class Traject::HorizonReader
Settings¶ ↑
Connection¶ ↑
- horizon.jdbc_url
-
JDBC connection URL using jtds. Should include username, but not password. See `horizon.jdbc_password` setting, kept seperate so we can try to suppress it from logging. Eg: “jdbc:jtds:sybase://horizon.lib.univ.edu:2025/dbname;user=dbuser”
-
In command line, you'll have to use quotes: -s 'horizon.jdbc_url=jdbc:jtds:sybase://horizon.lib.univ.edu:2025/dbname;user=dbuser'
-
- horizon.password
-
Password to use for JDBC connection. We'll try to suppress it from being logged.
Instead of jdbc_url
, you can provide all the other elements individually:
- horizon.host
- horizon.port
-
(default 2025)
- horizon.user
- horizon.database
-
(default 'horizon')
- horizon.jtds_type
-
default 'sybase', or 'sqlserver'
- horizon.timeout
-
value in SECONDS given to jtds driver for socketTimeout and loginTimeout. if this is not set, if Horizon db or server goes down in mid-export, your program may hang forever. However, the trade-off is when this is set, a slow query may trigger timeout. As a compromise, we've set DEFAULT to 1200 seconds (20 minutes).
What to export¶ ↑
Normally exports the entire horizon database, for diagnostic or batch purposes you can export just one bib, or a range of bibs instead.
- horizon.first_bib
-
Greater than equal to this bib number. Can be combined with horizon.last_bib
- horizon.last_bib
-
Less than or equal to this bib number. Can be combined with horizon.first_bib
- horizon.only_bib
-
Only this single bib number.
You can also control whether to export staff-only bibs, copies, and items.
- horizon.public_only
-
Default true. If set to true, only includes bibs that are NOT staff_only, also only include copy/item that are not staff-only if including copy/item.
You can also exclude certain tags:
- horizon.exclude_tags
-
Default nil. A comma-seperated string (so easy to supply on command line)
of tag names to exclude from export. You probably want to at least include the tags you are using for horizon.item_tag and horizon.copy_tag, to avoid collision from tags already in record.
Item/Copy Inclusion¶ ↑
The HorizonReader
can export MARC with holdings information (horizon items and copies) included in the MARC. Each item or copy record will be represented as one marc field – the tags used are configurable. You can configure how individual columns from item or copy tables map to MARC subfields in that field – and also include columns from other tables joined to item or copy.
- horizon.include_holdings
-
false, nil, or empty string: Do not include holdings. (DEFAULT)
-
all: include copies and items
-
items: only include items
-
copies: only include copies
-
direct: only include copies OR items, but not both; if bib has include copies, otherwise include items if present.
-
Each item or copy will be one marc field, you can configure what tags these fields will have.
- horizon.item_tag
-
Default “991”.
- horizon.copy_tag
-
Default “937”
Which columns from item or copy tables will be mapped to which subfields in those fields is controlled by hashes in settings, hash from column name (with table prefix) to subfield code. There are defaults, see HorizonReader.default_settings
. Example for item_map default:
“horizon.item_map” => {
"item.call_reconstructed" => "a", "collection.call_type" => "b", "item.copy_reconstructed" => "c", "call_type.processor" => "f", "item.item#" => "i", "item.collection" => "l", "item.location" => "m", "item.notes" => "n", "item.staff_only" => "q" }
- horizon.item_map
- horizon.copy_map
-
The column-to-subfield maps can include columns from other tables joined in, with a join clause configured in settings too. By default both item and copy join to: collection, and call_type – using some clever SQL to join to call_type on the item/copy fk, OR the associated collection fk if no specific item/copy one is defined.
- horizon.item_join_clause
- horizon.copy_join_clause
-
Character Encoding¶ ↑
The
HorizonReader
can convert from Marc8 to UTF8. By default `horizon.source_encoding` is set to “MARC8” and `horizon.destination_encoding` is set to “UTF8”, which will make it do that conversion, as well as set the leader byte for char encoding properly.Any other configuration of those settings, and no transcoding will take place,
HorizonReader
is not currently capable of doing any other transcoding. Set or `horizon.destination_encoding` to nil if you don't want any transcoding to happen – you'd only want this for diagnostic purposes, or if your horizon db is already utf8 (is that possible? We don't know.)- horizon.codepoint_translate
-
translates from Horizon's weird <U+nnnn> unicode
codepoint escaping to actual UTF-8 bytes. Defaults to true. Will be ignored unless horizon.destination_encoding is UTF8 though.
- horizon.character_reference_translate
-
Default true. Convert HTML/XML-style
character references like "‏" to actual UTF-8 bytes, when converting to UTF8. These character references are oddly legal representations of UTF8 in MARC8. http://www.loc.gov/marc/specifications/speccharconversion.html#lossless
Note
HorizonReader
will also remove control chars from output (except for ones with legal meaning in binary MARC) – these are errors in Horizon db which mean nothing, are illegal in MARC binary serialization, and can mess things up.Misc¶ ↑
- horizon.batch_size
-
Batch size to use for fetching item/copy info on each bib. Default 400.
- debug_ascii_progress
-
if true, will output a “<” and a “>” to stderr around every copy/item
subsidiary fetch. See description of this setting in docs/settings.md
- jtds.jar_path
-
Normally we'll use a distribution of jtds bundled with this gem. But specify a filepath of a directory containing jtds jar(s), and all jars in that dir will be loaded instead of our bundled jtds.
- horizon.item_join_clause
Attributes
Public Class Methods
# File lib/traject/horizon_reader.rb, line 728 def self.default_settings { "horizon.timeout" => 1200, # 1200 seconds == 20 minutes "horizon.batch_size" => 400, "horizon.public_only" => true, "horizon.source_encoding" => "MARC8", "horizon.destination_encoding" => "UTF8", "horizon.codepoint_translate" => true, "horizon.character_reference_translate" => true, "horizon.item_tag" => "991", # Crazy isnull() in the call_type join to join to call_type directly on item # if specified otherwise calltype on colleciton. Phew! "horizon.item_join_clause" => "LEFT OUTER JOIN collection ON item.collection = collection.collection LEFT OUTER JOIN call_type ON isnull(item.call_type, collection.call_type) = call_type.call_type", "horizon.item_map" => { "item.call_reconstructed" => "a", "call_type.processor" => "f", "call_type.call_type" => "b", "item.copy_reconstructed" => "c", "item.staff_only" => "q", "item.item#" => "i", "item.collection" => "l", "item.notes" => "n", "item.location" => "m" }, "horizon.copy_tag" => "937", # Crazy isnull() in the call_type join to join to call_type directly on item # if specified otherwise calltype on colleciton. Phew! "horizon.copy_join_clause" => "LEFT OUTER JOIN collection ON copy.collection = collection.collection LEFT OUTER JOIN call_type ON isnull(copy.call_type, collection.call_type) = call_type.call_type", "horizon.copy_map" => { "copy.copy#" => "8", "copy.call" => "a", "copy.copy_number" => "c", "call_type.processor" => "f", "copy.staff_only" => "q", "copy.location" => "m", "copy.collection" => "l", "copy.pac_note" => "n" } } end
We ignore the iostream even though we get one, we're gonna read from a Horizon DB!
# File lib/traject/horizon_reader.rb, line 150 def initialize(iostream, settings) # we ignore the iostream, we're fetching from Horizon db @settings = Traject::Indexer::Settings.new( self.class.default_settings).merge(settings) require_jars! logger.info(" #{self.class.name} reading records from #{jdbc_url(false)}") end
Public Instance Methods
Returns a DataField or ControlField, can return nil if determined no field can/should be created.
Do not call for field '0' (leader) or field 001, this doesn't handle those, will just return nil.
First arg is a Marc4J ErrorHandler object, kind of a weird implementation detail.
Other args are objects fetched from Horizon db via JDBC – text and authtext must be byte arrays.
# File lib/traject/horizon_reader.rb, line 445 def build_marc_field!(error_handler, tag, indicators, text, authtext) # convert text and authtext from java bytes to a ruby # binary string. if text text = String.from_java_bytes(text) text.force_encoding("binary") end if authtext authtext = String.from_java_bytes(authtext) authtext.force_encoding("binary") end text = Traject::HorizonBibAuthMerge.new(tag, text, authtext).merge! return nil if text.nil? # sometimes there's nothing there, skip it. # convert from MARC8 to UTF8 if needed text = convert_text!(text, error_handler) if MARC::ControlField.control_tag?(tag) # control field return MARC::ControlField.new(tag, text ) else # data field indicator1 = indicators.slice(0) indicator2 = indicators.slice(1) data_field = MARC::DataField.new( tag, indicator1, indicator2 ) subfields = text.split("\x1F") subfields.each do |subfield| next if subfield.empty? subfield_code = subfield.slice(0) subfield_text = subfield.slice(1, subfield.length) data_field.append MARC::Subfield.new(subfield_code, subfield_text) end return data_field end end
# File lib/traject/horizon_reader.rb, line 677 def convert_marc8_to_utf8? settings['horizon.source_encoding'] == "MARC8" && settings['horizon.destination_encoding'] == "UTF8" end
Converts from Marc8 to UTF8 if neccesary.
Also replaces escaped unicode codepoints using custom Horizon “<U+nnnn>” format Or standard MARC 'lossless encoding' “&#xHHHH;” format.
# File lib/traject/horizon_reader.rb, line 275 def convert_text!(text, error_handler) text = AnselToUnicode.new(error_handler, true).convert(text) if convert_marc8_to_utf8? # Turn Horizon's weird escaping into UTF8: <U+nnnn> where nnnn is a hex unicode # codepoint, turn it UTF8 for that codepoint if settings["horizon.destination_encoding"] == "UTF8" && (settings["horizon.codepoint_translate"].to_s == "true" || settings["horizon.character_reference_translate"].to_s == "true") regexp = if settings["horizon.codepoint_translate"].to_s == "true" && settings["horizon.character_reference_translate"].to_s == "true" # unicode codepoint in either HTML char reference form OR # weird horizon form. /(?:\<U\+|&#x)([0-9A-Fa-f]{4})(?:\>|;)/ elsif settings["horizon.codepoint_translate"].to_s == "true" # just weird horizon form /\<U\+([0-9A-Fa-f]{4})\>/ else # just character references /&#x([0-9A-Fa-f]{4});/ end text.gsub!(regexp) do [$1.hex].pack("U") end end # eliminate illegal control chars. All ASCII less than 0x20 # _except_ for four legal ones (including MARC delimiters). # http://www.loc.gov/marc/specifications/specchargeneral.html#controlfunction # this is all bytes from 0x00 to 0x19 except for the allowed 1B, 1D, 1E, 1F. text.gsub!(/[\x00-\x1A\x1C]/, '') return text end
Read rows from horizon database, assemble them into MARC::Record's, and yield each MARC::Record to caller.
# File lib/traject/horizon_reader.rb, line 311 def each # Need to close the connection, teh result_set, AND the result_set.getStatement when # we're done. connection = open_connection! # We're going to need to ask for item/copy info while in the # middle of streaming our results. JDBC is happier and more performant # if we use a seperate connection for this. extra_connection = open_connection! if include_some_holdings? # We're going to make our marc records in batches, and only yield # them to caller in batches, so we can fetch copy/item info in batches # for efficiency. batch_size = settings["horizon.batch_size"].to_i record_batch = [] exclude_tags = (settings["horizon.exclude_tags"] || "").split(",") rs = self.fetch_result_set!(connection) current_bib_id = nil record = nil record_count = 0 error_handler = org.marc4j.ErrorHandler.new while(rs.next) bib_id = rs.getInt("bib#"); if bib_id != current_bib_id record_count += 1 if settings["debug_ascii_progress"] && (record_count % settings["solrj_writer.batch_size"] == 0) $stderr.write "," end # new record! Put old one on batch queue. record_batch << record if record # prepare and yield batch? if (record_count % batch_size == 0) enhance_batch!(extra_connection, record_batch) record_batch.each do |r| # set current_bib_id for error logging current_bib_id = r['001'].value yield r end record_batch.clear end # And start new record we've encountered. error_handler = org.marc4j.ErrorHandler.new current_bib_id = bib_id record = MARC::Record.new record.append MARC::ControlField.new("001", bib_id.to_s) end tagord = rs.getInt("tagord"); tag = rs.getString("tag") # just silently skip it, some weird row in the horizon db, it happens. # plus any of our exclude_tags. next if tag.nil? || tag == "" || exclude_tags.include?(tag) indicators = rs.getString("indicators") # a packed byte array could be in various columns, in order of preference... # the xref stuff is joined in from the auth table # Have to get it as bytes and then convert it to String to avoid JDBC messing # up the encoding marc8 grr authtext = rs.getBytes("xref_longtext") || rs.getBytes("xref_text") text = rs.getBytes("longtext") || rs.getBytes("text") if tag == "000" # Horizon puts a \x1E marc field terminator on the end of hte # leader in the db too, but that's not really part of it. record.leader = String.from_java_bytes(text).chomp("\x1E") fix_leader!(record.leader) elsif tag != "001" # we add an 001 ourselves with bib id in another part of code. field = build_marc_field!(error_handler, tag, indicators, text, authtext) record.append field unless field.nil? end end # last one record_batch << record if record # yield last batch enhance_batch!(extra_connection, record_batch) record_batch.each do |r| yield r end record_batch.clear rescue Exception => e logger.fatal "HorizonReader, unexpected exception at bib id:#{current_bib_id}: #{e}" raise e ensure logger.info("HorizonReader: Closing all JDBC objects...") # have to cancel the statement to keep us from waiting on entire # result set when exception is raised in the middle of stream. statement = rs && rs.getStatement if statement statement.cancel statement.close end rs.close if rs # shouldn't actually need to close the resultset and statement if we cancel, I think. connection.close if connection extra_connection.close if extra_connection logger.info("HorizonReader: Closed JDBC objects") end
Pass in an array of MARC::Records', adds fields for copy and item info if so configured. Returns record_batch so you can chain if you want.
# File lib/traject/horizon_reader.rb, line 492 def enhance_batch!(conn, record_batch) return record_batch if record_batch.nil? || record_batch.empty? copy_info = get_joined_table( conn, record_batch, :table_name => "copy", :column_map => settings['horizon.copy_map'], :join_clause => settings['horizon.copy_join_clause'], :public_only => (settings['horizon.public_only'].to_s == "true") ) if %w{all copies direct}.include? settings['horizon.include_holdings'].to_s item_info = get_joined_table( conn, record_batch, :table_name => "item", :column_map => settings['horizon.item_map'], :join_clause => settings['horizon.item_join_clause'], :public_only => (settings['horizon.public_only'].to_s == "true") ) if %w{all items direct}.include? settings['horizon.include_holdings'].to_s if item_info || copy_info record_batch.each do |record| id = record['001'].value.to_s record_copy_info = copy_info && copy_info[id] record_item_info = item_info && item_info[id] record_copy_info.each do |copy_row| field = MARC::DataField.new( settings["horizon.copy_tag"] ) copy_row.each_pair do |subfield, value| field.append MARC::Subfield.new(subfield, value) end record.append field end if record_copy_info record_item_info.each do |item_row| field = MARC::DataField.new( settings["horizon.item_tag"] ) item_row.each_pair do |subfield, value| field.append MARC::Subfield.new(subfield, value) end record.append field end if record_item_info && ((settings['horizon.include_holdings'].to_s != "direct") || record_copy_info.empty?) end end return record_batch end
# File lib/traject/horizon_reader.rb, line 192 def fetch_result_set!(conn) #fullbib is a view in Horizon, I think it was an SD default view, that pulls #in stuff from multiple tables, including authority tables, to get actual # text. # You might think need an ORDER BY, but doing so makes it incredibly slow # to retrieve results, can't do it. We just count on the view returning # the rows properly. (ORDER BY bib#, tagord) # # We start with the fullbib view defined out of the box in Horizon, but # need to join in bib_control to have access to the staff_only column. # sql = <<-EOS SELECT b.bib#, b.tagord, b.tag, indicators = substring(b.indicators+' ',1,2)+a.indicators, b.text, b.cat_link_type#, b.cat_link_xref#, b.link_type, bl.longtext, xref_text = a.text, xref_longtext = al.longtext, b.timestamp, auth_timestamp = a.timestamp, bc.staff_only FROM bib b left join bib_control bc on b.bib# = bc.bib# left join bib_longtext bl on b.bib# = bl.bib# and b.tag = bl.tag and b.tagord = bl.tagord left join auth a on b.cat_link_xref# = a.auth# and a.tag like '1[0-9][0-9]' left join auth_longtext al on b.cat_link_xref# = al.auth# and al.tag like '1[0-9][0-9]' WHERE 1 = 1 EOS sql = <<-EOS SELECT b.* FROM fullbib b WHERE 1 = 1 EOS # Oddly, Sybase seems to do a lot BETTER when we make this a sub-query # as opposed to a join. Join was resulting in "Can't allocate space for object 'temp worktable' in database 'tempdb'" # from Sybase, but somehow we get away with subquery? # # Note this subquery we managed to not refer to outer scope, that's the key. if settings["horizon.public_only"].to_s == "true" sql+= " AND b.bib# NOT IN (SELECT DISTINCT bc.bib# from bib_control bc WHERE bc.staff_only = 1) " end # settings should not be coming from untrusted user input not going # to bother worrying about sql injection. if settings.has_key? "horizon.only_bib" sql += " AND b.bib# = #{settings['horizon.only_bib']} " elsif settings.has_key?("horizon.first_bib") || settings.has_key?("horizon.last_bib") clauses = [] clauses << " b.bib# >= #{settings['horizon.first_bib']}" if settings['horizon.first_bib'] clauses << " b.bib# <= #{settings['horizon.last_bib']}" if settings['horizon.last_bib'] sql += " AND " + clauses.join(" AND ") + " " end # without the order by, rows come back in mostly the right order, # by bib#, but fairly common do NOT as well. # -- when they don't, it can cause one real # record to be split up into multiple partial output record, which # cna overwrite each other in the solr index. # # So we sort -- which makes query slower, and makes it a lot harder # to avoid Sybase "cannot allocate space" errors, but we've got # no real choice. Ideally we might include 'tagord' # in the sort too, but that seems to make performance even worse, # we're willing to risk tags not being reassembled in exactly the # right order, usually they are anyway, and it doesn't usually matter anyway. sql+= " ORDER BY b.bib# " # ", tagord" would be even better, but slower. pstmt = conn.prepareStatement(sql, ResultSet.TYPE_FORWARD_ONLY, ResultSet.CONCUR_READ_ONLY); # this may be what's neccesary to keep the driver from fetching # entire result set into memory. pstmt.setFetchSize(10000) logger.debug("HorizonReader: Executing query: #{sql}") rs = pstmt.executeQuery logger.debug("HorizonReader: Executed!") return rs end
Mutate string passed in to fix leader bytes for marc21
# File lib/traject/horizon_reader.rb, line 633 def fix_leader!(leader) if leader.length < 24 # pad it to 24 bytes, leader is supposed to be 24 bytes leader.replace( leader.ljust(24, ' ') ) elsif leader.length > 24 # Also a problem, slice it leader.replace( leader.byteslice(0, 24)) end # http://www.loc.gov/marc/bibliographic/ecbdldrd.html leader[10..11] = '22' leader[20..23] = '4500' if settings['horizon.destination_encoding'] == "UTF8" leader[9] = 'a' end # leader should only have ascii chars in it; invalid non-ascii # chars can cause ruby encoding problems down the line. # additionally, a force_encoding may be neccesary to # deal with apparent weird hard to isolate jruby bug prob same one # as at https://github.com/jruby/jruby/issues/886 leader.force_encoding('ascii') unless leader.valid_encoding? # replace any non-ascii chars with a space. # Can't access leader.chars when it's not a valid encoding # without a weird index out of bounds exception, think it's # https://github.com/jruby/jruby/issues/886 # Grr. #leader.replace( leader.chars.collect { |c| c.valid_encoding? ? c : ' ' }.join('') ) leader.replace(leader.split('').collect { |c| c.valid_encoding? ? c : ' ' }.join('')) end end
Can be used to fetch a batch of subsidiary info from other tables: Used to fetch item or copy information. Can fetch with joins too. Usually called by passing in settings, but a literal call might look something like this for items:
get_joined_table
(jdbc_conn, array_of_marc_records,
:table_name => "item", :column_map => {"item.item#" => "i", "call_type.processor" => "k"}, :join_clause => "JOIN call_type ON item.call_type = call_type.call_type"
)
Returns a hash keyed by bibID, value is an array of hashes of subfield->value, eg:
{'343434' => [
{ 'i' => "012124" # item.item# 'k' => 'lccn' # call_type.processor } ]
}
Can also pass in a `:public_only => true` option, will add on a staff_only != 1 where clause, assumes primary table has a staff_only column.
# File lib/traject/horizon_reader.rb, line 565 def get_joined_table(conn, batch, options = {}) table_name = options[:table_name] or raise ArgumentError.new("Need a :table_name option") column_map = options[:column_map] or raise ArgumentError.new("Need a :column_map option") join_clause = options[:join_clause] || "" public_only = options[:public_only] results = Hash.new {|h, k| h[k] = [] } bib_ids_joined = batch.collect do |record| record['001'].value.to_s end.join(",") # We include the column name with prefix as an "AS", so we can fetch it out # of the result set later just like that. columns_clause = column_map.keys.collect {|c| "#{c} AS '#{c}'"}.join(",") sql = <<-EOS SELECT bib#, #{columns_clause} FROM #{table_name} #{join_clause} WHERE bib# IN (#{bib_ids_joined}) EOS if public_only sql += " AND staff_only != 1" end $stderr.write "<" if settings["debug_ascii_progress"] # It might be higher performance to refactor to re-use the same prepared statement # for each item/copy fetch... but appears to be no great way to do that in JDBC3 # where you need to parameterize "IN" values. JDBC4 has got it, but jTDS is just JDBC3. pstmt = conn.prepareStatement(sql, ResultSet.TYPE_FORWARD_ONLY, ResultSet.CONCUR_READ_ONLY); rs = pstmt.executeQuery while (rs.next) bib_id = rs.getString("bib#") row_hash = {} column_map.each_pair do |column, subfield| value = rs.getString( column ) if value # Okay, total hack to deal with the fact that holding notes # seem to be in UTF8 even though records are in MARC... which # ends up causing problems for exporting as marc8, which is # handled kind of not very well anyway. # I don't even totally understand what I'm doing, after 6 hours working on it, # sorry, just a hack. value.force_encoding("BINARY") unless settings["horizon.destination_encoding"] == "UTF8" row_hash[subfield] = value end end results[bib_id] << row_hash end return results ensure pstmt.cancel if pstmt pstmt.close if pstmt rs.close if rs $stderr.write ">" if settings["debug_ascii_progress"] end
# File lib/traject/horizon_reader.rb, line 673 def include_some_holdings? ! [false, nil, ""].include?(settings['horizon.include_holdings']) end
Looks up JDBC url from settings, either 'horizon.jdbc_url' if present, or individual settings. Will include password from `horizon.password` only if given a `true` arg – leave false for output to logs, to keep password out of logs.
# File lib/traject/horizon_reader.rb, line 685 def jdbc_url(include_password=false) url = if settings.has_key? "horizon.jdbc_url" settings["horizon.jdbc_url"] else jtds_type = settings['horizon.jtds_type'] || 'sybase' database = settings['horizon.database'] || 'horizon' host = settings['horizon.host'] or raise ArgumentError.new("Need horizon.host setting, or horizon.jdbc_url") port = settings['horizon.port'] || '2025' user = settings['horizon.user'] or raise ArgumentError.new("Need horizon.user setting, or horizon.jdbc_url") "jdbc:jtds:#{jtds_type}://#{host}:#{port}/#{database};user=#{user}" end # Not sure if useCursors makes a difference, but just in case. url += ";useCursors=true" if timeout = settings['horizon.timeout'] url += ";socketTimeout=#{timeout};loginTimeout=#{timeout}" end if include_password password = settings['horizon.password'] or raise ArgumentError.new("Need horizon.password setting") url += ";password=#{password}" end return url end
# File lib/traject/horizon_reader.rb, line 724 def logger settings["logger"] || Yell::Logger.new(STDERR, :level => "gt.fatal") # null logger end
# File lib/traject/horizon_reader.rb, line 713 def open_connection! logger.debug("HorizonReader: Opening JDBC Connection at #{jdbc_url(false)} ...") conn = java.sql.DriverManager.getConnection( jdbc_url(true) ) # If autocommit on, fetchSize later has no effect, and JDBC slurps # the whole result set into memory, which we can not handle. conn.setAutoCommit false logger.debug("HorizonReader: Opened JDBC Connection.") return conn end
Requires marc4j and jtds, and java_import's some classes.
# File lib/traject/horizon_reader.rb, line 161 def require_jars! require 'jruby' # ask marc-marc4j gem to load the marc4j jars MARC::MARC4J.new(:jardir => settings['marc4j_reader.jar_dir']) # For some reason we seem to need to java_import it, and use # a string like this. can't just refer to it by full # qualified name, not sure why, but this seems to work. java_import "org.marc4j.converter.impl.AnselToUnicode" unless defined? Java::net.sourceforge.jtds.jdbc.Driver jtds_jar_dir = settings["jtds.jar_path"] || File.expand_path("../../vendor/jtds", File.dirname(__FILE__)) Dir.glob("#{jtds_jar_dir}/*.jar") do |x| require x end # For confusing reasons, in normal Java need to # Class.forName("net.sourceforge.jtds.jdbc.Driver") # to get the jtds driver to actually be recognized by JDBC. # # In Jruby, Class.forName doesn't work, but this seems # to do the same thing: Java::net.sourceforge.jtds.jdbc.Driver end # So we can refer to these classes as just ResultSet, etc. java_import java.sql.ResultSet, java.sql.PreparedStatement, java.sql.Driver end