hibernate入门
导入以下代码到pom.xml(jar包)
<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.temp</groupId> <artifactId>bn</artifactId> <packaging>war</packaging> <version>0.0.1-SNAPSHOT</version> <name>bn 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>bn</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目录下面创建一个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/jt?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/jt/entity/User.hbm.xml"/> </session-factory> </hibernate-configuration>
建立一个实体类
package com.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; } @Override public String toString() { return "User [id=" + id + ", userName=" + userName + ", userPwd=" + userPwd + ", realName=" + realName + ", sex=" + sex + ", birthday=" + birthday + ", createDatetime=" + createDatetime + ", remark=" + remark + "]"; } public User(String userName, String userPwd, String realName, String sex, Date birthday, Timestamp createDatetime, String remark) { super(); this.userName = userName; this.userPwd = userPwd; this.realName = realName; this.sex = sex; this.birthday = birthday; this.createDatetime = createDatetime; this.remark = remark; } public User() { super(); // TODO Auto-generated constructor stub } }
在创建一个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 name="com.jt.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>
将这个xml在之前创建的xml中添加映射关系
然后下面就是增删改查的代码了
查询
package com.test;
import java.util.List;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
/**
* hibernate 中查询案例
* @author jt
*
*/
public class QueryDemo {
public static void main(String[] args) {
//对hibernate.cfg.xml进行建模拿到sessionfactory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);
}
//关闭数据库
session.close();
}
}
新增
package com.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.jt.entity.User;
/**
* hibernate 中增加案例
* @author jt
*
*/
public class AddDemo {
public static void main(String[] args) {
//对hibernate.cfg.xml进行建模拿到sessionfactory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();
//获取事务对象
Transaction Transaction = session.beginTransaction();
//直接操作数据库
session.save(new User("jt", "123456","王五", "男", new Date(System.currentTimeMillis()),new Timestamp(System.currentTimeMillis()), "暂无介绍"));
//提交事务
Transaction.commit();
//关闭数据库
session.close();
}
}
修改
package com.test;
import java.io.Serializable;
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.jt.entity.User;
/**
* hibernate 中修改案例
* @author jt
*
*/
public class EditDemo {
public static void main(String[] args) {
//对hibernate.cfg.xml进行建模拿到sessionfactory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();
//获取事务对象
Transaction Transaction = session.beginTransaction();
//直接操作数据库
User user = new User("jt2", "123456","王五2", "男", new Date(System.currentTimeMillis()),new Timestamp(System.currentTimeMillis()), "暂无介绍2");
user.setId(15);
session.update(user);
// User user = session.get(User.class,15);
// System.out.println(user);
// user.setRealName("jt3");
//提交事务
Transaction.commit();
//关闭数据库
session.close();
}
}
删除
package com.test;
import java.io.Serializable;
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.jt.entity.User;
/**
* hibernate 中删除案例
* @author jt
*
*/
public class DelDemo {
public static void main(String[] args) {
//对hibernate.cfg.xml进行建模拿到sessionfactory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();
//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();
//关闭数据库
session.close();
}
}