Escape

    select 

    Ref_Code.CODE_KEY as codeKey,

    REF_CODE.CODE_DESCN as codeDescn

    FROM Ref_Code

    WHERERef_Code.CODE_TYPE = #{codeType,jdbcType=VARCHAR}

ANDRef_Code.CODE_KEY like '%\_'||#{codeKey,jdbcType=VARCHAR} escape '\'

AND Ref_Code.IND_REC_STATUS = 'A'

Order by Ref_Code.SORT_SEQ

<![CDATA[ 

        where rownum < 200

        ]]>