#Mysql 中文全文索引 案例

配置数据库连接的基本信息

在FindFullText.class.php类中：

   'mysql:host=localhost;dbname=blog;charset=utf8';
    $usr = 'root';
    $pwd = '123456';
    $this->db = new PDO($dsn, $usr, $pwd);

数据库建表：

data_text:

      CREATE TABLE `data_text` (
      `uuid` char(255) DEFAULT NULL,
      `id` int(11) unsigned NOT NULL AUTO_INCREMENT,
      `title` varchar(255) DEFAULT NULL,
      `body` longtext,
      `author` varchar(255) DEFAULT NULL,
      `time` datetime DEFAULT NULL,
      PRIMARY KEY (`id`)
    ) ENGINE=InnoDB AUTO_INCREMENT=39 DEFAULT CHARSET=utf8;

index_text:

    CREATE TABLE `index_text` (
      `uuid` varchar(255) DEFAULT NULL,
      `id` int(10) unsigned NOT NULL AUTO_INCREMENT,
      `title` varchar(200) DEFAULT NULL,
      `body` longtext,
      PRIMARY KEY (`id`),
      FULLTEXT KEY `title` (`title`,`body`)
    ) ENGINE=MyISAM AUTO_INCREMENT=33 DEFAULT CHARSET=utf8;

FindFullText.class.php类中方法介绍：

get_fenci()//获取文章段落的中文分词结果

//这里调用分词类
public function get_fenci($teststr)
{
    //PhpAnalysis::$loadInit = false;
    $pa = new PhpAnalysis('utf-8', 'utf-8', true);
    //执行分词
    $pa->SetSource($teststr);
    //多元切分
    $pa->differMax = true;
    //新词识别
    $pa->unitWord = true;
    //歧义处理
    $pa->StartAnalysis(true);
    //输出结果
    return $pa->GetFinallyResult(' ', false);
}    

get_uuid()//获取唯一UUID

public function get_uuid($prefix = '')
{
    $chars = md5(uniqid(mt_rand(), true));
    $uuid = substr($chars, 0, 8);
    $uuid .= substr($chars, 8, 4);
    $uuid .= substr($chars, 12, 4);
    $uuid .= substr($chars, 16, 4);
    $uuid .= substr($chars, 20, 12);
    return $prefix . $uuid;
}

add($title,$body)//向数据库添加信息，传入文章标题和文章内容

public function add($title, $body)
{
    $author = 'root';
    $uuid = $this->get_uuid();
    $today = date("Y-m-d H:i:s");
    $sql = 'INSERT INTO data_text ' . '(uuid,title, body, author, time) ' . 'values ' . "('$uuid','$title', '$body', '$author', '$today')";
    //echo $sql;
    $this->db->exec($sql);
    $index_title = $this->get_fenci($title);
    $index_body = $this->get_fenci($body);
    $sql_index = 'INSERT INTO index_text ' . '(uuid,title, body) ' . 'values ' . "('$uuid','$index_title', '$index_body')";
    $count = $this->db->exec($sql_index);
    return $count;
}

search($word)//全文检索功能，传入要搜索的关键字

public function search($word)
{
    $word = $this->get_fenci($word);
    $sql = "SELECT A.title, A.body,A.id, author, time 
       FROM data_text as A,index_text as B 
       WHERE A.uuid = B.uuid
    AND MATCH (B.title, B.body) AGAINST ('".$word."')";
    $sth = $this->db->query($sql);
    $result = $sth->fetchALL(PDO::FETCH_ASSOC);
    return $result;
}