Hibernate中联合主键映射时有一个也是外键的一种解决方法
2012-05-03 11:47
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一个联合主键的问题，困扰了我很久，最后发现《Hibernate in Action》里有讲到，因为在实际环境中老是报错，也不知配置的对不对，然后回家写了一个DEMO，发现可以保存。
表结构大致如下：
ITEM(ID,NAME)其中id是PK
CATEGORY(ID,NAME)，其中ID是PK
CATEGORY_ITEM(ITEM_ID,CATEGORY_ID,THIRD_ID,ADDED_DATE),其中ITEM_ID,CATEGORY_ID分别是ITEM和CATEGORY的外键，而他们与THIRD_ID一起组成CATETORY_ITEM表的联合主键。
下面给出具体实现：
一、Item.java
Java代码
/**
* @author Terrence
*
*/
public class Item
implements Serializable {
/**
*
*/
private static
final long serialVersionUID = 1L;
private Integer id;
private String name;
private Set<CategorizedItem> categorizedItems =
new HashSet<CategorizedItem>();
/**
*
*/
public Item() {
super();
}
/**
* @return the id
*/
public Integer getId() {
return id;
}
/**
* @param id the id to set
*/
public void setId(Integer id) {
this.id = id;
}
/**
* @return the name
*/
public String getName() {
return name;
}
/**
* @param name the name to set
*/
public void setName(String name) {
this.name = name;
}
/**
* @return the categorizedItems
*/
public Set<CategorizedItem> getCategorizedItems() {
return categorizedItems;
}
/**
* @param categorizedItems the categorizedItems to set
*/
public void setCategorizedItems(Set<CategorizedItem> categorizedItems) {
this.categorizedItems = categorizedItems;
}
}
二、Category.java
Java代码
/**
* @author Terrence
*
*/
public class Category
implements Serializable {
/**
*
*/
private static
final long serialVersionUID = 1L;
private Integer id;
private String name;
private Set<CategorizedItem> categorizedItems =
new HashSet<CategorizedItem>();
public Category() {
super();
}
/**
* @return the id
*/
public Integer getId() {
return id;
}
/**
* @param id the id to set
*/
public void setId(Integer id) {
this.id = id;
}
/**
* @return the name
*/
public String getName() {
return name;
}
/**
* @param name the name to set
*/
public void setName(String name) {
this.name = name;
}
/**
* @return the categorizedItems
*/
public Set<CategorizedItem> getCategorizedItems() {
return categorizedItems;
}
/**
* @param categorizedItems the categorizedItems to set
*/
public void setCategorizedItems(Set<CategorizedItem> categorizedItems) {
this.categorizedItems = categorizedItems;
}
}
三、CategorizedItem.java
Java代码
/**
* @author Terrence
*
*/
public class CategorizedItem
implements Serializable {
/**
*
*/
private static
final long serialVersionUID = 1L;
public static
class Id implements Serializable {
/**
*
*/
private static
final long serialVersionUID = 1L;
private Integer thirdId;
private Integer categoryId;
private Integer itemId;
/**
*
*/
public Id() {
super();
}
/**
* @return the thirdId
*/
public Integer getThirdId() {
return thirdId;
}
/**
* @param thirdId the thirdId to set
*/
public void setThirdId(Integer thirdId) {
this.thirdId = thirdId;
}
/**
* @return the categoryId
*/
public Integer getCategoryId() {
return categoryId;
}
/**
* @param categoryId the categoryId to set
*/
public void setCategoryId(Integer categoryId) {
this.categoryId = categoryId;
}
/**
* @return the itemId
*/
public Integer getItemId() {
return itemId;
}
/**
* @param itemId the itemId to set
*/
public void setItemId(Integer itemId) {
this.itemId = itemId;
}
/* (non-Javadoc)
* @see java.lang.Object#hashCode()
*/
@Override
public int hashCode() {
return this.categoryId.hashCode()+this.itemId.hashCode();
}
/* (non-Javadoc)
* @see java.lang.Object#equals(java.lang.Object)
*/
@Override
public boolean equals(Object obj) {
if(obj!=null&&obj
instanceof Id){
Id that = (Id)obj;
return this.categoryId.equals(that.categoryId)&&this.itemId.equals(that.itemId);
}else{
return false;
}
}
}
private Id id = new Id();
private Date dateAdded;
private Item item;
private Category category;
/**
*
*/
public CategorizedItem() {
super();
}
/**
* @return the id
*/
public Id getId() {
return id;
}
/**
* @param id the id to set
*/
public void setId(Id id) {
this.id = id;
}
/**
* @return the dateAdded
*/
public Date getDateAdded() {
return dateAdded;
}
/**
* @param dateAdded the dateAdded to set
*/
public void setDateAdded(Date dateAdded) {
this.dateAdded = dateAdded;
}
/**
* @return the item
*/
public Item getItem() {
return item;
}
/**
* @param item the item to set
*/
public void setItem(Item item) {
this.item = item;
this.id.itemId = item.getId();
item.getCategorizedItems().add(this);
}
/**
* @return the category
*/
public Category getCategory() {
return category;
}
/**
* @param category the category to set
*/
public void setCategory(Category category) {
this.category = category;
this.id.categoryId = category.getId();
category.getCategorizedItems().add(this);
}
/**
* @return the thirdId
*/
public Integer getThirdId() {
return this.id.getThirdId();
}
/**
* @param thirdId the thirdId to set
*/
public void setThirdId(Integer thirdId) {
this.id.thirdId = thirdId;
}
}
四、*.hbm.xml,这里节省时间空间写在了一起
Java代码
<hibernate-mapping package="org.terrence.hrsystem.model">
<class name="Item" table="ITEM">
<id name="id" type="integer" column="ITEM_ID">
<generator class="identity" />
</id>
<property name="name" type="string" not-null="true"
update="false" column="ITEM_NAME" />
<set name="categorizedItems" cascade="all, delete-orphan"
inverse="true" lazy="false">
<key column="ITEM_ID" not-null="true" />
<one-to-many class="CategorizedItem" />
</set>
</class>
<class name="Category" table="CATEGORY">
<id name="id" type="integer" column="CATEGORY_ID">
<generator class="identity" />
</id>
<property name="name" type="string" column="CATEGORY_NAME" not-null="true"/>
<set name="categorizedItems" cascade="all, delete-orphan"
inverse="true" lazy="false">
<key column="CATEGORY_ID" not-null="true" />
<one-to-many class="CategorizedItem" />
</set>
</class>
<class name="Category" table="CATEGORY">
<id name="id" type="integer" column="CATEGORY_ID">
<generator class="identity" />
</id>
<class name="CategorizedItem" table="CATEGORIZED_ITEM" mutable="false">
<composite-id name="id" class="CategorizedItem$Id">
<key-property name="thirdId" column="THIRD_ID" type="integer"/>
<key-property name="categoryId" column="CATEGORY_ID"
type="integer" />
<key-property name="itemId" column="ITEM_ID" type="integer" />
</composite-id>
<property name="dateAdded" column="ADDED_ON" type="timestamp"
not-null="true" />
<many-to-one name="item" class="Item" column="ITEM_ID"
not-null="true" insert="false" update="false" />
<many-to-one name="category"
class="Category" column="CATEGORY_ID"
not-null="true" insert="false" update="false" />
</class>
</hibernate-mapping>
五、测试代码
Java代码
/**
* @Title: TestDao.java
* @Package test
* @Description: TODO(用一句话描述该文件做什么)
* @author Terrence.zhung chguxing@163.com
* @date 2011-3-29 上午02:45:05
* @version V1.0
*/
package test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.terrence.hrsystem.dao.CategorizedItemDao;
import org.terrence.hrsystem.dao.CategoryDao;
import org.terrence.hrsystem.dao.ItemDao;
import org.terrence.hrsystem.model.CategorizedItem;
import org.terrence.hrsystem.model.Category;
import org.terrence.hrsystem.model.Item;
/**
* @author Terrence
*
*/
public class TestDao {
/**
* @param args
*/
private static ItemDao itemDao;
private static CategoryDao categoryDao;
private static CategorizedItemDao categorizedItemDao;
private static ApplicationContext ctx;
public static
void init(){
if(ctx==null){
ctx = new ClassPathXmlApplicationContext(new String[]{"classpath:applicationContext.xml","classpath:daoContext.xml"});
}
itemDao = (ItemDao)ctx.getBean("itemDao");
categoryDao = (CategoryDao)ctx.getBean("categoryDao");
categorizedItemDao = (CategorizedItemDao)ctx.getBean("categorizedItemDao");
}
public static
void main(String[] args) throws Exception {
init();
saveItem();
saveCategory();
saveCategoryItem();
}
public static
void saveItem() throws Exception{
Item item = new Item();
item.setName("item2");
itemDao.save(item);
}
public static
void saveCategory() throws Exception{
Category category = new Category();
category.setName("category2");
categoryDao.save(category);
}
public static
void saveCategoryItem() throws Exception{
Item item = itemDao.get(1);
Category category = categoryDao.get(1);
CategorizedItem categorizedItem = new CategorizedItem();
categorizedItem.setItem(item);
categorizedItem.setCategory(category);
categorizedItem.setDateAdded(new java.util.Date());
categorizedItem.setThirdId(5);
categorizedItemDao.save(categorizedItem);
}
}
六、说明
因为用了spring，在配置文件配好环境，表可以用hibernate直接生成，不用写SQL语句。
表结构大致如下：
ITEM(ID,NAME)其中id是PK
CATEGORY(ID,NAME)，其中ID是PK
CATEGORY_ITEM(ITEM_ID,CATEGORY_ID,THIRD_ID,ADDED_DATE),其中ITEM_ID,CATEGORY_ID分别是ITEM和CATEGORY的外键，而他们与THIRD_ID一起组成CATETORY_ITEM表的联合主键。
下面给出具体实现：
一、Item.java
Java代码
/**
* @author Terrence
*
*/
public class Item
implements Serializable {
/**
*
*/
private static
final long serialVersionUID = 1L;
private Integer id;
private String name;
private Set<CategorizedItem> categorizedItems =
new HashSet<CategorizedItem>();
/**
*
*/
public Item() {
super();
}
/**
* @return the id
*/
public Integer getId() {
return id;
}
/**
* @param id the id to set
*/
public void setId(Integer id) {
this.id = id;
}
/**
* @return the name
*/
public String getName() {
return name;
}
/**
* @param name the name to set
*/
public void setName(String name) {
this.name = name;
}
/**
* @return the categorizedItems
*/
public Set<CategorizedItem> getCategorizedItems() {
return categorizedItems;
}
/**
* @param categorizedItems the categorizedItems to set
*/
public void setCategorizedItems(Set<CategorizedItem> categorizedItems) {
this.categorizedItems = categorizedItems;
}
}
/**
* @author Terrence
*
*/
public class Item implements Serializable {
/**
*
*/
private static final long serialVersionUID = 1L;
private Integer id;
private String name;
private Set<CategorizedItem> categorizedItems = new HashSet<CategorizedItem>();
/**
*
*/
public Item() {
super();
}
/**
* @return the id
*/
public Integer getId() {
return id;
}
/**
* @param id the id to set
*/
public void setId(Integer id) {
this.id = id;
}
/**
* @return the name
*/
public String getName() {
return name;
}
/**
* @param name the name to set
*/
public void setName(String name) {
this.name = name;
}
/**
* @return the categorizedItems
*/
public Set<CategorizedItem> getCategorizedItems() {
return categorizedItems;
}
/**
* @param categorizedItems the categorizedItems to set
*/
public void setCategorizedItems(Set<CategorizedItem> categorizedItems) {
this.categorizedItems = categorizedItems;
}
}二、Category.java
Java代码
/**
* @author Terrence
*
*/
public class Category
implements Serializable {
/**
*
*/
private static
final long serialVersionUID = 1L;
private Integer id;
private String name;
private Set<CategorizedItem> categorizedItems =
new HashSet<CategorizedItem>();
public Category() {
super();
}
/**
* @return the id
*/
public Integer getId() {
return id;
}
/**
* @param id the id to set
*/
public void setId(Integer id) {
this.id = id;
}
/**
* @return the name
*/
public String getName() {
return name;
}
/**
* @param name the name to set
*/
public void setName(String name) {
this.name = name;
}
/**
* @return the categorizedItems
*/
public Set<CategorizedItem> getCategorizedItems() {
return categorizedItems;
}
/**
* @param categorizedItems the categorizedItems to set
*/
public void setCategorizedItems(Set<CategorizedItem> categorizedItems) {
this.categorizedItems = categorizedItems;
}
}
/**
* @author Terrence
*
*/
public class Category implements Serializable {
/**
*
*/
private static final long serialVersionUID = 1L;
private Integer id;
private String name;
private Set<CategorizedItem> categorizedItems = new HashSet<CategorizedItem>();
public Category() {
super();
}
/**
* @return the id
*/
public Integer getId() {
return id;
}
/**
* @param id the id to set
*/
public void setId(Integer id) {
this.id = id;
}
/**
* @return the name
*/
public String getName() {
return name;
}
/**
* @param name the name to set
*/
public void setName(String name) {
this.name = name;
}
/**
* @return the categorizedItems
*/
public Set<CategorizedItem> getCategorizedItems() {
return categorizedItems;
}
/**
* @param categorizedItems the categorizedItems to set
*/
public void setCategorizedItems(Set<CategorizedItem> categorizedItems) {
this.categorizedItems = categorizedItems;
}
}三、CategorizedItem.java
Java代码
/**
* @author Terrence
*
*/
public class CategorizedItem
implements Serializable {
/**
*
*/
private static
final long serialVersionUID = 1L;
public static
class Id implements Serializable {
/**
*
*/
private static
final long serialVersionUID = 1L;
private Integer thirdId;
private Integer categoryId;
private Integer itemId;
/**
*
*/
public Id() {
super();
}
/**
* @return the thirdId
*/
public Integer getThirdId() {
return thirdId;
}
/**
* @param thirdId the thirdId to set
*/
public void setThirdId(Integer thirdId) {
this.thirdId = thirdId;
}
/**
* @return the categoryId
*/
public Integer getCategoryId() {
return categoryId;
}
/**
* @param categoryId the categoryId to set
*/
public void setCategoryId(Integer categoryId) {
this.categoryId = categoryId;
}
/**
* @return the itemId
*/
public Integer getItemId() {
return itemId;
}
/**
* @param itemId the itemId to set
*/
public void setItemId(Integer itemId) {
this.itemId = itemId;
}
/* (non-Javadoc)
* @see java.lang.Object#hashCode()
*/
@Override
public int hashCode() {
return this.categoryId.hashCode()+this.itemId.hashCode();
}
/* (non-Javadoc)
* @see java.lang.Object#equals(java.lang.Object)
*/
@Override
public boolean equals(Object obj) {
if(obj!=null&&obj
instanceof Id){
Id that = (Id)obj;
return this.categoryId.equals(that.categoryId)&&this.itemId.equals(that.itemId);
}else{
return false;
}
}
}
private Id id = new Id();
private Date dateAdded;
private Item item;
private Category category;
/**
*
*/
public CategorizedItem() {
super();
}
/**
* @return the id
*/
public Id getId() {
return id;
}
/**
* @param id the id to set
*/
public void setId(Id id) {
this.id = id;
}
/**
* @return the dateAdded
*/
public Date getDateAdded() {
return dateAdded;
}
/**
* @param dateAdded the dateAdded to set
*/
public void setDateAdded(Date dateAdded) {
this.dateAdded = dateAdded;
}
/**
* @return the item
*/
public Item getItem() {
return item;
}
/**
* @param item the item to set
*/
public void setItem(Item item) {
this.item = item;
this.id.itemId = item.getId();
item.getCategorizedItems().add(this);
}
/**
* @return the category
*/
public Category getCategory() {
return category;
}
/**
* @param category the category to set
*/
public void setCategory(Category category) {
this.category = category;
this.id.categoryId = category.getId();
category.getCategorizedItems().add(this);
}
/**
* @return the thirdId
*/
public Integer getThirdId() {
return this.id.getThirdId();
}
/**
* @param thirdId the thirdId to set
*/
public void setThirdId(Integer thirdId) {
this.id.thirdId = thirdId;
}
}
/**
* @author Terrence
*
*/
public class CategorizedItem implements Serializable {
/**
*
*/
private static final long serialVersionUID = 1L;
public static class Id implements Serializable {
/**
*
*/
private static final long serialVersionUID = 1L;
private Integer thirdId;
private Integer categoryId;
private Integer itemId;
/**
*
*/
public Id() {
super();
}
/**
* @return the thirdId
*/
public Integer getThirdId() {
return thirdId;
}
/**
* @param thirdId the thirdId to set
*/
public void setThirdId(Integer thirdId) {
this.thirdId = thirdId;
}
/**
* @return the categoryId
*/
public Integer getCategoryId() {
return categoryId;
}
/**
* @param categoryId the categoryId to set
*/
public void setCategoryId(Integer categoryId) {
this.categoryId = categoryId;
}
/**
* @return the itemId
*/
public Integer getItemId() {
return itemId;
}
/**
* @param itemId the itemId to set
*/
public void setItemId(Integer itemId) {
this.itemId = itemId;
}
/* (non-Javadoc)
* @see java.lang.Object#hashCode()
*/
@Override
public int hashCode() {
return this.categoryId.hashCode()+this.itemId.hashCode();
}
/* (non-Javadoc)
* @see java.lang.Object#equals(java.lang.Object)
*/
@Override
public boolean equals(Object obj) {
if(obj!=null&&obj instanceof Id){
Id that = (Id)obj;
return this.categoryId.equals(that.categoryId)&&this.itemId.equals(that.itemId);
}else{
return false;
}
}
}
private Id id = new Id();
private Date dateAdded;
private Item item;
private Category category;
/**
*
*/
public CategorizedItem() {
super();
}
/**
* @return the id
*/
public Id getId() {
return id;
}
/**
* @param id the id to set
*/
public void setId(Id id) {
this.id = id;
}
/**
* @return the dateAdded
*/
public Date getDateAdded() {
return dateAdded;
}
/**
* @param dateAdded the dateAdded to set
*/
public void setDateAdded(Date dateAdded) {
this.dateAdded = dateAdded;
}
/**
* @return the item
*/
public Item getItem() {
return item;
}
/**
* @param item the item to set
*/
public void setItem(Item item) {
this.item = item;
this.id.itemId = item.getId();
item.getCategorizedItems().add(this);
}
/**
* @return the category
*/
public Category getCategory() {
return category;
}
/**
* @param category the category to set
*/
public void setCategory(Category category) {
this.category = category;
this.id.categoryId = category.getId();
category.getCategorizedItems().add(this);
}
/**
* @return the thirdId
*/
public Integer getThirdId() {
return this.id.getThirdId();
}
/**
* @param thirdId the thirdId to set
*/
public void setThirdId(Integer thirdId) {
this.id.thirdId = thirdId;
}
}四、*.hbm.xml,这里节省时间空间写在了一起
Java代码
<hibernate-mapping package="org.terrence.hrsystem.model">
<class name="Item" table="ITEM">
<id name="id" type="integer" column="ITEM_ID">
<generator class="identity" />
</id>
<property name="name" type="string" not-null="true"
update="false" column="ITEM_NAME" />
<set name="categorizedItems" cascade="all, delete-orphan"
inverse="true" lazy="false">
<key column="ITEM_ID" not-null="true" />
<one-to-many class="CategorizedItem" />
</set>
</class>
<class name="Category" table="CATEGORY">
<id name="id" type="integer" column="CATEGORY_ID">
<generator class="identity" />
</id>
<property name="name" type="string" column="CATEGORY_NAME" not-null="true"/>
<set name="categorizedItems" cascade="all, delete-orphan"
inverse="true" lazy="false">
<key column="CATEGORY_ID" not-null="true" />
<one-to-many class="CategorizedItem" />
</set>
</class>
<class name="Category" table="CATEGORY">
<id name="id" type="integer" column="CATEGORY_ID">
<generator class="identity" />
</id>
<class name="CategorizedItem" table="CATEGORIZED_ITEM" mutable="false">
<composite-id name="id" class="CategorizedItem$Id">
<key-property name="thirdId" column="THIRD_ID" type="integer"/>
<key-property name="categoryId" column="CATEGORY_ID"
type="integer" />
<key-property name="itemId" column="ITEM_ID" type="integer" />
</composite-id>
<property name="dateAdded" column="ADDED_ON" type="timestamp"
not-null="true" />
<many-to-one name="item" class="Item" column="ITEM_ID"
not-null="true" insert="false" update="false" />
<many-to-one name="category"
class="Category" column="CATEGORY_ID"
not-null="true" insert="false" update="false" />
</class>
</hibernate-mapping>
<hibernate-mapping package="org.terrence.hrsystem.model"> <class name="Item" table="ITEM"> <id name="id" type="integer" column="ITEM_ID"> <generator class="identity" /> </id> <property name="name" type="string" not-null="true" update="false" column="ITEM_NAME" /> <set name="categorizedItems" cascade="all, delete-orphan" inverse="true" lazy="false"> <key column="ITEM_ID" not-null="true" /> <one-to-many class="CategorizedItem" /> </set> </class> <class name="Category" table="CATEGORY"> <id name="id" type="integer" column="CATEGORY_ID"> <generator class="identity" /> </id> <property name="name" type="string" column="CATEGORY_NAME" not-null="true"/> <set name="categorizedItems" cascade="all, delete-orphan" inverse="true" lazy="false"> <key column="CATEGORY_ID" not-null="true" /> <one-to-many class="CategorizedItem" /> </set> </class> <class name="Category" table="CATEGORY"> <id name="id" type="integer" column="CATEGORY_ID"> <generator class="identity" /> </id> <class name="CategorizedItem" table="CATEGORIZED_ITEM" mutable="false"> <composite-id name="id" class="CategorizedItem$Id"> <key-property name="thirdId" column="THIRD_ID" type="integer"/> <key-property name="categoryId" column="CATEGORY_ID" type="integer" /> <key-property name="itemId" column="ITEM_ID" type="integer" /> </composite-id> <property name="dateAdded" column="ADDED_ON" type="timestamp" not-null="true" /> <many-to-one name="item" class="Item" column="ITEM_ID" not-null="true" insert="false" update="false" /> <many-to-one name="category" class="Category" column="CATEGORY_ID" not-null="true" insert="false" update="false" /> </class> </hibernate-mapping>
五、测试代码
Java代码
/**
* @Title: TestDao.java
* @Package test
* @Description: TODO(用一句话描述该文件做什么)
* @author Terrence.zhung chguxing@163.com
* @date 2011-3-29 上午02:45:05
* @version V1.0
*/
package test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.terrence.hrsystem.dao.CategorizedItemDao;
import org.terrence.hrsystem.dao.CategoryDao;
import org.terrence.hrsystem.dao.ItemDao;
import org.terrence.hrsystem.model.CategorizedItem;
import org.terrence.hrsystem.model.Category;
import org.terrence.hrsystem.model.Item;
/**
* @author Terrence
*
*/
public class TestDao {
/**
* @param args
*/
private static ItemDao itemDao;
private static CategoryDao categoryDao;
private static CategorizedItemDao categorizedItemDao;
private static ApplicationContext ctx;
public static
void init(){
if(ctx==null){
ctx = new ClassPathXmlApplicationContext(new String[]{"classpath:applicationContext.xml","classpath:daoContext.xml"});
}
itemDao = (ItemDao)ctx.getBean("itemDao");
categoryDao = (CategoryDao)ctx.getBean("categoryDao");
categorizedItemDao = (CategorizedItemDao)ctx.getBean("categorizedItemDao");
}
public static
void main(String[] args) throws Exception {
init();
saveItem();
saveCategory();
saveCategoryItem();
}
public static
void saveItem() throws Exception{
Item item = new Item();
item.setName("item2");
itemDao.save(item);
}
public static
void saveCategory() throws Exception{
Category category = new Category();
category.setName("category2");
categoryDao.save(category);
}
public static
void saveCategoryItem() throws Exception{
Item item = itemDao.get(1);
Category category = categoryDao.get(1);
CategorizedItem categorizedItem = new CategorizedItem();
categorizedItem.setItem(item);
categorizedItem.setCategory(category);
categorizedItem.setDateAdded(new java.util.Date());
categorizedItem.setThirdId(5);
categorizedItemDao.save(categorizedItem);
}
}
/**
* @Title: TestDao.java
* @Package test
* @Description: TODO(用一句话描述该文件做什么)
* @author Terrence.zhung chguxing@163.com
* @date 2011-3-29 上午02:45:05
* @version V1.0
*/
package test;
import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.terrence.hrsystem.dao.CategorizedItemDao;
import org.terrence.hrsystem.dao.CategoryDao;
import org.terrence.hrsystem.dao.ItemDao;
import org.terrence.hrsystem.model.CategorizedItem;
import org.terrence.hrsystem.model.Category;
import org.terrence.hrsystem.model.Item;
/**
* @author Terrence
*
*/
public class TestDao {
/**
* @param args
*/
private static ItemDao itemDao;
private static CategoryDao categoryDao;
private static CategorizedItemDao categorizedItemDao;
private static ApplicationContext ctx;
public static void init(){
if(ctx==null){
ctx = new ClassPathXmlApplicationContext(new String[]{"classpath:applicationContext.xml","classpath:daoContext.xml"});
}
itemDao = (ItemDao)ctx.getBean("itemDao");
categoryDao = (CategoryDao)ctx.getBean("categoryDao");
categorizedItemDao = (CategorizedItemDao)ctx.getBean("categorizedItemDao");
}
public static void main(String[] args) throws Exception {
init();
saveItem();
saveCategory();
saveCategoryItem();
}
public static void saveItem() throws Exception{
Item item = new Item();
item.setName("item2");
itemDao.save(item);
}
public static void saveCategory() throws Exception{
Category category = new Category();
category.setName("category2");
categoryDao.save(category);
}
public static void saveCategoryItem() throws Exception{
Item item = itemDao.get(1);
Category category = categoryDao.get(1);
CategorizedItem categorizedItem = new CategorizedItem();
categorizedItem.setItem(item);
categorizedItem.setCategory(category);
categorizedItem.setDateAdded(new java.util.Date());
categorizedItem.setThirdId(5);
categorizedItemDao.save(categorizedItem);
}
}六、说明
因为用了spring，在配置文件配好环境，表可以用hibernate直接生成，不用写SQL语句。
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