opts[:disable_insert_output] 615: 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 663 663: def _import(columns, values, opts=OPTS) 664: if opts[:return] == :primary_key && !@opts[:output] 665: output(nil, [SQL::QualifiedIdentifier.new(:inserted, first_primary_key)])._import(columns, values, opts) 666: elsif @opts[:output] 667: statements = multi_insert_sql(columns, values) 668: @db.transaction(opts.merge(:server=>@opts[:server])) do 669: statements.map{|st| with_sql(st)} 670: end.first.map{|v| v.length == 1 ? v.values.first : v} 671: else 672: super 673: end 674: end