Problem with jdbc_streaming

Good morning,

please i have some quetions about jdbc_streaming , i made such a configuration to extract some data using jdbc_streaming but i didn't acheive to my goal .

there is my configuration file
jdbc_streaming {
jdbc_driver_library => ".............."
jdbc_driver_class => "................."
jdbc_connection_string => "............."
jdbc_user => "........"
jdbc_password => "........"
parameters => {"variable"=>"field2"}
statement => "SELECT field5 From database2 where field4 =:variable"

target => "code"
use_cache => "true"
cache_expiration => "5"
cache_size => "100"

}
when i run logstash on mode debug i have code=>[ field5=>"valueoffield5"]

but what i want is added code to first database with value directly not code=>[ field5=>"valueoffield5"]

Please need some help