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How to Get Table’s Generated Ids

2015-11-27 17:44 232 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 id in 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
SampahMappersampahMapper = session.getMapper(SampahMapper.
class
);
20
Sampahsampah1 = 
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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