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 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 361 361: def initialize(db, opts={}) 362: super 363: @mssql_unicode_strings = db.mssql_unicode_strings 364: end
MSSQL uses + for string concatenation, and LIKE is case insensitive by default.
# File lib/sequel/adapters/shared/mssql.rb, line 367 367: def complex_expression_sql_append(sql, op, args) 368: case op 369: when '||''||' 370: super(sql, :+, args) 371: when :LIKE, "NOT LIKE""NOT LIKE" 372: super(sql, op, args.map{|a| LiteralString.new("(#{literal(a)} COLLATE #{CASE_SENSITIVE_COLLATION})")}) 373: when :ILIKE, "NOT ILIKE""NOT ILIKE" 374: super(sql, (op == :ILIKE ? :LIKE : "NOT LIKE""NOT LIKE"), args.map{|a| LiteralString.new("(#{literal(a)} COLLATE #{CASE_INSENSITIVE_COLLATION})")}) 375: when :<< 376: sql << complex_expression_arg_pairs(args){|a, b| "(#{literal(a)} * POWER(2, #{literal(b)}))"} 377: when :>> 378: sql << complex_expression_arg_pairs(args){|a, b| "(#{literal(a)} / POWER(2, #{literal(b)}))"} 379: when :extract 380: part = args.at(0) 381: raise(Sequel::Error, "unsupported extract argument: #{part.inspect}") unless format = EXTRACT_MAP[part] 382: if part == :second 383: expr = literal(args.at(1)) 384: sql << DATEPART_SECOND_OPEN << format.to_s << COMMA << expr << DATEPART_SECOND_MIDDLE << expr << DATEPART_SECOND_CLOSE 385: else 386: sql << DATEPART_OPEN << format.to_s << COMMA 387: literal_append(sql, args.at(1)) 388: sql << PAREN_CLOSE 389: end 390: else 391: super 392: end 393: end
Disable the use of INSERT OUTPUT
# File lib/sequel/adapters/shared/mssql.rb, line 405 405: def disable_insert_output 406: clone(:disable_insert_output=>true) 407: end
Disable the use of INSERT OUTPUT, modifying the receiver
# File lib/sequel/adapters/shared/mssql.rb, line 410 410: def disable_insert_output! 411: mutation_method(:disable_insert_output) 412: 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 421 421: def insert_select(*values) 422: return unless supports_insert_select? 423: naked.clone(default_server_opts(:sql=>output(nil, [SQL::ColumnAll.new(:inserted)]).insert_sql(*values))).single_record 424: end
Specify a table for a SELECT … INTO query.
# File lib/sequel/adapters/shared/mssql.rb, line 427 427: def into(table) 428: clone(:into => table) 429: end
MSSQL uses a UNION ALL statement to insert multiple values at once.
# File lib/sequel/adapters/shared/mssql.rb, line 432 432: def multi_insert_sql(columns, values) 433: c = false 434: sql = LiteralString.new('') 435: u = UNION_ALL 436: values.each do |v| 437: sql << u if c 438: sql << SELECT_SPACE 439: expression_list_append(sql, v) 440: c ||= true 441: end 442: [insert_sql(columns, sql)] 443: end
Allows you to do a dirty read of uncommitted data using WITH (NOLOCK).
# File lib/sequel/adapters/shared/mssql.rb, line 446 446: def nolock 447: lock_style(:dirty) 448: 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 462 462: def output(into, values) 463: raise(Error, "SQL Server versions 2000 and earlier do not support the OUTPUT clause") unless supports_output_clause? 464: output = {} 465: case values 466: when Hash 467: output[:column_list], output[:select_list] = values.keys, values.values 468: when Array 469: output[:select_list] = values 470: end 471: output[:into] = into 472: clone({:output => output}) 473: end
The version of the database server.
# File lib/sequel/adapters/shared/mssql.rb, line 487 487: def server_version 488: db.server_version(@opts[:server]) 489: end
MSSQL supports insert_select via the OUTPUT clause.
# File lib/sequel/adapters/shared/mssql.rb, line 502 502: def supports_insert_select? 503: supports_output_clause? && !opts[:disable_insert_output] 504: 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 552 552: def _import(columns, values, opts={}) 553: if opts[:return] == :primary_key && !@opts[:output] 554: output(nil, [SQL::QualifiedIdentifier.new(:inserted, first_primary_key)])._import(columns, values, opts) 555: elsif @opts[:output] 556: statements = multi_insert_sql(columns, values) 557: @db.transaction(opts.merge(:server=>@opts[:server])) do 558: statements.map{|st| with_sql(st)} 559: end.first.map{|v| v.length == 1 ? v.values.first : v} 560: else 561: super 562: end 563: end