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Top Forums Shell Programming and Scripting Using awk and grep for sql generation Post 302983928 by RudiC on Tuesday 18th of October 2016 01:24:08 PM
Old 10-18-2016
Code:
T[$1"."$2]=$3

This statement first concatenates the first and second field with a dot separator, then uses this string as an index for array T and assigns the third field's value to it. Reading all lines from "desc.txt":
Code:
Table|Field|Type
Employee|id|int
Contact|name|string
Contact|country|string
Contact|phone|bigint

would yield
Code:
T["Employee.id"] = "int"
T["Contact.name"] = "string"
T["Contact.country"] = "string"
T["Contact.phone"] = "bigint"

With the flds=split($2, F, ",") function and the "pk.txt2" file
Code:
TableName | PK
Employee | id
Contact|name,phone,country

,in the second line the T[$1"."F[i+1]] statement would loop across name,phone,country and reference
Code:
T["Contact.name"] = "string"
T["Contact.country"] = "string"
T["Contact.phone"] = "bigint"

to be able to select the output format.
This User Gave Thanks to RudiC For This Post:
 

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English(3pm)						 Perl Programmers Reference Guide					      English(3pm)

NAME
English - use nice English (or awk) names for ugly punctuation variables SYNOPSIS
use English; use English qw( -no_match_vars ) ; # Avoids regex performance penalty # in perl 5.16 and earlier ... if ($ERRNO =~ /denied/) { ... } DESCRIPTION
This module provides aliases for the built-in variables whose names no one seems to like to read. Variables with side-effects which get triggered just by accessing them (like $0) will still be affected. For those variables that have an awk version, both long and short English alternatives are provided. For example, the $/ variable can be referred to either $RS or $INPUT_RECORD_SEPARATOR if you are using the English module. See perlvar for a complete list of these. PERFORMANCE
NOTE: This was fixed in perl 5.20. Mentioning these three variables no longer makes a speed difference. This section still applies if your code is to run on perl 5.18 or earlier. This module can provoke sizeable inefficiencies for regular expressions, due to unfortunate implementation details. If performance matters in your application and you don't need $PREMATCH, $MATCH, or $POSTMATCH, try doing use English qw( -no_match_vars ) ; . It is especially important to do this in modules to avoid penalizing all applications which use them. perl v5.18.2 2014-01-06 English(3pm)
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