Readjson
(since EVL 1.2)
Parse <f_in>
into <evd>
.
In general not all input fields need to exist in the input JSON, but if they are, then the option ‘--all-fields-exist’ will speed up the processing.
When the input JSON has not the same order of fields as defined in <evd>
, then option
‘--match-fields’ has to be used.
Usually when reading JSON file written by ‘Writejson’, it is good to call ‘Readjson’ with
option ‘-a’, as there are always all fields from <evd>
.
- Readjson
-
is to be used in EVS job structure definition file.
<f_out>
is either output file or flow name. - evl readjson
-
is intended for standalone usage, i.e. to be invoked from command line and and write to standard output.
EVD and EVS are EVL definition files, for details see evl-evd(5) and evl-evs(5).
Synopsis
Readjson <f_in> <f_out> (<evd>|-d <inline_evd>) [-a|--all-fields-exist] [-m|--match-fields] [-y|--text-output] evl readjson (<evd>|-d <inline_evd>) [--all-fields-exist] [--match-fields] [-y|--text-output] [--verbose] evl readjson ( --help | --usage | --version )
Options
- -d, --data-definition=<inline_evd>
-
either this option or the file <evd> must be presented. Example: -d ’user_sum long’
- -a, --all-fields-exist
-
when the input contain all fields (e.g. output of evl-writejson), then using this option increase the performance
- -m, --match-fields
-
when field are not in the same order as used in evd, this option must be used
- -y, --text-output
-
write the output as text, not binary
Standard options:
- --help
-
print this help and exit
- --usage
-
print short usage information and exit
- -v, --verbose
-
print to stderr info/debug messages of the component
- --version
-
print version and exit
In general not all input fields need to exist in the input JSON, but if they are, then the option "–all-fields-exist" will speed up the processing.
When the input JSON has not the same order of fields as defined in "EVD" file, then option "–match-fields" has to be used.
Usually when reading file written by "EVL" component ‘Writejson’, it is good to call "Readjson" with option "-a", as there are always all fields from "EVD".