Question

以下查询让我感到惊讶并没有失败，但插入了一条记录。

INSERT INTO buy_contacts(buys_id,contacts_id,buy_status,sites_id,record_status,date_modified,date_created)
VALUES(863999180,1367026068,"buy",2675631760,"active",NOW(),NOW());

SELECT查询将其显示为已插入。

+-----------+-------------+-------+-----------------+-----------------+---------------+------------+------------+---------------+----------------+
|  buys_id  | contacts_id | notes |  date_modified  |  date_created   | record_status |  sites_id  | buy_status | created_by_id | modified_by_id |
+-----------+-------------+-------+-----------------+-----------------+---------------+------------+------------+---------------+----------------+
| 863999180 |  1367026068 | NULL  | 1/10/2015 10:31 | 1/10/2015 10:31 | active        | 2675631760 | buy        |             0 |              0 |
+-----------+-------------+-------+-----------------+-----------------+---------------+------------+------------+---------------+----------------+

我的表模式（由MySQL Workbench创建）如下所示。如图所示，created_by_id和modified_by_id都是NOT NULL，没有DEFAULT值，插入记录的查询不包含这些列。

为什么MySQL没有因为NOT NULL约束而拒绝查询，为什么它为这些列插入零值？

SET @OLD_UNIQUE_CHECKS=@@UNIQUE_CHECKS, UNIQUE_CHECKS=0;
SET @OLD_FOREIGN_KEY_CHECKS=@@FOREIGN_KEY_CHECKS, FOREIGN_KEY_CHECKS=0;
SET @OLD_SQL_MODE=@@SQL_MODE, SQL_MODE='TRADITIONAL,ALLOW_INVALID_DATES';

// other tables are created...

CREATE TABLE IF NOT EXISTS `buy_contacts` (
  `buys_id` INT UNSIGNED NOT NULL,
  `contacts_id` INT UNSIGNED NOT NULL,
  `notes` TEXT NULL,
  `date_modified` DATETIME NOT NULL,
  `date_created` DATETIME NOT NULL,
  `record_status` VARCHAR(8) NOT NULL,
  `sites_id` INT UNSIGNED NOT NULL,
  `buy_status` CHAR(3) NOT NULL,
  `created_by_id` INT UNSIGNED NOT NULL,
  `modified_by_id` INT UNSIGNED NOT NULL,
  PRIMARY KEY (`buys_id`, `contacts_id`),
  INDEX `fk_buys_has_contacts_contacts1_idx` (`contacts_id` ASC),
  INDEX `fk_buys_has_contacts_buys1_idx` (`buys_id` ASC),
  INDEX `fk_buy_contacts_record_status2_idx` (`record_status` ASC),
  INDEX `fk_buy_contacts_sites2_idx` (`sites_id` ASC),
  INDEX `fk_buy_contacts_buy_status1_idx` (`buy_status` ASC),
  INDEX `fk_buy_contacts_users1_idx` (`created_by_id` ASC),
  INDEX `fk_buy_contacts_users2_idx` (`modified_by_id` ASC),
  CONSTRAINT `fk_buys_has_contacts_buys1`
    FOREIGN KEY (`buys_id`)
    REFERENCES `buys` (`id`)
    ON DELETE NO ACTION
    ON UPDATE NO ACTION,
  CONSTRAINT `fk_buys_has_contacts_contacts1`
    FOREIGN KEY (`contacts_id`)
    REFERENCES `contacts` (`id`)
    ON DELETE NO ACTION
    ON UPDATE NO ACTION,
  CONSTRAINT `fk_buy_contacts_record_status2`
    FOREIGN KEY (`record_status`)
    REFERENCES `record_status` (`id`)
    ON DELETE NO ACTION
    ON UPDATE NO ACTION,
  CONSTRAINT `fk_buy_contacts_sites2`
    FOREIGN KEY (`sites_id`)
    REFERENCES `sites` (`id`)
    ON DELETE NO ACTION
    ON UPDATE NO ACTION,
  CONSTRAINT `fk_buy_contacts_buy_status1`
    FOREIGN KEY (`buy_status`)
    REFERENCES `buy_status` (`id`)
    ON DELETE NO ACTION
    ON UPDATE NO ACTION,
  CONSTRAINT `fk_buy_contacts_users1`
    FOREIGN KEY (`created_by_id`)
    REFERENCES `users` (`id`)
    ON DELETE NO ACTION
    ON UPDATE NO ACTION,
  CONSTRAINT `fk_buy_contacts_users2`
    FOREIGN KEY (`modified_by_id`)
    REFERENCES `users` (`id`)
    ON DELETE NO ACTION
    ON UPDATE NO ACTION)
ENGINE = InnoDB;

Answer 1

检查是否已启用STRICT_ALL_TABLES模式并安装了5.6版。

默认情况下，MySQL使用过时的＆＃34;容忍＆＃34;模式，非事务存储引擎（MyISAM）需要。

是什么导致MySQL不强制执行NOT NULL约束？

1 个答案: