mybatis 参数

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

<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>