Hibernate01
Hibernate简介：
在基于MVC设计模式的JAVA WEB应用中，Hibernate可以作为模型层/数据访问层。它通过配置文件(hibernate.properties或hibernate.cfg.xml)和映射文件(***.hbm.xml)把JAVA对象或PO(Persistent Object,持久化对象)映射到数据库中的数据库，然后通过操作PO，对数据表中的数据进行增，删，改，查等操作。
Hibernate的crud
在pom.xml导入Hibernate依赖
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.chenjiahao</groupId>
<artifactId>hibernate</artifactId>
<packaging>war</packaging>
<version>0.0.1-SNAPSHOT</version>
<name>hibernate Maven Webapp</name>
<url>http://maven.apache.org</url>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
<junit.version>4.12</junit.version>
<servlet.version>4.0.0</servlet.version>
<hibernate.version>5.3.0.Final</hibernate.version>
<mysql.driver.version>5.1.46</mysql.driver.version>
</properties>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>${junit.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>${servlet.version}</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-core</artifactId>
<version>${hibernate.version}</version>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>${mysql.driver.version}</version>
</dependency>
</dependencies>
<build>
<finalName>hibernate</finalName>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.7.0</version>
<configuration>
<source>${maven.compiler.source}</source>
<target>${maven.compiler.target}</target>
<encoding>${project.build.sourceEncoding}</encoding>
</configuration>
</plugin>
</plugins>
</build>
</project>
在src/main/resources目录下创建：（主配置文件hibernate.cfg.xml）
<?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. 数据库相关 --> <property name="connection.username">root</property> <property name="connection.password">123</property> <property name="connection.url">jdbc:mysql://localhost:3306/T224?useUnicode=true&characterEncoding=UTF-8 </property> <property name="connection.driver_class">com.mysql.jdbc.Driver</property> <property name="dialect">org.hibernate.dialect.MySQLDialect</property> <!-- 配置本地事务（No CurrentSessionContext configured!） --> <property name="hibernate.current_session_context_class">thread</property> <!-- 2. 调试相关 --> <property name="show_sql">true</property> <property name="format_sql">true</property> <!-- 3. 添加实体映射文件 --> <mapping resource="com/chenjiahao/one/entity/User.hbm.xml"/> </session-factory> </hibernate-configuration>
子配置文件(和实体类在同一目录下)：（user.hbm.xml）
<?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>
<!--
class标签：
name:对应的是需要映射的实体类的全路径名
table:实体类对应的数据库中的表
id标签： 配置的是表中的主键
name:对应的是实体类的属性名
type:指的是实体类数据类型
column:数据库表对应的列段
property:配置出去主键以外列段对应的类属性映射关系
name:对应的是实体类的属性名
type:指的是实体类数据类型
column:数据库表对应的列段
insert="false" update="false"
上面的表示的含义是：该列段或者说该属性只作查询用，不做更新
-->
<class name="com.chenjiahao.one.entity.User" table="t_hibernate_user">
<id name="id" type="java.lang.Integer" column="id">
<generator class="increment" />
</id>
<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>
User实体类：
package com.chenjiahao.one.entity;
import java.sql.Date;
import java.sql.Timestamp;
public class User {
private Integer id;
private String userName;
private String userPwd;
private String sex;
private Date birthday;
private String realName;
private Timestamp createDatetime;
private String remark;
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 getSex() {
return sex;
}
public void setSex(String sex) {
this.sex = sex;
}
public Date getBirthday() {
return birthday;
}
public void setBirthday(Date birthday) {
this.birthday = birthday;
}
public String getRealName() {
return realName;
}
public void setRealName(String realName) {
this.realName = realName;
}
public Timestamp getCreateDatetime() {
return createDatetime;
}
public void setCreateDatetime(Timestamp createDatetime) {
this.createDatetime = createDatetime;
}
public String getRemark() {
return remark;
}
public void setRemark(String remark) {
this.remark = remark;
}
public User(Integer id, String userName, String userPwd, String sex, Date birthday, String realName,
Timestamp createDatetime, String remark) {
super();
this.id = id;
this.userName = userName;
this.userPwd = userPwd;
this.sex = sex;
this.birthday = birthday;
this.realName = realName;
this.createDatetime = createDatetime;
this.remark = remark;
}
public User() {
super();
// TODO Auto-generated constructor stub
}
@Override
public String toString() {
return "User [id=" + id + ", userName=" + userName + ", userPwd=" + userPwd + ", sex=" + sex + ", birthday="
+ birthday + ", realName=" + realName + ", createDatetime=" + createDatetime + ", remark=" + remark
+ "]";
}
}
测试：
insetDemo类：
package com.chenjiahao.one.demo;
import java.sql.Date;
import java.sql.Timestamp;
import java.util.List;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;
import com.chenjiahao.one.entity.User;
/**
* hibernate新增演示
* @author dell
*
*/
public class InsertDemo {
public static void main(String[] args) {
Configuration configure = new Configuration().configure("/hibernate.cfg.xml");
SessionFactory sessionFactory = configure.buildSessionFactory();
//会话，而这里的会话指的是操作数据库的链接
Session session = sessionFactory.openSession();
Transaction transaction = session.beginTransaction();
session.save(new User(null, "123", "456", "男", new Date(System.currentTimeMillis()), "1234", new Timestamp(System.currentTimeMillis()), "777"));
transaction.commit();
session.close();
}
}
DeleteUser类：
package com.chenjiahao.one.demo;
import java.util.List;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;
import com.chenjiahao.one.entity.User;
/**
* hibernate删除演示
* @author dell
*
*/
public class DeleteDemo {
public static void main(String[] args) {
Configuration configure = new Configuration().configure("/hibernate.cfg.xml");
SessionFactory sessionFactory = configure.buildSessionFactory();
//会话，而这里的会话指的是操作数据库的链接
Session session = sessionFactory.openSession();
Transaction transaction = session.beginTransaction();
User user = new User();
user.setId(1);
session.delete(user);
transaction.commit();
session.close();
}
}
UpdateUser类：
package com.chenjiahao.one.demo;
import java.sql.Date;
import java.sql.Timestamp;
import java.util.List;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;
import com.chenjiahao.one.entity.User;
/**
* hibernate修改演示
* @author dell
*
*/
public class UpdateDemo {
public static void main(String[] args) {
Configuration configure = new Configuration().configure("/hibernate.cfg.xml");
SessionFactory sessionFactory = configure.buildSessionFactory();
//会话，而这里的会话指的是操作数据库的链接
Session session = sessionFactory.openSession();
Transaction transaction = session.beginTransaction();
// session.save(new User(null, "123", "456", "男", new Date(System.currentTimeMillis()), "1234", new Timestamp(System.currentTimeMillis()), "777"));
User user = session.get(User.class, 1);
user.setRealName("000");
System.out.println(user);
transaction.commit();
session.close();
}
}
InsertUser类：
package com.chenjiahao.one.demo;
import java.util.List;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
/**
* hibernate查询演示
* @author dell
*
*/
public class QueryDemo {
public static void main(String[] args) {
Configuration configure = new Configuration().configure("/hibernate.cfg.xml");
SessionFactory sessionFactory = configure.buildSessionFactory();
//会话，而这里的会话指的是操作数据库的链接
Session session = sessionFactory.openSession();
List list = session.createQuery("from User").list();
for (Object object : list) {
System.out.println(object);
}
session.close();
}
}
Hibernate的三种状态：
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