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

<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

<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

 <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

<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.註解@Param：這個比較特殊，但是很好理解

案例一：

@Param(value="startdate") String startDate ：註解單一屬性；這個類似於將參數重命名了一次

如調用mybatis的*mapper.xml中配置sql語句（DAO層）

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

 <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：
註解javaBean,@Param(value="dateVo") DateVo dateVo；則需要註意編寫的參數

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

對應的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>

原文：https://blog.csdn.net/u010235716/article/details/51698422

MyBatis的傳入參數parameterType類型