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
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<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
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<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
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<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
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<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)
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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
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<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
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list<string> selectids( @param (value= "datevo" )datevo datevo); |
对应的mapping文件
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<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
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原文链接:https://blog.csdn.net/u010235716/article/details/51698422