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Database: Add support for `LIKE`-escaped tables in `::get_table_from_query()`. 

The `SHOW TABLES LIKE` query can be used to search for tables that match a pattern, `wp\_123\_%`, for example. While this isn't the name of an actual table, the `wp_123_` prefix can be used by database drop-ins to direct the query correctly. This change removes the escaping and `%` modifier, to provide this usable prefix.

Props andy, pento.
Fixes #38751.


Built from https://develop.svn.wordpress.org/trunk@39275


git-svn-id: http://core.svn.wordpress.org/trunk@39215 1a063a9b-81f0-0310-95a4-ce76da25c4cd
This commit is contained in:
Gary Pendergast 2016-11-17 04:21:31 +00:00
parent bd11f7b84a
commit 7329283f7e
2 changed files with 13 additions and 7 deletions
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2
wp-includes/version.php
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@ -4,7 +4,7 @@
*
* @global string $wp_version
*/
$wp_version = '4.7-beta4-39274';
$wp_version = '4.7-beta4-39275';
/**
* Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.

18
wp-includes/wp-db.php
View File

@ -3037,12 +3037,18 @@ class wpdb {
return str_replace( '`', '', $maybe[1] );
}
// SHOW TABLE STATUS and SHOW TABLES
if ( preg_match( '/^\s*(?:'
. 'SHOW\s+TABLE\s+STATUS.+(?:LIKE\s+|WHERE\s+Name\s*=\s*)'
. '|SHOW\s+(?:FULL\s+)?TABLES.+(?:LIKE\s+|WHERE\s+Name\s*=\s*)'
. ')\W((?:[0-9a-zA-Z$_.`-]|[\xC2-\xDF][\x80-\xBF])+)\W/is', $query, $maybe ) ) {
return str_replace( '`', '', $maybe[1] );
// SHOW TABLE STATUS and SHOW TABLES WHERE Name = 'wp_posts'
if ( preg_match( '/^\s*SHOW\s+(?:TABLE\s+STATUS|(?:FULL\s+)?TABLES).+WHERE\s+Name\s*=\s*("|\')((?:[0-9a-zA-Z$_.-]|[\xC2-\xDF][\x80-\xBF])+)\\1/is', $query, $maybe ) ) {
return $maybe[2];
}
// SHOW TABLE STATUS LIKE and SHOW TABLES LIKE 'wp\_123\_%'
// This quoted LIKE operand seldom holds a full table name.
// It is usually a pattern for matching a prefix so we just
// strip the trailing % and unescape the _ to get 'wp_123_'
// which drop-ins can use for routing these SQL statements.
if ( preg_match( '/^\s*SHOW\s+(?:TABLE\s+STATUS|(?:FULL\s+)?TABLES)\s+(?:WHERE\s+Name\s+)?LIKE\s*("|\')((?:[\\\\0-9a-zA-Z$_.-]|[\xC2-\xDF][\x80-\xBF])+)%?\\1/is', $query, $maybe ) ) {
return str_replace( '\\_', '_', $maybe[2] );
}
// Big pattern for the rest of the table-related queries.