MySQL实现一条sql完成批量数据更新

原始功能：

• update categories SET display_order= 3,title = 'New Title 1' where id=1;

• update categories SET display_order= 4,title = 'New Title 2' where id=2;

• update categories SET display_order= 5,title = 'New Title 3' where id=3;

功能改进：

UPDATE categories SET    display_order = CASE id        WHEN 1 THEN 3        WHEN 2 THEN 4        WHEN 3 THEN 5    END,    title = CASE id        WHEN 1 THEN 'New Title 1'        WHEN 2 THEN 'New Title 2'        WHEN 3 THEN 'New Title 3'    ENDWHERE id IN (1,2,3)

PHP自动生成sql

$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],];例如，我们想让parent_id为100、title为A的记录依据不同id批量更新：/** * 批量更新函数 * @param $tableName 表名 * @param $data array 待更新的数据，二维数组格式 * @param array $params array 值相同的条件，键值对应的一维数组 * @param string $field string 值不同的条件，默认为id * @return bool|string */function batchUpdate($tableName,$data, $field, $params = []){   if (!is_array($data) || !$field || !is_array($params)) {      return false;   }    $updates = parseUpdate($data, $field);    $where = parseParams($params);    // 获取所有键名为$field列的值，值两边加上单引号，保存在$fields数组中    // array_column()函数需要PHP5.5.0+，如果小于这个版本，可以自己实现，    // 参考地址：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", $tableName, $updates, $field, $fields, $where);   return $sql;}/** * 将二维数组转换成CASE WHEN THEN的批量更新条件 * @param $data array 二维数组 * @param $field string 列名 * @return string sql语句 */function parseUpdate($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条件 * @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) : '';}

调用:

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

生成sql

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'

参考文章：

PHP批量更新