Hibernate進階學習3
阿新 • • 發佈：2018-11-19
Hibernate進階學習3
測試hibernate的多表關聯操作（一對多，多對一，多對多）
表之間的關係主要在類與元資料配置檔案中體現
package com.hibernate.domain; import java.util.HashSet; import java.util.Set; public class Customer { private Long cust_id; private String cust_name; private String cust_source;Customerprivate String cust_industry; private String cust_level; private String cust_linkman; private String cust_phone; private String cust_mobile; /** 使用set集合,表達一對多關係 */ private Set<LinkMan> linkMens = new HashSet<LinkMan>(); public Set<LinkMan> getLinkMens() {return linkMens; } public void setLinkMens(Set<LinkMan> linkMens) { this.linkMens = linkMens; } public Long getCust_id() { return cust_id; } public void setCust_id(Long cust_id) { this.cust_id = cust_id; } public String getCust_name() {return cust_name; } public void setCust_name(String cust_name) { this.cust_name = cust_name; } public String getCust_source() { return cust_source; } public void setCust_source(String cust_source) { this.cust_source = cust_source; } public String getCust_industry() { return cust_industry; } public void setCust_industry(String cust_industry) { this.cust_industry = cust_industry; } public String getCust_level() { return cust_level; } public void setCust_level(String cust_level) { this.cust_level = cust_level; } public String getCust_linkman() { return cust_linkman; } public void setCust_linkman(String cust_linkman) { this.cust_linkman = cust_linkman; } public String getCust_phone() { return cust_phone; } public void setCust_phone(String cust_phone) { this.cust_phone = cust_phone; } public String getCust_mobile() { return cust_mobile; } public void setCust_mobile(String cust_mobile) { this.cust_mobile = cust_mobile; } @Override public String toString() { return "Customer [cust_id=" + cust_id + ", " + "cust_name=" + cust_name + "]"; } }
<?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"> <!-- 配置表與實體物件的關係 --> <hibernate-mapping package="com.hibernate.domain"> <!-- class元素: 配置實體與表的對應關係的 --> <class name="Customer" table="cst_customer"> <!-- id元素:配置主鍵對映的屬性 --> <id name="cust_id"> <!-- generator:主鍵生成策略，每條資料錄入時，主鍵的生成規則 --> <generator class="native"></generator> </id> <!-- property元素:除id之外的普通屬性對映 --> <property name="cust_name" column="cust_name"></property> <property name="cust_source" column="cust_source"></property> <property name="cust_industry" column="cust_industry"></property> <property name="cust_level" column="cust_level"></property> <property name="cust_linkman" column="cust_linkman"></property> <property name="cust_phone" column="cust_phone"></property> <property name="cust_mobile" column="cust_mobile"></property> <!-- 集合,一對多關係,在配置檔案中配置 --> <!-- name屬性:集合屬性名 column屬性: 外來鍵列名 class屬性: 與我關聯的物件完整類名 --> <!-- 級聯操作: cascade save-update: 級聯儲存更新 delete:級聯刪除 all:save-update+delete 級聯操作: 簡化操作.目的就是為了少些兩行程式碼. --> <!-- inverse屬性: 配置關係是否維護. true: customer不維護關係 false(預設值): customer維護關係 inverse屬性: 效能優化.提高關係維護的效能. 原則: 無論怎麼放棄,總有一方必須要維護關係. 一對多關係中: 一的一方放棄.也只能一的一方放棄.多的一方不能放棄. --> <set name="linkMens" inverse="true" cascade="delete" > <key column="lkm_cust_id" ></key> <one-to-many class="LinkMan" /> </set> </class> </hibernate-mapping>Customer.hbm.xml
package com.hibernate.domain; public class LinkMan { private Long lkm_id; private Character lkm_gender; private String lkm_name; private String lkm_phone; private String lkm_email; private String lkm_qq; private String lkm_mobile; private String lkm_memo; private String lkm_position; /** * 表達多對一關係 */ private Customer customer ; public Customer getCustomer() { return customer; } public void setCustomer(Customer customer) { this.customer = customer; } public Long getLkm_id() { return lkm_id; } public void setLkm_id(Long lkm_id) { this.lkm_id = lkm_id; } public Character getLkm_gender() { return lkm_gender; } public void setLkm_gender(Character lkm_gender) { this.lkm_gender = lkm_gender; } public String getLkm_name() { return lkm_name; } public void setLkm_name(String lkm_name) { this.lkm_name = lkm_name; } public String getLkm_phone() { return lkm_phone; } public void setLkm_phone(String lkm_phone) { this.lkm_phone = lkm_phone; } public String getLkm_email() { return lkm_email; } public void setLkm_email(String lkm_email) { this.lkm_email = lkm_email; } public String getLkm_qq() { return lkm_qq; } public void setLkm_qq(String lkm_qq) { this.lkm_qq = lkm_qq; } public String getLkm_mobile() { return lkm_mobile; } public void setLkm_mobile(String lkm_mobile) { this.lkm_mobile = lkm_mobile; } public String getLkm_memo() { return lkm_memo; } public void setLkm_memo(String lkm_memo) { this.lkm_memo = lkm_memo; } public String getLkm_position() { return lkm_position; } public void setLkm_position(String lkm_position) { this.lkm_position = lkm_position; } }LinkMan
<?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 package="com.hibernate.domain" > <class name="LinkMan" table="cst_linkman" > <id name="lkm_id" > <generator class="native"></generator> </id> <property name="lkm_gender" ></property> <property name="lkm_name" ></property> <property name="lkm_phone" ></property> <property name="lkm_email" ></property> <property name="lkm_qq" ></property> <property name="lkm_mobile" ></property> <property name="lkm_memo" ></property> <property name="lkm_position" ></property> <!-- 多對一 --> <!-- name屬性:引用屬性名 column屬性: 外來鍵列名 class屬性: 與我關聯的物件完整類名 --> <!-- 級聯操作: cascade save-update: 級聯儲存更新 delete:級聯刪除 all:save-update+delete 級聯操作: 簡化操作.目的就是為了少些兩行程式碼. --> <!-- 多的一方: 不能放棄維護關係的.外來鍵欄位就在多的一方. --> <many-to-one name="customer" column="lkm_cust_id" class="Customer" > </many-to-one> </class> </hibernate-mapping>LinkMan.hbm.xml
package com.hibernate.domain; import java.util.HashSet; import java.util.Set; public class Role { private Long role_id; private String role_name; private String role_memo; /** * 表達多對多 */ private Set<User> users = new HashSet<User>(); public Long getRole_id() { return role_id; } public void setRole_id(Long role_id) { this.role_id = role_id; } public String getRole_name() { return role_name; } public void setRole_name(String role_name) { this.role_name = role_name; } public String getRole_memo() { return role_memo; } public void setRole_memo(String role_memo) { this.role_memo = role_memo; } public Set<User> getUsers() { return users; } public void setUsers(Set<User> users) { this.users = users; } }Role
<?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 package="com.hibernate.domain" > <class name="Role" table="sys_role" > <id name="role_id" > <generator class="native"></generator> </id> <property name="role_name" ></property> <property name="role_memo" ></property> <!-- 使用inverse屬性 true: 放棄維護外來鍵關係 false(預設值):維護關係 結論: 將來在開發中,如果遇到多對多關係.一定要選擇一方放棄維護關係. 一般誰來放棄要看業務方向. 例如錄入員工時,需要為員工指定所屬角色. 那麼業務方向就是由員工維護角色. 角色不需要維護與員工關係.角色放棄維護 --> <set name="users" table="sys_user_role" inverse="true" > <key column="role_id" ></key> <many-to-many class="User" column="user_id" ></many-to-many> </set> </class> </hibernate-mapping>Role.hbm.xml
package com.hibernate.domain; import java.util.HashSet; import java.util.Set; public class User { private Long user_id; private String user_code; private String user_name; private String user_password; private Character user_state; /** 表達多對多 */ private Set<Role> roles = new HashSet<Role>(); public Long getUser_id() { return user_id; } public void setUser_id(Long user_id) { this.user_id = user_id; } public String getUser_code() { return user_code; } public void setUser_code(String user_code) { this.user_code = user_code; } public String getUser_name() { return user_name; } public void setUser_name(String user_name) { this.user_name = user_name; } public String getUser_password() { return user_password; } public void setUser_password(String user_password) { this.user_password = user_password; } public Character getUser_state() { return user_state; } public void setUser_state(Character user_state) { this.user_state = user_state; } public Set<Role> getRoles() { return roles; } public void setRoles(Set<Role> roles) { this.roles = roles; } }User
<?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 package="com.hibernate.domain" > <class name="User" table="sys_user" > <id name="user_id" > <generator class="native"></generator> </id> <property name="user_code" ></property> <property name="user_name" ></property> <property name="user_password" ></property> <property name="user_state" ></property> <!-- 多對多關係表達 --> <!-- name: 集合屬性名 table: 配置中間表名 key |-column:外來鍵,別人引用"我"的外來鍵列名 class: 我與哪個類是多對多關係 column:外來鍵.我引用比人的外來鍵列名 --> <!-- cascade級聯操作: save-update: 級聯儲存更新 delete:級聯刪除 all:級聯儲存更新+級聯刪除 結論: cascade簡化程式碼書寫.該屬性使不使用無所謂. 建議要用只用save-update. 如果使用delete操作太過危險.尤其在多對多中.不建議使用. --> <set name="roles" table="sys_user_role" cascade="save-update" > <key column="user_id" ></key> <many-to-many class="Role" column="role_id" ></many-to-many> </set> </class> </hibernate-mapping>User.hbm.xml
測試一對多，多對一
package com.hibernate.onetomany; import com.hibernate.domain.Customer; import com.hibernate.domain.LinkMan; import com.hibernate.utils.HibernateUtils; import org.hibernate.Criteria; import org.hibernate.Session; import org.hibernate.Transaction; import org.junit.Test; import java.util.List; /** * @author: 肖德子裕 * @date: 2018/11/18 19:38 * @description: 測試一對多操作 */ public class Demo01 { /** 新增客戶和聯絡人資訊 */ @Test public void test1(){ //獲取session Session session = HibernateUtils.openSession(); //開啟事務 Transaction transaction = session.beginTransaction(); /********************* 資料庫操作 **********************/ Customer customer=new Customer(); customer.setCust_name("xdzy"); LinkMan linkMan=new LinkMan(); linkMan.setLkm_name("王五"); LinkMan linkMan2=new LinkMan(); linkMan2.setLkm_name("王五"); customer.getLinkMens().add(linkMan); customer.getLinkMens().add(linkMan2); linkMan.setCustomer(customer); linkMan2.setCustomer(customer); session.save(customer); session.save(linkMan); session.save(linkMan2); /*******************************************************/ //提交事務 transaction.commit(); //關閉資源 session.close(); } /** 為客戶新增聯絡人 */ @Test public void test2(){ //獲取session Session session = HibernateUtils.openSession(); //開啟事務 Transaction transaction = session.beginTransaction(); /********************* 資料庫操作 **********************/ Customer customer = session.get(Customer.class, 1L); LinkMan linkMan=new LinkMan(); linkMan.setLkm_name("劉三"); customer.getLinkMens().add(linkMan); linkMan.setCustomer(customer); session.save(linkMan); /*******************************************************/ //提交事務 transaction.commit(); //關閉資源 session.close(); } /** 為客戶移除聯絡人 */ @Test public void test3(){ //獲取session Session session = HibernateUtils.openSession(); //開啟事務 Transaction transaction = session.beginTransaction(); /********************* 資料庫操作 **********************/ Customer customer = session.get(Customer.class, 1L); LinkMan linkMan=session.get(LinkMan.class,3L); customer.getLinkMens().remove(linkMan); linkMan.setCustomer(null); /*******************************************************/ //提交事務 transaction.commit(); //關閉資源 session.close(); } }demo1
package com.hibernate.onetomany; import com.hibernate.domain.Customer; import com.hibernate.domain.LinkMan; import com.hibernate.utils.HibernateUtils; import org.hibernate.Session; import org.hibernate.Transaction; import org.junit.Test; /** * @author: 肖德子裕 * @date: 2018/11/19 8:05 * @description: 測試級聯操作 */ public class Demo02 { /** 刪除使用者時級聯刪除聯絡人;cascade:delete */ @Test public void test1(){ //獲取session Session session = HibernateUtils.openSession(); //開啟事務 Transaction transaction = session.beginTransaction(); /********************* 資料庫操作 **********************/ Customer customer = session.get(Customer.class, 1L); session.delete(customer); /*******************************************************/ //提交事務 transaction.commit(); //關閉資源 session.close(); } }demo2
測試多得多
package com.hibernate.manytomany; import com.hibernate.domain.Customer; import com.hibernate.domain.LinkMan; import com.hibernate.domain.Role; import com.hibernate.domain.User; import com.hibernate.utils.HibernateUtils; import org.hibernate.Session; import org.hibernate.Transaction; import org.junit.Test; /** * @author: 肖德子裕 * @date: 2018/11/19 10:15 * @description: 測試多得多操作 */ public class Demo01 { /** 新增員工以及員工的職位 */ @Test public void test1(){ //獲取session Session session = HibernateUtils.openSession(); //開啟事務 Transaction transaction = session.beginTransaction(); /********************* 資料庫操作 **********************/ User user=new User(); user.setUser_name("xdzy"); User user1=new User(); user1.setUser_name("王五"); Role role=new Role(); role.setRole_name("學生"); Role role1=new Role(); role1.setRole_name("老師"); user.getRoles().add(role); user.getRoles().add(role1); user1.getRoles().add(role); user1.getRoles().add(role1); role.getUsers().add(user); role.getUsers().add(user1); role1.getUsers().add(user); role1.getUsers().add(user1); session.save(user); session.save(user1); session.save(role); session.save(role1); /*******************************************************/ //提交事務 transaction.commit(); //關閉資源 session.close(); } /** 為員工新增一個職位 */ @Test public void test2(){ //獲取session Session session = HibernateUtils.openSession(); //開啟事務 Transaction transaction = session.beginTransaction(); /********************* 資料庫操作 **********************/ User user = session.get(User.class, 1L); Role role=new Role(); role.setRole_name("班主任"); user.getRoles().add(role); session.save(user); /*******************************************************/ //提交事務 transaction.commit(); //關閉資源 session.close(); } }demo1