Hibernate的入門之配置檔案和增刪改查
阿新 • • 發佈:2018-11-19
首先使用maven匯入jar包,然後配置主xml檔案
<?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. 資料庫相關資訊 --> <property name="connection.username">root</property> <property name="connection.password">root</property> <!--資料庫連結地址--> <property name="connection.url">jdbc:mysql://localhost:3306/hibernate?useUnicode=true&characterEncoding=UTF-8</property> <!--資料庫驅動類--> <property name="connection.driver_class">com.mysql.jdbc.Driver</property> <!--設定資料庫方言--> <property name="dialect">org.hibernate.dialect.MySQLDialect</property> <!-- 配置本地事務(No CurrentSessionContext configured!) --> <property name="hibernate.current_session_context_class">thread</property> <!-- 2. 除錯相關 --> <!--是否顯示資料庫語句在專案部署後要設定為fals提高 專案執行效率--> <property name="show_sql">true</property> <!--格式化sql語句--> <property name="format_sql">true</property> <!-- 3. 新增實體對映檔案 --> <mapping resource="User.hbm.xml"/> </session-factory> </hibernate-configuration>
然後配置實體類的xml檔案,一個實體類對應一個檔案
實體類:
package com.hw.one; import java.io.Serializable; public class User implements Serializable { private static final long serialVersionUID = -3363120264501521428L; private Integer id; private String userName; private String userPwd; private String realName; private String sex; private java.sql.Date birthday; private java.sql.Timestamp createDatetime; private String remark; public User() { super(); } public Integer getId() { return id; } public void setId(Integer id) { this.id = id; } public String getUserName() { return userName; } public void setUserName(String userName) { this.userName = userName; } public String getUserPwd() { return userPwd; } public void setUserPwd(String userPwd) { this.userPwd = userPwd; } public String getRealName() { return realName; } public void setRealName(String realName) { this.realName = realName; } public String getSex() { return sex; } public void setSex(String sex) { this.sex = sex; } public java.sql.Date getBirthday() { return birthday; } public void setBirthday(java.sql.Date birthday) { this.birthday = birthday; } public java.sql.Timestamp getCreateDatetime() { return createDatetime; } public void setCreateDatetime(java.sql.Timestamp createDatetime) { this.createDatetime = createDatetime; } public String getRemark() { return remark; } public void setRemark(String remark) { this.remark = remark; } @Override public String toString() { return "User [id=" + id + ", userName=" + userName + ", userPwd=" + userPwd + ", realName=" + realName + ", sex=" + sex + ", birthday=" + birthday + ", createDatetime=" + createDatetime + ", remark=" + remark + "]"; } }
實體類的配置檔案
<?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> <!--name為全限定名,table為表名 id為主鍵欄位--> <class name="com.hw.one.User" table="t_hibernate_user"> <id name="id" type="java.lang.Integer" column="id"> <generator class="increment" /> </id> <!--name為實體類屬性名,type為屬性型別的全限定名 column為對應資料庫的欄位名--> <property name="userName" type="java.lang.String" column="user_name"> </property> <property name="userPwd" type="java.lang.String" column="user_pwd"> </property> <property name="realName" type="java.lang.String" column="real_name"> </property> <property name="sex" type="java.lang.String" column="sex"> </property> <property name="birthday" type="java.sql.Date" column="birthday"> </property> <property insert="false" update="false" name="createDatetime" type="java.sql.Timestamp" column="create_datetime"> </property> <property name="remark" type="java.lang.String" column="remark"> </property> </class> </hibernate-mapping>
使用測試類連線資料庫對資料增刪改查程式碼
package com.hw.one;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;
import java.sql.Date;
import java.util.List;
/**
* hibernate測試
*/
public class test {
public static void main(String[] args) {
/**
* 1.對hibernate.config.xml建模
* 2.通過建模獲得的config檔案類,獲取所配置的sessionfactory
* 3.獲取session會話
* 4.開啟事務
* 5。操作資料庫
* 6.提交事務
* 7.關閉session會話
*/
Configuration configure = new Configuration().configure("hibernate.cfg.xml");
SessionFactory sessionFactory = configure.buildSessionFactory();
Session session = sessionFactory.openSession();
Transaction transaction = session.beginTransaction();
//新增
// User user = new User();
// user.setBirthday(new Date(new java.util.Date().getTime()));
// user.setRealName("123");
// user.setRemark("123");
// user.setSex("男");
// user.setUserName("123");
// user.setUserPwd("213");
// session.save(user);
//刪除
// User user=new User();
// user.setId(3);
// session.delete(user);
// 查詢
// User user=session.get(User.class,2);
// System.out.println(user.toString());
// List<User> users=session.createQuery("from User").list();
// for (User user : users) {
// System.out.println(user.toString());
// }
// 修改
// User user=session.get(User.class,2);
// user.setUserName("www");
// System.out.println(user.toString());
transaction.commit();
session.close();
}
}