/usr/lib/ruby/vendor_ruby/sequel/adapters/ado/mssql.rb is in ruby-sequel 4.15.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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module Sequel
module ADO
# Database and Dataset instance methods for MSSQL specific
# support via ADO.
module MSSQL
module DatabaseMethods
extend Sequel::Database::ResetIdentifierMangling
include Sequel::MSSQL::DatabaseMethods
# Query to use to get the number of rows affected by an update or
# delete query.
ROWS_AFFECTED = "SELECT @@ROWCOUNT AS AffectedRows"
# Issue a separate query to get the rows modified. ADO appears to
# use pass by reference with an integer variable, which is obviously
# not supported directly in ruby, and I'm not aware of a workaround.
def execute_dui(sql, opts=OPTS)
return super unless @opts[:provider]
synchronize(opts[:server]) do |conn|
begin
log_yield(sql){conn.Execute(sql)}
res = log_yield(ROWS_AFFECTED){conn.Execute(ROWS_AFFECTED)}
res.getRows.transpose.each{|r| return r.shift}
rescue ::WIN32OLERuntimeError => e
raise_error(e)
end
end
end
private
# The ADO adapter's default provider doesn't support transactions, since it
# creates a new native connection for each query. So Sequel only attempts
# to use transactions if an explicit :provider is given.
def begin_transaction(conn, opts=OPTS)
super if @opts[:provider]
end
def commit_transaction(conn, opts=OPTS)
super if @opts[:provider]
end
def rollback_transaction(conn, opts=OPTS)
super if @opts[:provider]
end
end
class Dataset < ADO::Dataset
include Sequel::MSSQL::DatasetMethods
# Use a nasty hack of multiple SQL statements in the same call and
# having the last one return the most recently inserted id. This
# is necessary as ADO's default :provider uses a separate native
# connection for each query.
def insert(*values)
return super if @opts[:sql]
with_sql("SET NOCOUNT ON; #{insert_sql(*values)}; SELECT CAST(SCOPE_IDENTITY() AS INTEGER)").single_value
end
# If you use a better :provider option for the database, you can get an
# accurate number of rows matched.
def provides_accurate_rows_matched?
!!db.opts[:provider]
end
end
end
end
end
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