将PHP的session数据存储到数据库中的代码实例

2020-03-22 19:27:32

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一个开发环境有多个网站，需要使用不同的session，解决方案很多。不过这次也高大上一把，用数据库存，方便以后扩展。PostgreSQL版
首先是数据库的部分--drop table php_sessioncreate unlogged table php_session sess_id varchar(32) primary key, modify_time timestamp with time zone not null, sess_data varchar(3000) default ''create index conhtml' target='_blank'>currently idx_php_session_modify_time on php_session(modify_time);--set_session(id, data)create or replace function set_session(varchar, varchar) returns void as $set_session$ with upsert as ( update php_session set modify_time = current_timestamp, sess_data = $2 where sess_id = $1 returning 1 insert into php_session (sess_id, modify_time, sess_data) select $1, current_timestamp, $2 where not exists ( select 1 from upsert$set_session$ language sql;--get_session(id)create or replace function get_session(varchar) returns varchar as $get_session$ select sess_data from php_session where sess_id = $1$get_session$ language sql;--del_sessioncreate or replace function del_session(varchar) returns void as $del_session$ delete from php_session where sess_id = $1$del_session$ language sql;--gc_sessioncreate or replace function gc_session() returns void as $del_session$ delete from php_session where modify_time current_timestamp - interval '30 days'$del_session$ language sql;然后是PHP的部分session_set_save_handler( function ($savePath, $sessionName) {//open return true; function () {//close return true; function ($id) {//read $sql = "select get_session($1)"; $stmt = pg_query_params(SESSION_CONN, $sql, array($id)); $result = pg_fetch_row($stmt); return $result[0]; function ($id, $data) {//write $sql = "select set_session($1, $2)"; pg_query_params(SESSION_CONN, $sql, array($id, $data)); return true; function ($id) {//destroy $sql = "select del_session($1)"; pg_query_params(SESSION_CONN, $sql, array($id, $data)); return true; function ($maxlifetime) {//gc //php needn't control the global session gc return true;register_shutdown_function('session_write_close');
然后只要在session_start之前调用这个就可以了至于SESSION_CONN，那是我定义的一个常量，表示一个指向session数据库的链接而已。MySQL版
再总结一个针对MySQL的集成更多基础功能的例子：
表结构：
CREATE TABLE IF NOT EXISTS `sessioninfo` ( `sid` varchar(255) NOT NULL, `value` text NOT NULL, `expiration` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP, PRIMARY KEY (`sid`) ) ENGINE=InnoDB DEFAULT CHARSET=utf8;session信息存储到数据库的类：
class MySessionHandler implements SessionHandlerInterface { * @access private * @var object 数据库连接 private $_dbLink; * @access private * @var string 保存session的表名 Private $_sessionTable; * @access private * @var string session名 private $_sessionName; * @const 过期时间 const SESSION_EXPIRE = 10; public function __construct($dbLink, $sessionTable) { if(!is_object($dbLink)) { return false; $this- _dbLink = $dbLink; $this- _sessionTable = $sessionTable; * 打开 * @access public * @param string $session_save_path 保存session的路径 * @param string $session_name session名 * @return integer public function open($session_save_path, $session_name) { $this- _sessionName = $session_name; return 0; * 关闭 * @access public * @return integer public function close() { return 0; * 关闭session * @access public * @param string $session_id session ID * @return string public function read($session_id) { $query = "SELECT value FROM {$this- _sessionTable} WHERE sid = {$session_id} AND UNIX_TIMESTAMP(expiration) + " . self::SESSION_EXPIRE . " UNIX_TIMESTAMP(NOW())"; $result = $this- _dbLink- query($query); if(!isset($value) || empty($value)) { $value = ""; return $value; $this- _dbLink- query("UPDATE {$this- _sessionTable} SET expiration = CURRENT_TIMESTAMP() WHERE sid = {$session_id}"); $value = $result- fetch_array(); $result- free(); return $value['value']; * 写入session * @access public * @param string $session_id session ID * @param string $session_data session data * @return integer public function write($session_id, $session_data) { $query = "SELECT value FROM {$this- _sessionTable} WHERE sid = '{$session_id}' AND UNIX_TIMESTAMP(expiration) + " . self::SESSION_EXPIRE . " UNIX_TIMESTAMP(NOW())"; $result = $this- _dbLink- query($query); $result = $result- fetch_array(); if(!empty($result)) { $result = $this- _dbLink- query("UPDATE {$this- _sessionTable} SET value = {$session_data} WHERE sid = {$session_id}"); else{ $result = $this- _dbLink- query("INSERT INTO {$this- _sessionTable} (sid, value) VALUES ('{$session_id}', '{$session_data}')"); if($result){ return 0; else{ return 1; * 销魂session * @access public * @param string $session_id session ID * @return integer public function destroy($session_id) { $result = $this- _dbLink- query("DELETE FROM {$this- _sessionTable} WHERE sid = '{$session_id}'"); if($result){ return 0; else{ return 1; * 垃圾回收 * @access public * @param string $maxlifetime session 最长生存时间 * @return integer public function gc($maxlifetime) { $result = $this- _dbLink- query("DELETE FROM {$this- _sessionTable} WHERE UNIX_TIMESTAMP(expiration) UNIX_TIMESTAMP(NOW()) - " . self::SESSION_EXPIRE); if($result){ return 0; else{ return 1;
$dbLink = new mysqli("localhost", "root", "root", "test");$sessionTable = "sessioninfo";$handler = new MySessionHandler($dbLink, $sessionTable);session_set_save_handler($handler);session_start();$_SESSION['name'] = "test";echo $_SESSION["name"];//session_destroy();PHP教程

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