PHP 批量更新的處理方法

<?php

/**
 * 批量更新函數
 * @param $data array 待更新的數據，二維數組格式
 * @param array $params array 值相同的條件，鍵值對應的一維數組
 * @param string $field string 值不一樣的條件，默認爲id
 * @return bool|string
 */
function batchUpdate($data, $field, $params = [])
{
   if (!is_array($data) || !$field || !is_array($params)) {
      return false;
   }

    $updates = parseUpdate($data, $field);
    $where = parseParams($params);

    // 獲取全部鍵名爲$field列的值，值兩邊加上單引號，保存在$fields數組中
    // array_column()函數須要PHP5.5.0+，若是小於這個版本，能夠本身實現，
    // 參考地址：http://php.net/manual/zh/function.array-column.php#118831
    $fields = array_column($data, $field);
    $fields = implode(',', array_map(function($value) {
        return "'".$value."'";
    }, $fields));

    $sql = sprintf("UPDATE `%s` SET %s WHERE `%s` IN (%s) %s", 'post', $updates, $field, $fields, $where);

   return $sql;
}

/**
 * 將二維數組轉換成CASE WHEN THEN的批量更新條件
 * @param $data array 二維數組
 * @param $field string 列名
 * @return string sql語句
 */
function parseUpdate($data, $field)
{
    $sql = '';
    $keys = array_keys(current($data));
    foreach ($keys as $column) {

        $sql .= sprintf("`%s` = CASE `%s` \n", $column, $field);
        foreach ($data as $line) {
            $sql .= sprintf("WHEN '%s' THEN '%s' \n", $line[$field], $line[$column]);
        }
        $sql .= "END,";
    }

    return rtrim($sql, ',');
}

/**
 * 解析where條件
 * @param $params
 * @return array|string
 */
function parseParams($params)
{
   $where = [];
   foreach ($params as $key => $value) {
      $where[] = sprintf("`%s` = '%s'", $key, $value);
   }
   
   return $where ? ' AND ' . implode(' AND ', $where) : '';
}


// $data = [
//     ['id' => 1, 'parent_id' => 100, 'title' => 'A', 'sort' => 1],
//     ['id' => 2, 'parent_id' => 100, 'title' => 'A', 'sort' => 3],
//     ['id' => 3, 'parent_id' => 100, 'title' => 'A', 'sort' => 5],
//     ['id' => 4, 'parent_id' => 100, 'title' => 'B', 'sort' => 7],
//     ['id' => 5, 'parent_id' => 101, 'title' => 'A', 'sort' => 9],
// ];

// echo batchUpdate($data, 'id', ['parent_id' => 100, 'title' => 'A']);
// 


獲得語句：
UPDATE `post` SET `id` = CASE `id` 
WHEN '1' THEN '1' 
WHEN '2' THEN '2' 
WHEN '3' THEN '3' 
WHEN '4' THEN '4' 
WHEN '5' THEN '5' 
END,`parent_id` = CASE `id` 
WHEN '1' THEN '100' 
WHEN '2' THEN '100' 
WHEN '3' THEN '100' 
WHEN '4' THEN '100' 
WHEN '5' THEN '101' 
END,`title` = CASE `id` 
WHEN '1' THEN 'A' 
WHEN '2' THEN 'A' 
WHEN '3' THEN 'A' 
WHEN '4' THEN 'B' 
WHEN '5' THEN 'A' 
END,`sort` = CASE `id` 
WHEN '1' THEN '1' 
WHEN '2' THEN '3' 
WHEN '3' THEN '5' 
WHEN '4' THEN '7' 
WHEN '5' THEN '9' 
END WHERE `id` IN ('1','2','3','4','5')  AND `parent_id` = '100' AND `title` = 'A'


$data = [
    ['mg_id' => 1, 'mg_addtime' => 1],
    ['mg_id' => 2, 'mg_addtime' => 3],
    ['mg_id' => 3, 'mg_addtime' => 5],
];
echo batchUpdate($data, 'mg_id');

獲得語句：
UPDATE `post` SET `id` = CASE `id` 
WHEN '1' THEN '1' 
WHEN '2' THEN '2' 
WHEN '3' THEN '3' 
END,`sort` = CASE `id` 
WHEN '1' THEN '1' 
WHEN '2' THEN '3' 
WHEN '3' THEN '5' 
END WHERE `id` IN ('1','2','3')