Hibernate第五天

最新推荐文章于 2025-07-28 23:27:29 发布

原创最新推荐文章于 2025-07-28 23:27:29 发布 · 264 阅读

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#hibernate #string #generator #class #encoding #table

一对一（单项，双向）一对多（单项，双向）多对多

先看列子一对一

PO类

package com.lovo.po; public class HusbandPO { private int id; private String name; private WifePO myWife; 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 WifePO getMyWife() { return myWife; } public void setMyWife(WifePO myWife) { this.myWife = myWife; } }

package com.lovo.po; public class WifePO { private int id; private String name; private HusbandPO myMan; 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 HusbandPO getMyMan() { return myMan; } public void setMyMan(HusbandPO myMan) { this.myMan = myMan; } }

package com.lovo.po; public class FatherPO { private int id; private String name; private SonPO mySon; 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 SonPO getMySon() { return mySon; } public void setMySon(SonPO mySon) { this.mySon = mySon; } }

package com.lovo.po; public class SonPO { private int id; private String name; private FatherPO myDad; 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 FatherPO getMyDad() { return myDad; } public void setMyDad(FatherPO myDad) { this.myDad = myDad; } }

bhm文件

<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd" > <hibernate-mapping> <class name="com.lovo.po.FatherPO" table="t_father"> <id name="id" column="f_id" type="int"> <generator class="increment"></generator> </id> <property name="name" column="f_name" type="string"></property> <one-to-one name="mySon" class="com.lovo.po.SonPO" property-ref="myDad" cascade="all"> </one-to-one> </class> </hibernate-mapping>

<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd" > <hibernate-mapping> <class name="com.lovo.po.SonPO" table="t_son"> <id name="id" column="f_id" type="int"> <generator class="increment"></generator> </id> <property name="name" column="f_name" type="string"></property> <many-to-one name="myDad" class="com.lovo.po.FatherPO" unique="true" column="f_fatherid" cascade="all"> </many-to-one> </class> </hibernate-mapping>

<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd" > <hibernate-mapping> <class name="com.lovo.po.HusbandPO" table="t_husband"> <id name="id" column="f_id" type="int"> <generator class="increment"></generator> </id> <property name="name" column="f_name" type="string"></property> <one-to-one name="myWife" cascade="all" class="com.lovo.po.WifePO"></one-to-one> </class> </hibernate-mapping>

<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd" > <hibernate-mapping> <class name="com.lovo.po.WifePO" table="t_wife"> <id name="id" column="f_id" type="int"> <generator class="foreign"> <param name="property">myMan</param> </generator> </id> <property name="name" column="f_name" type="string"></property> <one-to-one name="myMan" class="com.lovo.po.HusbandPO"></one-to-one> </class> </hibernate-mapping>

Main

package com.lovo.test; import org.hibernate.criterion.DetachedCriteria; import org.hibernate.criterion.Order; import org.hibernate.criterion.Restrictions; import com.lovo.po.FatherPO; import com.lovo.po.SonPO; public class TestMain { public static void main(String[] args) { //一对一主键关联 HusbandPO he = new HusbandPO(); WifePO she = new WifePO(); he.setName("ZG"); she.setName("SS"); dao.marry(he, she); //一对一唯一外键关联 FatherPO me = new FatherPO(); SonPO you = new SonPO(); me.setName("谢贤"); you.setName("谢霆锋"); dao.born(me, you); } }

一对多

PO类：

package com.lovo.po; import java.util.HashSet; import java.util.Set; public class MotherPO { private int id; private String name; private Set children = new HashSet(); 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 getChildren() { return children; } public void setChildren(Set children) { this.children = children; } }

package com.lovo.po; public class ChildPO { private int id; private String name; private MotherPO mum; 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 MotherPO getMum() { return mum; } public void setMum(MotherPO mum) { this.mum = mum; } }

HBM文件

<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd" > <hibernate-mapping> <class name="com.lovo.po.ChildPO" table="t_children"> <id name="id" column="f_id" type="int"> <generator class="increment"></generator> </id> <property name="name" column="f_name" type="string"></property> <many-to-one name="mum" cascade="all" class="com.lovo.po.MotherPO" column="f_motherid"></many-to-one> </class> </hibernate-mapping>

<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd" > <hibernate-mapping> <class name="com.lovo.po.MotherPO" table="t_mother"> <id name="id" column="f_id" type="int"> <generator class="increment"></generator> </id> <property name="name" column="f_name" type="string"></property> <set name="children" table="t_children" inverse="true" cascade="all"> <key column="f_motherid"></key> <one-to-many class="com.lovo.po.ChildPO"/> </set> </class> </hibernate-mapping>

Main

package com.lovo.test; import org.hibernate.criterion.DetachedCriteria; import org.hibernate.criterion.Order; import org.hibernate.criterion.Restrictions; import com.lovo.dao.UserDAO; import com.lovo.po.ChildPO; import com.lovo.po.HusbandPO; import com.lovo.po.MotherPO; import com.lovo.po.SonPO; import com.lovo.po.WifePO; public class TestMain { /** * @param args */ public static void main(String[] args) { // TODO Auto-generated method stub UserPO user = new UserPO(); //一对多单向 MotherPO mum = new MotherPO(); ChildPO c1 = new ChildPO(); ChildPO c2 = new ChildPO(); mum.setName("徐妈妈"); c1.setName("bigS"); c2.setName("smallS"); mum.getChildren().add(c1); mum.getChildren().add(c2); dao.bornAgain(mum); //一对多双向 MotherPO mum = new MotherPO(); ChildPO c1 = new ChildPO(); ChildPO c2 = new ChildPO(); mum.setName("芙蓉姐姐"); c1.setName("春哥"); c2.setName("曾哥"); mum.getChildren().add(c1); mum.getChildren().add(c2); c1.setMum(mum); c2.setMum(mum); dao.bornAgain(c1); } }

多对多：

PO类：

package com.lovo.po; import java.util.HashSet; import java.util.Set; public class EmployeePO { private int id; private String name; private Set roleSet = new HashSet(); 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 getRoleSet() { return roleSet; } public void setRoleSet(Set roleSet) { this.roleSet = roleSet; } }

package com.lovo.po; import java.util.HashSet; import java.util.Set; public class RolePO { private int id; private String name; private Set employeeSet = new HashSet(); 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 getEmployeeSet() { return employeeSet; } public void setEmployeeSet(Set employeeSet) { this.employeeSet = employeeSet; } }

XML文件

<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd" > <hibernate-mapping> <class name="com.lovo.po.EmployeePO" table="t_employee"> <id name="id" column="f_id" type="int"> <generator class="increment"></generator> </id> <property name="name" column="f_name" type="string"></property> <set name="roleSet" table="t_employee_role" inverse="true" cascade="all"> <key column="f_employeeid"></key> <many-to-many class="com.lovo.po.RolePO" column="f_roleid"/> </set> </class> </hibernate-mapping>

<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd" > <hibernate-mapping> <class name="com.lovo.po.RolePO" table="t_role"> <id name="id" column="f_id" type="int"> <generator class="increment"></generator> </id> <property name="name" column="f_name" type="string"></property> <set name="employeeSet" table="t_employee_role" inverse="false" cascade="all"> <key column="f_roleid"></key> <many-to-many class="com.lovo.po.EmployeePO" column="f_employeeid"/> </set> </class> </hibernate-mapping>

Main

package com.lovo.test; import org.hibernate.criterion.DetachedCriteria; import org.hibernate.criterion.Order; import org.hibernate.criterion.Restrictions; import com.lovo.dao.UserDAO; import com.lovo.po.EmployeePO; import com.lovo.po.RolePO; public class TestMain { /** * @param args */ public static void main(String[] args) { //多对多 EmployeePO e1 = new EmployeePO(); EmployeePO e2 = new EmployeePO(); RolePO r1 = new RolePO(); RolePO r2 = new RolePO(); e1.setName("刘德华"); e2.setName("梁朝伟"); r1.setName("警察"); r2.setName("古惑仔"); e1.getRoleSet().add(r1); e1.getRoleSet().add(r2); e2.getRoleSet().add(r1); r1.getEmployeeSet().add(e1); r1.getEmployeeSet().add(e2); r2.getEmployeeSet().add(e1); dao.hair(e1, e2, r1, r2); } }