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;
	}
	@Transient
	public String getYourWifeName() {
		return yourWifeName;
	}
	public void setYourWifeName(String yourWifeName) {
		this.yourWifeName = yourWifeName;
	}
	@Id
	public int getId() {
		return id;
	}
	public void setId(int id) {
		this.id = id;
	}
	//Basec默认，一般不加
	@Basic
	public 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>