# File lib/sqlite3/driver/dl/driver.rb, line 140 def trace( db, data=nil, &block ) @trace_handler = block unless @trace_handler_callback @trace_handler_callback = ::DL.callback( "IPS" ) do |cookie,sql| @trace_handler.call( cookie ? cookie.to_object : nil, sql ) || 0 end end API.sqlite3_trace( db, block&&@trace_handler_callback, data ) end