DBI的Forward Slash问题

Question

我是新手在perl脚本中使用DBI进行SQL查询.我遇到的问题与具有正斜杠的字段中的数据有关.我想使用变量作为我的where子句的输入,但它正在做DBI打算使用正斜杠来做的事情:停止查询.我试过很多不同的工作,从绑定,引用等,但没有一个工作,甚至可能吗？这方面的数据是一致的.带有my $ sql变量的行就是问题所在.

#!/usr/bin/perl

# Modules
use DBI;
use DBD::Oracle;
use strict;
use warnings;

# Connection Info
$platform = "Oracle";
$database = "mydb";
$user = "user";
$pw = "pass";

# Data Source
$ds = "dbi:Oracle:$database";

my $dbh = DBI->connect($ds, $user, $pw);

# my $dbh = DBI->connect();       
my $XCOD = $dbh->quote('cba');
my $a = $dbh->quote('abc');
my $b = $dbh->quote('123');
# tried this as well  my $pid = $dbh->quote('$a/$b');
my $sql = "SELECT P_ID FROM MyTable WHERE P_ID=$a/$b AND XCOD=$XCOD";
my $sth = $dbh->prepare($sql);
$sth->execute(); 

my $outfile = 'superunique.txt';
open OUTFILE, '>', $outfile or die "Unable to open $outfile: $!";

while(my @re = $sth->fetchrow_array) {
print OUTFILE @re,"\n";
}

close OUTFILE;

$sth->finish();
$dbh->disconnect();

Answer 1

我不喜欢看到人们在SQL查询中使用变量插值.尝试使用占位符:

 [ snip ]
 my $P_ID = "$a/$b"
 my $sql = "SELECT P_ID FROM MyTable WHERE P_ID = ? AND XCOD = ?";
 my $sth = $dbh->prepare($sql);
 $sth->execute($P_ID, $XCOD); 
 [ snip ]