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转载自【黑米GameDev街区】 原文链接: http://www.himigame.com/hibernate/789.html
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紧接上一篇,这里Himi直接copy上一篇创建的HelloHibernate项目,然后改名为:HelloAnnonation,Ok;
OK,准备工作:
首先第一步,继续再我们自定义的user libraries 中添加Annotation所需的包,如下3个jar包(共11个包):
/hibernate-annotations-3.4.0.GA/hibernate-annotations.jar (核心包)
/hibernate-annotations-3.4.0.GA/lib/ejb3-persistence.jar (jpa)
/hibernate-annotations-3.4.0.GA/lib/hibernate-commons-annotations.jar (反射所需的包)
如下图 ;
然后我们新建一个People类,如下:
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package
com.himi;
public
class
People {
private
int
id;
private
String name;
private
int
age;
private
String title;
private
String birthday;
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 = name;
}
public
int
getAge() {
return
age;
}
public
void
setAge(
int
age) {
this
.age = age;
}
public
String getTitle() {
return
title;
}
public
void
setTitle(String title) {
this
.title = title;
}
public
String getBirthday() {
return
birthday;
}
public
void
setBirthday(String birthday) {
this
.birthday = birthday;
}
}
|
最后准备工作在我们数据库中新建一个对应映射people实体类的表:(不赘述,直接看操作过程)
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mysql> use hibernate;
Reading
table
information
for
completion
of
table
and
column
names
You can turn
off
this feature
to
get a quicker startup
with
-A
Database
changed
mysql>
create
table
people(id
int
primary
key
,
name
varchar
(20),age
int
,title
varchar
(20), birthday
varchar
(20) );
Query OK, 0
rows
affected (0.06 sec)
mysql> describe people;
+
----------+-------------+------+-----+---------+-------+
| Field | Type |
Null
|
Key
|
Default
| Extra |
+
----------+-------------+------+-----+---------+-------+
| id |
int
(11) |
NO
| PRI |
NULL
| |
|
name
|
varchar
(20) | YES | |
NULL
| |
| age |
int
(11) | YES | |
NULL
| |
| title |
varchar
(20) | YES | |
NULL
| |
| birthday |
varchar
(20) | YES | |
NULL
| |
+
----------+-------------+------+-----+---------+-------+
5
rows
in
set
(0.01 sec)
|
准备工作完成之后,那么如果通常我们会建立People.hbm.xml来对应数据库的组件和属性,然后将People在hibernate.cfg.xml配置文件中使用mapping resource声明我们有一个被加了映射,People是实体类;
但是本篇我们使用Annotation将不再创建对应的实体类对应数据库的xml,而是直接在People类中声明实体类就可以啦,修改People.java文件如下:
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package
com.himi;
import
javax.persistence.Entity;
import
javax.persistence.Id;
@Entity
public
class
People {
private
int
id;
private
String name;
private
int
age;
private
String title;
private
String birthday;
@Id
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 = name;
}
public
int
getAge() {
return
age;
}
public
void
setAge(
int
age) {
this
.age = age;
}
public
String getTitle() {
return
title;
}
public
void
setTitle(String title) {
this
.title = title;
}
public
String getBirthday() {
return
|