Hibernate---基础配置之日志信息slf 及搭建日志环境

slf日志接口, 实现有slf4j nodep, log4j

hibernate里我们一般用 log4j,所以删除之前创建的hibernate 包里的 slf4j-nop包, 加入log4j-1.2.17.jar

现在hibernate的包里有slf的api 的jar, 不能和log4j 自动匹配, 所以中间需要一个接口, 再加入 slf4j-log4j 的包 (1.5.8)

这样在运行界面就可以看到有建表等语句.

ddl语句就出来了:

14:00:20,587  INFO SchemaExport:179 - exporting generated schema to database
14:00:20,588 DEBUG SchemaExport:303 - drop table if exists Teacher
14:00:20,890 DEBUG SchemaExport:303 - drop table if exists student
14:00:21,022 DEBUG SchemaExport:303 - create table Teacher (id integer not null, name varchar(255), title varchar(255), primary key (id))
14:00:21,309 DEBUG SchemaExport:303 - create table student (id integer not null, name varchar(255), age integer, primary key (id))
14:00:21,530  INFO SchemaExport:196 - schema export complete

因为debug信息太多, 只保留数据库信息可以将log4j.properties里的内容只保留下面2句, 其余都屏蔽:

log4j.rootLogger=warn, stdout
log4j.logger.org.hibernate.tool.hbm2ddl=debug

最后ddl日志信息如下:

14:13:24,066  INFO SchemaExport:154 - Running hbm2ddl schema export
14:13:24,068 DEBUG SchemaExport:170 - import file not found: /import.sql
14:13:24,068  INFO SchemaExport:179 - exporting generated schema to database
14:13:24,069 DEBUG SchemaExport:303 - drop table if exists Teacher
14:13:24,193 DEBUG SchemaExport:303 - drop table if exists student
14:13:24,279 DEBUG SchemaExport:303 - create table Teacher (id integer not null, name varchar(255), title varchar(255), primary key (id))
14:13:24,372 DEBUG SchemaExport:303 - create table student (id integer not null, name varchar(255), age integer, primary key (id))
14:13:24,552  INFO SchemaExport:196 - schema export complete
Hibernate: insert into Teacher (name, title, id) values (?, ?, ?)

搭建junit日志环境

preferrence里新建MyJUnit包, 加入junit包, 然后再项目右键add libary把自己的MyJUnit导入进项目.

1. 创建测试代码包: 项目右键 new --- source folder---test, 里面装测试代码, src里面都是项目代码　　

2. 给test创建一个和上面model一样的package, 然后创建测试类 TeacherTest.java的unit test, 代码如下:

package com.bjsxt.hibernate.model;

import static org.junit.Assert.*;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.AnnotationConfiguration;
import org.hibernate.cfg.Configuration;
import org.junit.Test;

public class TeacherTest {

	@Test
	public void testTeacherSave() {
		Teacher t =new Teacher();
		t.setId(4);
		t.setName("wdfd");
		t.setTitle("high");

		Configuration cfg=new AnnotationConfiguration();
		SessionFactory sf=cfg.configure().buildSessionFactory(); //默认找hibernate.cfg.xml,然后产生一个connection工厂
		Session session =  sf.openSession();
		session.beginTransaction();
		session.save(t);
		session.getTransaction().commit();
		session.close();
		sf.close();
	}

}

上面代码中每次创建sessionFactory比较费时, 所以考虑用beforeclass和afterclass:

package com.bjsxt.hibernate.model;

import static org.junit.Assert.*;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.AnnotationConfiguration;
import org.hibernate.cfg.Configuration;
import org.junit.AfterClass;
import org.junit.BeforeClass;
import org.junit.Test;

public class TeacherTest {
	private static SessionFactory sf=null;
	@BeforeClass
	public static void beforeClass(){
		sf=new AnnotationConfiguration().configure().buildSessionFactory();
	}
	@Test
	public void testTeacherSave() {
		Teacher t =new Teacher();
		t.setId(4);
		t.setName("wdfd");
		t.setTitle("high");

		Session session =  sf.openSession();
		session.beginTransaction();
		session.save(t);
		session.getTransaction().commit();
		session.close();
		sf.close();
	}
	@AfterClass
	public static void afterClass(){
		sf.close();
	}
}

有时test文件会出错, 无法追踪, 需要在 方法加try catch:

	@BeforeClass
	public static void beforeClass(){
		try {
			sf=new AnnotationConfiguration().configure().buildSessionFactory();
		} catch (HibernateException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
	}

或者加一个main方法, 调用beforeClass();