mysql 获取自增主键

MyBatis 3.2.6插入时候获取自增主键方法有二以MySQL5.5为例：方法1：<insert id="insert" parameterType="Person" useGeneratedKeys="true" keyProperty="id">insert into person(name,pswd) values(#{name},#{pswd})</insert>方法2：<insert id="insert" parameterType="Person"><selectKey keyProperty="id" resultType="long">select LAST_INSERT_ID()</selectKey>insert into person(name,pswd) values(#{name},#{pswd})</insert>插入前实体id属性为0；插入后实体id属性为保存后自增的id；