update:add skip locked func

src/Mysql/Medoo.php

@@ -1459,6 +1459,55 @@ class Medoo
 		return $result;
 	}
 
+	public function selectForUpdateSkipLocked($table, $columns = null, $where = null, $options = null)
+	{
+		$map = [];
+		$result = [];
+		$column_map = [];
+
+		$index = 0;
+
+		$column = $columns;
+
+		$is_single = (is_string($column) && $column !== '*');
+
+		$query = $this->exec($this->selectContext($table, $map, $columns, $where, null, $options) . ' FOR UPDATE SKIP LOCKED ', $map);
+
+		$this->columnMap($columns, $column_map, true);
+
+		if (!$this->statement)
+		{
+			return false;
+		}
+
+		if ($columns === '*')
+		{
+			return $query->fetchAll(PDO::FETCH_ASSOC);
+		}
+
+		while ($data = $query->fetch(PDO::FETCH_ASSOC))
+		{
+			$current_stack = [];
+
+			$this->dataMap($data, $columns, $column_map, $current_stack, true, $result);
+		}
+
+		if ($is_single)
+		{
+			$single_result = [];
+			$result_key = $column_map[ $column ][ 0 ];
+
+			foreach ($result as $item)
+			{
+				$single_result[] = $item[ $result_key ];
+			}
+
+			return $single_result;
+		}
+
+		return $result;
+	}
+
 	public function insert($table, $datas)
 	{
 		$stack = [];

src/Mysql/MysqlBase.php

@@ -37,6 +37,7 @@ use Api\PhpUtils\Log\FileLog;
  * @method static MysqlBase select($columns, $where, $options)
  * @method static MysqlBase selectMaster($columns, $where, $options)
  * @method static MysqlBase selectForUpdate($columns, $where, $options)
+ *  * @method static MysqlBase selectForUpdateSkipLocked($columns, $where, $options)
  * @method static MysqlBase getMaster($columns, $where, $options)
  * @method static MysqlBase get($columns, $where, $options)
  * @method static MysqlBase count($columns, $where)
@@ -105,6 +106,7 @@ abstract class MysqlBase
         "selectMaster", // 或使用/*master*/强制路由，对主从实时性要求较高的场景使用，分布式系统尽量用消息代替查主库等其他方案
         "getMaster",
         "selectForUpdate",
+        "selectForUpdateSkipLocked",
         "insertDuplicate",
     ];