IBatis模糊查询
<!-- 在ibatis中使用安全的拼接语句,动态查询 ibatis比JDBC的优势之一,安全高效 说明文字在注释中 --> <select id="selectAllProducts" parameterClass="Product" resultMap="ProductResult"> select id,note from Product <dynamic prepend="WHERE"> <!-- isNotNull判断参数是否存在,Integer类型 --> <isNotNull property="id"> <!-- isGreaterThan判断参数是否大于compareValue,isGreaterEquals是大于等于 --> <isGreaterThan prepend=" and " property="id" compareValue="0"> id = #id# </isGreaterThan> </isNotNull> <!-- isNotEmpty判断字串不为空,isEmpty可以判断字串为空 --> <isNotEmpty prepend=" and " property="note"> <!-- 模糊查询不能用#,#在是用prepareStatement的?插入参数,$是文本替换 --> note like '%$note$%' </isNotEmpty> </dynamic> </select>
用Map传参数
<select id="selectAllProducts" parameterClass="java.util.HashMap" resultMap="ProductResult"> select id,note from Product <dynamic prepend="WHERE"> <!-- isPropertyAvailable判断属性是否有效 --> <isPropertyAvailable property="id"> <isNotNull property="id"> <!-- isLessThan判断参数是否小于compareValue,isLessEquals是小于等于 --> <isLessThan prepend=" and " property="id" compareValue="10"> id = #id# </isLessThan> </isNotNull> </isPropertyAvailable> </dynamic> </select> <!--------------------------------------------------------------------几个常用属性--> <isPropertyAvailable> 属性是存在 <isNotPropertyAvailable> 属性不存在 <isNull> 属性值是null <isEmpty> 判断Collection.size<1或String.length()<1 <isEqual> 等于 <isNotEqual> 不等于 <isGreaterThan> 大于 <isGreaterEqual> 大于等于 <isLessThan> 小于 <isLessEqual> 小于等于