Question

MWE：

#!/usr/bin/perl

use strict;
use warnings;
use SQL::Maker;

our $builder = SQL::Maker->new(
    driver => 'mysql',
);

my @fields = (
    ['ABS(field)'  => 'VAT'],
);

my ($sql, @bind) = $builder->select("test", \@fields);
print $sql;

输出：

SELECT `ABS(field)` AS `VAT`
FROM `test`

我如何获得：

SELECT ABS(`field`) AS `VAT`
FROM `test`

？

Answer 1

以下内容可能有效或无效，quote_char有时可以省略，但是引入的风险由您自己评估：

our $builder = SQL::Maker->new(
    driver => 'MySQL',
    quote_char => '',
);

及以后

my @fields = (
    ['ABS(`field`)'  => 'VAT'],
);

这给出了：

SELECT ABS(`field`) AS VAT
FROM test

Answer 2

为了获得逐字代码，我们需要引用字段名称：

my @fields = (
    [\'ABS(field)'  => 'VAT'],
);

输出：

SELECT ABS(field) AS `VAT`
FROM `test`

SQL :: Maker如何向字段添加功能

2 个答案: