所有项目导入对应的hibernate的jar包、mysql的jar包和添加每次都需要用到的HibernateUtil.java
第一节:基本类型映射
例子:
hibernate.cfg.xml
1 <?xml version=‘1.0‘ encoding=‘utf-8‘?> 2 <!DOCTYPE hibernate-configuration PUBLIC 3 "-//Hibernate/Hibernate Configuration DTD 3.0//EN" 4 "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd"> 5 6 <hibernate-configuration> 7 8 <session-factory> 9 10 <!--数据库连接设置 --> 11 <property name="connection.driver_class">com.mysql.jdbc.Driver</property> 12 <property name="connection.url">jdbc:mysql://localhost:3306/hibernate</property> 13 <property name="connection.username">root</property> 14 <property name="connection.password">123456</property> 15 16 17 <!-- 方言 --> 18 <property name="dialect">org.hibernate.dialect.MySQL5Dialect</property> 19 20 <!-- 控制台显示SQL --> 21 <property name="show_sql">true</property> 22 23 <!-- 自动更新表结构 --> 24 <property name="hbm2ddl.auto">update</property> 25 26 <mapping resource="com/wishwzp/model/Student.hbm.xml"/> 27 28 <mapping resource="com/wishwzp/model/Book.hbm.xml"/> 29 30 </session-factory> 31 32 </hibernate-configuration>
Book.java
1 package com.wishwzp.model; 2 3 import java.sql.Blob; 4 import java.util.Date; 5 6 public class Book { 7 8 private int id; 9 private String bookName; // 图书名称 10 private float price; // 图书价格 11 private boolean specialPrice; // 是否是特价 12 private Date publishDate; // 发布日期 13 private String author; // 作者 14 private String introduction; // 简介 15 private Blob bookPic; // 图书图片 16 17 public int getId() { 18 return id; 19 } 20 public void setId(int id) { 21 this.id = id; 22 } 23 public String getBookName() { 24 return bookName; 25 } 26 public void setBookName(String bookName) { 27 this.bookName = bookName; 28 } 29 public float getPrice() { 30 return price; 31 } 32 public void setPrice(float price) { 33 this.price = price; 34 } 35 public boolean isSpecialPrice() { 36 return specialPrice; 37 } 38 public void setSpecialPrice(boolean specialPrice) { 39 this.specialPrice = specialPrice; 40 } 41 public Date getPublishDate() { 42 return publishDate; 43 } 44 public void setPublishDate(Date publishDate) { 45 this.publishDate = publishDate; 46 } 47 public String getAuthor() { 48 return author; 49 } 50 public void setAuthor(String author) { 51 this.author = author; 52 } 53 public String getIntroduction() { 54 return introduction; 55 } 56 public void setIntroduction(String introduction) { 57 this.introduction = introduction; 58 } 59 public Blob getBookPic() { 60 return bookPic; 61 } 62 public void setBookPic(Blob bookPic) { 63 this.bookPic = bookPic; 64 } 65 66 67 68 }
Book.hbm.xml
1 <?xml version="1.0"?> 2 <!DOCTYPE hibernate-mapping PUBLIC 3 "-//Hibernate/Hibernate Mapping DTD 3.0//EN" 4 "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd"> 5 6 <hibernate-mapping package="com.wishwzp.model"> 7 8 <class name="Book" table="t_book"> 9 <id name="id" column="bookId"> 10 <generator class="native"></generator> 11 </id> 12 13 <property name="bookName" column="bookName" length="40"></property> 14 <property name="price" column="price" type="float"></property> 15 <property name="specialPrice" column="specialPrice" type="boolean"></property> 16 <property name="publishDate" column="publishDate" type="date"></property> 17 <property name="author" column="author" length="20"></property> 18 <property name="introduction" column="introduction" type="text"></property> 19 <property name="bookPic" column="bookPic" type="blob"></property> 20 </class> 21 22 </hibernate-mapping>
BookTest.java
1 package com.wishwzp.service; 2 3 import java.io.FileInputStream; 4 import java.io.InputStream; 5 import java.sql.Blob; 6 import java.text.SimpleDateFormat; 7 8 import org.hibernate.LobHelper; 9 import org.hibernate.Session; 10 import org.hibernate.SessionFactory; 11 12 import com.wishwzp.model.Book; 13 import com.wishwzp.util.HibernateUtil; 14 15 public class BookTest { 16 17 public static void main(String[] args) throws Exception{ 18 SessionFactory sessionFactory=HibernateUtil.getSessionFactory(); 19 Session session=sessionFactory.openSession(); // 生成一个session 20 session.beginTransaction(); // 开启事务 21 22 Book book=new Book(); 23 book.setBookName("java编程思想"); 24 book.setPrice(100); 25 book.setSpecialPrice(true); 26 book.setPublishDate(new SimpleDateFormat("yyyy-MM-dd").parse("2013-1-1")); 27 book.setAuthor("埃克尔"); 28 book.setIntroduction("简介..."); 29 30 // 31 LobHelper lobHelper=session.getLobHelper(); 32 InputStream in=new FileInputStream("c://java编程思想.jpg"); 33 Blob bookPic=lobHelper.createBlob(in, in.available()); 34 book.setBookPic(bookPic); 35 36 session.save(book); 37 38 session.getTransaction().commit(); // 提交事务 39 session.close(); // 关闭session 40 41 } 42 }
HibernateUtil.java
1 package com.wishwzp.util; 2 3 import org.hibernate.SessionFactory; 4 import org.hibernate.boot.registry.StandardServiceRegistryBuilder; 5 import org.hibernate.cfg.Configuration; 6 import org.hibernate.service.ServiceRegistry; 7 8 /** 9 * 10 * hibernate封装 11 * @author wishwzp 12 * 13 */ 14 public class HibernateUtil { 15 16 private static final SessionFactory sessionFactory=buildSessionFactory(); 17 18 /** 19 * 绑定SessionFactory 20 * @return 21 */ 22 private static SessionFactory buildSessionFactory(){ 23 // 实例化配置文件 24 Configuration configuration=new Configuration().configure(); 25 // 实例化服务登记 26 ServiceRegistry serviceRegistry=new StandardServiceRegistryBuilder().applySettings(configuration.getProperties()).build(); 27 //获取Session工厂 28 return configuration.buildSessionFactory(serviceRegistry); 29 } 30 31 public static SessionFactory getSessionFactory(){ 32 return sessionFactory; 33 } 34 }
第二节:集合类型映射
hibernate.cfg.xml
1 <?xml version=‘1.0‘ encoding=‘utf-8‘?> 2 <!DOCTYPE hibernate-configuration PUBLIC 3 "-//Hibernate/Hibernate Configuration DTD 3.0//EN" 4 "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd"> 5 6 <hibernate-configuration> 7 8 <session-factory> 9 10 <!--数据库连接设置 --> 11 <property name="connection.driver_class">com.mysql.jdbc.Driver</property> 12 <property name="connection.url">jdbc:mysql://localhost:3306/hibernate</property> 13 <property name="connection.username">root</property> 14 <property name="connection.password">123456</property> 15 16 17 <!-- 方言 --> 18 <property name="dialect">org.hibernate.dialect.MySQL5Dialect</property> 19 20 <!-- 控制台显示SQL --> 21 <property name="show_sql">true</property> 22 23 <!-- 自动更新表结构 --> 24 <property name="hbm2ddl.auto">update</property> 25 26 <mapping resource="com/wishwzp/model/Student.hbm.xml"/> 27 <mapping resource="com/wishwzp/model/Student2.hbm.xml"/> 28 <mapping resource="com/wishwzp/model/Student3.hbm.xml"/> 29 <mapping resource="com/wishwzp/model/Student4.hbm.xml"/> 30 31 </session-factory> 32 33 </hibernate-configuration>
1,Set 无序元素不可重复
Student.java
1 package com.wishwzp.model; 2 3 import java.util.Set; 4 5 public class Student { 6 7 private long id; 8 private String name; 9 private Set<String> images; 10 11 public long getId() { 12 return id; 13 } 14 public void setId(long id) { 15 this.id = id; 16 } 17 public String getName() { 18 return name; 19 } 20 public void setName(String name) { 21 this.name = name; 22 } 23 public Set<String> getImages() { 24 return images; 25 } 26 public void setImages(Set<String> images) { 27 this.images = images; 28 } 29 30 31 32 33 }
Student.hbm.xml
1 <?xml version="1.0"?> 2 <!DOCTYPE hibernate-mapping PUBLIC 3 "-//Hibernate/Hibernate Mapping DTD 3.0//EN" 4 "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd"> 5 6 <hibernate-mapping package="com.wishwzp.model"> 7 8 <class name="Student" table="t_student"> 9 <id name="id" column="stuId"> 10 <generator class="native"></generator> 11 </id> 12 13 <property name="name" column="stuName"></property> 14 15 <set name="images" table="t_image"> 16 <key column="studentId"></key> 17 <element column="imageName" type="string"></element> 18 </set> 19 </class> 20 21 </hibernate-mapping>
2,List 有序元素可重复
Studnet2.java
1 package com.wishwzp.model; 2 3 import java.util.List; 4 5 public class Student2 { 6 7 private long id; 8 private String name; 9 private List<String> images; 10 11 public long getId() { 12 return id; 13 } 14 public void setId(long id) { 15 this.id = id; 16 } 17 public String getName() { 18 return name; 19 } 20 public void setName(String name) { 21 this.name = name; 22 } 23 public List<String> getImages() { 24 return images; 25 } 26 public void setImages(List<String> images) { 27 this.images = images; 28 } 29 30 }
Student2.hbm.xml
1 <?xml version="1.0"?> 2 <!DOCTYPE hibernate-mapping PUBLIC 3 "-//Hibernate/Hibernate Mapping DTD 3.0//EN" 4 "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd"> 5 6 <hibernate-mapping package="com.wishwzp.model"> 7 8 <class name="Student2" table="t_student"> 9 <id name="id" column="stuId"> 10 <generator class="native"></generator> 11 </id> 12 13 <property name="name" column="stuName"></property> 14 15 <list name="images" table="t_image2"> 16 <key column="studentId"></key> 17 <list-index column="imageIndex"></list-index> 18 <element column="imageName" type="string"></element> 19 </list> 20 </class> 21 22 </hibernate-mapping>
3,Bag 无序元素可重复
Student3.java
1 package com.wishwzp.model; 2 3 import java.util.List; 4 5 public class Student3 { 6 7 private long id; 8 private String name; 9 private List<String> images; 10 11 public long getId() { 12 return id; 13 } 14 public void setId(long id) { 15 this.id = id; 16 } 17 public String getName() { 18 return name; 19 } 20 public void setName(String name) { 21 this.name = name; 22 } 23 public List<String> getImages() { 24 return images; 25 } 26 public void setImages(List<String> images) { 27 this.images = images; 28 } 29 30 }
Student3.hbm.xml
1 <?xml version="1.0"?> 2 <!DOCTYPE hibernate-mapping PUBLIC 3 "-//Hibernate/Hibernate Mapping DTD 3.0//EN" 4 "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd"> 5 6 <hibernate-mapping package="com.wishwzp.model"> 7 8 <class name="Student3" table="t_student"> 9 <id name="id" column="stuId"> 10 <generator class="native"></generator> 11 </id> 12 13 <property name="name" column="stuName"></property> 14 15 <idbag name="images" table="t_image3"> 16 <collection-id type="long" column="imageId"> 17 <generator class="increment"></generator> 18 </collection-id> 19 <key column="studentId"></key> 20 <element column="imageName" type="string"></element> 21 </idbag> 22 23 24 </class> 25 26 </hibernate-mapping>
4,Map 键值对
Student4.java
1 package com.wishwzp.model; 2 3 import java.util.Map; 4 5 public class Student4 { 6 7 private long id; 8 private String name; 9 private Map<String,String> images; 10 11 public long getId() { 12 return id; 13 } 14 public void setId(long id) { 15 this.id = id; 16 } 17 public String getName() { 18 return name; 19 } 20 public void setName(String name) { 21 this.name = name; 22 } 23 public Map<String, String> getImages() { 24 return images; 25 } 26 public void setImages(Map<String, String> images) { 27 this.images = images; 28 } 29 30 }
Student4.hbm.xml
1 <?xml version="1.0"?> 2 <!DOCTYPE hibernate-mapping PUBLIC 3 "-//Hibernate/Hibernate Mapping DTD 3.0//EN" 4 "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd"> 5 6 <hibernate-mapping package="com.wishwzp.model"> 7 8 <class name="Student4" table="t_student"> 9 <id name="id" column="stuId"> 10 <generator class="native"></generator> 11 </id> 12 13 <property name="name" column="stuName"></property> 14 15 <map name="images" table="t_image4"> 16 <key column="studentId"></key> 17 <map-key column="imageKey" type="string"></map-key> 18 <element column="imageName" type="string"></element> 19 </map> 20 21 22 </class> 23 24 </hibernate-mapping>
上面4种情况的总测试类:
StudentTest.java
1 package com.wishwzp.service; 2 3 import java.util.ArrayList; 4 import java.util.HashMap; 5 import java.util.HashSet; 6 import java.util.Iterator; 7 import java.util.List; 8 import java.util.Map; 9 import java.util.Set; 10 11 import org.hibernate.Session; 12 import org.hibernate.SessionFactory; 13 import org.junit.After; 14 import org.junit.Before; 15 import org.junit.Test; 16 17 import com.wishwzp.model.Student; 18 import com.wishwzp.model.Student2; 19 import com.wishwzp.model.Student3; 20 import com.wishwzp.model.Student4; 21 import com.wishwzp.util.HibernateUtil; 22 23 public class StudentTest { 24 25 private SessionFactory sessionFactory=HibernateUtil.getSessionFactory(); 26 private Session session; 27 28 @Before 29 public void setUp() throws Exception { 30 session=sessionFactory.openSession(); // 生成一个session 31 session.beginTransaction(); // 开启事务 32 } 33 34 @After 35 public void tearDown() throws Exception { 36 session.getTransaction().commit(); // 提交事务 37 session.close(); // 关闭session 38 } 39 40 //1、Set 无序元素不可重复 41 @Test 42 public void testSetSave(){ 43 Set<String> imageSet=new HashSet<String>(); 44 imageSet.add("image1.png"); 45 imageSet.add("image2.png"); 46 imageSet.add("image3.png"); 47 imageSet.add("image3.png");//这里有重复,但在数据库里面只有一个image3.png并且是无序的。。。所以set元素不可重复 48 49 Student s1=new Student(); 50 s1.setImages(imageSet); 51 session.save(s1); 52 } 53 54 //打印出来Student表id为1的images表的所有image信息 55 @Test 56 public void testSetFetch(){ 57 Student student=(Student)session.get(Student.class, Long.valueOf(1)); 58 Iterator it=student.getImages().iterator(); 59 while(it.hasNext()){ 60 System.out.println(it.next()); 61 } 62 } 63 64 //2、List 有序元素可重复 65 @Test 66 public void testListSave(){ 67 List<String> imageList=new ArrayList<String>(); 68 imageList.add("image1.png"); 69 imageList.add("image2.png"); 70 imageList.add("image3.png"); 71 imageList.add("image3.png");//这里有重复,数据库里面也可以有两个image3.png并且是有序的。。。所以list元素可重复 72 73 Student2 s2=new Student2(); 74 s2.setImages(imageList); 75 session.save(s2); 76 } 77 78 //打印出来Student表id为1的images表的所有image信息 79 @Test 80 public void testListFetch(){ 81 Student2 student2=(Student2)session.get(Student2.class, Long.valueOf(2)); 82 Iterator it=student2.getImages().iterator(); 83 while(it.hasNext()){ 84 System.out.println(it.next()); 85 } 86 } 87 88 //3、Bag 无序元素可重复 89 @Test 90 public void testBagSave(){ 91 List<String> imageList=new ArrayList<String>(); 92 imageList.add("image1.png"); 93 imageList.add("image2.png"); 94 imageList.add("image3.png"); 95 imageList.add("image3.png");//这里有重复,数据库里面也有两个image3.png而且是无序的。。。所以Bag 无序元素可重复 96 97 Student3 s3=new Student3(); 98 s3.setImages(imageList); 99 session.save(s3); 100 } 101 102 103 @Test 104 public void testBagFetch(){ 105 Student3 student3=(Student3)session.get(Student3.class, Long.valueOf(3)); 106 Iterator it=student3.getImages().iterator(); 107 while(it.hasNext()){ 108 System.out.println(it.next()); 109 } 110 } 111 112 //4、Map 键值对 113 @Test 114 public void testMapSave(){ 115 Map<String,String> imageMap=new HashMap<String,String>(); 116 imageMap.put("i1", "image1.png"); 117 imageMap.put("i2", "image2.png"); 118 imageMap.put("i3", "image3.png"); 119 imageMap.put("i4", "image4.png");//这里都是键值对的 120 121 Student4 s4=new Student4(); 122 s4.setImages(imageMap); 123 session.save(s4); 124 } 125 126 127 @Test 128 public void testMapFetch(){ 129 Student4 student4=(Student4)session.get(Student4.class, Long.valueOf(4)); 130 Map<String,String> imageMap=student4.getImages(); 131 Set keys=imageMap.keySet(); 132 Iterator it=keys.iterator(); 133 while(it.hasNext()){ 134 String key=(String)it.next(); 135 System.out.println(key+":"+imageMap.get(key)); 136 } 137 } 138 139 }
结果显示:
1,Set 无序元素不可重复
testSetSave()方法:
testSetFech()方法:
2,List 有序元素可重复
testListSave()方法:
testListFech()方法:
3,Bag 无序元素可重复
testBagSave()方法:
testBagFech()方法:
4,Map 键值对
testMapSave()方法:
testMapFech()方法:
所有表之间的关系:
时间: 2024-10-11 20:39:19