Hibernate入门（2）- 不用配置用注解

在上一个例子里面，我用的配置文件的方式，这次改成注解。

pom.xml

增加了hibernate-commons-annotations和hibernate-annotations

<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/xsd/maven-4.0.0.xsd">

	<modelVersion>4.0.0</modelVersion>

	<groupId>com.wisdombud</groupId>

	<artifactId>HibernateTest</artifactId>

	<version>0.0.1-SNAPSHOT</version>

	<packaging>jar</packaging>

	<name>HibernateTest</name>

	<url>http://maven.apache.org</url>

	<properties>

		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

		<hibernate.version>4.2.0.Final</hibernate.version>

		<hibernate.search>4.2.0.Final</hibernate.search>

		<mysql-connector-java.version>5.1.29</mysql-connector-java.version>

	</properties>

	<dependencies>

		<dependency>

			<groupId>junit</groupId>

			<artifactId>junit</artifactId>

			<version>3.8.1</version>

			<scope>test</scope>

		</dependency>

		<dependency>

			<groupId>mysql</groupId>

			<artifactId>mysql-connector-java</artifactId>

			<version>${mysql-connector-java.version}</version>

		</dependency>

		<dependency>

			<groupId>org.hibernate</groupId>

			<artifactId>hibernate-core</artifactId>

			<version>${hibernate.version}</version>

		</dependency>

		<dependency>

			<groupId>org.hibernate</groupId>

			<artifactId>hibernate-c3p0</artifactId>

			<version>${hibernate.version}</version>

		</dependency>

		<dependency>

			<groupId>org.hibernate</groupId>

			<artifactId>hibernate-ehcache</artifactId>

			<version>${hibernate.version}</version>

		</dependency>

		<dependency>

			<groupId>org.hibernate</groupId>

			<artifactId>hibernate-search</artifactId>

			<version>${hibernate.search}</version>

		</dependency>

		<dependency>

			<groupId>org.hibernate</groupId>

			<artifactId>hibernate-entitymanager</artifactId>

			<version>${hibernate.version}</version>

		</dependency>

		<dependency>

			<groupId>org.hibernate</groupId>

			<artifactId>hibernate-validator</artifactId>

			<version>${hibernate.version}</version>

		</dependency>

				<dependency>

			<groupId>org.hibernate</groupId>

			<artifactId>hibernate-commons-annotations</artifactId>

			<version>3.2.0.Final</version>

		</dependency>

		<dependency>

			<groupId>org.hibernate</groupId>

			<artifactId>hibernate-annotations</artifactId>

			<version>3.2.0.ga</version>

		</dependency>

	</dependencies>

</project>

hibernate.cfg.xml配置文件

把 mapping resource 改成 mapping class

<?xml version='1.0' encoding='UTF-8'?>

<!DOCTYPE hibernate-configuration PUBLIC

          "-//Hibernate/Hibernate Configuration DTD 3.0//EN"

          "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">

<hibernate-configuration>

	<session-factory>

		<property name="dialect">org.hibernate.dialect.MySQLDialect</property>

		<property name="connection.url">

			jdbc:mysql://localhost:3306/tz?useUnicode=true&amp;characterEncoding=utf8

		</property>

		<property name="connection.username">tz</property>

		<property name="connection.password">tz</property>

		<property name="connection.driver_class">com.mysql.jdbc.Driver</property>

		<property name="show_sql">true</property>

		<mapping class="com.wisdombud.HibernateTest.Dept" />

	</session-factory>

</hibernate-configuration>

对象的修改

这个是重点，需要在类和属性上面增加注解。可以在属性上增加注解或者在get方法上增加注解。

package com.wisdombud.HibernateTest;

import javax.persistence.Column;

import javax.persistence.Entity;

import javax.persistence.Id;

import javax.persistence.Table;

@Entity

@Table(name = "dept")

public class Dept {

	private String id;

	private String DeptNo;

	private String DName;

	@Column(name = "id")

	@Id

	public String getId() {

		return id;

	}

	public void setId(String id) {

		this.id = id;

	}

	@Column(name = "DeptNo")

	public String getDeptNo() {

		return DeptNo;

	}

	public void setDeptNo(String deptNo) {

		DeptNo = deptNo;

	}

	@Column(name = "DName")

	public String getDName() {

		return DName;

	}

	public void setDName(String dName) {

		DName = dName;

	}

}

删除hbm配置文件

把Dept.hbm.xml删除就可以了。