Mybatis判断map参数是否存在

<select id="selectByCondition" parameterType="java.util.HashMap" resultMap="BaseResultMap">
select
<include refid="Base_Column_List" />
from sys_user
where 1=1
<if test="_parameter.containsKey('sysUserName')">
and sys_user_name=#{sysUserName}
</if>
<if test="_parameter.containsKey('cBeginTime')">
<![CDATA[
and create_time >= #{cBeginTime}
]]>
</if>
<if test="_parameter.containsKey('cEndTime')">
<![CDATA[
and create_time < #{cEndTime}
]]>
</if>
<if test="_parameter.containsKey('uEndTime')">
<![CDATA[
and update_time < #{uEndTime}
]]>
</if>
</select>
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