最近在学heibernate,是看马士兵老师的视频学的,在这里总结一下,做点笔记。关于heibernate的优点,大家可以在网上
百度,这里不做赘述,直接讲怎么使用heibernate
步骤一:新建项目,导入jar包
在这里讲一种新的导入jar包的方法,首先在myEclipse中点击windows>>preferences>>java>>Buid Path>>User Libraries 在右侧点击New ,在打开的窗口中输入"hibernate",点击OK,选择hibernate,点击Add jars,导入所需的jar包,我这里导入的比较多,大家按实际情况导入,然后点击OK;
新建一个java项目,右键BuidPath>>Add Libraries>>User Library 选择hibernate,点击OK,这样就导入hibernate的包了。
接下来还要导入数据库驱动包,根据大家所用数据库的种类自行导入即可
步骤二:新建数据库/数据表
我用的是sqlserver2008,这里贴出我的代码:
CREATE TABLE STUDENT ( STUID INT PRIMARY KEY, STUNAME VARCHAR(10), STUSEX VARCHAR(5), STUGRADE VARCHAR(10), );需要注意的是一定要设置主键,这关系到后面配置文件去连接数据表
步骤三:写javabean
在项目下建包hibernate,建类Student
package hibernate; public class Student { private int stuId; private String stuName; private String stuSex; private String stuGrade; public int getStuId() { return stuId; } public void setStuId(int stuId) { this.stuId = stuId; } public String getStuName() { return stuName; } public void setStuName(String stuName) { this.stuName = stuName; } public String getStuSex() { return stuSex; } public void setStuSex(String stuSex) { this.stuSex = stuSex; } public String getStuGrade() { return stuGrade; } public void setStuGrade(String stuGrade) { this.stuGrade = stuGrade; } }
步骤四:写Student.hbm.xml配置文件
,右键包 hibernate,点击new >>file>>输入Student.hbm.xml,点击OK,下面是我配置文件中的代码:
<?xml version="1.0"?> <!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"> <hibernate-mapping> <class name="hibernate.Student"> <id name="stuId"></id> <property name="stuName"/> <property name="stuSex"/> <property name="stuGrade"/> </class> </hibernate-mapping><class name="hibernate.Student"> name为javabean的路径
<id name="stuId"></id> id中name的值对应主键
步骤五:hibernate.cfg.xml
右键项目,new>>file>>输入hibernate.cfg.xml,文件内容如下:
<?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> <!-- Database connection settings --> <property name="connection.driver_class">com.microsoft.sqlserver.jdbc.SQLServerDriver</property> <property name="connection.url">jdbc:sqlserver://localhost:1433;DatabaseName=Study</property> <property name="connection.username">sa</property> <property name="connection.password">aaaaaa</property> <!-- JDBC connection pool (use the built-in) --> <!-- <property name="connection.pool_size">1</property> --> <!-- SQL dialect --> <property name="dialect">org.hibernate.dialect.HSQLDialect</property> <!-- Echo all executed SQL to stdout --> <property name="show_sql">true</property> <!-- Drop and re-create the database schema on startup --> <property name="hbm2ddl.auto">create</property> <mapping resource="hibernate/Student.hbm.xml"/> </session-factory> </hibernate-configuration>
最后一步:测试类
新建一个包Test,新建类StudentTest:
package test; import org.hibernate.Session; import org.hibernate.SessionFactory; import org.hibernate.cfg.Configuration; import hibernate.Student; public class StudentTest { public static void main(String[] args) { Student s=new Student(); s.setStuId(111); s.setStuName("张三"); s.setStuSex("男"); s.setStuGrade("大二"); Configuration cfg=new Configuration().configure(); SessionFactory sf=cfg.buildSessionFactory(); Session session=sf.openSession(); session.beginTransaction(); session.save(s); session.getTransaction().commit(); session.close(); sf.close(); } }