標籤:hibernate5-分頁查詢與模糊查詢
1.建立項目,項目名稱hibernatedemo7,目錄結構
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2.在項目中建立lib目錄存放jar檔案,目錄結構
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3.在src目錄中建立實體Bean Forum,包名(com.mycompany.demo.bean),
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4.實體Bean Forum的內容如下
package com.mycompany.demo.bean;public class Forum {private int fid;private String name;public Forum() {super();}public Forum(String name) {super();this.name = name;}public int getFid() {return fid;}public void setFid(int fid) {this.fid = fid;}public String getName() {return name;}public void setName(String name) {this.name = name;}@Overridepublic int hashCode() {final int prime = 31;int result = 1;result = prime * result + fid;result = prime * result + ((name == null) ? 0 : name.hashCode());return result;}@Overridepublic boolean equals(Object obj) {if (this == obj)return true;if (obj == null)return false;if (getClass() != obj.getClass())return false;Forum other = (Forum) obj;if (fid != other.fid)return false;if (name == null) {if (other.name != null)return false;} else if (!name.equals(other.name))return false;return true;}}
5.在src目錄中建立實體Bean Forum的對應檔Forum.hbm.xml,包名(com.mycompany.demo.bean),
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6.對應檔Forum.hbm.xml的內容如下
<?xml version="1.0" encoding="utf-8"?><!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD//EN" "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd"> <!--package:指定<class/>所在的包 --><hibernate-mapping package="com.mycompany.demo.bean"><!--name:類名table:表名 catalog:資料庫名稱,預設為hibernate.cfg.xml中配置的資料庫名稱 --> <class name="Forum" table="hnsq_forum" catalog="b_shequ_two"> <meta attribute="class-description"> This class contains the forum detail. </meta> <!-- name:屬性名稱 colum:列名 --> <id name="fid" type="int" column="fid"> <!-- increment:hibernate維護主索引值 identity:資料庫自增長 sequence:序列 native:根據不同的資料庫選擇建置原則 uuid:通過UUID演算法產生,實際使用較多 assigned:手工設定 --> <generator class="native"/> </id> <!-- length:位元組長度 type:欄位類型,支援java和hibernate類型 not-null:非空約束 unique:唯一性限制式 --> <property name="name" column="name" type="string" length="50" not-null="true" unique="false"/> </class></hibernate-mapping>
7.在src目錄中建立工具類 HbnUtil,包名(com.mycompany.demo.util),
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8.工具類 HbnUtil的內容如下
package com.mycompany.demo.util;import org.hibernate.Session;import org.hibernate.SessionFactory;import org.hibernate.cfg.Configuration;public class HbnUtil {private static SessionFactory sessionFactory;public static Session getSession(){if(sessionFactory == null || sessionFactory.isClosed()){sessionFactory = new Configuration().configure().buildSessionFactory();}return sessionFactory.getCurrentSession();}}
9.在src目錄中建立Hibernate的設定檔hibernate.cfg.xml,
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10.Hibernate的設定檔hibernate.cfg.xml的內容如下
<?xml version="1.0" encoding="utf-8"?><!DOCTYPE hibernate-configuration SYSTEM "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd"><hibernate-configuration> <session-factory> <!-- 方言,可以從Hibernate核心jar(hibernate-core-x.x.x.Finall.jar) 檔案中的or.hibernate.dialect包中找到相應的類,類的全名就是 --> <property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property> <!-- 驅動 --> <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property> <!-- 資料庫連接地址 --> <property name="hibernate.connection.url">jdbc:mysql://localhost:3306/b_shequ_two</property> <!-- 使用者名稱 --> <property name="hibernate.connection.username"> root </property> <!-- 密碼 --> <property name="hibernate.connection.password"></property> <!-- create:每次都新建立,如果存在就刪除 create-drop:建立新表,sessionFactory關閉,表會刪除 update :表欄位增加,會同步,欄位減少不同步,資料改變會同步修改 --> <property name="hibernate.hbm2ddl.auto">update</property> <!-- 輸出sql --> <property name="hibernate.show_sql">true</property> <!-- 格式化sql --> <property name="hibernate.format_sql">true</property> <!-- 事務環境一個線程對一個事務 thread:本地事務環境 jta:分散式交易環境 SpringSessionContext:用於ssh整合 --> <property name="hibernate.current_session_context_class">thread</property> <!-- 使用c3p0資料來源 --> <property name="hibernate.connection.provider_class"> org.hibernate.c3p0.internal.C3P0ConnectionProvider </property> <!-- List of XML mapping files --> <mapping resource="com/mycompany/demo/bean/Forum.hbm.xml"/></session-factory></hibernate-configuration>
11.在項目中建立test目錄存放測試檔案,檔案名稱ManageForum,包名(com.mycompany.demo.bean),目錄結構
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12.ManageForum測試類別的內容如下
package com.mycompany.demo.bean;import java.util.List;import org.hibernate.HibernateException;import org.hibernate.Query;import org.hibernate.SQLQuery;import org.hibernate.Session;import org.hibernate.Transaction;import org.hibernate.criterion.Order;import org.hibernate.criterion.Restrictions;import org.junit.Before;import org.junit.Test;import com.mycompany.demo.util.HbnUtil;public class ManageForum {private Session session;@Beforepublic void init(){session = HbnUtil.getSession();}/* * 分頁查詢-SQL */@Testpublic void testLimitForSQL(){try {session.beginTransaction();String sql = "SELECT * FROM hnsq_forum LIMIT ?,?";List<Forum> forums = session.createSQLQuery(sql).addEntity(Forum.class).setParameter(0, 2).setParameter(1, 10).list();for (Forum forum : forums) {System.out.println(forum.getName());}session.getTransaction().commit();} catch (Exception e) {session.getTransaction().rollback();e.printStackTrace();}}/* * 分頁查詢-HQL */@Testpublic void testLimitForHQL(){try {session.beginTransaction();String sql = "FROM Forum";List<Forum> forums = session.createQuery(sql).setFirstResult(2).setMaxResults(10).list();for (Forum forum : forums) {System.out.println(forum.getName());}session.getTransaction().commit();} catch (Exception e) {session.getTransaction().rollback();e.printStackTrace();}}/* * 分頁查詢-QBC */@Testpublic void testLimitForQBC(){try {session.beginTransaction();String sql = "FROM Forum";List<Forum> forums = session.createCriteria(Forum.class).setFirstResult(2).setMaxResults(10).list();for (Forum forum : forums) {System.out.println(forum.getName());}session.getTransaction().commit();} catch (Exception e) {session.getTransaction().rollback();e.printStackTrace();}}/* * 模糊查詢-SQL */@Testpublic void testLikeForSQL(){try {session.beginTransaction();String sql = "SELECT * FROM hnsq_forum WHERE name LIKE :name ";List<Forum> forums = session.createSQLQuery(sql).addEntity(Forum.class).setParameter("name", "%demo%").list();for (Forum forum : forums) {System.out.println(forum.getName());}session.getTransaction().commit();} catch (Exception e) {e.printStackTrace();session.getTransaction().rollback();}}/* * 模糊查詢-HQL */@Testpublic void testLikeForHQL(){try {session.beginTransaction();String sql = "FROM Forum WHERE name LIKE :name ";List<Forum> forums = session.createQuery(sql).setParameter("name", "%demo%").list();for (Forum forum : forums) {System.out.println(forum.getName());}session.getTransaction().commit();} catch (Exception e) {e.printStackTrace();session.getTransaction().rollback();}}/* * 模糊查詢-QBC */@Testpublic void testLikeForQBC(){try {session.beginTransaction();List<Forum> forums = session.createCriteria(Forum.class).add(Restrictions.like("name", "%demo%")).list();for (Forum forum : forums) {System.out.println(forum.getName());}session.getTransaction().commit();} catch (Exception e) {e.printStackTrace();session.getTransaction().rollback();}}}
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Hibernate5-分頁查詢與模糊查詢