二十一、Mybatis之一对多时，PageHelp分页失败的解决办法： Mybatis之懒加载

当Mybatis中涉及到1对多查询时，PageHelp分页会失败，具体说明参见：
本文章说明参见 mybatis 使用 PageHelper 实现一对多正确分页

本文只贴示例代码：

<mapper namespace="com.bms.dao.UserDao">
    <resultMap id="UserMap" type="User">
        <id column="id" jdbcType="INTEGER" property="id" />
        <result column="name" jdbcType="VARCHAR" property="name" />
        <result column="phone" jdbcType="VARCHAR" property="phone" />
        <result column="telephone" jdbcType="VARCHAR" property="telephone" />
        <result column="address" jdbcType="VARCHAR" property="address" />
        <result column="enabled" jdbcType="BOOLEAN" property="enabled" />
        <result column="username" jdbcType="VARCHAR" property="username" />
        <result column="password" jdbcType="VARCHAR" property="password" />
        <result column="userface" jdbcType="VARCHAR" property="userface" />
        <result column="remark" jdbcType="VARCHAR" property="remark" />
    resultMap>
    <resultMap id="lazyLoadRolesMap" type="User" extends="UserMap">
        <collection property="roles" ofType="Role" select="com.bms.dao.UserDao.getRolesById" column="id"/>
    resultMap>
    <resultMap id="eagerLoadRolesMap" type="User" extends="UserMap">
        <collection property="roles" ofType="Role">
            <id column="rid" property="id"/>
            <result column="rname" property="name"/>
            <result column="rnameZh" property="nameZh"/>
        collection>
    resultMap>
    
    <select id="getUsersByKeyWords" parameterType="String" resultMap="lazyLoadRolesMap">
        SELECT id,name,phone,telephone,address,enabled,remark
        FROM user
        WHERE id NOT IN (
        SELECT ur.user_id FROM user_role ur,role r
        WHERE ur.role_id=r.id
        AND r.name = '${@com.bms.util.FinalName@ROLE_ADMIN}'
        )
        <if test="keyWords != 'all'">
            AND name LIKE concat('%',#{keyWords},'%')
        if>
        ORDER BY id ASC
    select>
mapper>