Cause: java.lang.IllegalArgumentException: invalid comparison: java.util.Date and java.lang.String
<if test="examDate != null and examDate != ''">
ExamDate = #{examDate},
</if>改为
<if test="examDate != null">
ExamDate = #{examDate},
</if>Cause: java.lang.IllegalArgumentException: invalid comparison: java.util.Date and java.lang.String
<if test="examDate != null and examDate != ''">
ExamDate = #{examDate},
</if>改为
<if test="examDate != null">
ExamDate = #{examDate},
</if>