Teacher类：
package org.zxy.model; import java.util.Date; import javax.persistence.Basic; import javax.persistence.Entity; import javax.persistence.Id; import javax.persistence.Table; import javax.persistence.Temporal; import javax.persistence.TemporalType; import javax.persistence.Transient; @Entity public class Teacher { private int id; private String name; private String title; private Date birthday; @Basic @Temporal(TemporalType.TIME) public Date getBirthday() { return birthday; } public void setBirthday(Date birthday) { this.birthday = birthday; } @Id public int getId() { return id; } public void setId(int id) { this.id = id; } @Basic public String getName() { return name; } public void setName(String name) { this.name = name; } public String getTitle() { return title; } public void setTitle(String title) { this.title = title; } }
Student类：
package org.zxy.model; import java.util.Date; public class Student { private String id; private String name; private int age; private Date birthday; public Date getBirthday() { return birthday; } public void setBirthday(Date birthday) { this.birthday = birthday; } public Student() { } public String getId() { return id; } public void setId(String id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public int getAge() { return age; } public void setAge(int age) { this.age = age; } }
用JUnit测试：
TeacherTest:
package org.zxy.model; import java.util.Date; import org.hibernate.Session; import org.hibernate.SessionFactory; import org.hibernate.cfg.AnnotationConfiguration; 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 save(){ Teacher t = new Teacher(); t.setId(4); t.setName("zhangsan"); t.setTitle("chuji"); t.setBirthday(new Date()); Session session = sf.openSession(); session.beginTransaction(); session.save(t); session.getTransaction().commit(); session.close(); } @AfterClass public static void afterClass() { sf.close(); } }
StudentTest:
package org.zxy.model; import org.hibernate.Session; import org.hibernate.SessionFactory; import org.hibernate.cfg.Configuration; import org.junit.AfterClass; import org.junit.BeforeClass; import org.junit.Test; public class StudentTest { public static SessionFactory sf = null; @BeforeClass public static void beforeClass() { sf = new Configuration().configure().buildSessionFactory(); } @Test public void save() { Student stu = new Student(); stu.setName("wangwu"); stu.setAge(4); Session session = sf.openSession(); session.beginTransaction(); session.save(stu); session.getTransaction().commit(); session.close(); } @AfterClass public static void afterClass() { sf.close(); } }
hibernate.cfg.xml:
<?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">oracle.jdbc.driver.OracleDriver</property> <property name="connection.url">jdbc:oracle:thin:@localhost:1521:zxy</property> <property name="connection.username">scott</property> <property name="connection.password">tiger</property> <!-- JDBC connection pool (use the built-in) --> <property name="connection.pool_size">1</property> <!-- SQL dialect --> <property name="dialect">org.hibernate.dialect.OracleDialect</property> <!-- Enable Hibernate's automatic session context management --> <property name="current_session_context_class">thread</property> <!-- Disable the second-level cache --> <property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property> <!-- Echo all executed SQL to stdout --> <property name="show_sql">true</property> <property name="format_sql">true</property> <!-- Drop and re-create the database schema on startup --> <property name="hbm2ddl.auto">update</property> <mapping resource="org/zxy/model/Student.hbm.xml"/> <mapping class="org.zxy.model.Teacher"/> <mapping class="org.zxy.model.Person"/> </session-factory> </hibernate-configuration>
测试StudentTest时，会出现new Configuration()得不到值，出现空指针
改为AnnotationConfiguration()即刻解决问题
