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无法实现MySQL+session
谢谢楼上的!
我已简单化了,而且也调试了,基本问题是出在数据库连接上,就是mysql_select_db()有问题,我也单独写了PHP网页测试,在一个连接中两次选取同一个数据库,返回结果是false,导致session的其它五个函数无法工作:原代码如下(摘自权威PHP论坛)
<?
/* ------------------------------------------------------------------------
* session_mysql.php
* ------------------------------------------------------------------------
* PHP4 MySQL Session Handler
* Version 1.00
* by Ying Zhang (ying@zippydesign.com)
* Last Modified: May 21 2000
*
* ------------------------------------------------------------------------
* TERMS OF USAGE:
* ------------------------------------------------------------------------
* You are free to use this library in any way you want, no warranties are
* expressed or implied. This works for me, but I don't guarantee that it
* works for you, USE AT YOUR OWN RISK.
*
* While not required to do so, I would appreciate it if you would retain
* this header information. If you make any modifications or improvements,
* please send them via email to Ying Zhang <ying@zippydesign.com>;.
*
* ------------------------------------------------------------------------
* DESCRIPTION:
* ------------------------------------------------------------------------
* This library tells the PHP4 session handler to write to a MySQL database
* instead of creating individual files for each session.
*
* Create a new database in MySQL called "sessions" like so:
*
* CREATE TABLE sessions (
* sesskey char(32) not null,
* expiry int(11) unsigned not null,
* value text not null,
* PRIMARY KEY (sesskey)
* );
*
* ------------------------------------------------------------------------
* INSTALLATION:
* ------------------------------------------------------------------------
* Make sure you have MySQL support compiled into PHP4. Then copy this
* script to a directory that is accessible by the rest of your PHP
* scripts.
* 确信你的php4有mysql支持,然后把这个脚本拷贝到和你的php脚本有关的目录。
* ------------------------------------------------------------------------
* USAGE:(使用方法)
* ------------------------------------------------------------------------
* Include this file in your scripts before you call session_start(), you
* don't have to do anything special after that.
* 包含这个文件到你要使用session的文件中,必须在调用session_start()之前,否则,
* 会很惨的,不要怪我没告诉你。 这样就不需要再做什么工作了,还和你以前用session的方法一样。
*/
$SESS_DBHOST = "localhost"; /* database server hostname */
$SESS_DBNAME = "sessions"; /* database name */
$SESS_DBUSER = "phpsession"; /* database user */
$SESS_DBPASS = "phpsession"; /* database password */
$SESS_DBH = "";
$SESS_LIFE = get_cfg_var("session.gc_maxlifetime" ;
function sess_open($save_path, $session_name) {
global $SESS_DBHOST, $SESS_DBNAME, $SESS_DBUSER, $SESS_DBPASS, $SESS_DBH;
if (! $SESS_DBH = mysql_pconnect($SESS_DBHOST, $SESS_DBUSER, $SESS_DBPASS)) {
echo "<li>;Can't connect to $SESS_DBHOST as $SESS_DBUSER";
echo "<li>;MySQL Error: ", mysql_error();
die;
}
if (! mysql_select_db($SESS_DBNAME, $SESS_DBH)) {
echo "<li>;Unable to select database $SESS_DBNAME";
die;
}
return true;
}
function sess_close() {
return true;
}
function sess_read($key) {
global $SESS_DBH, $SESS_LIFE;
$qry = "SELECT value FROM sessions WHERE sesskey = '$key' AND expiry >; " . time();
$qid = mysql_query($qry, $SESS_DBH);
if (list($value) = mysql_fetch_row($qid)) {
return $value;
}
return false;
}
function sess_write($key, $val) {
global $SESS_DBH, $SESS_LIFE;
$expiry = time() + $SESS_LIFE;
$value = addslashes($val);
$qry = "INSERT INTO sessions VALUES ('$key', $expiry, '$value')";
$qid = mysql_query($qry, $SESS_DBH);
if (! $qid) {
$qry = "UPDATE sessions SET expiry = $expiry, value = '$value' WHERE sesskey
= '$key' AND expiry >; " . time();
$qid = mysql_query($qry, $SESS_DBH);
}
return $qid;
}
function sess_destroy($key) {
global $SESS_DBH;
$qry = "DELETE FROM sessions WHERE sesskey = '$key'";
$qid = mysql_query($qry, $SESS_DBH);
return $qid;
}
function sess_gc($maxlifetime) {
global $SESS_DBH;
$qry = "DELETE FROM sessions WHERE expiry < " . time();
$qid = mysql_query($qry, $SESS_DBH);
return mysql_affected_rows($SESS_DBH);
}
session_set_save_handler(
"sess_open",
"sess_close",
"sess_read",
"sess_write",
"sess_destroy",
"sess_gc" ;
?>;
后来我尝试在每一个函数中用
$a=mysql_connect($host,$user,$pass)
$b=mysql_select($dbname,$a);
....
....
$c=mysql_close($a);
这样按道理来说,每一次PHP的session进入函数都应该重新打开数据库用完了还关闭了,应该没有错了,但是还是无法实现session到数据库。不知道哪位大侠做过session定制到mysql数据库。
(另,我按照PHP要求在php.ini中设置了session.save_handler=user)
不知道问题在哪(数据库一切正常,一直在用,files式的session也是正常)
等待高手,谢谢。 |
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