Question

我在插入之前有一个触发器，用新的插入ID替换字段的字符串。这包装在一个条件中，并且在满足条件时效果很好。但是，当尝试执行普通插入操作且字符串不存在时，触发器将完全停止执行插入操作，但是触发器中没有执行此操作的任何线索，为什么会发生这种情况？在下面触发：

DELIMITER $$

DROP TRIGGER /*!50032 IF EXISTS */ `delivery_management_vehicle_placeholder_title`$$

CREATE
/*!50017 DEFINER = 'root'@'localhost' */
TRIGGER `delivery_management_vehicle_placeholder_title` BEFORE INSERT ON `delivery_management_vehicle` 
FOR EACH ROW BEGIN
    DECLARE id_delivery_management_vehicle INT DEFAULT 0;
    DECLARE mask VARCHAR(10) DEFAULT '--id--';
    IF LOCATE(mask, NEW.`title`) > 0 THEN
       SELECT 
           `auto_increment` INTO id_delivery_management_vehicle
       FROM
           `information_schema`.`tables`
       WHERE 
           `table_name` = 'delivery_management_vehicle'
       AND 
           `table_schema` = DATABASE();

       SET NEW.`title`=REPLACE(NEW.`title`, mask, id_delivery_management_vehicle);
   END IF;
 END;
$$

DELIMITER ;

表结构如下：

CREATE TABLE `delivery_management_vehicle` (
  `id_dmv` int(11) unsigned NOT NULL AUTO_INCREMENT,
  `id_system_user` int(11) NOT NULL,
  `id_organisation` int(11) NOT NULL DEFAULT '0',
  `id_depth1` int(11) NOT NULL DEFAULT '0',
  `id_depth2` int(11) NOT NULL DEFAULT '0',
  `id_type` int(11) NOT NULL DEFAULT '1',
  `id_approver` int(11) NOT NULL DEFAULT '0',
  `id_author` int(11) NOT NULL DEFAULT '0',
  `id_owner` int(11) NOT NULL DEFAULT '0',
  `id_responsible` int(11) NOT NULL DEFAULT '0',
  `id_administrator` int(11) NOT NULL DEFAULT '0',
  `id_category` int(11) NOT NULL DEFAULT '1',
  `title` varchar(255) NOT NULL,
  `description` text NOT NULL,
  `keywords` text NOT NULL,
  `colour` char(6) DEFAULT NULL,
  `scope` text NOT NULL,
  `assumptions` text NOT NULL,
  `objectives` text NOT NULL,
  `reference` varchar(255) NOT NULL,
  `source` varchar(255) NOT NULL DEFAULT '',
  `created` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,
  `last_updated` datetime NOT NULL,
  `last_updated_by` int(11) NOT NULL,
  `approved` enum('0','1') NOT NULL DEFAULT '0',
  `priority` enum('undefined','low','medium','high','critical') NOT NULL DEFAULT 'undefined',
  `approved_date` datetime NOT NULL,
  `actual_start_date` date NOT NULL,
  `planned_start_date` date NOT NULL,
  `projected_start_date` date NOT NULL,
  `planned_completion_date` date NOT NULL,
  `projected_completion_date` date NOT NULL,
  `actual_completion_date` date NOT NULL,
  `tolerance` int(11) NOT NULL,
  `tolerance_period` enum('days','weeks','months') NOT NULL,
  `planned_implementation` bigint(19) DEFAULT NULL,
  `planned_management` bigint(19) DEFAULT NULL,
  `planned_budget` bigint(19) DEFAULT NULL,
  `projected_management` bigint(19) DEFAULT NULL,
  `projected_budget` bigint(19) DEFAULT NULL,
  `actual_implementation` bigint(19) DEFAULT NULL,
  `actual_management` bigint(19) DEFAULT NULL,
  `actual_budget` bigint(19) DEFAULT NULL,
  `financial_summary_tolerance` int(11) DEFAULT '0',
  `use_rag` enum('D','R','A','G','B') NOT NULL DEFAULT 'D',
  `mandatory` enum('0','1') NOT NULL DEFAULT '0',
  `active` enum('0','1') NOT NULL DEFAULT '1',
   PRIMARY KEY (`id_dmv`),
  KEY `id_system_user` (`id_system_user`),
  KEY `id_type` (`id_type`),
  KEY `id_approver` (`id_approver`),
  KEY `id_author` (`id_author`),
  KEY `id_owner` (`id_owner`),
  KEY `id_responsible` (`id_responsible`),
  KEY `id_administrator` (`id_administrator`),
  KEY `id_system_user_2` (`id_system_user`,`active`),
  KEY `id_author_2` (`id_author`,`active`),
  KEY `id_owner_2` (`id_owner`,`active`),
  KEY `id_approver_2` (`id_approver`,`active`),
  KEY `id_responsible_2` (`id_responsible`,`active`),
  KEY `id_type_2` (`id_type`,`active`)
) ENGINE=MyISAM AUTO_INCREMENT=15 DEFAULT CHARSET=utf8 COMMENT='Delivery Management Vehicle';

我要执行的插入语句是：

INSERT INTO `delivery_management_vehicle` (
  `last_updated`,
  `title`,
  `reference`,
  `description`,
  `keywords`,
  `source`,
  `priority`,
  `scope`,
  `assumptions`,
  `objectives`,
  `use_rag`,
  `id_category`,
  `id_type`,
  `id_organisation`,
  `id_depth1`,
  `id_depth2`,
  `colour`,
  `id_system_user`,
  `actual_start_date`,
  `planned_start_date`,
  `projected_start_date`,
  `planned_completion_date`,
  `projected_completion_date`,
  `tolerance`,
  `tolerance_period`,
  `last_updated_by`
) VALUES (
NOW(),'G Test 3','','','','','undefined','','','','D',1,1,0,0,0,NULL,'3','','','','','',0,'days','3');

抱歉，表声明很大，但是插入仅用于某些列。

因此，我希望查看标题字段，因为它在标题字段中不存在字符串“ --id--”，所以触发器将被跳过。

欢呼

Answer 1

您正在尝试将IntPtr buffer = Marshal.AllocHGlobal(1024); int ret = recv_message2(this.client, buffer, 1024, timeout); if (ret > 0) { byte[] myByteArray = new byte[ret]; Marshal.Copy(buffer, myByteArray, 0, ret); return Encoding.UTF8.GetString(myByteArray); }插入''列中。你不能那样做。

如果不满足条件，MySQL触发器将阻止INSERT

1 个答案: