Question

抱歉我的英文。我的数据库里有桌子：

CREATE TABLE `export_raw_categories` (
  `category_id` int(11) NOT NULL,
  `category_name` varchar(128) CHARACTER SET utf8 COLLATE utf8_bin DEFAULT NULL ,
  `parent_category_id` int(11) DEFAULT NULL ,
  `parent_category_name` varchar(128) CHARACTER SET utf8 COLLATE utf8_bin DEFAULT NULL ,
  `profile_name` varchar(128) DEFAULT NULL 
) ENGINE=InnoDB DEFAULT CHARSET=utf8 ROW_FORMAT=COMPACT;

我在PHP中有一个数组：

Array
(
[0] => Array
    (
        [0] => AFirst
        [1] => ASecond
        [2] => AThird
        [3] => AFourth
        [4] => AFifth
    )

[1] => Array
    (
        [0] => BFirst
        [1] => BSecond
        [2] => BThird
        [3] => BFourth
    )

[2] => Array
    (
        [0] => BFirst
        [1] => BSixth
    )

)

例如：

带键0的数组是分类树，如：AFirst\ASecond\AThird\AFourth\AFifth

因此AFirst是parent_category_name为NULL

的根类别

ASecond是包含parent_category_name AFirst

的类别

AThird是包含parent_category_name ASecond

的类别

等等。

我的问题是如何在数据库中分配正确的parent_category_id？

以下是PHP（Codeigniter）中的代码，但不能给我带来好结果：

foreach ($d as $key => $val) {
        foreach ($val as $sub_key => $sub_val) {

            $root_cat = array(
                'profile_name' => 'XYZ',
                'category_name' => $val[0],
                'parent_category_name' => null,
                'root_category' => null
            );

            $query = $this->db->get_where('export_raw_categories', $root_cat);
            if ($query->num_rows() == 0) {
                $this->db->insert('export_raw_categories', $root_cat);
                $root_id = $this->db->insert_id();
            } else if ($query->num_rows() == 1) {
                $root_id = $query->row('category_id');
            }

            if (isset($val[$sub_key - 1])) {

                $category_name = $sub_val;
                $parent_category_name = $val[$sub_key - 1];
                $root_cat = $val[0];

                $category = array(
                    'profile_name' => 'XYZ',
                    'category_name' => $sub_val,
                    'parent_category_name' => $parent_category_name,
                    'parent_category_id' => $root_id,
                    'root_category' => $parent_category_name . "\\" . $category_name
                );


                $query = $this->db->get_where('export_raw_categories', $category);
                if ($query->num_rows() == 0) {
                    $this->db->insert('export_raw_categories', $category);
                }
            }
        }
    }

更新

这有效：

foreach ($arr as $key => $categories) {
        $parent = NULL;
        foreach ($categories as $key_cat => $cat) {

            $category = array(
                'profile_name' => 'XYZ',
                'category_name' => $cat,
                'parent_category_name' => isset($categories[$key_cat - 1]) ? $categories[$key_cat - 1] : null,
                'parent_category_id' => $parent
                // 'root_category' => $parent_category_name . "\\" . $category_name
            );

            $query = $this->db->get_where('export_raw_categories', $category);
            if ($query->num_rows() == 0) {
                $this->db->insert('export_raw_categories', $category);
                $parent = $this->db->insert_id();
            } else if ($query->num_rows() == 1) {
                $parent = $query->row('category_id');
            }
        }
    }

感谢@Rok D.正确方向的输入。那么我现在应该支持你的答案还是接受它？

Answer 1

你可以这样做（只显示逻辑而不是确切的语法，因为你显然可以编写自己的SQL查询。

foreach ($arr as $categories) {
    $existingRoot = $this->db->query(); // SELECT category_id... WHERE category_name = $categories[0] 
    // If only roots can appear as 1st item then add AND parent_category_id = 0 
    $parent = $existingRoot ? $existingRoot->category_id : 0;
    foreach ($categories as $cat) {
        if ($cat == $existingRoot->category_name) {
            continue;
        }
        $this->db->insert();
        $parent = $this->db->insert_id();
    }
}

Answer 2

我将它拆分为2个函数 - 一个迭代基础数组 - 另一个负责数据处理。

这样的事情应该有效

public function tree()
{
    $d = [
        [
            'AFirst', 'ASecond', 'AThird', 'AFourth', 'AFifth'
        ],
        [
            'BFirst', 'BSecond',  'BThird', 'BFourth'
        ],
        [
            'BFirst', 'BSixth'
        ]
    ];
    foreach($d AS $arrData)
    {
        $this->insert($arrData);
    }
}

function insert($arrData, $arrParentData = null)
{

    if (is_array($arrData) && count($arrData) > 0)
    {
        $strData = array_shift($arrData);

        $arrDbData = [
            'category_name' => $strData,
        ];

        if ($arrParentData)
        {
            $arrDbData = array_merge($arrDbData, $arrParentData);
        }
        $this->db->insert('export_raw_categories', $arrDbData);
        $parentId = $this->db->insert_id();

        $arrParentData = [
            'parent_category_name' => $strData,
            'parent_category_id' => $parentId
        ];

        $this->insert($arrData, $arrParentData);

    }
}

PHP MYSQL插入类别树

2 个答案: