MyBatis-主键回填

ibatis使用主键回填的步骤

1. 在mapper文件中,设置两个属性.
   keyProperty : 指定POJO中主键的属性名称;
   useGeneratedKeys : 设置true,使用数据库内部生成的主键;

   <insert id="auto_PK_test" keyProperty="id" 
   	useGeneratedKeys="true">               
   	insert emp(name) value(#{name})        
   insert>                                                                      
   

2. 取出ibatis主键回填的值.
   sql语句执行成功后,ibatis会自动将数据库自动生成的主键值
   赋值到对应的POJO的主键属性上.

   SqlSession session = sql_session_factory.openSession();
   Auto_PK_mapper dao = session.getMapper(Auto_PK_mapper.class);
   
   Emp obj = new Emp();
   obj.setName("xiao_zhu");
   boolean result = dao.auto_PK_test(obj);
   log.info(result);
   session.commit();
   
   log.info(obj.getId());
   

3. 校验输出信息部分截取.

   DEBUG 2019-01-11 23:11:27,281 org.apache.ibatis.transaction.jdbc.JdbcTransaction : Opening JDBC Connection
   DEBUG 2019-01-11 23:11:27,559 org.apache.ibatis.datasource.pooled.PooledDataSource : Created connection 12394814.
   DEBUG 2019-01-11 23:11:27,563 org.apache.ibatis.transaction.jdbc.JdbcTransaction : Setting autocommit to false on JDBC Connection [   com.mysql.jdbc.JDBC4Connection@bd213e]
   DEBUG 2019-01-11 23:11:27,563 org.apache.ibatis.logging.jdbc.BaseJdbcLogger : ==>  Preparing: insert emp(name) value(?) 
   DEBUG 2019-01-11 23:11:27,606 org.apache.ibatis.logging.jdbc.BaseJdbcLogger : ==> Parameters: xiao_zhu(String)
   DEBUG 2019-01-11 23:11:27,610 org.apache.ibatis.logging.jdbc.BaseJdbcLogger : <==    Updates: 1
    INFO 2019-01-11 23:11:27,610 siye.ibatis.test.Auto_PK_test : true
   DEBUG 2019-01-11 23:11:27,610 org.apache.ibatis.transaction.jdbc.JdbcTransaction : Committing JDBC Connection [com.mysql.jdbc.JDBC4Connection@bd213e]
    INFO 2019-01-11 23:11:27,633 siye.ibatis.test.Auto_PK_test : 12