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Beginning MyBatis 3 Part 3 : How to Get Table’s Generated Ids

2012-03-08 23:52 295 查看
I have a very simple MySql table with an auto increament primary key,

1
CREATE
TABLE
sampah
2
(
3
id
INT
(10)
NOT
 
NULL
 
AUTO_INCREMENT,
4
name
 
VARCHAR
(30),
5
PRIMARY
 
KEY
 
(id)
6
)
my question is, how can i get my object’s generated primary key if i insert a new object to table “sampah”?

The answer is actually quite easy, as you can see here on my xml sql mapper, take a look an line 11.

01
<?
xml
 
version
=
"1.0"
 
encoding
=
"UTF-8"
 
?>
02
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
03
<
mapper
 
namespace
=
"com.edw.mybatis.mapper.SampahMapper"
 
>
04
05
<
resultMap
 
id
=
"SampahMap"
 
type
=
"com.edw.mybatis.bean.Sampah"
 
>
06
<
id
 
column
=
"id"
 
property
=
"id"
 
jdbcType
=
"INTEGER"
 
/>
07
<
result
 
column
=
"name"
 
property
=
"name"
 
jdbcType
=
"VARCHAR"
 
/>
08
</
resultMap
>
09
10
<
insert
 
id
=
"saveUsingXML"
 
parameterType
=
"com.edw.mybatis.bean.Sampah"
11
useGeneratedKeys
=
"true"
 
keyProperty
=
"id"
 
>
12
insert into sampah(name)
13
values (#{name,jdbcType=VARCHAR})
14
</
insert
>
15
16
</
mapper
>
Here is my main java class, you can see how i got my generated idin line 25.

01
package
 
com.edw.mybatis.main;
02
03
import
 
com.edw.mybatis.bean.Sampah;
04
import
 
com.edw.mybatis.config.MyBatisSqlSessionFactory;
05
import
 
com.edw.mybatis.mapper.SampahMapper;
06
import
 
org.apache.ibatis.session.SqlSession;
07
import
 
org.apache.log4j.Logger;
08
09
public
 
class
 
Main {
10
11
private
 
Logger logger = Logger.getLogger(Main.
class
);
12
13
public
 
Main() {
14
}
15
16
private
 
void
 
testSampah() {
17
SqlSession session = MyBatisSqlSessionFactory.getSqlSessionFactory().openSession();
18
try
 
{
19
SampahMapper sampahMapper = session.getMapper(SampahMapper.
class
);
20
Sampah sampah1 =
new
 
Sampah();
21
sampah1.setName(
"satu satu"
);
22
sampahMapper.saveUsingXML(sampah1);   
23
24
// my generated ID
25
logger.debug(sampah1.getId());
26
27
session.commit();
28
}
finally
 
{
29
session.close();
30
}
31
}
32
33
public
 
static
 
void
 
main(String[] args) {
34
Main main =
new
 
Main();
35
main.testSampah();
36
}
37
}
Easy isnt it?

                                            

                                        

                        
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