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a09d919ce8
This commit implements GH-8967.
SQLite supports multiple transaction modes. These include:
- DEFERRED (default) only acquires a lock when you start a read/write
- IMMEDIATE acquires a reserved lock
- EXCLUSIVE acquires an exclusive lock (stricter than immediate)
In WAL mode IMMEDIATE and EXCLUSIVE are identical.
One reason for wanting to specify a transaction mode is that SQLite
doesn't respect busy_timeout when a DEFERRED transaction tries to
upgrade a read lock to a write lock. Normally if you try to acquire a
lock and have busy_timeout configured, SQLite will wait for that period
until giving up and erroring out (SQLITE_BUSY). With DEFERRED, if you
have a transaction that first reads and there's a concurrent writer
while it's trying to upgrade to a write lock, you will immediately get
SQLITE_BUSY regardless of your busy_timeout.
Prior to this commit, the only available workarounds were:
- Using $pdo->exec("BEGIN IMMEDIATE TRANSACTION") instead of
$pdo->beginTransaction()
- Doing a dummy write at the start of each transaction so you don't get
stuck with a read lock
Both of those aren't very usable, especially in a framework context
where the user doesn't have complete control over how transactions are
started.
To address that, this commit adds four class constants to Pdo\Sqlite:
- ATTR_TRANSACTION_MODE -- a new attribute
- TRANSACTION_MODE_DEFERRED = 0
- TRANSACTION_MODE_IMMEDIATE = 1
- TRANSACTION_MODE_EXCLUSIVE = 2
These can be used as:
$pdo->setAttribute(
$pdo::ATTR_TRANSACTION_MODE,
$pdo::TRANSACTION_MODE_IMMEDIATE
);
43 lines
1.6 KiB
C
43 lines
1.6 KiB
C
/*
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+----------------------------------------------------------------------+
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| Copyright (c) The PHP Group |
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+----------------------------------------------------------------------+
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| This source file is subject to version 3.01 of the PHP license, |
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| that is bundled with this package in the file LICENSE, and is |
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| available through the world-wide-web at the following url: |
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| https://www.php.net/license/3_01.txt |
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| If you did not receive a copy of the PHP license and are unable to |
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| obtain it through the world-wide-web, please send a note to |
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| license@php.net so we can mail you a copy immediately. |
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+----------------------------------------------------------------------+
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| Author: Wez Furlong <wez@php.net> |
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+----------------------------------------------------------------------+
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*/
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#ifndef PHP_PDO_SQLITE_H
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#define PHP_PDO_SQLITE_H
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extern zend_module_entry pdo_sqlite_module_entry;
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#define phpext_pdo_sqlite_ptr &pdo_sqlite_module_entry
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#include "php_version.h"
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#define PHP_PDO_SQLITE_VERSION PHP_VERSION
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#ifdef ZTS
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#include "TSRM.h"
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#endif
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enum pdo_sqlite_transaction_mode {
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PDO_SQLITE_TRANSACTION_MODE_DEFERRED = 0,
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PDO_SQLITE_TRANSACTION_MODE_IMMEDIATE = 1,
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PDO_SQLITE_TRANSACTION_MODE_EXCLUSIVE = 2
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};
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PHP_MINIT_FUNCTION(pdo_sqlite);
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PHP_MSHUTDOWN_FUNCTION(pdo_sqlite);
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PHP_RINIT_FUNCTION(pdo_sqlite);
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PHP_RSHUTDOWN_FUNCTION(pdo_sqlite);
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PHP_MINFO_FUNCTION(pdo_sqlite);
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#endif /* PHP_PDO_SQLITE_H */
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