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 |
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 |
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 293 293: def initialize(db, opts={}) 294: super 295: @mssql_unicode_strings = db.mssql_unicode_strings 296: end
MSSQL uses + for string concatenation, and LIKE is case insensitive by default.
# File lib/sequel/adapters/shared/mssql.rb, line 299 299: def complex_expression_sql_append(sql, op, args) 300: case op 301: when '||''||' 302: super(sql, :+, args) 303: when :LIKE, "NOT LIKE""NOT LIKE" 304: super(sql, op, args.map{|a| LiteralString.new("(#{literal(a)} COLLATE #{CASE_SENSITIVE_COLLATION})")}) 305: when :ILIKE, "NOT ILIKE""NOT ILIKE" 306: super(sql, (op == :ILIKE ? :LIKE : "NOT LIKE""NOT LIKE"), args.map{|a| LiteralString.new("(#{literal(a)} COLLATE #{CASE_INSENSITIVE_COLLATION})")}) 307: when :<< 308: sql << complex_expression_arg_pairs(args){|a, b| "(#{literal(a)} * POWER(2, #{literal(b)}))"} 309: when :>> 310: sql << complex_expression_arg_pairs(args){|a, b| "(#{literal(a)} / POWER(2, #{literal(b)}))"} 311: when :extract 312: part = args.at(0) 313: raise(Sequel::Error, "unsupported extract argument: #{part.inspect}") unless format = EXTRACT_MAP[part] 314: if part == :second 315: expr = literal(args.at(1)) 316: sql << DATEPART_SECOND_OPEN << format.to_s << COMMA << expr << DATEPART_SECOND_MIDDLE << expr << DATEPART_SECOND_CLOSE 317: else 318: sql << DATEPART_OPEN << format.to_s << COMMA 319: literal_append(sql, args.at(1)) 320: sql << PAREN_CLOSE 321: end 322: else 323: super 324: end 325: end
Disable the use of INSERT OUTPUT
# File lib/sequel/adapters/shared/mssql.rb, line 337 337: def disable_insert_output 338: clone(:disable_insert_output=>true) 339: end
Disable the use of INSERT OUTPUT, modifying the receiver
# File lib/sequel/adapters/shared/mssql.rb, line 342 342: def disable_insert_output! 343: mutation_method(:disable_insert_output) 344: 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 353 353: def insert_select(*values) 354: return unless supports_insert_select? 355: naked.clone(default_server_opts(:sql=>output(nil, [SQL::ColumnAll.new(:inserted)]).insert_sql(*values))).single_record 356: end
Specify a table for a SELECT … INTO query.
# File lib/sequel/adapters/shared/mssql.rb, line 359 359: def into(table) 360: clone(:into => table) 361: end
MSSQL uses a UNION ALL statement to insert multiple values at once.
# File lib/sequel/adapters/shared/mssql.rb, line 364 364: def multi_insert_sql(columns, values) 365: c = false 366: sql = LiteralString.new('') 367: u = UNION_ALL 368: values.each do |v| 369: sql << u if c 370: sql << SELECT_SPACE 371: expression_list_append(sql, v) 372: c ||= true 373: end 374: [insert_sql(columns, sql)] 375: end
Allows you to do a dirty read of uncommitted data using WITH (NOLOCK).
# File lib/sequel/adapters/shared/mssql.rb, line 378 378: def nolock 379: lock_style(:dirty) 380: 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 394 394: def output(into, values) 395: raise(Error, "SQL Server versions 2000 and earlier do not support the OUTPUT clause") unless supports_output_clause? 396: output = {} 397: case values 398: when Hash 399: output[:column_list], output[:select_list] = values.keys, values.values 400: when Array 401: output[:select_list] = values 402: end 403: output[:into] = into 404: clone({:output => output}) 405: end
The version of the database server.
# File lib/sequel/adapters/shared/mssql.rb, line 418 418: def server_version 419: db.server_version(@opts[:server]) 420: end
MSSQL supports insert_select via the OUTPUT clause.
# File lib/sequel/adapters/shared/mssql.rb, line 433 433: def supports_insert_select? 434: supports_output_clause? && !opts[:disable_insert_output] 435: 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 483 483: def _import(columns, values, opts={}) 484: if opts[:return] == :primary_key && !@opts[:output] 485: output(nil, [SQL::QualifiedIdentifier.new(:inserted, first_primary_key)])._import(columns, values, opts) 486: elsif @opts[:output] 487: statements = multi_insert_sql(columns, values) 488: @db.transaction(opts.merge(:server=>@opts[:server])) do 489: statements.map{|st| with_sql(st)} 490: end.first.map{|v| v.length == 1 ? v.values.first : v} 491: else 492: super 493: end 494: end