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. 1. 基本数据类型:int,string,long,Date;
1. 2. 复杂数据类型:类和Map
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}
3.1 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>
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
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