Mybatis返回主键

 <insert id="addPerson" parameterType="person">

      /*  keyColumn  表中的主键列名

        keyProperty  实体类中的字段名*/

        <selectKey keyColumn="pid" keyProperty="pid" resultType="int" order="AFTER">

            select last_insert_id();

        </selectKey>

        insert person(pname,address)values(#{pname},#{address})

    </insert>

Sql片段

 <select id="getByCondition3"  resultType="person">

        <include refid="sel"/> where pname=#{name} and address=#{add}

    </select>

    <sql id="sel">

         select *from person

    </sql>

typeAliases别名

 <!--别名-->

    <typeAliases>

        <typeAlias type="com.ujiuye.bean.PersonBean" alias="person"/>

        <typeAlias type="com.ujiuye.bean.StudentBean" alias="student"/>

    </typeAliases>