MyBatis传入参数可以有哪些类型(parameterType)呢?

MyBatis传入参数parameterType类型分两种:
   基本数据类型:int,string,long,Date;

   复杂数据类型:类和Map

mybatis获取参数中的值

 
  基本数据类型：#{参数} 获取参数中的值

  复杂数据类型：#{属性名}  ，map中则是#{key}

 
 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 car_info
        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 car_info 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 car_info
        <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>

注解@Param

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 test where sorttime >= to_date(#{startdate,jdbcType=VARCHAR},'YYYY-MM-DD') and created_date=updated_date 
      	and keyvalue in (select  distinct companyname from compInfo 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 sort from test where sorttime >= to_date(#       {dateVo.startDate,jdbcType=VARCHAR},'YYYY-MM-DD') and created_date=updated_date 
      	and keyvalue in (select  distinct companyname from compInfo where isupdate='0')
     </select>