ADOdb

Database Abstraction Layer for PHP

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v5:session:session_index [2016/05/16 02:17] – mnewnhamv5:session:session_index [2023/03/27 13:14] – [MySQL or PDO MySQL] explain reason for using binary collation dregad
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 +====== Session Management ======
 <WRAP right box> <WRAP right box>
 [[v5:session:Index]]\\ [[v5:session:Index]]\\
-[[v5:session:reference:index|Session Command Reference]]\+[[v5:session:reference:index|Session Command Reference]]\\
 </WRAP> </WRAP>
-====== Session Management ======+
 ===== Introduction ===== ===== Introduction =====
 ADOdb session management extends the standard functionality of PHP sessions, by allowing the normal session data seen to be stored in a database itself. There are numerous ways that this method enhances the default behavior ADOdb session management extends the standard functionality of PHP sessions, by allowing the normal session data seen to be stored in a database itself. There are numerous ways that this method enhances the default behavior
  
-  * Simplified clean-up at end =of session life+  * Simplified clean-up at end of session life
   * Easy analysis of session data   * Easy analysis of session data
   * Simple session termination   * Simple session termination
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 An alternative to using a database backed session handler is to use [[v5:userguide:memcached]]. This is a distributed memory based caching system suitable for storing session information. An alternative to using a database backed session handler is to use [[v5:userguide:memcached]]. This is a distributed memory based caching system suitable for storing session information.
  
 +<WRAP important>
 +The original session management routines that use ''adodb-session.inc.php'' are deprecated as of ADOdb version 5.20, and will be removed in ADOdb Version 6.0.0. For information on upgrading from the original version, see [[v5:session:version1|Here]]
 +</WRAP>
 +
 +
 +===== Driver Support =====
 +The following drivers are known to work with the adodb-session2.php file:
 +  - mysqli
 +  - pdo_mysqli (From ADOdb version 5.21)
 +  - postgres
 +  - oci8
 +
 +This is not an exhaustive list, if you are using the system with a different database, let us know so we can add it to the list.
  
 ===== Usage ===== ===== Usage =====
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 ADOdb_Session::config($driver, $host, $user, $password, $database, $options=false); ADOdb_Session::config($driver, $host, $user, $password, $database, $options=false);
-ADOdb_session::Persist($connectMode=false);+ADOdb_Session::persist($connectMode=false);
 session_start(); session_start();
  
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 </code> </code>
  
-The parameter to the ''persist( )'' method sets the connection mode. You can pass the following: 
  
-^$connectMode^Connection Method^ 
-^true|PConnect()| 
-^false|Connect()| 
-^'N'|NConnect()| 
-^'P'|PConnect()| 
-^'C'|Connect()| 
-<WRAP important> 
-The original session management routines that use ''adodb-session.inc.php'' are deprecated as of ADOdb version 5.20, and will be removed in ADOdb Version 6.0.0. For information on upgrading from the original version, see [[v5:session:version1|Here]] 
-</WRAP> 
 ===== Using Encrypted Sessions ===== ===== Using Encrypted Sessions =====
 To use a encrypted sessions, replace the file ''adodb-session2.php'' with ''adodb-cryptsession2.php'': To use a encrypted sessions, replace the file ''adodb-session2.php'' with ''adodb-cryptsession2.php'':
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 ADOdb_Session::config($driver, $host, $user, $password, $database,$options=false); ADOdb_Session::config($driver, $host, $user, $password, $database,$options=false);
-adodb_sess_open(false,false,$connectMode=false); 
 session_start(); session_start();
 </code> </code>
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 ADOdb_Session::config($driver, $host, $user, $password, $database,$options=false); ADOdb_Session::config($driver, $host, $user, $password, $database,$options=false);
-adodb_sess_open(false,false,$connectMode=false); 
 session_start(); session_start();
 </code> </code>
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 Create this table in your database.  Create this table in your database. 
  
-==== MySQL ==== +==== MySQL or PDO MySQL ==== 
-   + 
-  CREATE TABLE sessions2( +<code> 
-   sesskey VARCHAR( 64 ) NOT NULL DEFAULT '', +CREATE TABLE sessions2 ( 
-     expiry DATETIME NOT NULL , +  sesskey VARCHAR( 64 ) COLLATE utf8mb4_bin NOT NULL DEFAULT '', 
-   expireref VARCHAR( 250 ) DEFAULT '', +  expiry DATETIME NOT NULL , 
-   created DATETIME NOT NULL , +  expireref VARCHAR( 250 ) DEFAULT '', 
-   modified DATETIME NOT NULL , +  created DATETIME NOT NULL , 
-   sessdata LONGTEXT, +  modified DATETIME NOT NULL , 
-   PRIMARY KEY ( sesskey ) , +  sessdata LONGTEXT, 
-   INDEX sess2_expiry( expiry ), +  PRIMARY KEY ( sesskey ) , 
-   INDEX sess2_expireref( expireref ) +  INDEX sess2_expiry( expiry ), 
-  )+  INDEX sess2_expireref( expireref ) 
 +) 
 +</code> 
 + 
 +<WRAP info> 
 +When [[https://www.php.net/manual/en/session.configuration.php#ini.session.sid-bits-per-character|session.sid_bits_per_character]] php.ini setting is set to 6, the //Session ID// can contain both upper and lowercase letters.  
 +Collisions could occur in this case, due to MySQL performing case-insensitive searches by default.  
 +To avoid that, the //sesskey// column should use binary (or a case-sensitive) collation. 
 +</WRAP> 
  
 ==== PostgreSQL ==== ==== PostgreSQL ====
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  $user = $ADODB_SESS_CONN->qstr($expireref);  $user = $ADODB_SESS_CONN->qstr($expireref);
  
- $ADODB_SESS_CONN->Execute("delete from shopping_cart where user=$user");+ $ADODB_SESS_CONN->execute("delete from shopping_cart where user=$user");
  system("rm /work/tmpfiles/$expireref/*");  system("rm /work/tmpfiles/$expireref/*");
 } }
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 will compress and then encrypt the record in the database. will compress and then encrypt the record in the database.
  
-===== Session Cookie Regeneration ===== 
  
-The method ''adodb_session_regenerate_id()'' will dynamically change the current session id with a newly generated one and update database. This currently only works with cookies. Useful to improve security by reducing the risk of session-hijacking. See this article on Session Fixation for more info on the theory behind this feature.  
  
-==== Usage ==== 
- 
-<code php> 
-include 'adodb/adodb-session2.php'; 
- 
-session_start(); 
-/* 
-* Approximately every 10 page loads, reset cookie for safety. 
-* This is extremely simplistic example, better 
-* to regenerate only when the user logs in or changes 
-* user privilege levels. 
-*/ 
-if ((rand()%10) == 0)  
-    adodb_session_regenerate_id(); 
-</code> 
- 
-This function calls ''session_regenerate_id()'' internally or simulates it if the function does not exist. 
- 
-===== Vacuum/Optimize Database ===== 
- 
-During session garbage collection, if postgresql is detected, ADOdb can be set to run VACUUM. If mysql is detected, then optimize database could be called.You can turn this on or off using: 
-<code php> 
-$turnOn = true; # or false 
-ADODB_Session::optimize($turnOn); 
-</code> 
-The default is optimization is disabled. 
  
-===== Backwards Compatability =====+===== Backwards Compatibility =====
  
 The older method of connecting to ADOdb using global variables is now deprecated, and **will be removed** in ADOdb version 6.0: The older method of connecting to ADOdb using global variables is now deprecated, and **will be removed** in ADOdb version 6.0:
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 $ADODB_SESSION_USER ='root'; $ADODB_SESSION_USER ='root';
 $ADODB_SESSION_PWD ='abc'; $ADODB_SESSION_PWD ='abc';
-$ADODB_SESSION_DB ='phplens';+$ADODB_SESSION_DB ='employees';
  
 include 'adodb/adodb-session.php'; include 'adodb/adodb-session.php';
v5/session/session_index.txt · Last modified: 2023/04/08 18:08 by dregad