之前给大家介绍了一下什么是ibatis，那么下面要接着个大家讲到的就是iBatis动态SQL标签用法方面的内容，一起来看看吧。
1、动态SQL片段
通过SQL片段达到代码复用
<!-- 动态条件分页查询 --> <sql id="sql_count"> select count(*) </sql> <sql id="sql_select"> select * </sql> <sql id="sql_where"> from icp <dynamic prepend="where"> <isNotEmpty prepend="and" property="name"> name like '%$name$%' </isNotEmpty> <isNotEmpty prepend="and" property="path"> path like '%path$%' </isNotEmpty> <isNotEmpty prepend="and" property="area_id"> area_id = #area_id# </isNotEmpty> <isNotEmpty prepend="and" property="hided"> hided = #hided# </isNotEmpty> </dynamic> <dynamic prepend=""> <isNotNull property="_start"> <isNotNull property="_size"> limit #_start#, #_size# </isNotNull> </isNotNull> </dynamic> </sql> <select id="findByParamsForCount" parameterClass="map" resultClass="int"> <include refid="sql_count" /> <include refid="sql_where" /> </select> <select id="findByParams" parameterClass="map" resultMap="icp.result_base"> <include refid="sql_select" /> <include refid="sql_where" /> </select>
2、数字范围查询
所传参数名称是捏造所得，非数据库字段，比如_img_size_ge、_img_size_lt字段
<isNotEmpty prepend="and" property="_img_size_ge"> <![CDATA[ img_size >= #_img_size_ge# ]]> </isNotEmpty> <isNotEmpty prepend="and" property="_img_size_lt"> <![CDATA[ img_size < #_img_size_lt# ]]> </isNotEmpty> 多次使用一个参数也是允许的 <isNotEmpty prepend="and" property="_now"> <![CDATA[ execplantime >= #_now# ]]> </isNotEmpty> <isNotEmpty prepend="and" property="_now"> <![CDATA[ closeplantime <= #_now# ]]> </isNotEmpty>
3、时间范围查询
<isNotEmpty prepend="" property="_starttime"> <isNotEmpty prepend="and" property="_endtime"> <![CDATA[ createtime >= #_starttime# and createtime < #_endtime# ]]> </isNotEmpty> </isNotEmpty>
4、in查询
<isNotEmpty prepend="and" property="_in_state">
state in ('$_in_state$')
</isNotEmpty>5、like查询
<isNotEmpty prepend="and" property="chnameone"> (chnameone like '%$chnameone$%' or spellinitial like '%$chnameone$%') </isNotEmpty> <isNotEmpty prepend="and" property="chnametwo"> chnametwo like '%$chnametwo$%' </isNotEmpty>
6、or条件
<isEqual prepend="and" property="_exeable" compareValue="N">
<![CDATA[
(t.finished='11' or t.failure=3)
]]>
</isEqual>
<isEqual prepend="and" property="_exeable" compareValue="Y">
<![CDATA[
t.finished in ('10','19') and t.failure<3
]]>
</isEqual>7、where子查询
<isNotEmpty prepend="" property="exprogramcode"> <isNotEmpty prepend="" property="isRational"> <isEqual prepend="and" property="isRational" compareValue="N"> code not in (select t.contentcode from cms_ccm_programcontent t where t.contenttype='MZNRLX_MA' and t.programcode = #exprogramcode#) </isEqual> </isNotEmpty> </isNotEmpty> <select id="findByProgramcode" parameterClass="string" resultMap="cms_ccm_material.result"> select * from cms_ccm_material where code in (select t.contentcode from cms_ccm_programcontent t where t.contenttype = 'MZNRLX_MA' and programcode = #value#) order by updatetime desc </select>
8、函数的使用
<!-- 添加 --> <insert id="insert" parameterClass="RuleMaster"> insert into rulemaster( name, createtime, updatetime, remark ) values ( #name#, now(), now(), #remark# ) <selectKey keyProperty="id" resultClass="long"> select LAST_INSERT_ID() </selectKey> </insert> <!-- 更新 --> <update id="update" parameterClass="RuleMaster"> update rulemaster set name = #name#, updatetime = now(), remark = #remark# where id = #id# </update>
9、map结果集
<!-- 动态条件分页查询 --> <sql id="sql_count"> select count(a.*) </sql> <sql id="sql_select"> select a.id vid, a.img imgurl, a.img_s imgfile, b.vfilename vfilename, b.name name, c.id sid, c.url url, c.filename filename, c.status status </sql> <sql id="sql_where"> From secfiles c, juji b, videoinfo a where a.id = b. videoid and b.id = c.segmentid and c.status = 0 order by a.id asc,b.id asc,c.sortnum asc <dynamic prepend=""> <isNotNull property="_start"> <isNotNull property="_size"> limit #_start#, #_size# </isNotNull> </isNotNull> </dynamic> </sql> <!-- 返回没有下载的记录总数 --> <select id="getUndownFilesForCount" parameterClass="map" resultClass="int"> <include refid="sql_count" /> <include refid="sql_where" /> </select> <!-- 返回没有下载的记录 --> <select id="getUndownFiles" parameterClass="map" resultClass="java.util.HashMap"> <include refid="sql_select" /> <include refid="sql_where" /> </select>
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