MSSQL uses + for string concatenation, and LIKE is case insensitive by default.
# File lib/sequel/adapters/shared/mssql.rb, line 210 def complex_expression_sql(op, args) case op when :'||' super(:+, args) when :ILIKE super(:LIKE, args) when :"NOT ILIKE" super(:"NOT LIKE", args) else super(op, args) end end
Disable the use of INSERT OUTPUT
# File lib/sequel/adapters/shared/mssql.rb, line 229 def disable_insert_output clone(:disable_insert_output=>true) end
Disable the use of INSERT OUTPUT, modifying the receiver
# File lib/sequel/adapters/shared/mssql.rb, line 234 def disable_insert_output! mutation_method(:disable_insert_output) end
When returning all rows, if an offset is used, delete the row_number column before yielding the row.
# File lib/sequel/adapters/shared/mssql.rb, line 240 def fetch_rows(sql, &block) @opts[:offset] ? super(sql){|r| r.delete(row_number_column); yield r} : super(sql, &block) end
MSSQL uses the CONTAINS keyword for full text search
# File lib/sequel/adapters/shared/mssql.rb, line 245 def full_text_search(cols, terms, opts = {}) filter("CONTAINS (#{literal(cols)}, #{literal(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 250 def insert_select(*values) return unless supports_output_clause? naked.clone(default_server_opts(:sql=>output(nil, [:inserted.*]).insert_sql(*values))).single_record unless opts[:disable_insert_output] end
Specify a table for a SELECT … INTO query.
# File lib/sequel/adapters/shared/mssql.rb, line 256 def into(table) clone(:into => table) end
MSSQL uses a UNION ALL statement to insert multiple values at once.
# File lib/sequel/adapters/shared/mssql.rb, line 261 def multi_insert_sql(columns, values) [insert_sql(columns, LiteralString.new(values.map {|r| "SELECT #{expression_list(r)}" }.join(" UNION ALL ")))] end
Allows you to do a dirty read of uncommitted data using WITH (NOLOCK).
# File lib/sequel/adapters/shared/mssql.rb, line 266 def nolock lock_style(:dirty) 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 282 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
An output method that modifies the receiver.
# File lib/sequel/adapters/shared/mssql.rb, line 296 def output!(into, values) mutation_method(:output, into, values) end
MSSQL uses [] to quote identifiers
# File lib/sequel/adapters/shared/mssql.rb, line 301 def quoted_identifier(name) "[#{name}]" end
MSSQL Requires the use of the ROW_NUMBER window function to emulate an offset. This implementation requires MSSQL 2005 or greater (offset can't be emulated well in MSSQL 2000).
The implementation is ugly, cloning the current dataset and modifying the clone to add a ROW_NUMBER window function (and some other things), then using the modified clone in a subselect which is selected from.
If offset is used, an order must be provided, because the use of ROW_NUMBER requires an order.
# File lib/sequel/adapters/shared/mssql.rb, line 315 def select_sql return super unless o = @opts[:offset] raise(Error, 'MSSQL requires an order be provided if using an offset') unless order = @opts[:order] dsa1 = dataset_alias(1) rn = row_number_column subselect_sql(unlimited. unordered. select_append{ROW_NUMBER(:over, :order=>order){}.as(rn)}. from_self(:alias=>dsa1). limit(@opts[:limit]). where(SQL::Identifier.new(rn) > o)) end
The version of the database server.
# File lib/sequel/adapters/shared/mssql.rb, line 329 def server_version db.server_version(@opts[:server]) end
Microsoft SQL Server does not support INTERSECT or EXCEPT
# File lib/sequel/adapters/shared/mssql.rb, line 334 def supports_intersect_except? false end
MSSQL does not support IS TRUE
# File lib/sequel/adapters/shared/mssql.rb, line 339 def supports_is_true? false end
MSSQL doesn't support JOIN USING
# File lib/sequel/adapters/shared/mssql.rb, line 344 def supports_join_using? false end
MSSQL 2005+ supports modifying joined datasets
# File lib/sequel/adapters/shared/mssql.rb, line 349 def supports_modifying_joins? true end
MSSQL does not support multiple columns for the IN/NOT IN operators
# File lib/sequel/adapters/shared/mssql.rb, line 354 def supports_multiple_column_in? false end
Only 2005+ supports the output clause.
# File lib/sequel/adapters/shared/mssql.rb, line 359 def supports_output_clause? server_version >= 9000000 end
MSSQL 2005+ supports window functions
# File lib/sequel/adapters/shared/mssql.rb, line 364 def supports_window_functions? true end
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