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[nextgen-gallery] Fix identifiers quoted as strings

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MySQL allows quoting identifiers, such as column names, as strings using
single-quotes in addition to quoting as identifiers using grave accents.
PostgreSQL does not, resulting in errors such as:

Error running :
SELECT DISTINCT wp_ngg_pictures.* , GROUP_CONCAT(CONCAT_WS('@@', meta_key, meta_value)) AS 'extras' FROM `wp_ngg_pictures` LEFT OUTER JOIN `wp_postmeta` ON `wp_postmeta`.`post_id` = `extras_post_id`  GROUP BY wp_ngg_pictures.pid LIMIT 1
---- converted to ----
SELECT DISTINCT wp_ngg_pictures.* , GROUP_CONCAT(CONCAT_WS('@@', meta_key, meta_value)) AS 'extras' FROM wp_ngg_pictures LEFT OUTER JOIN wp_postmeta ON wp_postmeta.post_id = extras_post_id  GROUP BY wp_ngg_pictures.pid LIMIT 1
----> ERROR:  syntax error at or near "'extras'"
LINE 1: ..._CONCAT(CONCAT_WS('@@', meta_key, meta_value)) AS 'extras' F...
                                                             ^

Fix this by replacing single quotes with grave accents when they occur
after ") AS ".  This strategy obviously has both false-positive and
false-negative issues, but suits the current needs and should be
relatively safe from false-positives.  Proper replacement would require
parsing the SQL.

Signed-off-by: Kevin Locke <kevin@kevinlocke.name>
This commit is contained in:
Kevin Locke
2015-06-06 20:44:12 -06:00
parent 49e598f300
commit 785307ee95
1 changed files with 5 additions and 0 deletions
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5
pg4wp/driver_pgsql.php
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@ -292,6 +292,11 @@
if( false !== strpos( $sql, $wpdb->comments))
$sql = str_replace(' comment_id ', ' comment_ID ', $sql);
// MySQL supports strings as names, PostgreSQL needs identifiers.
// Limit to after closing parenthesis to reduce false-positives
// Currently only an issue for nextgen-gallery plugin
$pattern = '/\) AS \'([^\'])\'/';
$sql = preg_replace( $pattern, ') AS "$1"', $sql);
} // SELECT
elseif( 0 === strpos($sql, 'UPDATE'))
{