php - 在 CodeIgniter 2.0 中返回并使用数据库中的多维记录数组

Question

嘿伙计们! 好吧，我正在尝试使用 codeigniter，但在我看来，我在尝试检索和显示表中的数据时造成了一些困惑 这是代码片段。

我想检索存储在我的文章表中的所有文章，同时我需要从关系表和分别名为articleTagRelation和标签的标签表中提取与每篇文章关联的所有标签

Table structure :

Article table      : articleID, articleContent, date
Tags table         : tagID, tagName
articleTagRelation : aricleID,tagID {Combination of both is my primary key}

CI model :

article_model.php

    public function getAllTags($postId){
        $this->db->select('articleTagRelation.tagId as tagId, articleTagRelation.postId as postId, article.tagName as tagName,');
        $this->db->from('articleTagRelation');
        $this->db->join('Tags','Tags.tagId = articleTagRelation.tagId');
        $this->db->where('ArticleTagRelation.articleId',$postId);
        $qTag = $this->db->get();
        if($qTag->num_rows() > 0){
            foreach ($qTag->result() as $tag) {
                return $tag;
            }
        }
    }

    public function getAllArticles(){
        $this->db->select('*');
        $this->db->from('Article');
        $this->db->order_by('date','desc');
        $query=$this->db->get();
        if($query->num_rows()>0){
            foreach ($query->result() as $row) {
                $data['row'] = $row;
                $data['articletags'] = $this->getAllTags($row->articleId); // I'm trying to get get a array of all the associate tags.
                                $post=array($data['row'],$data['articletags']);
            }       
        }else{
            echo 'nothing found !';
        }
        return $post;
    }

my controller file
article.php
I'm calling this function in the index function
    $data['rows'] = $this->blog_model->getAllArticles();
and then loading the view by passing the data array 

now the part where things get messy 
in my view 
  
 echo $r->articleId // works fine
 echo $r->articletags->tagId //gives me a error message


Can any one help me out in printing those tagIds

Answer 1

首先，您根本不需要 foreach 来获取标签信息，它会从 query_result 返回。

像这样...

if($qTag->num_rows() > 0){
    return $qTag->result();
}
else {
    return array();  //return empty array if no tags
}

然后要构建您的文章，请使用 getAllArticles()

public function getAllArticles(){

    // removed uneccessary select and from
    // the below accomplishes the same thing
    $this->db->order_by('date','desc');
    $query = $this->db->get('Article');

    if ( $query->num_rows() > 0 ) {

        // store the result in a variable you will end up returning
        $articles = $query->result();

        // make sure you foreach by reference so that changes you make
        // to the interated $article will be made to the actual article
        // result
        foreach ($articles as &$article) {

            // create a new property of your article "tags" and save an
            // array of tags in it
            $article->tags = $this->getAllTags( $article->articleId );
        }

    } else {
        echo 'nothing found !';
    }

    return $articles;
}

最后要注意的是，当您现在引用 $r->tags 时，它是一个数组，因此您可以 foreach 它来处理所有标签，或者引用类似 $r->tags[3]->tagId

的索引