CI framework database query cache optimization method_php example

The example in this article describes the CI framework database query cache optimization method. Share it with everyone for your reference, the details are as follows:

There is a better query optimization in the CI framework, which is database cache optimization

1. Turn on cache

//在application/config.php中开启
$db['default']['cache_on'] = TRUE;
//在application/config.php中开启
$db['default']['cachedir'] = './cache';
//并在对应的目录中加一个可写缓存目录cache

2. Enable cache statements in the corresponding query

// 打开缓存开关
$this->db->cache_on();
$query = $this->db->query("SELECT * FROM mytable");
// 使下面这条查询不被缓存
$this->db->cache_off();
$query = $this->db->query("SELECT * FROM members WHERE member_id = '$current_user'");
// Turn caching back on
$this->db->cache_on();
$query = $this->db->query("SELECT * FROM another_table");

3. Add corresponding clear cache

//缓存不会自动删除 只能手动删除
//这样 你可以在对应的 增改删 语句中清除缓存 就ok了
//清空所有缓存
$this->db->cache_delete_all()
/*
清空单个缓存
example.com/index.php/blog/comments的页面, 缓存系统会把所有生成的缓存文件放进
一个以 blog+comments做为名称的文件夹里. 如果您要删除关于刚才提到的这个例子与
之对应的缓存文件 需要执行以下代码:
*/
$this->db->cache_delete('/blog', 'comments');

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