MyBatis動態SQL標籤用法
一、動態SQL片斷java
< 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$%'
</ isNotEmpty >
< isNotEmpty prepend ="and" property ="area_id" >
area_id = #area_id#
</ isNotEmpty >
< isNotEmpty prepend ="and" property ="hided" >
hided = #hided#
</ isNotEmpty >
</ dynamic >
< dynamic prepend="" >
< isNotNull property ="_start" >
< isNotNull property ="_size" >
limit #_start#, #_size#
</ isNotNull >
</ isNotNull >
</ dynamic >
</ sql >
< select id ="findByParamsForCount" parameterClass ="map" resultClass ="int" >
< include refid ="sql_count" />
< include refid ="sql_where" />
</ select >
< select id ="findByParams" parameterClass ="map" resultMap ="icp.result_base" >
< include refid ="sql_select" />
< include refid ="sql_where" />
</ select >
<![CDATA[
img_size >= #_img_size_ge#
]]>
</ isNotEmpty >
< isNotEmpty prepend ="and" property ="_img_size_lt" >
<![CDATA[
img_size < #_img_size_lt#
]] >
</ isNotEmpty >
<![CDATA[
execplantime >= #_now#
]]>
</ isNotEmpty >
< isNotEmpty prepend ="and" property ="_now" >
<![CDATA[
closeplantime < = #_now#
]] >
</ isNotEmpty >
< isNotEmpty prepend ="and" property ="_endtime" >
<![CDATA[
createtime >= #_starttime#
and createtime < #_endtime#
]] >
</ isNotEmpty >
</ isNotEmpty >
state in ('$_in_state$')
</ isNotEmpty >
(chnameone like '%$chnameone$%' or spellinitial like '%$chnameone$%')
</ isNotEmpty >
< isNotEmpty prepend ="and" property ="chnametwo" >
chnametwo like '%$chnametwo$%'
</ isNotEmpty >
<![CDATA[
(t.finished='11' or t.failure=3)
]]>
</ isEqual >
<![CDATA[
t.finished in ('10','19') and t.failure < 3
]] >
</ isEqual >
< 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 *
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 >
< 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 >
< 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 >
<!-- 返回沒有下載的記錄總數 -->
< select id ="getUndownFilesForCount" parameterClass ="map" resultClass ="int" >
< include refid ="sql_count" />
< include refid ="sql_where" />
</ select >
<!-- 返回沒有下載的記錄 -->
< select id ="getUndownFiles" parameterClass ="map" resultClass ="java.util.HashMap" >
< include refid ="sql_select" />
< include refid ="sql_where" />
</select>
十一、trim
trim是更靈活的去處多餘關鍵字的標籤，他能夠實踐where和set的效果。sql
where例子的等效trim語句：數據庫
Xml代碼
<!-- 查詢學生list，like姓名，=性別 -->
<select id="getStudentListWhere" parameterType="StudentEntity" resultMap="studentResultMap">
SELECT * from STUDENT_TBL ST
<trim prefix="WHERE" prefixOverrides="AND|OR">
<if test="studentName!=null and studentName!='' ">
ST.STUDENT_NAME LIKE CONCAT(CONCAT('%', #{studentName}),'%')
</if>
<if test="studentSex!= null and studentSex!= '' ">
AND ST.STUDENT_SEX = #{studentSex}
</if>
</trim>
</select> ide
set例子的等效trim語句：函數
Xml代碼
<!-- 更新學生信息 -->
<update id="updateStudent" parameterType="StudentEntity">
UPDATE STUDENT_TBL
<trim prefix="SET" suffixOverrides=",">
<if test="studentName!=null and studentName!='' ">
STUDENT_TBL.STUDENT_NAME = #{studentName},
</if>
<if test="studentSex!=null and studentSex!='' ">
STUDENT_TBL.STUDENT_SEX = #{studentSex},
</if>
<if test="studentBirthday!=null ">
STUDENT_TBL.STUDENT_BIRTHDAY = #{studentBirthday},
</if>
<if test="classEntity!=null and classEntity.classID!=null and classEntity.classID!='' ">
STUDENT_TBL.CLASS_ID = #{classEntity.classID}
</if>
</trim>
WHERE STUDENT_TBL.STUDENT_ID = #{studentID};
</update> url
十二、choose (when, otherwise)
有時候咱們並不想應用全部的條件，而只是想從多個選項中選擇一個。MyBatis提供了choose 元素，按順序判斷when中的條件出否成立，若是有一個成立，則choose結束。當choose中全部when的條件都不滿則時，則執行 otherwise中的sql。相似於Java 的switch 語句，choose爲switch，when爲case，otherwise則爲default。
if是與(and)的關係，而choose是或（or）的關係。spa
例以下面例子，一樣把全部能夠限制的條件都寫上，方面使用。選擇條件順序，when標籤的從上到下的書寫順序：code
Xml代碼
<!-- 查詢學生list，like姓名、或=性別、或=生日、或=班級，使用choose -->
<select id="getStudentListChooseEntity" parameterType="StudentEntity" resultMap="studentResultMap">
SELECT * from STUDENT_TBL ST
<where>
<choose>
<when test="studentName!=null and studentName!='' ">
ST.STUDENT_NAME LIKE CONCAT(CONCAT('%', #{studentName}),'%')
</when>
<when test="studentSex!= null and studentSex!= '' ">
AND ST.STUDENT_SEX = #{studentSex}
</when>
<when test="studentBirthday!=null">
AND ST.STUDENT_BIRTHDAY = #{studentBirthday}
</when>
<when test="classEntity!=null and classEntity.classID !=null and classEntity.classID!='' ">
AND ST.CLASS_ID = #{classEntity.classID}
</when>
<otherwise>
</otherwise>
</choose>
</where>
</select> rem
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- 1. Mybatis之動態sql標籤
- 2. mybatis的常用動態sql標籤
- 3. 13.MyBatis-動態SQL-sql-foreach標籤
- 4. MyBatis系列(八)：MyBatis動態Sql之foreach標籤的用法
- 5. mybatis 動態sql語句，各種標籤
- 6. MyBatis-------＞動態sql（where、set、if、delete）標籤
- 7. mybatis學習--動態sql之foreach標籤
- 8. mybatis中映射文件的SQL深入：動態SQL標籤、標籤、標籤
- 9. 動態sql標籤trim的用法
- 10. Mybatis【13】-- Mybatis動態Sql標籤的使用