mybatis中mapper接口的参数设置几种方法

方法一：忽略parameterType，加@param("xxx")注解

在mapper接口中加上@param("xxx")注解，则在配置文件中直接用即可

List<Map<String, Object>> getDataByTime(@Param("startTime") String startTime, @Param("endTime") String endTime, @Param("platformId") Long platformId);

<select id="getDataByTime" resultType="java.util.Map">
      SELECT
        t.seller_id as sellerId,
        sum(t.payment_price) as total,
      FROM
        trade_orders t
      WHERE
        AND
          t.platform_id = #{platformId}
        <if test="startTime != null and startTime != ''">
        AND
            <![CDATA[t.order_time >= #{startTime}]]>
        </if>
        <if test="endTime != null and endTime != ''">
        AND
          <![CDATA[t.order_time <= #{endTime}]]>
        </if>
        GROUP BY
          t.seller_id
    </select>

方法二：忽略parameterType，不加@param("xxx")注解

用#｛index｝，是第几个就用第几个的索引，索引从0开始

List<Map<String, Object>> getDataByTime(String startTime, String endTime, Long platformId);

<select id="getDataByTime" resultType="java.util.Map">
      SELECT
        t.seller_id as sellerId,
        sum(t.payment_price) as total,
      FROM
        trade_orders t
      WHERE
        AND
          t.platform_id = #{3}
        <if test="startTime != null and startTime != ''">
        AND
            <![CDATA[t.order_time >= #{0}]]>
        </if>
        <if test="endTime != null and endTime != ''">
        AND
          <![CDATA[t.order_time <= #{1}]]>
        </if>
        GROUP BY
          t.seller_id
    </select>

方法三：使用Map封装参数，parameterType=“hashmap”

封装好后，直接在配置文件引用#{key}即可

List<Map<String, Object>> getDataByTime(HashMap map);

<select id="getDataByTime" parameterType="hashmap" resultType="java.util.Map">
      SELECT
        t.seller_id as sellerId,
        sum(t.payment_price) as total,
      FROM
        trade_orders t
      WHERE
        AND
          t.platform_id = #{platformId}
        <if test="startTime != null and startTime != ''">
        AND
            <![CDATA[t.order_time >= #{startTime}]]>
        </if>
        <if test="endTime != null and endTime != ''">
        AND
          <![CDATA[t.order_time <= #{endTime}]]>
        </if>
        GROUP BY
          t.seller_id
    </select>

方法四：使用List封装参数

mapper配置文件使用foreach标签循环list

List<Map<String, Object>> getDataByTime(List<String> list);  

<select id="getXXXBeanList" resultType="java.util.Map">
　　select XX from trade_orders where id in
　　<foreach item="item" index="index" collection="list" open="(" separator="," close=")">  
　　　　#{item}  
　　</foreach>  
</select> 

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

<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    

<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

<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

<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）

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

<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

List<String> selectIds(@Param(value="dateVo")DateVo dateVo);

对应的mapping文件

<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