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WPDB: When sanity checking read queries, there are some collations we can skip, for improved performance.

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Props pento, nacin.

See #21212.


Built from https://develop.svn.wordpress.org/trunk@32162


git-svn-id: http://core.svn.wordpress.org/trunk@32137 1a063a9b-81f0-0310-95a4-ce76da25c4cd
This commit is contained in:
Gary Pendergast 2015-04-20 04:46:25 +00:00
parent 7f1b31f80f
commit 2bbd21f543
2 changed files with 69 additions and 1 deletions
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2
wp-includes/version.php
View File

@ -4,7 +4,7 @@
*
* @global string $wp_version
*/
$wp_version = '4.2-RC1-32161';
$wp_version = '4.2-RC1-32162';
/**
* Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.

68
wp-includes/wp-db.php
View File

@ -170,6 +170,16 @@ class wpdb {
*/
protected $check_current_query = true;
/**
* Flag to ensure we don't run into recursion problems when checking the collation.
*
* @since 4.2.0
* @access private
* @see wpdb::check_safe_collation()
* @var boolean
*/
private $checking_collation = false;
/**
* Saved info on the table column
*
@ -2038,6 +2048,10 @@ class wpdb {
public function get_var( $query = null, $x = 0, $y = 0 ) {
$this->func_call = "\$db->get_var(\"$query\", $x, $y)";
if ( $this->check_safe_collation( $query ) ) {
$this->check_current_query = false;
}
if ( $query ) {
$this->query( $query );
}
@ -2066,6 +2080,11 @@ class wpdb {
*/
public function get_row( $query = null, $output = OBJECT, $y = 0 ) {
$this->func_call = "\$db->get_row(\"$query\",$output,$y)";
if ( $this->check_safe_collation( $query ) ) {
$this->check_current_query = false;
}
if ( $query ) {
$this->query( $query );
} else {
@ -2103,6 +2122,10 @@ class wpdb {
* @return array Database query result. Array indexed from 0 by SQL result row number.
*/
public function get_col( $query = null , $x = 0 ) {
if ( $this->check_safe_collation( $query ) ) {
$this->check_current_query = false;
}
if ( $query ) {
$this->query( $query );
}
@ -2131,6 +2154,10 @@ class wpdb {
public function get_results( $query = null, $output = OBJECT ) {
$this->func_call = "\$db->get_results(\"$query\", $output)";
if ( $this->check_safe_collation( $query ) ) {
$this->check_current_query = false;
}
if ( $query ) {
$this->query( $query );
} else {
@ -2358,6 +2385,47 @@ class wpdb {
return false;
}
/**
* Check if the query is accessing a collation considered safe on the current version of MySQL.
*
* @since 4.2.0
* @access protected
*
* @param string $query The query to check.
* @return bool True if the collation is safe, false if it isn't.
*/
protected function check_safe_collation( $query ) {
if ( $this->checking_collation ) {
return true;
}
$table = $this->get_table_from_query( $query );
if ( ! $table ) {
return false;
}
$this->checking_collation = true;
$this->get_table_charset( $table );
$this->checking_collation = false;
$table = strtolower( $table );
if ( empty( $this->col_meta[ $table ] ) ) {
return false;
}
foreach( $this->col_meta[ $table ] as $col ) {
if ( empty( $col->Collation ) ) {
continue;
}
if ( ! in_array( $col->Collation, array( 'utf8_general_ci', 'utf8_bin', 'utf8mb4_general_ci', 'utf8mb4_bin' ), true ) ) {
return false;
}
}
return true;
}
/**
* Strips any invalid characters based on value/charset pairs.
*