前些天发现了一个巨牛的人工智能学习网站，通俗易懂，风趣幽默，忍不住分享一下给大家。点击跳转到教程。
1. 报错：ORA-01841: (完整) 年份值必须介于 -4713 和 +9999 之间, 且不为 0
2. 我的sql是：
<!-- 查询 推荐下载记录 --><select id="selectAllRecommendRecord" parameterType="RecommendRecord" resultMap="RecommendRecordResultMap">SELECT distinct(theUser.ACCOUNT) AS ACCOUNT,theUser.id AS ID, theUser.REGISTER_DATE AS REGISTER_DATE,theUser.PROVINCE AS PROVINCE,theUser.REGIOIN AS REGIOIN,record.CREATE_DATE, product.FORMAT AS FORMAT, record.STATUS, record.IS_NOTIFY, record.DOWNLOAD_COUNTFROM TB_RECOMMEND_RECORD record ,TB_USER theUser ,TB_RECOMMEND_PRODUCT product<where>record.USER_ID = theUser.IDAND record.RECOMMEND_ID = product.ID<if test="account != null and account != ''">AND theUser.ACCOUNT LIKE '%'||#{account}||'%'</if><if test="regioin != null and regioin != ''">AND theUser.regioin LIKE '%'||#{regioin}||'%'</if><if test="province != null and province != ''">AND theUser.province LIKE '%'||#{province}||'%'</if><if test="status != null and status != '' and status.code != null and status.code != ''" >AND record.STATUS = #{status.code}</if><if test="startDate != null and startDate != ''">AND record.CREATE_DATE >= TO_DATE(#{startDate},'yyyy-mm-dd hh24:mi:ss')</if><if test="endDate != null and endDate != ''">AND record.CREATE_DATE <![CDATA[ <= ]]> TO_DATE(#{endDate},'yyyy-mm-dd hh24:mi:ss')</if></where>GROUP BY ACCOUNT ,theUser.REGISTER_DATE, PROVINCE,REGIOIN, record. CREATE_DATE, FORMAT, STATUS, IS_NOTIFY, DOWNLOAD_COUNT, theUser.idORDER BY DOWNLOAD_COUNT DESC</select>3. 我的年份本身没有问题，问题是startDate和endDate 这2个参数。本来是在页面上作了时间条件查询，后来不要了，我忘记了去掉sql中对时间的过滤。
于是传给sql的startDate和endDate 的值都是undefine。就报这个错了。我这情况去掉这2个时间过滤，这个sql就OK 了。
