1、建立一个实体类
package hibernate; import java.util.HashSet; import java.util.Set; public class Customer { private Integer cid; private String custName; private String custLevel; private String custSource; private String custMobile; //一对多的那个类，hibernate要求用Set private Set<LinkMan> setLinkMan = new HashSet<LinkMan>(); public Set<LinkMan> getSetLinkMan() { return setLinkMan; } public void setSetLinkMan(Set<LinkMan> setLinkMan) { this.setLinkMan = setLinkMan; } public Integer getCid() { return cid; } public void setCid(Integer cid) { this.cid = cid; } public String getCustName() { return custName; } public void setCustName(String custName) { this.custName = custName; } public String getCustLevel() { return custLevel; } public void setCustLevel(String custLevel) { this.custLevel = custLevel; } public String getCustSource() { return custSource; } public void setCustSource(String custSource) { this.custSource = custSource; } public String getCustMobile() { return custMobile; } public void setCustMobile(String custMobile) { this.custMobile = custMobile; } }2、建立另外一个实体类
package hibernate; public class LinkMan { private Integer lkm_id; private String lkm_name; private String lkm_gender; private String lkm_phone; //和它有多对一关系的类 private Customer customer; public Customer getCustomer() { return customer; } public void setCustomer(Customer customer) { this.customer = customer; } public Integer getLkm_id() { return lkm_id; } public void setLkm_id(Integer lkm_id) { this.lkm_id = lkm_id; } public String getLkm_name() { return lkm_name; } public void setLkm_name(String lkm_name) { this.lkm_name = lkm_name; } public String getLkm_gender() { return lkm_gender; } public void setLkm_gender(String lkm_gender) { this.lkm_gender = lkm_gender; } public String getLkm_phone() { return lkm_phone; } public void setLkm_phone(String lkm_phone) { this.lkm_phone = lkm_phone; } }3、一个类的映射关系xml
<?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="hibernate.Customer" table="customer"> <id name="cid" column="cid"> <generator class="native"></generator> </id> <property name="custName" column="custName"></property> <property name="custLevel" column="custLevel"></property> <property name="custSource" column="custSource"></property> <property name="custMobile" column="custMobile"></property> <set name="setLinkMan"> <!-- column是外键名称 --> <key column="clid"></key> <one-to-many class="hibernate.LinkMan" /> </set> </class> </hibernate-mapping>4、另外一个类的映射关系xml
<?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="hibernate.LinkMan" table="linkMan"> <id name="lkm_id" column="lkm_id"> <generator class="native"></generator> </id> <property name="lkm_name" column="lkm_name"></property> <property name="lkm_gender" column="lkm_gender"></property> <property name="lkm_phone" column="lkm_phone"></property> <many-to-one name="customer" class="hibernate.Customer" column="clid"> </many-to-one> </class> </hibernate-mapping>5、核心配置文件xml
<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN" "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd"> <hibernate-configuration> <session-factory> <!-- 1、配置数据库信息 --> <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property> <property name="hibernate.connection.url">jdbc:mysql:///hibernate</property> <property name="hibernate.connection.username">root</property> <property name="hibernate.connection.password">root</property> <!-- 2、配置hibernate信息 可选的--> <!-- 输出底层sql语句 --> <property name="hibernate.show_sql">true</property> <!-- 对底层sql语句格式化 --> <property name="hibernate.format_sql">true</property> <!-- hibernate帮创建表 update：如果已经有表，更新，如果没有，创建--> <property name="hibernate.hbm2ddl.auto">update</property> <!-- 配置数据库方言 让hibernate识别不同数据库语句--> <property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property> <!-- 3、把映射文件放到核心配置文件中 --> <mapping resource="hibernate/Customer.hbm.xml"></mapping> <mapping resource="hibernate/LinkMan.hbm.xml"></mapping> </session-factory> </hibernate-configuration>6、测试文件
package hibernate; import org.hibernate.Session; import org.hibernate.SessionFactory; import org.hibernate.cfg.Configuration; import org.junit.Test; public class TestHibernate { @Test public void test() { //1、加载hibernate核心配置文件 Configuration cfg = new Configuration(); cfg.configure(); //2、创建SessionFactory对象 //读取核心配置文件，创建sessionFactory //根据映射关系创建表 SessionFactory sessionFacroty = cfg.buildSessionFactory(); //3、创建session对象 //类似于创建连接 Session session = sessionFacroty.openSession(); //4、开启事务 org.hibernate.Transaction tx = session.beginTransaction(); //5、写具体crud操作 Customer customer = new Customer(); customer.setCustName("百度"); customer.setCustLevel("vip"); customer.setCustSource("网络"); customer.setCustMobile("999"); LinkMan linkMan = new LinkMan(); linkMan.setLkm_name("lucy"); linkMan.setLkm_gender("男"); linkMan.setLkm_phone("911"); //建立级联关系！ customer.getSetLinkMan().add(linkMan); linkMan.setCustomer(customer); session.save(customer); session.save(linkMan); //6、提交事务 tx.commit(); //7、关闭资源 session.close(); sessionFacroty.close(); } } 转载请标明出处:Hibernate一对多+级联操作
文章来源: Hibernate一对多+级联操作