兼顾效率，iBatis一些非见用法(10条)

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.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>