当column1 = value1和Column2 = value2时进行MySQL全文搜索

Question

我正在尝试用Full Text搜索Full Text ，其中
publisher -> example和author -> test ... 或
publisher -> example和auhtor -> test和bookname -> another ...

我试过这个查询：

    $this->_query  = "SELECT " . $targetCol . " FROM " . $this->_dbName . "." . $this->_tableName . " WHERE ";
    $this->_query .= "MATCH(publisher) AGAINST('" . $pub . "') AND ";
    $this->_query .= "MATCH(author) AGAINST('" . $aut . "') ";

但这没有正确的结果。
然后我在stackoverflow中进行搜索，发现了以下内容：

    $this->_query  = "SELECT " . $targetCol . " FROM " . $this->_dbName . "." . $this->_tableName . " WHERE ";
    $this->_query .= "MATCH(publisher, author) AGAINST('" . $pub . "', '" . $aut . "')";

但是这一结果也不正确。 publishre in my case看来，这些查询似乎集中在第一列publishre in my case

你能告诉我为什么吗？ 还是我的查询符合我的目标？

Thanks in advance