Override SQL to retrieve the schema info version number.

Methods
Public Class methods
new(connection)
      # File kirbybase_adapter.rb, line 1164
1164:     def initialize(connection)
1165:       @connection = connection
1166:       @types = @connection.native_database_types
1167:       @info = @connection.get_table(:schema_info).select[0] rescue nil
1168:     end
new(connection)
     # File test/ar_base_tests_runner.rb, line 403
403:     def initialize(connection)
404:       @connection = connection
405:       @types = @connection.native_database_types
406:       @info = @connection.get_table(:schema_info).select[0] rescue nil
407:     end