- " level="2">搜索
- 环境配置
- 搜索页面入口?
- 如何主动更新索引?
- 如何根据输入的关键字获取索引结果?
" class="reference-link">搜索
环境配置
MySQL 5.6前,只有 MyISAM 引擎支持全文搜索,MySQL 5.6 InnoDB 也支持全文索引。
配置mysql.cnf
#mysql指定了最小字符长度,默认是4,必须要匹配大于4的才会有返回结果
ft_min_word_len = 2
字段是否加入全文搜索
搜索页面入口?
http://you_domain.com/index.php?g=Search
如何主动更新索引?
更新索引,更新需要检索字段的分词
$SearModel::search_api($id, $data, $modelid);
# data 为传入该行数据 ,由$modelid + $id 两条件筛选出来
如何根据输入的关键字获取索引结果?
思路:先把关键字分词,然后进行检索。
核心代码
//分词结果
if ($this->config['dzsegment']) {
//用discuz的分词接口,http调用,比较耗时
$segment_q = D('Search/Search')->discuzSegment($q);
} else {
//内置的分词方法
$segment_q = D('Search/Search')->segment($q);
}
if (!empty($segment_q[0]) && $this->config['segment']) {
$words = $segment_q;
$segment_q = implode(' ', $segment_q);
$where['_string'] = " MATCH (`data`) AGAINST ('{$segment_q}' IN BOOLEAN MODE) ";
} else {
//不推荐,性能差。若分词失败什么的,用最暴力的模糊查询
$likeList = explode(' ', $q);
if (count($likeList) > 1) {
foreach ($likeList as $k => $rs) {
$likeList[$k] = "%{$rs}%";
}
$where['data'] = array('like', $likeList, 'or');
} else {
$where['data'] = array('like', "%{$q}%");
}
$words = array($q);
}
//查询结果缓存
if ($cachetime) {
//统计
$count = M('Search')->where($where)->cache(true, $cachetime)->count();
$page = page($count, $pagesize);
$result = M('Search')->where($where)->cache(true, $cachetime)->limit($page->firstRow . ',' . $page->listRows)->order($order)->select();
} else {
$count = M('Search')->where($where)->count();
$page = page($count, $pagesize);
$result = M('Search')->where($where)->limit($page->firstRow . ',' . $page->listRows)->order($order)->select();
}