第一种写法：

原符号	<	<=	>	>=	&	'	"
替换符号	&lt;	&lt;=	&gt;	&gt;=	&amp;	&apos;	&quot;

SQL示例如下：

 select * from (
            select * from (<include refid="baseOrderInfoVo" />) a
            union all
            select * from (<include refid="baseOrderReturnVo" />) b
            union all
            select * from (<include refid="baseSpjhdVo" />) c
        ) billdtovo
        <where>
            <if test="term.q!=null and term.q!='' "> and djbh like concat('%',#{term.q},'%') </if>
            <if test="term.djlx!=null and term.djlx!='' ">and  djlx=#{term.djlx} </if>
            <if test="term.state!=null  ">and  status=#{term.state} </if>
            <if test="term.rqf!=null and term.rqf!='' "> and rq &gt;= #{term.rqf} </if>
            <if test="term.rqt!=null and term.rqt!='' "> and rq &lt;= #{term.rqt} </if>
        </where>
        order by djlx,rq,djbh

第二种写法：

大于等于	<![CDATA[ >= ]]>
小于等于	<![CDATA[ <= ]]>

SQL示例如下：

   select * from (
            select * from (<include refid="baseOrderInfoVo" />) a
            union all
            select * from (<include refid="baseOrderReturnVo" />) b
            union all
            select * from (<include refid="baseSpjhdVo" />) c
        ) billdtovo
        <where>
            <if test="term.q!=null and term.q!='' "> and djbh like concat('%',#{term.q},'%') </if>
            <if test="term.djlx!=null and term.djlx!='' ">and  djlx=#{term.djlx} </if>
            <if test="term.state!=null  ">and  status=#{term.state} </if>
            <if test="term.rqf!=null and term.rqf!='' "> and rq <![CDATA[ >= ]]> #{term.rqf} </if>
            <if test="term.rqt!=null and term.rqt!='' "> and rq <![CDATA[ <= ]]> #{term.rqt} </if>
        </where>
        order by djlx,rq,djbh