Question

当我向我的数据库添加新类别时，它插入正常。但是，添加或删除

问题：添加新类别或删除类别后，如何确保codeigniter数据库缓存查询更新正确

$db['default'] = array(
    'dsn'   => '',
    'hostname' => 'localhost',
    'username' => 'root',
    'password' => '',
    'database' => 'community',
    'dbdriver' => 'mysqli',
    'dbprefix' => '',
    'pconnect' => FALSE,
    'db_debug' => (ENVIRONMENT !== 'production'),
    'cache_on' => TRUE,
    'cachedir' => APPPATH . 'cache/database/',
    'char_set' => 'utf8',
    'dbcollat' => 'utf8_general_ci',
    'swap_pre' => '',
    'encrypt' => FALSE,
    'compress' => FALSE,
    'stricton' => FALSE,
    'failover' => array(),
    'save_queries' => TRUE
);

论坛模型

public function getcategories() {
    $this->db->cache_on(); // Cache On

    $query = $this->db->select('*')
            ->order_by('name', 'asc')
            ->from('forum')
            ->get();

    if ($query->num_rows() > 0) {
        return $query->result_array();
    } else {
        return array();
    }
}

public function add() {
    $this->db->trans_start();
    $this->db->trans_strict(FALSE);

    $insert = array(
        'name' => $this->input->post('title'),
        'type' => $this->input->post('type'),
        'pid' => $this->input->post('pid')
    );

    $this->db->insert($this->db->dbprefix . 'forum', $insert);

    $this->db->trans_complete();
    if ($this->db->trans_status() === FALSE) {
        $this->db->trans_rollback();
        return FALSE;
    } else {
        $this->db->trans_commit();
        return TRUE;
    }
}

public function categories_for_deletion($fid) {
    $this->db->where('fid', $fid);
    $this->db->or_where('pid', $fid);

    $query = $this->db->delete('forum');

    $this->db->cache_delete('admin', 'category');
    if ($query) {
        return TRUE;
    } else {
        return FALSE;
    }
}

控制器

<?php

class Category extends MX_Controller {

    public function __construct() {
        parent::__construct();
        $this->load->library('form_validation');
        $this->load->library('forum');
        $this->load->model('admin/forum/forum_model');
    }

    public function add() {     
        $this->form_validation->set_rules('title', 'title', 'required');

        if ($this->form_validation->run() == TRUE) {

            $this->forum_model->add();

            redirect('admin/category');

        }

        $data['header'] = Modules::run('admin/common/header/index');
        $data['footer'] = Modules::run('admin/common/footer/index');

        $data['categories'] = $this->forum->generate_select();

        $this->load->view('template/forums/category_add_view', $data);
    }

    public function edit($fid) {        
        $this->form_validation->set_rules('title', 'title', 'required');

        if ($this->form_validation->run() == TRUE) {

        }

        $data['header'] = Modules::run('admin/common/header/index');
        $data['footer'] = Modules::run('admin/common/footer/index');

        $this->load->view('template/forums/category_edit_view', $data);
    }

    public function delete($fid) {
        $delete = $this->forum_model->categories_for_deletion($fid);

        if ($delete == TRUE) {
            redirect('admin/category');
        }


        $this->index();
    }

    public function index() {
        $data['categories'] = '';

        if ($this->forum_model->getcategories()) {
            $data['categories'] = $this->forum->set_categories_list($this->forum_model->getcategories());
        }

        $data['header'] = Modules::run('admin/common/header/index');
        $data['navbar'] = Modules::run('admin/common/navbar/index');
        $data['footer'] = Modules::run('admin/common/footer/index');

        $this->load->view('template/forums/category_view', $data);
    }
}

Answer 1

正如kishor10d所述，查询既不会自动更新，也不会自动过期或在任何持续时间后过期。你必须手动完成它，但它不需要cron工作或任何东西。 Codeigniter有一个方法。

每次更新后，您都必须执行

$this->db->cache_delete('controller', 'method');

如果未传递任何参数，则使用当前URI删除关联的缓存。查询完成后，将再次添加缓存，从而产生更新效果。

Codeigniter数据库查询缓存不使用新数据或删除数据进行更新

1 个答案: