前言
mybatis的mapper文件中的select、insert、update、delete元素中有一个parametertype属性,用于对应的mapper接口方法接受的参数类型。本文主要给大家介绍了关于mybatis传入参数parametertype类型的相关内容,分享出来供大家参考学习,下面话不多说了,来一起看看详细的介绍吧。
1. mybatis的传入参数parametertype类型分两种
1. 1. 基本数据类型:int,string,long,date;
1. 2. 复杂数据类型:类和map
2. 如何获取参数中的值:
2.1 基本数据类型:#{参数} 获取参数中的值
2.2 复杂数据类型:#{属性名} ,map中则是#{key}
3.案例:
3.1 基本数据类型案例
1
2
3
4
5
6
7
8
9
|
<sql id= "base_column_list" >
id, car_dept_name, car_maker_name, icon,car_maker_py,hot_type
</sql>
<select id= "selectbyprimarykey" resultmap= "baseresultmap" parametertype= "java.lang.long" >
select
<include refid= "base_column_list" />
from common_car_make
where id = #{id,jdbctype=bigint}
</select>
|
3.2 复杂类型--map类型
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
|
<select id= "querycarmakerlist" resultmap= "baseresultmap" parametertype= "java.util.map" >
select
<include refid= "base_column_list" />
from common_car_make cm
where 1 = 1
< if test= "id != null" >
and cm.id = #{id,jdbctype=decimal}
</ if >
< if test= "cardeptname != null" >
and cm.car_dept_name = #{cardeptname,jdbctype=varchar}
</ if >
< if test= "carmakername != null" >
and cm.car_maker_name = #{carmakername,jdbctype=varchar}
</ if >
< if test= "hottype != null" >
and cm.hot_type = #{hottype,jdbctype=bigint}
</ if >
order by cm.id
</select>
|
3.3 复杂类型--类类型
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
|
<update id= "updatebyprimarykeyselective" parametertype= "com.epeit.api.model.commoncarmake" >
update common_car_make
<set >
< if test= "cardeptname != null" >
car_dept_name = #{cardeptname,jdbctype=varchar},
</ if >
< if test= "carmakername != null" >
car_maker_name = #{carmakername,jdbctype=varchar},
</ if >
< if test= "icon != null" >
icon = #{icon,jdbctype=varchar},
</ if >
< if test= "carmakerpy != null" >
car_maker_py = #{carmakerpy,jdbctype=varchar},
</ if >
< if test= "hottype != null" >
hot_type = #{hottype,jdbctype=bigint},
</ if >
</set>
where id = #{id,jdbctype=bigint}
</update>
|
3.4 复杂类型--map中包含数组的情况
1
2
3
4
5
6
7
8
9
10
11
12
|
<select id= "selectproorderbyorderid" resulttype= "com.epeit.api.model.proorder" parametertype= "java.util.hashmap" >
select sum(pro_order_num) proordernum,product_id productid,promotion_id promotionid
from pro_order
where 1 = 1
< if test= "orderids != null" >
and
<foreach collection= "orderids" item= "item" open= "order_id in(" separator= "," close= ")" >
#{item,jdbctype=bigint}
</foreach>
</ if >
group by product_id,promotion_id
</select>
|
4.注解@param:这个比较特殊,但是很好理解
案例一:
@param(value="startdate") string startdate
:注解单一属性;这个类似于将参数重命名了一次
如调用mybatis的*mapper.xml中配置sql语句(dao层)
1
|
list<string> selectidbysorttime( @param (value= "startdate" )string startdate);
|
则xml中的语句,需要配合@param括号中的内容:参数为startdate
1
2
3
4
|
<select id= "selectidbysorttime" resulttype= "java.lang.string" parametertype= "java.lang.string" >
select distinct ajlcid from ebd_fh_ajlc where sorttime >= to_date(#{startdate,jdbctype=varchar}, 'yyyy-mm-dd' ) and created_date=updated_date
and keyvalue in (select distinct companyname from ebd_fh_company_list where isupdate= '0' )
</select>
|
案例二:
注解javabean,@param(value="datevo") datevo datevo;则需要注意编写的参数
1
|
list<string> selectids( @param (value= "datevo" )datevo datevo);
|
对应的mapping文件
1
2
3
4
|
<select id= "selectids" resulttype= "java.lang.string" parametertype= "com.api.entity.datevo" >
select distinct ajlcid from ebd_fh_ajlc where sorttime >= to_date(# {datevo.startdate,jdbctype=varchar}, 'yyyy-mm-dd' ) and created_date=updated_date
and keyvalue in (select distinct companyname from ebd_fh_company_list where isupdate= '0' )
</select>
|
至于要说优缺点的话,看个人喜好
总结
以上就是这篇文章的全部内容了,希望本文的内容对大家的学习或者工作具有一定的参考学习价值,如果有疑问大家可以留言交流,谢谢大家对服务器之家的支持。
原文链接:https://blog.csdn.net/u010235716/article/details/51698422