ibatis 兼顾效率的十种写法，ibatis十种,iBatis一些非见用法
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ibatis 兼顾效率的十种写法，ibatis十种,iBatis一些非见用法
iBatis一些非见用法，基本上解决所有棘手问题，下面总结如下：
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>
9、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>
10、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.idvid, a.img imgurl, a.img_s imgfile, b.vfilename vfilename, b.namename, c.idsid, c.url url, c.filenamefilename, c.statusstatus </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>
注意：在使用Map作为结果集返回类型时候，必须这么设置结果集类型resultClass="java.util.HashMap"，这时候，需要根据字段的名称来取值，值类型为Object，key类型为String，这点要注意了： 定义的DAO方法实现如下：
public List<Map<String,Object>> findUndownFiles(Map map) { return getSqlMapClientTemplate().queryForList("secfiles.getUndownFiles", map); }通过DAO读取并操作Map结果集数据：
public void test_findUndownFiles() { List<Map<String, Object>> co = ser.findUndownFiles(new HashMap()); StringBuilder s = new StringBuilder(); for (Map<String, Object> map : co) { System.out.println("^^^^^^^^^^^^^^^^^^^^^"); for (Map.Entry<String, Object> entry : map.entrySet()) { System.out.print(entry.getKey()+"/t"); System.out.println(entry.getValue()); } } }打印结果：
sid1 vfilename200905252009235799 urlhttp://d18.v.iask.com/f/1/f47817a394730dc682e660b943e84cc41006606.flv status0 filename200905252009235799-00.flv imgfile200905252009234399.jpg vid1 imgurlhttp://p4.v.iask.com/95/595/1757503_1.jpg ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ sid2130 vfilename2009062615063867492 urlhttp://lz.dhot.v.iask.com/f/1/0ee2ae8b973988f6a93c071c8045ca5217266409.mp4 status0 filename2009062615063867492-00.mp4 imgfile2009062615063825434.jpg vid93 imgurlhttp://cache.mars.sina.com.cn/nd/movievideo//thumb/2/1502_120160.jpg ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ sid2131 vfilename2009062615064184076 urlhttp://lz5.dhot.v.iask.com/f/1/36d3dadacb8d6bda434a58e7418ad3cc19037464.flv status0 filename2009062615064184076-00.flv imgfile2009062615064136733.jpg vid94 imgurlhttp://cache.mars.sina.com.cn/nd/movievideo//thumb/6/2106_120160.jpg
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