MSSQL uses + for string concatenation, and LIKE is case insensitive by default.
# File lib/sequel/adapters/shared/mssql.rb, line 563 def complex_expression_sql_append(sql, op, args) case op when :'||' super(sql, :+, args) when :LIKE, :"NOT LIKE" super(sql, op, args.map{|a| Sequel.lit(["(", " COLLATE #{CASE_SENSITIVE_COLLATION})"], a)}) when :ILIKE, :"NOT ILIKE" super(sql, (op == :ILIKE ? :LIKE : :"NOT LIKE"), args.map{|a| Sequel.lit(["(", " COLLATE #{CASE_INSENSITIVE_COLLATION})"], a)}) when :<<, :>> complex_expression_emulate_append(sql, op, args) when :extract part = args.at(0) raise(Sequel::Error, "unsupported extract argument: #{part.inspect}") unless format = EXTRACT_MAP[part] if part == :second expr = args.at(1) sql << DATEPART_SECOND_OPEN << format.to_s << COMMA literal_append(sql, expr) sql << DATEPART_SECOND_MIDDLE literal_append(sql, expr) sql << DATEPART_SECOND_CLOSE else sql << DATEPART_OPEN << format.to_s << COMMA literal_append(sql, args.at(1)) sql << PAREN_CLOSE end else super end end
Uses CROSS APPLY to join the given table into the current dataset.
# File lib/sequel/adapters/shared/mssql.rb, line 603 def cross_apply(table) join_table(:cross_apply, table) end
Disable the use of INSERT OUTPUT
# File lib/sequel/adapters/shared/mssql.rb, line 608 def disable_insert_output clone(:disable_insert_output=>true) end
MSSQL treats [] as a metacharacter in LIKE expresions.
# File lib/sequel/adapters/shared/mssql.rb, line 613 def escape_like(string) string.gsub(/[\\%_\[\]]/){|m| "\\#{m}"} end
MSSQL uses the CONTAINS keyword for full text search
# File lib/sequel/adapters/shared/mssql.rb, line 618 def full_text_search(cols, terms, opts = OPTS) terms = "\"#{terms.join('" OR "')}\"" if terms.is_a?(Array) filter("CONTAINS (?, ?)", cols, terms) 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 624 def insert_select(*values) return unless supports_insert_select? with_sql_first(insert_select_sql(*values)) 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 631 def insert_select_sql(*values) ds = (opts[:output] || opts[:returning]) ? self : output(nil, [SQL::ColumnAll.new(:inserted)]) ds.insert_sql(*values) end
Specify a table for a SELECT ... INTO query.
# File lib/sequel/adapters/shared/mssql.rb, line 637 def into(table) clone(:into => table) end
Use the database's mssql_unicode_strings setting if the dataset hasn't overridden it.
# File lib/sequel/adapters/shared/mssql.rb, line 558 def mssql_unicode_strings defined?(@mssql_unicode_strings) ? @mssql_unicode_strings : (@mssql_unicode_strings = db.mssql_unicode_strings) end
Allows you to do a dirty read of uncommitted data using WITH (NOLOCK).
# File lib/sequel/adapters/shared/mssql.rb, line 642 def nolock lock_style(:dirty) end
Uses OUTER APPLY to join the given table into the current dataset.
# File lib/sequel/adapters/shared/mssql.rb, line 647 def outer_apply(table) join_table(:outer_apply, table) 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 663 def output(into, values) raise(Error, "SQL Server versions 2000 and earlier do not support the OUTPUT clause") unless supports_output_clause? output = {} case values when Hash output[:column_list], output[:select_list] = values.keys, values.values when Array output[:select_list] = values end output[:into] = into clone(:output => output) end
MSSQL uses [] to quote identifiers.
# File lib/sequel/adapters/shared/mssql.rb, line 677 def quoted_identifier_append(sql, name) sql << BRACKET_OPEN << name.to_s.gsub(/\]/, DOUBLE_BRACKET_CLOSE) << BRACKET_CLOSE end
Emulate RETURNING using the output clause. This only handles values that are simple column references.
# File lib/sequel/adapters/shared/mssql.rb, line 682 def returning(*values) values = values.map do |v| unless r = unqualified_column_for(v) raise(Error, "cannot emulate RETURNING via OUTPUT for value: #{v.inspect}") end r end clone(:returning=>values) 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 696 def select_sql if @opts[:offset] && !@opts[:order] && is_2012_or_later? order(1).select_sql else super end end
The version of the database server.
# File lib/sequel/adapters/shared/mssql.rb, line 705 def server_version db.server_version(@opts[:server]) end
# File lib/sequel/adapters/shared/mssql.rb, line 709 def supports_cte?(type=:select) is_2005_or_later? end
MSSQL 2005+ supports GROUP BY CUBE.
# File lib/sequel/adapters/shared/mssql.rb, line 714 def supports_group_cube? is_2005_or_later? end
MSSQL 2005+ supports GROUP BY ROLLUP
# File lib/sequel/adapters/shared/mssql.rb, line 719 def supports_group_rollup? is_2005_or_later? end
MSSQL supports insert_select via the OUTPUT clause.
# File lib/sequel/adapters/shared/mssql.rb, line 724 def supports_insert_select? supports_output_clause? && !opts[:disable_insert_output] end
MSSQL 2005+ supports INTERSECT and EXCEPT
# File lib/sequel/adapters/shared/mssql.rb, line 729 def supports_intersect_except? is_2005_or_later? end
MSSQL does not support IS TRUE
# File lib/sequel/adapters/shared/mssql.rb, line 734 def supports_is_true? false end
MSSQL doesn't support JOIN USING
# File lib/sequel/adapters/shared/mssql.rb, line 739 def supports_join_using? false end
MSSQL 2005+ supports modifying joined datasets
# File lib/sequel/adapters/shared/mssql.rb, line 744 def supports_modifying_joins? is_2005_or_later? end
MSSQL does not support multiple columns for the IN/NOT IN operators
# File lib/sequel/adapters/shared/mssql.rb, line 749 def supports_multiple_column_in? false end
MSSQL cannot use WHERE 1.
# File lib/sequel/adapters/shared/mssql.rb, line 774 def supports_where_true? false end
MSSQL 2005+ supports window functions
# File lib/sequel/adapters/shared/mssql.rb, line 769 def supports_window_functions? true 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 784 def _import(columns, values, opts=OPTS) if opts[:return] == :primary_key && !@opts[:output] output(nil, [SQL::QualifiedIdentifier.new(:inserted, first_primary_key)])._import(columns, values, opts) elsif @opts[:output] statements = multi_insert_sql(columns, values) @db.transaction(opts.merge(:server=>@opts[:server])) do statements.map{|st| with_sql(st)} end.first.map{|v| v.length == 1 ? v.values.first : v} else super end end
MSSQL does not allow ordering in sub-clauses unless 'top' (limit) is specified
# File lib/sequel/adapters/shared/mssql.rb, line 798 def aggregate_dataset (options_overlap(Sequel::Dataset::COUNT_FROM_SELF_OPTS) && !options_overlap([:limit])) ? unordered.from_self : super end
Generated with the Darkfish Rdoc Generator 2.