How to let CodeIgniter database cache automatically expire_PHP tutorial

The CodeIgniter framework is a very small PHP framework. CI comes with a database file cache, but according to the official statement, the cache will never expire after being set unless you call a method to actively delete it.

Cache files DO NOT expire. Any queries that have been cached will remain cached until you delete them.

It feels too retarded and very inconvenient. Modify the db class, set an expiration time when caching is enabled, and the cache will automatically expire when it expires.

1: Replace the cache_on function in line 1021 of CI database/DB_dirver.php with

Copy code The code is as follows:

function cache_on($expire_time=0) //add parm expire time - cache expiration time
{
$this->cache_expire_time = $expire_time; //add by kenvin
$this-> ;cache_on = TRUE;
return TRUE;
}

2: CI database/DB_cache.php line 90 read function if (FALSE === ($cachedata = read_file($ filepath))) Add

in front of a line. Copy the code . The code is as follows:

//Determine whether it is expired// cache_expire_time
if ( !file_exists($filepath) ) {
return false;
}
if ( $this->db->cache_expire_time > 0 && filemtime($filepath) db->cache_expire_time ) {
return false;
}

In this way, where the cache needs to be enabled, the previous $this→db→cache_on(); is changed to

Copy code The code is as follows:

$this→db→cache_on($SEC);

$SEC is the cache expiration time, in seconds unit. For example, $this→db→cache_on(60); means that the cache will expire after 60 seconds.

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