Question

我有两张桌子

websites

contain feilds
(SiteID,SiteName)

websitesdata

contain feilds
(SiteID,ip,hits,...)

在更新级联上将SiteID外键设置为删除级联上的网站（SiteID）。

当我删除

中的记录时

websites.SiteID

网站数据中SiteID = sites.SiteID的所有记录都将被删除。但当我更新网站中的记录。我得到了错误＃1452。

如果在websitedata中没有网站数据记录，那么网站数据.SiteID = sites.SiteID我可以更新网站.SiteID值。

我试过了 SET foreign_key_checks = 0; 在两张桌子上，但没有工作。

抱歉我的英文！

修改

-- phpMyAdmin SQL Dump
-- version 3.4.5
-- http://www.phpmyadmin.net
--
-- Host: localhost
-- Generation Time: Apr 30, 2013 at 12:47 PM
-- Server version: 5.5.16
-- PHP Version: 5.3.8

SET SQL_MODE="NO_AUTO_VALUE_ON_ZERO";
SET time_zone = "+00:00";


/*!40101 SET @OLD_CHARACTER_SET_CLIENT=@@CHARACTER_SET_CLIENT */;
/*!40101 SET @OLD_CHARACTER_SET_RESULTS=@@CHARACTER_SET_RESULTS */;
/*!40101 SET @OLD_COLLATION_CONNECTION=@@COLLATION_CONNECTION */;
/*!40101 SET NAMES utf8 */;

--
-- Database: `begardin`
--

-- --------------------------------------------------------

--
-- Table structure for table `websites`
--

CREATE TABLE IF NOT EXISTS `websites` (
  `SiteID` bigint(20) NOT NULL AUTO_INCREMENT,
  `SiteName` varchar(50) COLLATE utf32_unicode_ci NOT NULL,
  PRIMARY KEY (`SiteID`,`SiteName`)
) ENGINE=InnoDB  DEFAULT CHARSET=utf32 COLLATE=utf32_unicode_ci AUTO_INCREMENT=8 ;

/*!40101 SET CHARACTER_SET_CLIENT=@OLD_CHARACTER_SET_CLIENT */;
/*!40101 SET CHARACTER_SET_RESULTS=@OLD_CHARACTER_SET_RESULTS */;
/*!40101 SET COLLATION_CONNECTION=@OLD_COLLATION_CONNECTION */;


-- phpMyAdmin SQL Dump
-- version 3.4.5
-- http://www.phpmyadmin.net
--
-- Host: localhost
-- Generation Time: Apr 30, 2013 at 12:46 PM
-- Server version: 5.5.16
-- PHP Version: 5.3.8

SET SQL_MODE="NO_AUTO_VALUE_ON_ZERO";
SET time_zone = "+00:00";


/*!40101 SET @OLD_CHARACTER_SET_CLIENT=@@CHARACTER_SET_CLIENT */;
/*!40101 SET @OLD_CHARACTER_SET_RESULTS=@@CHARACTER_SET_RESULTS */;
/*!40101 SET @OLD_COLLATION_CONNECTION=@@COLLATION_CONNECTION */;
/*!40101 SET NAMES utf8 */;

--
-- Database: `begardin`
--

-- --------------------------------------------------------

--
-- Table structure for table `websitesdata`
--

CREATE TABLE IF NOT EXISTS `websitesdata` (
  `SiteID` bigint(20) NOT NULL,
  `day` date NOT NULL,
  `ip` varchar(15) COLLATE utf32_unicode_ci NOT NULL,
  `Hits` bigint(20) unsigned NOT NULL,
  PRIMARY KEY (`SiteID`,`day`,`ip`),
  KEY `SiteID` (`SiteID`)
) ENGINE=InnoDB DEFAULT CHARSET=utf32 COLLATE=utf32_unicode_ci;

--
-- Constraints for dumped tables
--

--
-- Constraints for table `websitesdata`
--
ALTER TABLE `websitesdata`
  ADD CONSTRAINT `websitesdata_ibfk_3` FOREIGN KEY (`SiteID`) REFERENCES `websites` (`SiteID`) ON DELETE CASCADE ON UPDATE CASCADE,
  ADD CONSTRAINT `dd` FOREIGN KEY (`SiteID`) REFERENCES `websites` (`SiteID`) ON DELETE CASCADE ON UPDATE CASCADE,
  ADD CONSTRAINT `websitesdata_ibfk_1` FOREIGN KEY (`SiteID`) REFERENCES `websites` (`SiteID`) ON DELETE CASCADE,
  ADD CONSTRAINT `websitesdata_ibfk_2` FOREIGN KEY (`SiteID`) REFERENCES `websites` (`SiteID`) ON UPDATE CASCADE;

/*!40101 SET CHARACTER_SET_CLIENT=@OLD_CHARACTER_SET_CLIENT */;
/*!40101 SET CHARACTER_SET_RESULTS=@OLD_CHARACTER_SET_RESULTS */;
/*!40101 SET COLLATION_CONNECTION=@OLD_COLLATION_CONNECTION */;

尝试更新和＃1452 - 无法添加或更新子行：外键约束失败

0 个答案: