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 352 352: def insert_select(*values) 353: return unless supports_insert_select? 354: naked.clone(default_server_opts(:sql=>output(nil, [SQL::ColumnAll.new(:inserted)]).insert_sql(*values))).single_record 355: end
Specify a table for a SELECT … INTO query.
# File lib/sequel/adapters/shared/mssql.rb, line 358 358: def into(table) 359: clone(:into => table) 360: end
MSSQL uses a UNION ALL statement to insert multiple values at once.
# File lib/sequel/adapters/shared/mssql.rb, line 363 363: def multi_insert_sql(columns, values) 364: c = false 365: sql = LiteralString.new('') 366: u = UNION_ALL 367: values.each do |v| 368: sql << u if c 369: sql << SELECT_SPACE 370: expression_list_append(sql, v) 371: c ||= true 372: end 373: [insert_sql(columns, sql)] 374: end
Allows you to do a dirty read of uncommitted data using WITH (NOLOCK).
# File lib/sequel/adapters/shared/mssql.rb, line 377 377: def nolock 378: lock_style(:dirty) 379: 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 393 393: def output(into, values) 394: raise(Error, "SQL Server versions 2000 and earlier do not support the OUTPUT clause") unless supports_output_clause? 395: output = {} 396: case values 397: when Hash 398: output[:column_list], output[:select_list] = values.keys, values.values 399: when Array 400: output[:select_list] = values 401: end 402: output[:into] = into 403: clone({:output => output}) 404: end
The version of the database server.
# File lib/sequel/adapters/shared/mssql.rb, line 417 417: def server_version 418: db.server_version(@opts[:server]) 419: end
MSSQL supports insert_select via the OUTPUT clause.
# File lib/sequel/adapters/shared/mssql.rb, line 422 422: def supports_insert_select? 423: supports_output_clause? && !opts[:disable_insert_output] 424: end