mybatis 事务内部获取自增主键

mybatis事务内部获取自增主键：

我用的是mysql数据库，用的是spring集成mybatis,

纠结这个问题一年多了，试了很多种方法。以下是需要注意的：

首先mapper.xml代码

  
    
      SELECT LAST_INSERT_ID()
    
    insert into user ( id,create_time, email,
      login_name, nick_name, password, 
      phone_num, city_id, recode_date
      )
    values ( #{id,jdbcType=INTEGER}, #{createTime,jdbcType=TIMESTAMP}, #{email,jdbcType=VARCHAR},
      #{loginName,jdbcType=VARCHAR}, #{nickName,jdbcType=VARCHAR}, #{password,jdbcType=VARCHAR}, 
      #{phoneNum,jdbcType=VARCHAR}, #{cityId,jdbcType=VARCHAR}, #{recodeDate,jdbcType=TIMESTAMP}
      )
  

注意：order是AFTER，或者这一项可以不写，默认order的值就是AFTER,

对于mysql,sqlserver，这类数据库，设置了自增，插入之后就有个自增的值，用order=AFTER

对于orcale,这类，使用序列的数据库，要在之前查询，所以使用order=before

sqlSessionFactory代码

扫描mapper.xml的时候，要用mapperLocations，不要用configLocation，我也不知道原因，反正就是因为这个原因困扰了我一年多。

最后找到原因，不能设置defaultExecutorType=BATCH,不然无法获取自增主键。

java代码：

	@Transactional
	public User register(String email,String password) throws EmailRepeatException {

		User user=new User();
		user.setEmail(email);
		user.setCreateTime(new Date(System.currentTimeMillis()));
		user.setPassword(confusionPassword(password));
		Integer id=userDao.save(user);
		System.out.println("id:"+id);//这儿表示影响的行数
		System.out.println("userid:"+user.getId());//  这样就能获取自增的主键了 ,

		return user;
	}

打印的日志：

13:49:27.319 [main] DEBUG org.mybatis.spring.SqlSessionUtils - Creating a new SqlSession
13:49:27.325 [main] DEBUG org.mybatis.spring.SqlSessionUtils - Registering transaction synchronization for SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@2c48d1fc]
13:49:27.332 [main] DEBUG o.m.s.t.SpringManagedTransaction - JDBC Connection [com.alibaba.druid.proxy.jdbc.ConnectionProxyImpl@313d6965] will be managed by Spring
13:49:27.384 [main] DEBUG c.c.s.dao.mapper.UserMapper.insert - ==>  Preparing: insert into user ( id,create_time, email, login_name, nick_name, password, phone_num, city_id, recode_date ) values ( ?, ?, ?, ?, ?, ?, ?, ?, ? ) 
13:49:27.427 [main] DEBUG c.c.s.dao.mapper.UserMapper.insert - ==> Parameters: null, 2015-05-21 13:49:27.314(Timestamp), [email protected](String), null, null, e9e371ca63793877ceac8f6eacd8d3b5(String), null, null, null
13:49:27.431 [main] DEBUG c.c.s.dao.mapper.UserMapper.insert - <==    Updates: 1
13:49:27.432 [main] DEBUG c.c.s.d.m.U.insert!selectKey - ==>  Preparing: SELECT LAST_INSERT_ID() 
13:49:27.433 [main] DEBUG c.c.s.d.m.U.insert!selectKey - ==> Parameters: 
13:49:27.449 [main] DEBUG c.c.s.d.m.U.insert!selectKey - <==      Total: 1
13:49:27.451 [main] DEBUG org.mybatis.spring.SqlSessionUtils - Releasing transactional SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@2c48d1fc]
id:1
userid:13
13:49:50.913 [main] DEBUG org.mybatis.spring.SqlSessionUtils - Transaction synchronization committing SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@2c48d1fc]
13:49:50.940 [main] DEBUG org.mybatis.spring.SqlSessionUtils - Transaction synchronization closing SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@2c48d1fc]

注意查看：insert 语句和 SELECT LAST_INSERT_ID() 语句在一个事务中，并且SELECT LAST_INSERT_ID()在insert之后。