Question

我有一个数据库表，我必须从

建立一个UL列表。

表格的设置如下猫咪 parent-id（是任何父代的cat-id）猫名猫图片

我可以很容易地获得父母ID为“ 0”的根猫但是对于我的一生，我不知道该怎么做，所以最终结果是

rootcat --childParent ---孩子

function cats(){
        $sql = "SELECT * FROM `cats";
        $cats;
        $con = mysqli_connect($this->vars["host"], $this->vars["user"], $this->vars["pass"], $this->vars["db"]);
        if(mysqli_connect_errno()){
            print "START MYSQLI ERROR<br/>".
            mysqli_connect_error() .
            "<br/>ENDMYSQLI ERROR";
        }else{
            $res = mysqli_query($con, $sql);
            if(mysqli_num_rows($res) > 0){
                while($cat = $res->fetch_array(MYSQLI_ASSOC)){
                    if($cat["parent-id"] == "0"){
                        $cats[] = $cat["cat-name"];
                    }
                }
            }
            mysqli_free_result($res);
            mysqli_close($con);
            return $cats;
        }

Answer 1

您可以像这样解析子类别，但是每次您检查父级具有哪些类别时，它都要求建立sql连接：

function cats(){
    $sql = "SELECT * FROM `cats";
    $cats;
    $con = mysqli_connect($this->vars["host"], $this->vars["user"], $this->vars["pass"], $this->vars["db"]);
    if(mysqli_connect_errno()){
        print "START MYSQLI ERROR<br/>".
        mysqli_connect_error() .
        "<br/>ENDMYSQLI ERROR";
    }else{
        $res = mysqli_query($con, $sql);
        if(mysqli_num_rows($res) > 0){
            while($cat = $res->fetch_array(MYSQLI_ASSOC)){
                if($cat["parent-id"] == "0"){
                    $cats[$key] = $cat["cat-name"];
                    $sql_subCategory = "SELECT * FROM cats where parent_id=". $cat["id"];
                            $res_sub = mysqli_query($con, $sql_subCategory);
                            if(mysqli_num_rows($res_sub) > 0){
                                while($cat_sub = $res_sub->fetch_array(MYSQLI_ASSOC)){
                                   $cats[$cat["cat-name"]] = $cat_sub["cat-name"];
                                }
                            }
                        }
                    }
                }
                mysqli_free_result($res_sub);
                mysqli_free_result($res);
                mysqli_close($con);
                return $cats;
            }

那应该给你数组：

array(
    'cat1' => 'Some Category',
    'cat2' => array(
        'sub1' => 'name',
    ),
);

Answer 2

这就是我的结论，它是完全递归的

    public function cats($id){      
    $con = mysqli_connect($this->vars["host"], $this->vars["user"], $this->vars["pass"], $this->vars["db"]);
    $cats;
    if(mysqli_connect_errno()){
        print "START MYSQLI ERROR<br/>".
        mysqli_connect_error() .
        "<br/>ENDMYSQLI ERROR";
    }else{
        $cats[] = $this->child($id, $con);
        mysqli_close($con);
        return $cats;
    }
}
function child($id,$con){
    $sql = "SELECT * FROM `cats` WHERE `parent-id`= '".$id."'";
//  print $sql ."<br/>";
    $res = mysqli_query($con, $sql);
        if(mysqli_num_rows($res) > 0){
            while($cat = $res->fetch_array(MYSQLI_ASSOC)){ 
                    $cats[]["cat-name"] = $cat["cat-name"];
                    $sql_subCat = "SELECT * FROM `cats` WHERE `parent-id` = '".$cat["cat-id"]."'";
                    $res_sub = mysqli_query($con, $sql_subCat);
                    if(mysqli_num_rows($res_sub) > 0){
                        while($cat_sub = $res_sub->fetch_array(MYSQLI_ASSOC)){
                            $cats[$cat["cat-name"]][] = $cat_sub["cat-name"] ;
                            $cats[$cat["cat-name"]]= $this->child($cat["cat-id"],$con);
                        }
                    }
                }

        }
        mysqli_free_result($res_sub);
        mysqli_free_result($res);
        return $cats;
}

递归数据库查询以建立ul列表

2 个答案: