e0cc49ce39
* Merge the two debug() calls in attemptQuery() into one single call which checks DBO_DEBUG. This avoids pointless SPI logger overhead. * Avoid calling generalizeSQL() unless actually necessary. This works via a lazy-loading object. * Make lastQuery() a bit more consistent in terms of when it gets updated. * Add DBQueryDisconnectedError class for dropped connections. * Clean up visbility and names of last query/error fields. Change-Id: Ie8df3434d23b18f7a0f4c056d71388192cc52c6b
95 lines
2.7 KiB
PHP
95 lines
2.7 KiB
PHP
<?php
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/**
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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* http://www.gnu.org/copyleft/gpl.html
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*
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* @file
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* @ingroup Profiler
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*/
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namespace Wikimedia\Rdbms;
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/**
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* Lazy-loaded wrapper for simplification and scrubbing of SQL queries for profiling
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*
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* @since 1.34
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*/
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class GeneralizedSql {
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/** @var string */
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private $rawSql;
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/** @var string */
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private $trxId;
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/** @var string */
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private $prefix;
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/** @var string|null */
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private $genericSql;
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/**
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* @param string $rawSql
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* @param string $trxId
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* @param string $prefix
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*/
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public function __construct( $rawSql, $trxId, $prefix ) {
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$this->rawSql = $rawSql;
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$this->trxId = $trxId;
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$this->prefix = $prefix;
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}
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/**
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* Removes most variables from an SQL query and replaces them with X or N for numbers.
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* It's only slightly flawed. Don't use for anything important.
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*
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* @param string $sql A SQL Query
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*
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* @return string
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*/
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private static function generalizeSQL( $sql ) {
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# This does the same as the regexp below would do, but in such a way
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# as to avoid crashing php on some large strings.
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# $sql = preg_replace( "/'([^\\\\']|\\\\.)*'|\"([^\\\\\"]|\\\\.)*\"/", "'X'", $sql );
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$sql = str_replace( "\\\\", '', $sql );
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$sql = str_replace( "\\'", '', $sql );
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$sql = str_replace( "\\\"", '', $sql );
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$sql = preg_replace( "/'.*'/s", "'X'", $sql );
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$sql = preg_replace( '/".*"/s', "'X'", $sql );
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# All newlines, tabs, etc replaced by single space
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$sql = preg_replace( '/\s+/', ' ', $sql );
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# All numbers => N,
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# except the ones surrounded by characters, e.g. l10n
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$sql = preg_replace( '/-?\d+(,-?\d+)+/s', 'N,...,N', $sql );
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$sql = preg_replace( '/(?<![a-zA-Z])-?\d+(?![a-zA-Z])/s', 'N', $sql );
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return $sql;
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}
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/**
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* @return string
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*/
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public function stringify() {
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if ( $this->genericSql !== null ) {
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return $this->genericSql;
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}
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$this->genericSql = $this->prefix .
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substr( self::generalizeSQL( $this->rawSql ), 0, 255 ) .
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( $this->trxId ? " [TRX#{$this->trxId}]" : "" );
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return $this->genericSql;
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}
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}
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