前言
mybatis的mapper文件中的select、insert、update、delete元素中有一個parametertype屬性,用于對應的mapper接口方法接受的參數類型。本文主要給大家介紹了關于mybatis傳入參數parametertype類型的相關內容,分享出來供大家參考學習,下面話不多說了,來一起看看詳細的介紹吧。
1. mybatis的傳入參數parametertype類型分兩種
1. 1. 基本數據類型:int,string,long,date;
1. 2. 復雜數據類型:類和map
2. 如何獲取參數中的值:
2.1 基本數據類型:#{參數} 獲取參數中的值
2.2 復雜數據類型:#{屬性名} ,map中則是#{key}
3.案例:
3.1 基本數據類型案例
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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 復雜類型--map類型
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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 復雜類型--類類型
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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 復雜類型--map中包含數組的情況
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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:這個比較特殊,但是很好理解
案例一:
@param(value="startdate") string startdate
:注解單一屬性;這個類似于將參數重命名了一次
如調用mybatis的*mapper.xml中配置sql語句(dao層)
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list<string> selectidbysorttime( @param (value= "startdate" )string startdate); |
則xml中的語句,需要配合@param括號中的內容:參數為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;則需要注意編寫的參數
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list<string> selectids( @param (value= "datevo" )datevo datevo); |
對應的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> |
至于要說優缺點的話,看個人喜好
總結
以上就是這篇文章的全部內容了,希望本文的內容對大家的學習或者工作具有一定的參考學習價值,如果有疑問大家可以留言交流,謝謝大家對服務器之家的支持。
原文鏈接:https://blog.csdn.net/u010235716/article/details/51698422