2013年9月8日

摘要： String sql = "from User u left join u.card"; 只需要指定本身用于连接的字段，具体连接到哪个表是在实体类中配置好了的 @OneToMany(cascade=CascadeType.ALL,fetch=FetchType.LAZY) @JoinColumn(name="card_id",referencedColumnName="name") public Set getCard() { return card; }public void testHQL(){ SessionFactory se 阅读全文

摘要： package test.com.lesson5;import javax.print.attribute.standard.Finishings;import org.hibernate.Session;import org.hibernate.SessionFactory;import org.hibernate.Transaction;import org.hibernate.cfg.AnnotationConfiguration;import com.lesson5.User;import junit.framework.TestCase;public class TestUser e 阅读全文

摘要： 通过一张中间表存储两个表之间的关联关系@ManyToMany(cascade=CascadeType.ALL,fetch=FetchType.LAZY)@JoinTable(name="user_card",joinColumns={@JoinColumn(name="id1")},inverseJoinColumns={@JoinColumn(name="id2")})package com.lesson4;import java.io.Serializable;import java.util.HashSet;import jav 阅读全文

摘要： package com.lesson3;import java.io.Serializable;import java.util.HashSet;import java.util.Set;import javassist.expr.NewArray;import javax.persistence.CascadeType;import javax.persistence.Column;import javax.persistence.Entity;import javax.persistence.FetchType;import javax.persistence.GeneratedValue 阅读全文

摘要： 创建主键类，@Embeddable 实现 Serializable 重写 equals和hashCode方法package com.lesson1;import java.io.Serializable;import javax.persistence.Embeddable;@Embeddable public class UserPk implements Serializable{ @Override public boolean equals(Object obj) { // TODO Auto-generated method stub retu... 阅读全文

摘要： package com.lesson2;import javax.persistence.CascadeType;import javax.persistence.Entity;import javax.persistence.FetchType;import javax.persistence.GeneratedValue;import javax.persistence.GenerationType;import javax.persistence.Id;import javax.persistence.JoinColumn;import javax.persistence.ManyToO 阅读全文

摘要： package com.lesson1;public class User { private int id; private String name; public int getId() { return id; } public void setId(int id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name ... 阅读全文