부등호를 그냥 써려니까 쿼리 에러났음
<select id="selectUnviewedFileList" parameterType="string" resultType="com.custom.common.pdfConvert.vo.PdfConvertVO">
SELECT SECURE_ID
FROM PDF_CONVERT_MAPPING
WHERE REG_DATE < #{standardDate}
</select>
<![CDATA[ < ]]>
이런식으로 데이터 감싸주어야했음
<select id="selectUnviewedFileList" parameterType="string" resultType="com.custom.common.pdfConvert.vo.PdfConvertVO">
SELECT SECURE_ID
FROM PDF_CONVERT_MAPPING
WHERE REG_DATE <![CDATA[ < ]]> #{standardDate}
</select>