Method: Sequel::JDBC::Database#foreign_key_list

Defined in:
lib/sequel/adapters/jdbc.rb

#foreign_key_list(table, opts = OPTS) ⇒ Object

Use the JDBC metadata to get a list of foreign keys for the table.



304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
 
# File 'lib/sequel/adapters/jdbc.rb', line 304

def foreign_key_list(table, opts=OPTS)
  m = output_identifier_meth
  schema, table = metadata_schema_and_table(table, opts)
  foreign_keys = {}

  metadata(:getImportedKeys, nil, schema, table) do |r|
    next unless fk_name = r[:fk_name]

    key_seq = r[:key_seq]
    columns = [key_seq, m.call(r[:fkcolumn_name])]
    key = [key_seq, m.call(r[:pkcolumn_name])]

    if fk = foreign_keys[fk_name]
      fk[:columns] << columns
      fk[:key] << key
    else
      foreign_keys[fk_name] = {
        :name=>m.call(fk_name),
        :columns=>[columns],
        :table=>m.call(r[:pktable_name]),
        :key=>[key]
      }
    end
  end

  fk_keys = [:columns, :key]
  foreign_keys.values.each do |fk|
    fk_keys.each do |k|
      fk[k].sort!.map!{|_, v| v}
    end
  end
end