mybatis执行insert返回主键

1.第一种方式

• 对应的xxxMapper.xml

<insert id="insertDemoReturnPrimaryKey1"
       parameterType="com.fcmap.ssm.domain.Demo" 
 useGeneratedKeys="true"
       keyProperty="id">
       insert into DEMO (id,name) values  (#{id},#{name});
    </insert>

• 对应的测试方法

@Test
    public void  testinsertDemoReturnPrimaryKey1() {
        Demo demo1 = new Demo(null, "测试111");
        Integer row =  demoDao.insertDemoReturnPrimaryKey1(demo1);
        System.out.println("影响的行数     " +  row);
        System.out.println(demo1.getId());
    }

2.第二种方式

• 对应的xxxMapper.xml

 <insert id="insertDemoReturnPrimaryKey2"
       parameterType="com.fcmap.ssm.domain.Demo">
       <selectKey  resultType="java.lang.Integer" order="AFTER"
           keyProperty="id">
           SELECT LAST_INSERT_ID() AS id
       </selectKey>
       insert into DEMO (id,name) values  (#{id},#{name});
    </insert>

• 对应的测试的方法

 @Test
    public void  testinsertDemoReturnPrimaryKey2() {
        Demo demo1 = new Demo(null, "测试111");
        Integer row =  demoDao.insertDemoReturnPrimaryKey2(demo1);
        System.out.println("影响的行数     " +  row);
        System.out.println(demo1.getId());
    }