el-form inline=true model=formInline class=demo-form-inline el-date-picker v-model=value2 type=datetimerange picker-options=pickerOptions

根据上述代码，可以将判断条件写成以下形式：

<if test="startTime != null and endTime != null">
    and createtime between #{startTime} and #{endTime}
</if>
<if test="startTime != null and endTime == null">
    and createtime > #{startTime}
</if>
<if test="startTime == null and endTime != null">
    and createtime < #{endTime}
</if>