iBatis动态标签的用法

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>