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Did you try SQL::Statement? It includes an SQL-parser:
use SQL::Statement; use Data::Dumper; my $sql = " SELECT * from foo where bar > 1923 "; my $parser = SQL::Parser->new(); my $stmt = SQL::Statement->new($sql,$parser); printf "Command %s\n",$stmt->command; printf "Columns %s\n",join',',map{$_->name} $stmt->column +s; printf "Tables %s\n",join',',map{$_->name} $stmt->tables +; print "Where operator\n",Dumper($stmt->where);
Result:
Command SELECT Columns * Tables FOO Where operator $VAR1 = bless( { 'arg2' => '1923', 'arg1' => bless( { 'table' => 'FOO', 'name' => 'BAR' }, 'SQL::Statement::Column' ), 'neg' => 0, 'op' => '>' }, 'SQL::Statement::Op' );
Working with the parse tree seems much easier and less error-prone than using your regex-solution.

The $stmt->where structure is a tree-structure with the arg-leaves either being a string or an object. If it is not an object, then it is trivialy easy to run it through Regexp::Common and Regexp::Common::number to check its "numberness" and what kind of number (decimal, octal, hex, ...)

CountZero

A program should be light and agile, its subroutines connected like a string of pearls. The spirit and intent of the program should be retained throughout. There should be neither too little or too much, neither needless loops nor useless variables, neither lack of structure nor overwhelming rigidity." - The Tao of Programming, 4.1 - Geoffrey James


In reply to Re: In search of an efficient query abstractor by CountZero
in thread In search of an efficient query abstractor by xaprb

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