详解MyBatis动态SQL标签用法
详解MyBatis动态SQL标签用法
本文通过实例代码给大家介绍了MyBatis动态SQL标签用法，具有参考借鉴价值，需要的朋友可以参考一下。想了解更多相关信息请持续关注我们店铺!
1、动态SQL片段
通过SQL片段达到代码复用
<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$%'
</isNotEmpty>
<isNotEmpty prepend="and" property="area_id">
area_id = #area_id#
</isNotEmpty>
<isNotEmpty prepend="and" property="hided">
mysql语句的执行顺序hided = #hided#
</isNotEmpty>
</dynamic>
<dynamic prepend="">
<isNotNull property="_start">
<isNotNull property="_size">
limit #_start#, #_size#
</isNotNull>
</isNotNull>
</dynamic>
</sql>
<select id="findByParamsForCount" parameterClass="map" resultClass="int">
electricity咋读<include refid="sql_count"/>
<include refid="sql_where"/>
</select>
<select id="findByParams" parameterClass="map" resultMap="sult_base">
<include refid="sql_select"/>
<include refid="sql_where"/>
</select>
2、数字范围查询
所传参数名称是捏造所得，非数据库字段，比如_img_size_ge、_img_size_lt字段
<isNotEmpty prepend="and" property="_img_size_ge">
<![CDATA[
img_size >= #_img_size_ge#
]]>
</isNotEmpty>
<isNotEmpty prepend="and" property="_img_size_lt">
<![CDATA[
img_size < #_img_size_lt#
]]>
教育视频网公开课视频</isNotEmpty>
多次使用一个参数也是允许的
<isNotEmpty prepend="and" property="_now">
<![CDATA[
execplantime >= #_now#
]]>
</isNotEmpty>clonenode true
<isNotEmpty prepend="and" property="_now">
<![CDATA[
closeplantime <= #_now#
]]>
</isNotEmpty>
3、时间范围查询
<isNotEmpty prepend="" property="_starttime">
<isNotEmpty prepend="and" property="_endtime">
<![CDATA[
jquery插件库下载示例
createtime >= #_starttime#
and createtime < #_endtime#
河内塔问题的最佳解决方案]]>
</isNotEmpty>
</isNotEmpty>
4、in查询
<isNotEmpty prepend="and" property="_in_state">
state in ('$_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
(tcode
from cms_ccm_programcontent t
ttype='MZNRLX_MA'
and t.programcode = #exprogramcode#)
</isEqual>
</isNotEmpty>
</isNotEmpty>
<select id="findByProgramcode" parameterClass="string" resultMap="cms_sult">
select *
from cms_ccm_material
where code in
(tcode
from cms_ccm_programcontent t
ttype = 'MZNRLX_MA'
and programcode = #value#)
order by updatetime desc
</select>
9、函数的使用
< id="" parameterClass="RuleMaster">
into rulemaster(
name,
createtime,
updatetime,
remark
) values (
#name#,
now(),
now(),
#remark#
)
<selectKey keyProperty="id" resultClass="long">
select LAST_INSERT_ID()
</selectKey>
</>
<id="update" parameterClass="RuleMaster">
rulemaster set
name = #name#,
updatetime = now(),
remark = #remark#
where id = #id#
</update>
10、map结果集
<sql id="sql_count">
select count(a.*)

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