MyBatis的传入参数parameterType类型

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>

　　

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