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第 24 章 Spring Data 最佳實踐
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第 24 章 Spring Data 最佳實踐

目錄

24.1. MySQL
24.1.1. 分類表
24.1.2. 為欄位增加索引
24.1.3. 復合索引
24.1.4. 一對多實例
24.1.5. ManyToMany 多對多
24.1.6. 外鍵級聯刪除
24.2. MongoDB
24.2.1. 枚舉定義
24.2.2. 日誌表
24.2.3. 地址與定位

24.1. MySQL

ORM的出現解決了程序猿學習資料庫學歷成本，也加快了開發的速度。程序猿無需再學習資料庫定義語言DDL以及資料庫客戶端，也無需關注建表這些繁瑣的工作，同時也降低了資料庫結構變更管理中與DBA頻繁溝通的成本。。

在過去的兩年中我們採用 Spring Data JPA 定義資料庫，訪問資料庫，積累了很多經驗，最終我們發現使用 Spring Data 實體定義完全可以代替 DBA 的建模工作。

下面我們採用案例，一個一個講解，各種資料庫實體關係的定義。相關資料庫建模知識請先閲讀 《Netkiller Architect 手札》 以及 《Netkiller Spring 手札》

24.1.1. 分類表

這是一個通用分類表，常見的父子關係加上path路徑

		
 +-----------+
 | category  |
 |-----------|
 |id         | <---+
 |name       |     |
 |description|    1:n
 |status     |     |
 |pid        | o---+
 |path       |
 |status     |
 |ctime      |
 |mtime      |
 +-----------+
		
			
		
package cn.netkiller.domain;

import java.util.Date;
import java.util.Set;

import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import javax.persistence.OneToMany;

import org.springframework.format.annotation.DateTimeFormat;

import com.fasterxml.jackson.annotation.JsonFormat;
import com.fasterxml.jackson.annotation.JsonIgnore;

@Entity
public class Category {
	@Id
	@GeneratedValue(strategy = GenerationType.IDENTITY)
	@Column(name = "id", unique = true, nullable = false, insertable = true, updatable = false)
	public int id;
	public String name;
	public String description;
	public String path;

	@Column(columnDefinition = "enum('Enabled','Disabled') DEFAULT 'Enabled' COMMENT '狀態'")
	public String status;

	@DateTimeFormat(pattern = "yyyy-MM-dd HH:mm:ss")
	@JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss", timezone = "GMT+8")
	@Column(columnDefinition = "TIMESTAMP DEFAULT CURRENT_TIMESTAMP COMMENT '創建時間'")
	public Date ctime;

	@DateTimeFormat(pattern = "yyyy-MM-dd HH:mm:ss")
	@JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss", timezone = "GMT+8")
	@Column(columnDefinition = "TIMESTAMP NULL DEFAULT NULL ON UPDATE CURRENT_TIMESTAMP COMMENT '更改時間'")
	public Date mtime;

	@ManyToOne(cascade = { CascadeType.PERSIST, CascadeType.REMOVE })
	@JoinColumn(name = "pid", referencedColumnName = "id")
	private Category categorys;

	@JsonIgnore
	@OneToMany(cascade = CascadeType.ALL, mappedBy = "category", fetch = FetchType.EAGER)
	private Set<Category> category;

	public int getId() {
		return id;
	}

	public void setId(int id) {
		this.id = id;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public String getDescription() {
		return description;
	}

	public void setDescription(String description) {
		this.description = description;
	}

	public String getPath() {
		return path;
	}

	public void setPath(String path) {
		this.path = path;
	}

	public String getStatus() {
		return status;
	}

	public void setStatus(String status) {
		this.status = status;
	}

	public Date getCtime() {
		return ctime;
	}

	public void setCtime(Date ctime) {
		this.ctime = ctime;
	}

	public Date getMtime() {
		return mtime;
	}

	public void setMtime(Date mtime) {
		this.mtime = mtime;
	}

	public Category getCategorys() {
		return categorys;
	}

	public void setCategorys(Category categorys) {
		this.categorys = categorys;
	}

	public Set<Category> getCategory() {
		return category;
	}

	public void setCategory(Set<Category> category) {
		this.category = category;
	}

	@Override
	public String toString() {
		return "Category [id=" + id + ", name=" + name + ", description=" + description + ", path=" + path + ", status="
				+ status + ", ctime=" + ctime + ", mtime=" + mtime + ", categorys=" + categorys + ", category="
				+ category + "]";
	}

}

期望結果

		
CREATE TABLE `category` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `ctime` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '',
  `description` varchar(255) DEFAULT NULL,
  `mtime` timestamp NULL DEFAULT NULL ON UPDATE CURRENT_TIMESTAMP COMMENT '',
  `name` varchar(255) DEFAULT NULL,
  `path` varchar(255) DEFAULT NULL,
  `status` enum('Enabled','Disabled') DEFAULT 'Enabled' COMMENT '',
  `pid` int(11) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8

24.1.2. 為欄位增加索引

我們希望為 name 和 path 欄位增加普通索引

		
package cn.netkiller.domain;

import java.util.Date;
import java.util.Set;

import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Index;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import javax.persistence.OneToMany;
import javax.persistence.Table;

import org.springframework.format.annotation.DateTimeFormat;

import com.fasterxml.jackson.annotation.JsonFormat;
import com.fasterxml.jackson.annotation.JsonIgnore;

@Entity
@Table(indexes = { @Index(name = "name", columnList = "name DESC"), @Index(name = "path", columnList = "path") })
public class Category {
	@Id
	@GeneratedValue(strategy = GenerationType.IDENTITY)
	@Column(name = "id", unique = true, nullable = false, insertable = true, updatable = false)
	public int id;
	public String name;
	public String description;
	public String path;

	@Column(columnDefinition = "enum('Enabled','Disabled') DEFAULT 'Enabled' COMMENT '狀態'")
	public String status;

	@DateTimeFormat(pattern = "yyyy-MM-dd HH:mm:ss")
	@JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss", timezone = "GMT+8")
	@Column(columnDefinition = "TIMESTAMP DEFAULT CURRENT_TIMESTAMP COMMENT '創建時間'")
	public Date ctime;

	@DateTimeFormat(pattern = "yyyy-MM-dd HH:mm:ss")
	@JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss", timezone = "GMT+8")
	@Column(columnDefinition = "TIMESTAMP NULL DEFAULT NULL ON UPDATE CURRENT_TIMESTAMP COMMENT '更改時間'")
	public Date mtime;

	@ManyToOne(cascade = { CascadeType.PERSIST, CascadeType.REMOVE })
	@JoinColumn(name = "pid", referencedColumnName = "id")
	private Category categorys;

	@JsonIgnore
	@OneToMany(cascade = CascadeType.ALL, mappedBy = "category", fetch = FetchType.EAGER)
	private Set<Category> category;

	public int getId() {
		return id;
	}

	public void setId(int id) {
		this.id = id;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public String getDescription() {
		return description;
	}

	public void setDescription(String description) {
		this.description = description;
	}

	public String getPath() {
		return path;
	}

	public void setPath(String path) {
		this.path = path;
	}

	public String getStatus() {
		return status;
	}

	public void setStatus(String status) {
		this.status = status;
	}

	public Date getCtime() {
		return ctime;
	}

	public void setCtime(Date ctime) {
		this.ctime = ctime;
	}

	public Date getMtime() {
		return mtime;
	}

	public void setMtime(Date mtime) {
		this.mtime = mtime;
	}

	public Category getCategorys() {
		return categorys;
	}

	public void setCategorys(Category categorys) {
		this.categorys = categorys;
	}

	public Set<Category> getCategory() {
		return category;
	}

	public void setCategory(Set<Category> category) {
		this.category = category;
	}

	@Override
	public String toString() {
		return "Category [id=" + id + ", name=" + name + ", description=" + description + ", path=" + path + ", status="
				+ status + ", ctime=" + ctime + ", mtime=" + mtime + ", categorys=" + categorys + ", category="
				+ category + "]";
	}

}

期望結果

		
CREATE TABLE `category` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `ctime` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '????',
  `description` varchar(255) DEFAULT NULL,
  `mtime` timestamp NULL DEFAULT NULL ON UPDATE CURRENT_TIMESTAMP COMMENT '????',
  `name` varchar(255) DEFAULT NULL,
  `path` varchar(255) DEFAULT NULL,
  `status` enum('Enabled','Disabled') DEFAULT 'Enabled' COMMENT '??',
  `pid` int(11) DEFAULT NULL,
  PRIMARY KEY (`id`),
  KEY `name` (`name`),
  KEY `path` (`path`),
  KEY `FKeiel7nqjxu4kmefso9tm9qcsu` (`pid`),
  CONSTRAINT `FKeiel7nqjxu4kmefso9tm9qcsu` FOREIGN KEY (`pid`) REFERENCES `category` (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8

24.1.3. 復合索引

創建由多個欄位組成的復合索引，如： "member_id", "articleId"

		
package cn.netkiller.api.model;

import java.io.Serializable;
import java.util.Date;

import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import javax.persistence.Table;
import javax.persistence.Temporal;
import javax.persistence.TemporalType;
import javax.persistence.UniqueConstraint;

import com.fasterxml.jackson.annotation.JsonFormat;

@Entity
@Table(name = "comment", uniqueConstraints = { @UniqueConstraint(columnNames = { "member_id", "articleId" }) })
public class Comment implements Serializable {
	/**
	 * 
	 */
	private static final long serialVersionUID = -1484408775034277681L;
	@Id
	@GeneratedValue(strategy = GenerationType.IDENTITY)
	@Column(name = "id", unique = true, nullable = false, insertable = true, updatable = false)
	private int id;

	@ManyToOne(cascade = { CascadeType.ALL })
	@JoinColumn(name = "member_id")
	private Member member;

	private int articleId;

	private String message;

	@JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss")
	@Temporal(TemporalType.TIMESTAMP)
	@Column(updatable = false)
	@org.hibernate.annotations.CreationTimestamp
	protected Date createDate;

	public int getId() {
		return id;
	}

	public void setId(int id) {
		this.id = id;
	}

	public Member getMember() {
		return member;
	}

	public void setMember(Member member) {
		this.member = member;
	}

	public int getArticleId() {
		return articleId;
	}

	public void setArticleId(int articleId) {
		this.articleId = articleId;
	}

	public String getMessage() {
		return message;
	}

	public void setMessage(String message) {
		this.message = message;
	}

	public Date getCreateDate() {
		return createDate;
	}

	public void setCreateDate(Date createDate) {
		this.createDate = createDate;
	}
}

期望結果

		
CREATE TABLE `comment` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `article_id` int(11) NOT NULL,
  `create_date` datetime DEFAULT NULL,
  `message` varchar(255) DEFAULT NULL,
  `member_id` int(11) DEFAULT NULL,
  PRIMARY KEY (`id`),
  UNIQUE KEY `UK5qxfiu92nwlvgli7bl3evl11m` (`member_id`,`article_id`),
  CONSTRAINT `FKmrrrpi513ssu63i2783jyiv9m` FOREIGN KEY (`member_id`) REFERENCES `member` (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

24.1.4. 一對多實例

如下圖，我們將實現 categroy 和 article 的一對多關係

		
      +-----------+
      | category  |
      |-----------|
  +-->|id         | <---+
  |   |title      |     |
  |   |description|    1:n
  |   |status     |     |
  |   |parent_id  | o---+
  |   +-----------+
  |
 1:n
  |
  |   +-----------------+            +-----------------+
  |   | article         |            | feedback        |
  |   |-----------------|            |-----------------|
  |   |id               |<--1:n--+   |id               |
  |   |title            |        |   |title            |
  |   |content          |        |   |content          |
  |   |datetime         |        |   |datetime         |
  |   |status           |        |   |status           |
  +--o|category_id      |        +--o|article_id       |
  +--o|member_id        |        +-->|member_id        |
  |   +-----------------+        |   +-----------------+
  |   | 2007,2008,2009  |        |   | 2007,2008,2009  |
  |   +-----------------+        |   +-----------------+
  |                              |
 1:n  +----------+     +---1:n---+
  |   | member   |     |
  |   |----------|     |
  +-->|id        | <---+
      |user      |
      |passwd    |
      |nickname  |
      |status    |
      +----------+

首先定義分類實體類

		
package cn.netkiller.domain;

import java.util.Date;
import java.util.Set;

import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Index;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import javax.persistence.OneToMany;
import javax.persistence.Table;

import org.springframework.format.annotation.DateTimeFormat;

import com.fasterxml.jackson.annotation.JsonFormat;
import com.fasterxml.jackson.annotation.JsonIgnore;

@Entity
@Table(indexes = { @Index(name = "name", columnList = "name DESC"), @Index(name = "path", columnList = "path") })
public class Category {
	@Id
	@GeneratedValue(strategy = GenerationType.IDENTITY)
	@Column(name = "id", unique = true, nullable = false, insertable = true, updatable = false)
	public int id;
	public String name;
	public String description;
	public String path;

	@Column(columnDefinition = "enum('Enabled','Disabled') DEFAULT 'Enabled' COMMENT '狀態'")
	public String status;

	@DateTimeFormat(pattern = "yyyy-MM-dd HH:mm:ss")
	@JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss", timezone = "GMT+8")
	@Column(columnDefinition = "TIMESTAMP DEFAULT CURRENT_TIMESTAMP COMMENT '創建時間'")
	public Date ctime;

	@DateTimeFormat(pattern = "yyyy-MM-dd HH:mm:ss")
	@JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss", timezone = "GMT+8")
	@Column(columnDefinition = "TIMESTAMP NULL DEFAULT NULL ON UPDATE CURRENT_TIMESTAMP COMMENT '更改時間'")
	public Date mtime;

	@ManyToOne(cascade = { CascadeType.PERSIST, CascadeType.REMOVE })
	@JoinColumn(name = "pid", referencedColumnName = "id")
	private Category categorys;

	@JsonIgnore
	@OneToMany(cascade = CascadeType.ALL, mappedBy = "category", fetch = FetchType.EAGER)
	private Set<Category> category;

	@JsonIgnore
	@OneToMany(cascade = CascadeType.ALL, mappedBy = "category", orphanRemoval = true)
	private Set<Article> article;

	public int getId() {
		return id;
	}

	public void setId(int id) {
		this.id = id;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public String getDescription() {
		return description;
	}

	public void setDescription(String description) {
		this.description = description;
	}

	public String getPath() {
		return path;
	}

	public void setPath(String path) {
		this.path = path;
	}

	public String getStatus() {
		return status;
	}

	public void setStatus(String status) {
		this.status = status;
	}

	public Date getCtime() {
		return ctime;
	}

	public void setCtime(Date ctime) {
		this.ctime = ctime;
	}

	public Date getMtime() {
		return mtime;
	}

	public void setMtime(Date mtime) {
		this.mtime = mtime;
	}

	public Category getCategorys() {
		return categorys;
	}

	public void setCategorys(Category categorys) {
		this.categorys = categorys;
	}

	public Set<Category> getCategory() {
		return category;
	}

	public void setCategory(Set<Category> category) {
		this.category = category;
	}

	@Override
	public String toString() {
		return "Category [id=" + id + ", name=" + name + ", description=" + description + ", path=" + path + ", status="
				+ status + ", ctime=" + ctime + ", mtime=" + mtime + ", categorys=" + categorys + ", category="
				+ category + "]";
	}

}

定義文章實體類

		
package cn.netkiller.domain;

import java.io.Serializable;
import java.util.Date;
import java.util.Set;

import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.ManyToOne;
import javax.persistence.OneToMany;
import javax.persistence.Table;

import org.springframework.format.annotation.DateTimeFormat;

import com.fasterxml.jackson.annotation.JsonFormat;
import com.fasterxml.jackson.annotation.JsonIgnore;

@Entity
@Table(name = "article")
public class Article implements Serializable {
	private static final long serialVersionUID = 7603772682950271321L;

	@Id
	@GeneratedValue(strategy = GenerationType.IDENTITY)
	@Column(name = "id", unique = true, nullable = false, insertable = true, updatable = false)
	public int id;
	public String title;
	@Column(name = "short")
	public String shortTitle;
	public String description;
	public String author;
	public int star;
	public String tag;
	public boolean share;
	public boolean status;
	public String content;

	@ManyToOne(cascade = { CascadeType.PERSIST, CascadeType.REMOVE })
	@JoinColumn(name = "category_id", referencedColumnName = "id")
	private Category category;

	@ManyToOne(cascade = { CascadeType.PERSIST, CascadeType.REMOVE })
	@JoinColumn(name = "site_id", referencedColumnName = "id")
	private Site site;

	@ManyToOne(cascade = { CascadeType.ALL })
	@JoinColumn(name = "member_id", referencedColumnName = "id")
	private Member member;

	@DateTimeFormat(pattern = "yyyy-MM-dd HH:mm:ss")
	@JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss", timezone = "GMT+8")
	@Column(columnDefinition = "TIMESTAMP DEFAULT CURRENT_TIMESTAMP COMMENT '創建時間'")
	public Date ctime;

	@DateTimeFormat(pattern = "yyyy-MM-dd HH:mm:ss")
	@JsonFormat(pattern = "yyyy-MM-dd HH:mm:ss", timezone = "GMT+8")
	@Column(columnDefinition = "TIMESTAMP NULL DEFAULT NULL ON UPDATE CURRENT_TIMESTAMP COMMENT '更改時間'")
	public Date mtime;

	@JsonIgnore
	@OneToMany(cascade = CascadeType.ALL, mappedBy = "article", fetch = FetchType.EAGER)
	private Set<Comment> comment;

	@JsonIgnore
	@OneToMany(cascade = CascadeType.ALL, mappedBy = "article", fetch = FetchType.EAGER)
	private Set<Favorites> favorites;

	@JsonIgnore
	@OneToMany(cascade = CascadeType.ALL, mappedBy = "article", orphanRemoval = true)
	private Set<Statistics> statistics;

	public int getId() {
		return id;
	}

	public void setId(int id) {
		this.id = id;
	}

	public String getTitle() {
		return title;
	}

	public void setTitle(String title) {
		this.title = title;
	}

	public String getDescription() {
		return description;
	}

	public void setDescription(String description) {
		this.description = description;
	}

	public Date getCtime() {
		return ctime;
	}

	public void setCtime(Date ctime) {
		this.ctime = ctime;
	}

	public String getShortTitle() {
		return shortTitle;
	}

	public void setShortTitle(String shortTitle) {
		this.shortTitle = shortTitle;
	}

	public String getAuthor() {
		return author;
	}

	public void setAuthor(String author) {
		this.author = author;
	}

	public int getStar() {
		return star;
	}

	public void setStar(int star) {
		this.star = star;
	}

	public String getTag() {
		return tag;
	}

	public void setTag(String tag) {
		this.tag = tag;
	}

	public boolean isShare() {
		return share;
	}

	public void setShare(boolean share) {
		this.share = share;
	}

	public boolean isStatus() {
		return status;
	}

	public void setStatus(boolean status) {
		this.status = status;
	}

	public String getContent() {
		return content;
	}

	public void setContent(String content) {
		this.content = content;
	}

	public Category getCategory() {
		return category;
	}

	public void setCategory(Category category) {
		this.category = category;
	}

	public Member getMember() {
		return member;
	}

	public void setMember(Member member) {
		this.member = member;
	}

	public Set<Comment> getComment() {
		return comment;
	}

	public void setComment(Set<Comment> comment) {
		this.comment = comment;
	}

	public Set<Favorites> getFavorites() {
		return favorites;
	}

	public void setFavorites(Set<Favorites> favorites) {
		this.favorites = favorites;
	}

	public Set<Statistics> getStatistics() {
		return statistics;
	}

	public void setStatistics(Set<Statistics> statistics) {
		this.statistics = statistics;
	}

	public Site getSite() {
		return site;
	}

	public void setSite(Site site) {
		this.site = site;
	}

	public Date getMtime() {
		return mtime;
	}

	public void setMtime(Date mtime) {
		this.mtime = mtime;
	}

	@Override
	public String toString() {
		return "Article [id=" + id + ", title=" + title + ", shortTitle=" + shortTitle + ", description=" + description
				+ ", author=" + author + ", star=" + star + ", tag=" + tag + ", share=" + share + ", status=" + status
				+ ", content=" + content + ", category=" + category + ", site=" + site + ", member=" + member
				+ ", ctime=" + ctime + ", mtime=" + mtime + ", comment=" + comment + ", favorites=" + favorites
				+ ", statistics=" + statistics + "]";
	}

}

希望結果

		
CREATE TABLE `category` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `ctime` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '????',
  `description` varchar(255) DEFAULT NULL,
  `mtime` timestamp NULL DEFAULT NULL ON UPDATE CURRENT_TIMESTAMP COMMENT '????',
  `name` varchar(255) DEFAULT NULL,
  `path` varchar(255) DEFAULT NULL,
  `status` enum('Enabled','Disabled') DEFAULT 'Enabled' COMMENT '??',
  `pid` int(11) DEFAULT NULL,
  PRIMARY KEY (`id`),
  KEY `name` (`name`),
  KEY `path` (`path`),
  KEY `FKeiel7nqjxu4kmefso9tm9qcsu` (`pid`),
  CONSTRAINT `FKeiel7nqjxu4kmefso9tm9qcsu` FOREIGN KEY (`pid`) REFERENCES `category` (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

CREATE TABLE `article` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `author` varchar(255) DEFAULT NULL,
  `content` varchar(255) DEFAULT NULL,
  `ctime` timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP COMMENT '????',
  `description` varchar(255) DEFAULT NULL,
  `mtime` timestamp NULL DEFAULT NULL ON UPDATE CURRENT_TIMESTAMP COMMENT '????',
  `share` bit(1) NOT NULL,
  `short` varchar(255) DEFAULT NULL,
  `star` int(11) NOT NULL,
  `status` bit(1) NOT NULL,
  `tag` varchar(255) DEFAULT NULL,
  `title` varchar(255) DEFAULT NULL,
  `category_id` int(11) DEFAULT NULL,
  `member_id` int(11) DEFAULT NULL,
  `site_id` int(11) DEFAULT NULL,
  PRIMARY KEY (`id`),
  KEY `FKy5kkohbk00g0w88fi05k2hcw` (`category_id`),
  KEY `FK6l9vkfd5ixw8o8kph5rj1k7gu` (`member_id`),
  KEY `FKrxbc33rok9m4n6pnbbwb3piwf` (`site_id`),
  CONSTRAINT `FK6l9vkfd5ixw8o8kph5rj1k7gu` FOREIGN KEY (`member_id`) REFERENCES `member` (`id`),
  CONSTRAINT `FKrxbc33rok9m4n6pnbbwb3piwf` FOREIGN KEY (`site_id`) REFERENCES `site` (`id`),
  CONSTRAINT `FKy5kkohbk00g0w88fi05k2hcw` FOREIGN KEY (`category_id`) REFERENCES `category` (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

現在我們已經將 categroy 與 article 兩張表一對多關係建立起來。

24.1.5. ManyToMany 多對多

用戶與角色就是一個多對多的關係，多對多是需要中間表做關聯的。所以需要一個 user_has_role 表。

			
    +----------+          +---------------+            +--------+
    | users    |          | user_has_role |            | role   |
    +----------+          +---------------+            +--------+
    | id       | <------o | user_id       |      /---> | id     |
    | name     |          | role_id       | o---+      | name   |
    | password |          |               |            |        |
    +----------+          +---------------+            +--------+

創建 User 表

			
package cn.netkiller.api.domain.test;

import java.io.Serializable;
import java.util.Set;

import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinTable;
import javax.persistence.ManyToMany;
import javax.persistence.Table;
import javax.persistence.JoinColumn;

@Entity
@Table(name = "users")
public class Users implements Serializable {
	/**
	 * 
	 */
	private static final long serialVersionUID = -2480194112597046349L;
	@Id
	@GeneratedValue(strategy = GenerationType.AUTO)
	private int id;
	private String name;
	private String password;

	@ManyToMany(fetch = FetchType.EAGER)
	@JoinTable(name = "user_has_role", joinColumns = { @JoinColumn(name = "user_id", referencedColumnName = "id") }, inverseJoinColumns = { @JoinColumn(name = "role_id", referencedColumnName = "id") })
	private Set<Roles> roles;

	public int getId() {
		return id;
	}

	public void setId(int id) {
		this.id = id;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public String getPassword() {
		return password;
	}

	public void setPassword(String password) {
		this.password = password;
	}

	public Set<Roles> getRoles() {
		return roles;
	}

	public void setRoles(Set<Roles> roles) {
		this.roles = roles;
	}

	@Override
	public String toString() {
		return "Users [id=" + id + ", name=" + name + ", password=" + password + ", roles=" + roles + "]";
	}

}

創建 Role 表

			
package cn.netkiller.api.domain.test;

import java.io.Serializable;
import java.util.Set;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.ManyToMany;
import javax.persistence.Table;

@Entity
@Table(name = "roles")
public class Roles implements Serializable {
	private static final long serialVersionUID = 6737037465677800326L;
	@Id
	@GeneratedValue(strategy = GenerationType.AUTO)
	private int id;
	private String name;
	@ManyToMany(mappedBy = "roles")
	private Set<Users> users;

	public int getId() {
		return id;
	}

	public void setId(int id) {
		this.id = id;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public Set<Users> getUsers() {
		return users;
	}

	public void setUsers(Set<Users> users) {
		this.users = users;
	}

	@Override
	public String toString() {
		return "Roles [id=" + id + ", name=" + name + ", users=" + users + "]";
	}

}

最終產生資料庫表如下

			
CREATE TABLE `users` (
	`id` INT(11) NOT NULL AUTO_INCREMENT,
	`name` VARCHAR(255) NULL DEFAULT NULL,
	`password` VARCHAR(255) NULL DEFAULT NULL,
	PRIMARY KEY (`id`)
)
COLLATE='utf8_general_ci'
ENGINE=InnoDB;	

CREATE TABLE `roles` (
	`id` INT(11) NOT NULL AUTO_INCREMENT,
	`name` VARCHAR(255) NULL DEFAULT NULL,
	PRIMARY KEY (`id`)
)
COLLATE='utf8_general_ci'
ENGINE=InnoDB;
			
CREATE TABLE `user_has_role` (
	`user_id` INT(11) NOT NULL,
	`role_id` INT(11) NOT NULL,
	PRIMARY KEY (`user_id`, `role_id`),
	INDEX `FKsvvq61v3koh04fycopbjx72hj` (`role_id`),
	CONSTRAINT `FK2dl1ftxlkldulcp934i3125qo` FOREIGN KEY (`user_id`) REFERENCES `users` (`id`),
	CONSTRAINT `FKsvvq61v3koh04fycopbjx72hj` FOREIGN KEY (`role_id`) REFERENCES `roles` (`id`)
)
COLLATE='utf8_general_ci'
ENGINE=InnoDB;

24.1.6. 外鍵級聯刪除

orphanRemoval = true 可以實現數據級聯刪除

			
package cn.netkiller.api.domain;

import java.io.Serializable;
import java.util.Set;

import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.OneToMany;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Table;

import com.fasterxml.jackson.annotation.JsonIgnore;

@Entity
@Table(name = "member")
public class Member implements Serializable {
	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;

	@Id
	@GeneratedValue(strategy = GenerationType.IDENTITY)
	@Column(name = "id", unique = true, nullable = false, insertable = true, updatable = false)
	private int id;

	private String name;
	private String sex;
	private int age;
	private String wechat;

	@Column(unique = true)
	private String mobile;
	private String picture;
	private String ipAddress;

	@JsonIgnore
	@OneToMany(cascade = CascadeType.ALL, orphanRemoval = true, mappedBy = "member")
	private Set<Comment> comment;
	@JsonIgnore
	@OneToMany(cascade = CascadeType.ALL, orphanRemoval = true, mappedBy = "member")
	private Set<StatisticsHistory> statisticsHistory;

	public Member() {
	}

	public Member(int id) {
		this.id = id;
	}

	public int getId() {
		return id;
	}

	public void setId(int id) {
		this.id = id;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}

	public String getSex() {
		return sex;
	}

	public void setSex(String sex) {
		this.sex = sex;
	}

	public int getAge() {
		return age;
	}

	public void setAge(int age) {
		this.age = age;
	}

	public String getWechat() {
		return wechat;
	}

	public void setWechat(String wechat) {
		this.wechat = wechat;
	}

	public String getMobile() {
		return mobile;
	}

	public void setMobile(String mobile) {
		this.mobile = mobile;
	}

	public String getPicture() {
		return picture;
	}

	public void setPicture(String picture) {
		this.picture = picture;
	}

	public String getIpAddress() {
		return ipAddress;
	}

	public void setIpAddress(String ipAddress) {
		this.ipAddress = ipAddress;
	}

	@Override
	public String toString() {
		return "Member [id=" + id + ", name=" + name + ", sex=" + sex + ", age=" + age + ", wechat=" + wechat + ", mobile=" + mobile + ", picture=" + picture + ", ipAddress=" + ipAddress + "]";
	}

}

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23.2. Cassandra 起始頁 24.2. MongoDB