thinkphp/library/think/cache/driver/Sqlite.php

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<?php
// +----------------------------------------------------------------------
// | ThinkPHP [ WE CAN DO IT JUST THINK ]
// +----------------------------------------------------------------------
// | Copyright (c) 2006~2018 http://thinkphp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: liu21st <liu21st@gmail.com>
// +----------------------------------------------------------------------

namespace think\cache\driver;

use think\cache\Driver;

/**
 * Sqlite缓存驱动
 * @author    liu21st <liu21st@gmail.com>
 */
class Sqlite extends Driver
{
    protected $options = [
        'db'         => ':memory:',
        'table'      => 'sharedmemory',
        'prefix'     => '',
        'expire'     => 0,
        'persistent' => false,
    ];

    /**
     * 构造函数
     * @param array $options 缓存参数
     * @throws \BadFunctionCallException
     * @access public
     */
    public function __construct($options = [])
    {
        if (!extension_loaded('sqlite')) {
            throw new \BadFunctionCallException('not support: sqlite');
        }
        if (!empty($options)) {
            $this->options = array_merge($this->options, $options);
        }
        $func          = $this->options['persistent'] ? 'sqlite_popen' : 'sqlite_open';
        $this->handler = $func($this->options['db']);
    }

    /**
     * 获取实际的缓存标识
     * @access public
     * @param string $name 缓存名
     * @return string
     */
    protected function getCacheKey($name)
    {
        return $this->options['prefix'] . sqlite_escape_string($name);
    }

    /**
     * 判断缓存