特殊字符 替代符号 & & < < > > " " ' ' 小于等于 a<=b a <= b a <![CDATA[<= ]]>b大于等于 a>=b a >= b a <![CDATA[>= ]]>b不等于 a!=b a <![CDATA[ <> ]]>b a <![CDATA[!= ]]>b例子:AND <![CDATA[ province_id = #{provinceId} ]]>AND <![CDATA[ id <> #{id} ]]>