hibernate之helloword(环境搭建)

Posted 2020-10-15 fjk

 环境搭建

　　　　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>
	
		<property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
		<property name="hibernate.connection.url">jdbc:mysql:///web_shop</property>
		<property name="hibernate.connection.username">root</property>
		<property name="hibernate.connection.password">123</property>
		
		<!-- 设置连接提供者 -->
		<property name="hibernate.connection.provider_class">org.hibernate.connection.C3P0ConnectionProvider</property>
		<!-- c3p0连接池的配置 -->
		<property name="hibernate.c3p0.max_size">20</property> <!-- 最大连接池 -->
		<property name="hibernate.c3p0.min_size">5</property> <!-- 最小连接数 -->
		<property name="hibernate.c3p0.timeout">120</property> <!-- 超时 -->
		<property name="hibernate.c3p0.idle_test_period">3000</property> <!-- 空闲连接 -->

		<!-- 可以将向数据库发送的sql显示出来 -->
		<property name="hibernate.show_sql">true</property>
		<!-- 格式化sql -->
		<property name="hibernate.format_sql">true</property>

		<!-- hibernate的方言 -->
		<property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>

		<!-- 自动创建表 -->
		<!-- <property name="hibernate.hbm2ddl.auto">update</property> -->

		<!-- 用于设置事务提交方式 -->
		<property name="hibernate.connection.autocommit">false</property>

		<!-- 配置hibernate的映射文件所在位置 -->
		<mapping resource="com/baidu/domain/User.hbm.xml"/>
	</session-factory>
</hibernate-configuration>

　　　

　javabean

 

public class User {
	private String uid;
	private String username;
	private String password;
	private String name;
	private String email;
	private String telephone;
	private Date birthday;
	private String sex;
	private Integer state;
	private String code;
	public User() {
		super();
	}
	public User(String username, String password) {
		super();
		this.username = username;
		this.password = password;
	}

	public User(String uid, String username, String password, String name,
			String email, String telephone, Date birthday, String sex,
			Integer state, String code) {
		super();
		this.uid = uid;
		this.username = username;
		this.password = password;
		this.name = name;
		this.email = email;
		this.telephone = telephone;
		this.birthday = birthday;
		this.sex = sex;
		this.state = state;
		this.code = code;
	}
	public String getUid() {
		return uid;
	}
	public void setUid(String uid) {
		this.uid = uid;
	}
	public String getUsername() {
		return username;
	}
	public void setUsername(String username) {
		this.username = username;
	}
	public String getPassword() {
		return password;
	}
	public void setPassword(String password) {
		this.password = password;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public String getEmail() {
		return email;
	}
	public void setEmail(String email) {
		this.email = email;
	}
	public String getTelephone() {
		return telephone;
	}
	public void setTelephone(String telephone) {
		this.telephone = telephone;
	}
	public Date getBirthday() {
		return birthday;
	}
	public void setBirthday(Date birthday) {
		this.birthday = birthday;
	}
	public String getSex() {
		return sex;
	}
	public void setSex(String sex) {
		this.sex = sex;
	}
	public Integer getState() {
		return state;
	}
	public void setState(Integer state) {
		this.state = state;
	}
	public String getCode() {
		return code;
	}
	public void setCode(String code) {
		this.code = code;
	}
	@Override
	public String toString() {
		return "User [uid=" + uid + ", username=" + username + ", password="
				+ password + ", name=" + name + ", email=" + email
				+ ", telephone=" + telephone + ", birthday=" + birthday
				+ ", sex=" + sex + ", state=" + state + ", code=" + code + "]";
	}
	
}

 

 

　　　　xxx.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>
  	  <!--name表示类的全路径名  table表名 catalog表示数据库名 -->
    	<class name="com.baidu.domain.User" table="user" catalog="web_shop">
    		<!-- 表示主键 -->
    		<id name="uid" column="uid">
    			<!-- <generator class="native"></generator> -->
    		</id>		
    		<property name="username" column="username" length="20"></property>
    		<property name="password" column="password" length="20"></property>
    		<property name="name" column="name" length="20"></property>
    		<property name="email" column="email" length="20"></property>
    		<property name="telephone" column="telephone" length="20"></property>
    		<property name="birthday" column="birthday"  ></property>
    		<property name="sex" column="sex" length="10"></property>
    		<property name="state" column="state" length="11"></property>
    		<property name="code" column="code" length="64"></property>
    	</class>
    </hibernate-mapping>

 

　　导包：

                     

                      数据库连接池包

　　　　　　

　　　　　　数据库连接

　　　　　　

　　　　　　hibernate连接池依赖c3p0包

　　　　　　

                    

　　　　创建工具类

public class HibernateUtils {
	private static SessionFactory sessionFactory=null;
	static{
		//获取config  加载配置文件
		Configuration configure = new Configuration().configure();
		sessionFactory = configure.buildSessionFactory();
	}
	//获取session
	public static Session getSession(){
		Session session = sessionFactory.openSession();
		return session;
	}
}

　　测试类:

　　　　　　　　　　@Test //删除方法
		public void test1(){
			// 创建一个User对象
			//保证每个用户去出来的session都不相同
			User user = new User();
			user.setUid("1234");
			Session session = HibernateUtils.getSession(); // 相当于得到一个Connection。
			// 开启事务
			Transaction transaction = session.beginTransaction();
			// 操作
			//删除时必须根据主键进行删除
			session.delete(user);
			// 事务提交
			transaction.commit();
			//不需要关闭Configuration  因为Configuration不是轻量级的。这样一个项目就只产生一个Configuration
			//configuration相当于连接池
			session.close();
		}