Question

我正在阅读一本书，希望我在我的数据库中创建以下关系：

ALTER TABLE 'tbl_issue' ADD CONSTRAINT 'FK_issue_project' FOREIGN KEY ('project_id') REFERENCES 'tbl_project' ('id') ON DELETE CASCADE ON UPDATE RESTRICT;
ALTER TABLE 'tbl_issue' ADD CONSTRAINT 'FK_issue_owner' FOREIGN KEY ('owner_id') REFERENCES 'tbl_user' ('id') ON DELETE CASCADE ON UPDATE RESTRICT;
ALTER TABLE 'tbl_issue' ADD CONSTRAINT 'FK_issue_requester' FOREIGN KEY ('requester_id') REFERENCES 'tbl_user' ('id') ON DELETE CASCADE ON UPDATE RESTRICT;
ALTER TABLE 'tbl_project_user' ADD CONSTRAINT 'FK_project_ user' FOREIGN KEY ('project_id') REFERENCES 'tbl_project' ('id') ON DELETE CASCADE ON UPDATE RESTRICT;
ALTER TABLE 'tbl_project_user' ADD CONSTRAINT 'FK_user_ project' FOREIGN KEY ('user_id') REFERENCES 'tbl_user' ('id') ON DELETE CASCADE ON UPDATE RESTRICT;

当我尝试运行SQL时，出现如下错误：

#1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ''tbl_issue' ADD CONSTRAINT 'FK_issue_project' FOREIGN KEY ('project_id') REFEREN' at line 1

所以，我想在phpMyAdmin中尝试（可视化）。你是怎么做到的？

DB SQL：

-- phpMyAdmin SQL Dump
-- version 3.3.9.2
-- http://www.phpmyadmin.net
--
-- Host: localhost
-- Generation Time: May 24, 2011 at 01:27 PM
-- Server version: 5.5.9
-- PHP Version: 5.3.5

SET SQL_MODE="NO_AUTO_VALUE_ON_ZERO";

--
-- Database: `trackstar`
--

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

--
-- Table structure for table `tbl_issue`
--

CREATE TABLE `tbl_issue` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `name` varchar(256) NOT NULL,
  `description` varchar(2000) DEFAULT NULL,
  `project_id` int(11) DEFAULT NULL,
  `type_id` int(11) DEFAULT NULL,
  `status_id` int(11) DEFAULT NULL,
  `owner_id` int(11) DEFAULT NULL,
  `requester_id` int(11) DEFAULT NULL,
  `create_time` datetime DEFAULT NULL,
  `create_user_id` int(11) DEFAULT NULL,
  `update_time` datetime DEFAULT NULL,
  `update_user_id` int(11) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 AUTO_INCREMENT=1 ;

--
-- Dumping data for table `tbl_issue`
--


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

--
-- Table structure for table `tbl_project`
--

CREATE TABLE `tbl_project` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `name` varchar(128) DEFAULT NULL,
  `description` text,
  `create_time` datetime DEFAULT NULL,
  `create_user_id` int(11) DEFAULT NULL,
  `update_time` datetime DEFAULT NULL,
  `update_user_id` int(11) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 AUTO_INCREMENT=1 ;

--
-- Dumping data for table `tbl_project`
--


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

--
-- Table structure for table `tbl_project_user`
--

CREATE TABLE `tbl_project_user` (
  `project_id` int(11) NOT NULL,
  `user_id` int(11) NOT NULL,
  `create_time` datetime DEFAULT NULL,
  `create_user_id` int(11) DEFAULT NULL,
  `update_time` datetime DEFAULT NULL,
  `update_user_id` int(11) DEFAULT NULL,
  PRIMARY KEY (`project_id`,`user_id`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1;

--
-- Dumping data for table `tbl_project_user`
--


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

--
-- Table structure for table `tbl_user`
--

CREATE TABLE `tbl_user` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `email` varchar(256) NOT NULL,
  `username` varchar(256) DEFAULT NULL,
  `password` varchar(256) DEFAULT NULL,
  `last_login_time` datetime DEFAULT NULL,
  `create_time` datetime DEFAULT NULL,
  `create_user_id` int(11) DEFAULT NULL,
  `update_time` datetime DEFAULT NULL,
  `update_user_id` int(11) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1 AUTO_INCREMENT=1 ;

--
-- Dumping data for table `tbl_user`
--

Answer 1

删除表名周围的引号 - 引号让MySQL认为你正在改变字符串，而不是表：

ALTER TABLE tbl_issue ADD CONSTRAINT 'FK_issue_project' FOREIGN KEY ('project_id') REFERENCES tbl_project ('id') ON DELETE CASCADE ON UPDATE RESTRICT;

Answer 2

你应该使用反引号，如下：

ALTER TABLE `tbl_issue`
ADD CONSTRAINT `FK_issue_project` FOREIGN KEY (`project_id`)
    REFERENCES `tbl_project` (`id`) ON DELETE CASCADE ON UPDATE RESTRICT;

如何在phpMyAdmin中创建此关系？

2 个答案: