Question

我最近在查询中添加了锁定以防止死锁。这个问题已经解决了，但是现在我遇到了一个问题，即插入到一个表中是否随机失败而没有原因。我

我已打开常规查询日志以查看到底发生了什么。有没有其他方法来调试这个以确切了解正在发生的事情或有任何原因的想法？

如果我执行以下锁定：

$this->db->query('LOCK TABLES '.$this->db->dbprefix('customers').' WRITE, '.$this->db->dbprefix('sales').' WRITE, 
'.$this->db->dbprefix('store_accounts').' WRITE, '.$this->db->dbprefix('sales_payments').' WRITE, '.$this->db->dbprefix('sales_items').' WRITE, 
'.$this->db->dbprefix('giftcards').' WRITE, '.$this->db->dbprefix('location_items').' WRITE, 
'.$this->db->dbprefix('inventory').' WRITE, '.$this->db->dbprefix('sales_items_taxes').' WRITE,
'.$this->db->dbprefix('sales_item_kits').' WRITE, '.$this->db->dbprefix('sales_item_kits_taxes').' WRITE,'.$this->db->dbprefix('people').' READ,'.$this->db->dbprefix('items').' READ
,'.$this->db->dbprefix('employees_locations').' READ,'.$this->db->dbprefix('locations').' READ, '.$this->db->dbprefix('items_tier_prices').' READ
, '.$this->db->dbprefix('location_items_tier_prices').' READ, '.$this->db->dbprefix('items_taxes').' READ, '.$this->db->dbprefix('item_kits').' READ
, '.$this->db->dbprefix('location_item_kits').' READ, '.$this->db->dbprefix('item_kit_items').' READ, '.$this->db->dbprefix('employees').' READ , '.$this->db->dbprefix('item_kits_tier_prices').' READ
, '.$this->db->dbprefix('location_item_kits_tier_prices').' READ, '.$this->db->dbprefix('location_items_taxes').' READ
, '.$this->db->dbprefix('location_item_kits_taxes'). ' READ, '.$this->db->dbprefix('item_kits_taxes'). ' READ');


    foreach($items as $line=>$item)
    {
        if (isset($item['item_id']))
        {
            $cur_item_info = $this->Item->get_info($item['item_id']);

            $sales_items_data = array
            (
                'sale_id'=>$sale_id,
                'item_id'=>$item['item_id'],
                'line'=>$item['line'],
                'description'=>$item['description'],
                'serialnumber'=>$item['serialnumber'],
                'quantity_purchased'=>$item['quantity'],
                'discount_percent'=>$item['discount'],
                'item_cost_price' => $cur_item_info->cost_price,
                'item_unit_price'=>$item['price']
            );

            $this->db->insert('sales_items',$sales_items_data);
        }
        ...
        ...
    }

$this->db->query('UNLOCK TABLES');

表：

+--------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| phppos_sales_items | CREATE TABLE `phppos_sales_items` (
  `sale_id` int(10) NOT NULL DEFAULT '0',
  `item_id` int(10) NOT NULL DEFAULT '0',
  `description` varchar(255) COLLATE utf8_unicode_ci DEFAULT NULL,
  `serialnumber` varchar(255) COLLATE utf8_unicode_ci DEFAULT NULL,
  `line` int(3) NOT NULL DEFAULT '0',
  `quantity_purchased` decimal(23,10) NOT NULL DEFAULT '0.0000000000',
  `item_cost_price` decimal(23,10) NOT NULL,
  `item_unit_price` decimal(23,10) NOT NULL,
  `discount_percent` int(11) NOT NULL DEFAULT '0',
  PRIMARY KEY (`sale_id`,`item_id`,`line`),
  KEY `item_id` (`item_id`),
  CONSTRAINT `phppos_sales_items_ibfk_1` FOREIGN KEY (`item_id`) REFERENCES `phppos_items` (`item_id`),
  CONSTRAINT `phppos_sales_items_ibfk_2` FOREIGN KEY (`sale_id`) REFERENCES `phppos_sales` (`sale_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci |
+--------------------+-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+

1 row in set (0.06 sec)

然后插入一堆表但随机我收到一个错误，其中数据没有进入sales_items，但使用item_id外键正确地使其进入其他表...是否存在可能导致插入的情况因锁而随意失败？我将打开常规查询日志以查看发生了什么，但我无法跟踪它。这种情况从未发生过，直到我添加锁定。

Answer 1

原来它与mysql 5.6默认严格模式设置有关。与锁无关

mysql锁定表导致某些插入随机失败

1 个答案: