Hibernate基本配置
1.输出运行的SQL语句和格式化SQL语句：
hibernate.cfg.xml添加属性：
<!-- Echo all executed SQL to stdout -->
<property name="show_sql">true</property>
<!-- 格式化输出SQL语句 -->
<property name="format_sql">true</property>
?
2.如果表名和类名不一致，对表名进行设置
a) Annotation:@Table(name="teacher")
b) xml:<class name="Student" table="student">
?
3.如果字段名和属性名不一致
a) Annotation:@Colume(name="title")
b) xml:<id name="id" column="EVENT_ID">
??<property name="date" type="timestamp" column="EVENT_DATE"/>
?
4.如果字段名和属性相同
a)Annotation:默认不写，@Basic
b)xml:不用写column
?
5.不需要persistence的字段
a)Annotation:@Transient
b)xml:不写
?
6.映射日期与时间类型，指定时间精度
a)Annotation:@Temporal(TemporalType.TIME)
b)xml:指定type
?
7.映射枚举类型
a)Annotation:@Enumerated
b)xml:google查询
?
8.字段映射的位置
a)放置在Field前,便于管理，但不符合封装的特性
b)放置在get方法前
?
eg：
package com.bjsxt.hibernate;import java.util.Date;import javax.persistence.Entity;import javax.persistence.EnumType;import javax.persistence.Enumerated;import javax.persistence.Id;import javax.persistence.Table;import javax.persistence.Temporal;import javax.persistence.TemporalType;import javax.persistence.Transient;import javax.persistence.Basic;import javax.persistence.Column;@Entity@Table(name="_teacher")public class Teacher {private int id;private String name;private String title; private String yourWifeName;private Date birthDate;private boolean good;private Gender gender;@Enumerated(EnumType.STRING)public Gender getGender() {return gender;}public void setGender(Gender gender) {this.gender = gender;}public boolean isGood() {return good;}public void setGood(boolean good) {this.good = good;}@Transientpublic String getYourWifeName() {return yourWifeName;}public void setYourWifeName(String yourWifeName) {this.yourWifeName = yourWifeName;}@Idpublic int getId() {return id;}public void setId(int id) {this.id = id;}//Basec默认，一般不加@Basicpublic String getName() {return name;}public void setName(String name) {this.name = name;}@Column(name="title")public String getTitle() {return title;}public void setTitle(String title) {this.title = title;}@Temporal(TemporalType.TIME)public Date getBirthDate() {return birthDate;}public void setBirthDate(Date birthDate) {this.birthDate = birthDate;}}?
package com.bjsxt.hibernate;public enum Gender {MALE, FEMALE}?
<?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="com.bjsxt.hibernate.Student" table="_student"><id name="id" /><property name="name" /><property name="age" /><property name="sex" /><property name="good" type="yes_no"></property> </class></hibernate-mapping>
?
?