什么是Hibernate
ORM框架/持久层框架jdbc的一个框架
object reference mapping
通过管理对象来改变数据库中的数据
通过管理对象来操作数据库
优势：跨数据库的无缝移植
Hibernate简易增删改查
导入pom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.zking</groupId>
<artifactId>hiberbate</artifactId>
<packaging>war</packaging>
<version>0.0.1-SNAPSHOT</version>
<name>hiberbate 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>hiberbate</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>
创建核心配置文件hibernate.cfg.xml
此处需要导DTD约束（依次寻找）
将这串代码放入hibernate.cfg.xml
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
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/mysql?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/tzx/one/entity/User.hbm.xml" />
<!-- 主键生成策略 -->
</session-factory>
</hibernate-configuration>
创建实体类User
package com.tzx.one.entity;
import java.sql.Date;
import java.sql.Timestamp;
public class User {
private Integer id;
private String userName;
private String userPwd;
private String realName;
private String sex;
private Date birthday;
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 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 Date getBirthday() {
return birthday;
}
public void setBirthday(Date birthday) {
this.birthday = birthday;
}
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 realName, String sex, Date birthday,
Timestamp createDatetime, String remark) {
super();
this.id = id;
this.userName = userName;
this.userPwd = userPwd;
this.realName = realName;
this.sex = sex;
this.birthday = birthday;
this.createDatetime = createDatetime;
this.remark = remark;
}
public User() {
super();
}
@Override
public String toString() {
return "User [id=" + id + ", userName=" + userName + ", userPwd=" + userPwd + ", realName=" + realName
+ ", sex=" + sex + ", birthday=" + birthday + ", createDatetime=" + createDatetime + ", remark="
+ remark + "]";
}
}
写一个实体映射文件User.hbm.xml(注意与实体类同包，并且一个实体类有一个实体映射文件)
此处也需要导入DTD约束
<?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标签中的 name：实体类的全路径名
table:实体类对应的数据库表
id标签:name：实体类中的属性（映射的是表的主键）
type：属性对应的类型
column:属性对应该=的表中的那个列段
property
name：实体类中的属性（映射的是表的非主键）
type：属性对应的类型
column:属性对应该=的表中的那个列段
-->
<class name="com.tzx.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>
实现增删改查
查询
package com.tzx.one.test;
import java.util.List;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
/**
* hiberbate中的查询案例
* @author
*
*/
public class QueryDemo {
public static void main(String[] args) {
// 对hiberbate.cfg.xml进行建模拿到session-factory工厂(两步)
Configuration configure = new Configuration().configure("/hibernate.cfg.xml");
SessionFactory sessionFactory = configure.buildSessionFactory();
// 通过工厂获取到session会话(操作数据库的)
Session session = sessionFactory.openSession();
// 直接操作数据库
List list = session.createQuery("from User").list();
for (Object obj : list) {
System.out.println(obj);
}
// 关闭资源
session.close();
}
}
效果
增加
package com.tzx.one.test;
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.tzx.one.entity.User;
/**
* hibernat 中的增加
* @author
*
*/
public class AddDemo {
public static void main(String[] args) {
//对hibernat.cfg.xml进行建模拿到sessionfactory工厂 (两步) 1.建模 2.拿到工厂
Configuration configure = new Configuration().configure("/hibernate.cfg.xml");
SessionFactory sessionFactory = configure.buildSessionFactory();
//通过工厂获取到session会话（操作数据库的）
Session session = sessionFactory.openSession();
//获取事务对象
Transaction transaction = session.beginTransaction();
//直接操作数据库
session.save(new User("tanzhixian", "123", "大贤哥", "男",new Date(System.currentTimeMillis()), new Timestamp(System.currentTimeMillis()),"暂无"));
//提交事务
transaction.commit();
//关闭资源
session.close();
}
}
修改
package com.tzx.one.test;
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.tzx.one.entity.User;
/**
* hibernat 中的修改
* @author
*
*/
public class EditDemo {
public static void main(String[] args) {
//对hibernat.cfg.xml进行建模拿到sessionfactory工厂 (两步) 1.建模 2.拿到工厂
Configuration configure = new Configuration().configure("/hibernate.cfg.xml");
SessionFactory sessionFactory = configure.buildSessionFactory();
//通过工厂获取到session会话（操作数据库的）
Session session = sessionFactory.openSession();
//获取事务对象
Transaction transaction = session.beginTransaction();
//直接操作数据库
//修改方法有两种：
//第一种
// User user=new User("tanzhixian", "123", "大贤", "男",new Date(System.currentTimeMillis()), new Timestamp(System.currentTimeMillis()),"暂无");
// user.setId(15);
// session.update(user);
//第二种
User user = session.get(User.class, 15);
System.out.println(user);
user.setRealName("大贤2");
//提交事务
transaction.commit();
//关闭资源
session.close();
}
}
删除
package com.tzx.one.test;
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.tzx.one.entity.User;
/**
* hibernat 中的删除
* @author
*
*/
public class DelDemo {
public static void main(String[] args) {
//对hibernat.cfg.xml进行建模拿到sessionfactory工厂 (两步) 1.建模 2.拿到工厂
Configuration configure = new Configuration().configure("/hibernate.cfg.xml");
SessionFactory sessionFactory = configure.buildSessionFactory();
//通过工厂获取到session会话（操作数据库的）
Session session = sessionFactory.openSession();
//获取事务对象
Transaction transaction = session.beginTransaction();
//直接操作数据库
User user=new User();
user.setId(15);
session.delete(user);
//提交事务
transaction.commit();
//关闭资源
session.close();
}
}
如何看jar包有没有冲突，右键
如果出现BUILD SUCCESS代表成功