package com.liuwenwu.four.entity;import java.util.HashSet;
import java.util.Set;public class TreeNode {private Integer nodeId;private String nodeName;private Integer treeNodeType;private Integer position;private String url;private TreeNode parent;private Set<TreeNode> children = new HashSet<TreeNode>();private Integer initChildren = 0;
//    0是代表懒加载  1强制加载子节点  2强制加载用户  3强制加载两个public Integer getNodeId() {return nodeId;}public void setNodeId(Integer nodeId) {this.nodeId = nodeId;}public String getNodeName() {return nodeName;}public void setNodeName(String nodeName) {this.nodeName = nodeName;}public Integer getTreeNodeType() {return treeNodeType;}public void setTreeNodeType(Integer treeNodeType) {this.treeNodeType = treeNodeType;}public Integer getPosition() {return position;}public void setPosition(Integer position) {this.position = position;}public String getUrl() {return url;}public void setUrl(String url) {this.url = url;}public TreeNode getParent() {return parent;}public void setParent(TreeNode parent) {this.parent = parent;}public Set<TreeNode> getChildren() {return children;}public void setChildren(Set<TreeNode> children) {this.children = children;}public Integer getInitChildren() {return initChildren;}public void setInitChildren(Integer initChildren) {this.initChildren = initChildren;}@Overridepublic String toString() {return "TreeNode [nodeId=" + nodeId + ", nodeName=" + nodeName + ", treeNodeType=" + treeNodeType+ ", position=" + position + ", url=" + url + "]";}
}

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN""http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<hibernate-mapping><class name="com.liuwenwu.four.entity.TreeNode" table="t_hibernate_sys_tree_node"><id name="nodeId" type="java.lang.Integer" column="tree_node_id"><generator class="increment" /></id><property name="nodeName" type="java.lang.String"column="tree_node_name"></property><property name="treeNodeType" type="java.lang.Integer"column="tree_node_type"></property><property name="position" type="java.lang.Integer"column="position"></property><property name="url" type="java.lang.String"column="url"></property><many-to-one name="parent" class="com.liuwenwu.four.entity.TreeNode" column="parent_node_id"/><set name="children" cascade="save-update" inverse="true"><key column="parent_node_id"></key><one-to-many class="com.liuwenwu.four.entity.TreeNode"/></set></class>
</hibernate-mapping>

<!-- 一对多的自关联 -->
<mapping resource="com/liuwenwu/four/entity/TreeNode.hbm.xml"/>

package com.liuwenwu.four.dao;import org.hibernate.Hibernate;
import org.hibernate.Session;
import org.hibernate.Transaction;import com.liuwenwu.four.entity.TreeNode;
import com.liuwenwu.two.util.SessionFactoryUtils;public class TreeNodeDao {public TreeNode load(TreeNode treeNode) {Session session = SessionFactoryUtils.openSession();Transaction transaction = session.beginTransaction();TreeNode t = session.load(TreeNode.class, treeNode.getNodeId());if(t != null && new Integer(1).equals(treeNode.getInitChildren())) {Hibernate.initialize(t.getChildren());Hibernate.initialize(t.getParent());}transaction.commit();session.close();return t;}
}

package com.liuwenwu.four.dao;import org.junit.Test;import com.liuwenwu.four.entity.TreeNode;public class TreeNodeDaoTest {private TreeNodeDao treeNodeDao = new TreeNodeDao();@Testpublic void testLoad() {TreeNode treeNode = new TreeNode();treeNode.setNodeId(6);treeNode.setInitChildren(1);TreeNode t = this.treeNodeDao.load(treeNode);
//        当前节点System.out.println(t);
//        父节点System.out.println(t.getParent());
//        子节点System.out.println(t.getChildren());}
}

package com.liuwenwu.four.dao;import org.hibernate.Hibernate;
import org.hibernate.Session;
import org.hibernate.Transaction;import com.liuwenwu.four.entity.TreeNode;
import com.liuwenwu.two.util.SessionFactoryUtils;public class TreeNodeDao {public TreeNode load(TreeNode treeNode) {Session session = SessionFactoryUtils.openSession();Transaction transaction = session.beginTransaction();TreeNode t = session.load(TreeNode.class, treeNode.getNodeId());//强制加载子节点if(t != null && new Integer(1).equals(treeNode.getInitChildren())) {Hibernate.initialize(t.getParent());}//强制加载用户if(t != null && new Integer(2).equals(treeNode.getInitChildren())) {Hibernate.initialize(t.getChildren());}//强制加载两个if(t != null && new Integer(3).equals(treeNode.getInitChildren())) {Hibernate.initialize(t.getChildren());Hibernate.initialize(t.getParent());}transaction.commit();session.close();return t;}
}

package com.liuwenwu.four.entity;import java.io.Serializable;
import java.util.HashSet;
import java.util.Set;public class Book implements Serializable{
//    book_id int primary key auto_increment,
//       book_name varchar(50) not null,
//       price float not nullprivate Integer bookId;private String bookName;private Float price;private Set<Category> categories = new HashSet<Category>();private Integer initCategories = 0;public Integer getInitCategories() {return initCategories;}public void setInitCategories(Integer initCategories) {this.initCategories = initCategories;}public Integer getBookId() {return bookId;}public void setBookId(Integer bookId) {this.bookId = bookId;}public String getBookName() {return bookName;}public void setBookName(String bookName) {this.bookName = bookName;}public Float getPrice() {return price;}public void setPrice(Float price) {this.price = price;}public Set<Category> getCategories() {return categories;}public void setCategories(Set<Category> categories) {this.categories = categories;}@Overridepublic String toString() {return "Book [bookId=" + bookId + ", bookName=" + bookName + ", price=" + price + "]";}public Book(Integer bookId, String bookName) {super();this.bookId = bookId;this.bookName = bookName;}public Book() {super();}
}

package com.liuwenwu.four.entity;import java.io.Serializable;
import java.util.HashSet;
import java.util.Set;public class Category implements Serializable{
//    category_id int primary key auto_increment,
//       category_name varchar(50) not nullprivate Integer categoryId;private String categoryName;private Set<Book> books = new HashSet<Book>();public Integer getCategoryId() {return categoryId;}public void setCategoryId(Integer categoryId) {this.categoryId = categoryId;}public String getCategoryName() {return categoryName;}public void setCategoryName(String categoryName) {this.categoryName = categoryName;}public Set<Book> getBooks() {return books;}public void setBooks(Set<Book> books) {this.books = books;}@Overridepublic String toString() {return "Category [categoryId=" + categoryId + ", categoryName=" + categoryName + "]";}}

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN""http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<hibernate-mapping><class name="com.liuwenwu.four.entity.Book" table="t_hibernate_book"><id name="bookId" type="java.lang.Integer" column="book_id"><generator class="increment" /></id><property name="bookName" type="java.lang.String"column="book_name"></property><property name="price" type="java.lang.Float"column="price"></property><!-- table:代表的是中间表name:书籍类的关联属性inverse:中间表交于对方维护key:当前类对应的表列段在中间表(t_hibernate_book_category)中的外键(bid)many-to-many:column:对应的是上面key查出来的中间表(t_hibernate_book_category)的另一个字段(cid)，当做关联表的主键(category_id)进行查询class:上述查出来的主键对应的实体类流程：已查询book_id=1圣墟这本书为例1、通多建模反射自动生成sql，可以拿到book_id=8这条记录的基本信息{book_id=1，book_name=西游记，price=50}2、book_id=1->bid=1去查询中间表(t_hibernate_book_category)拿到了cid=1,23、cid=1,2->t_hibernate_book_category的category_id=1,24、拿到了当前book实例对应的category的集合5、最终{book_id=1，book_name=西游记，price=50}->{book_id=1，book_name=西游记，price=50，categories=[categoryId=2, categoryName=神话], Category [categoryId=1, categoryName=古典]}--><set table="t_hibernate_book_category" name="categories" cascade="save-update" inverse="true"><!-- one --><key column="bid"></key><!-- many --><many-to-many column="cid" class="com.liuwenwu.four.entity.Category"></many-to-many></set></class>
</hibernate-mapping>

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN""http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<hibernate-mapping><class name="com.liuwenwu.four.entity.Category" table="t_hibernate_category"><id name="categoryId" type="java.lang.Integer" column="category_id"><generator class="increment" /></id><property name="categoryName" type="java.lang.String"column="category_name"></property><set table="t_hibernate_book_category" name="books" cascade="save-update" inverse="true"><key column="cid"></key><many-to-many column="bid" class="com.liuwenwu.four.entity.Book"></many-to-many></set></class>
</hibernate-mapping>

<!-- 多对多关联 -->
<mapping resource="com/liuwenwu/four/entity/Book.hbm.xml"/>
<mapping resource="com/liuwenwu/four/entity/Category.hbm.xml"/>

package com.liuwenwu.four.dao;import java.util.HashMap;
import java.util.List;
import java.util.Map;import org.hibernate.Hibernate;
import org.hibernate.Session;
import org.hibernate.Transaction;
import org.hibernate.query.Query;import com.liuwenwu.four.entity.Book;
import com.liuwenwu.four.entity.Category;
import com.liuwenwu.two.util.SessionFactoryUtils;import antlr.StringUtils;public class BookDao{public Integer addBook(Book book) {Session session = SessionFactoryUtils.openSession();Transaction transaction = session.beginTransaction();Integer bid = (Integer) session.save(book);transaction.commit();session.close();return bid;}public Integer addCategory(Category category) {Session session = SessionFactoryUtils.openSession();Transaction transaction = session.beginTransaction();Integer cid = (Integer) session.save(category);transaction.commit();session.close();return cid;}public Category getCategory(Category category) {Session session = SessionFactoryUtils.openSession();Transaction transaction = session.beginTransaction();Category c = session.get(Category.class, category.getCategoryId());transaction.commit();session.close();return c;}public Book getBook(Book book) {Session session = SessionFactoryUtils.openSession();Transaction transaction = session.beginTransaction();Book b = session.get(Book.class, book.getBookId());if (b != null && new Integer(1).equals(book.getInitCategories())) {Hibernate.initialize(b.getCategories());}transaction.commit();session.close();return b;}public void delBook(Book book) {Session session = SessionFactoryUtils.openSession();Transaction transaction = session.beginTransaction();session.delete(book);transaction.commit();session.close();}public void delCategory(Category category) {Session session = SessionFactoryUtils.openSession();Transaction transaction = session.beginTransaction();Category c = session.get(Category.class, category.getCategoryId());if(c!=null) {for (Book b : c.getBooks()) {
//                通过在被控方通过主控方来解除关联关系，最后被控方再做删除
                b.getCategories().remove(c);}}session.delete(c);transaction.commit();session.close();}
}

package com.liuwenwu.four.dao;
import org.junit.Test;
import com.liuwenwu.four.entity.Book;
import com.liuwenwu.four.entity.Category;public class BookDaoTest {private BookDao bookDao = new BookDao();@Testpublic void testGetBook() {Book book = new Book();book.setBookId(1);book.setInitCategories(1);Book b = this.bookDao.getBook(book );System.out.println(b.getBookName());System.out.println(b.getCategories());}/*** book.hbm.xml    inverse=fasle* category.hbm.xml inverse=true* 数据添加正常* 书籍表、桥接表各新增一条数据(级联新增)*/@Testpublic void test1() {Book book = new Book();book.setBookName("少年阿宾2");book.setPrice(10f);Category category = new Category();category.setCategoryId(5);
//        直接将category对象加入到新建的book中是错误的，因为此时的category是临时态的，hibernate是不会管理的
//        book.getCategories().add(category);Category c = this.bookDao.getCategory(category);//        c.getBooks().add(book);
        book.getCategories().add(c);this.bookDao.addBook(book);}/*** book.hbm.xml    inverse=true* category.hbm.xml inverse=true* 只增加书籍表数据* 桥接表不加数据* 原因：双方都没有去维护关系*/@Testpublic void test2() {Book book = new Book();book.setBookName("诡秘之主");book.setPrice(99f);Category category = new Category();category.setCategoryId(4);Category c = this.bookDao.getCategory(category);book.getCategories().add(c);this.bookDao.addBook(book);
//        c.getBooks().add(book);
    }
}

    /*** 联级查询*/@Testpublic void testGetBook() {Book book = new Book();book.setBookId(1);book.setInitCategories(1);Book b = this.bookDao.getBook(book );System.out.println(b.getBookName());System.out.println(b.getCategories());}

西游记
[Category [categoryId=2, categoryName=神话], Category [categoryId=1, categoryName=古典]]

    /*** book.hbm.xml    inverse=fasle* category.hbm.xml inverse=true* 数据添加正常* 书籍表、桥接表各新增一条数据(级联新增)*/@Testpublic void test1() {Book book = new Book();book.setBookName("少年阿宾2");book.setPrice(10f);Category category = new Category();category.setCategoryId(5);
//        直接将category对象加入到新建的book中是错误的，因为此时的category是临时态的，hibernate是不会管理的
//        book.getCategories().add(category);Category c = this.bookDao.getCategory(category);//        c.getBooks().add(book);
        book.getCategories().add(c);this.bookDao.addBook(book);}