MyBatis的Mapper配置文件的parameterType用法

在MyBatis的select、insert、update、delete这些元素中都提到了parameterType这个属性。MyBatis现在可以使用的parameterType有基本数据类型和JAVA复杂数据类型
基本数据类型：包含int,String,Date等。基本数据类型作为传参，只能传入一个。通过#{参数名} 即可获取传入的值复杂数据类型：包含JAVA实体类、Map。通过#{属性名}或 #{map的KeyName}即可获取传入的值

基本数据类型参数示例：
根据班级ID查询教师列表
xml文件
[html] view plaincopy

<select id="selectTeacher" parameterType="int" resultType="com.myapp.domain.Teacher"> select * from Teacher where c_id=#{id}

</select>[java] view plaincopy

List<Teacher> tList = teacherMapper.selectTeacher(2); for (Teacher entityTemp : tList) {

System.out.println(entityTemp.toString()); }

JAVA实体类型参数示例：
[html] view plaincopy

<select id="selectTeacher" parameterType="com.myapp.domain.Teacher" resultType="com.myapp.domain.Teacher"> select * from Teacher where c_id=#{id}

</select> [java] view plaincopy

java代码

Teacher queryTeacher=new Teacher(); queryTeacher.setId(2);

List<Teacher> tList = teacherMapper.selectTeacher(queryTeacher); for (Teacher entityTemp : tList) {

System.out.println(entityTemp.toString()); }

Map参数示例：
[html] view plaincopy

<select id="selectTeacher" parameterType="Map" resultType="com.myapp.domain.Teacher"> select * from Teacher where c_id=#{id} and sex=#{sex}

</select>
[java] view plaincopy

java代码

Map<String,String> map=new HasMap<String,String>(); map.put("id","2");

map.put("sex","男"); List<Teacher> tList = teacherMapper.selectTeacher(map);

for (Teacher entityTemp : tList) { System.out.println(entityTemp.toString()); }[java] view plaincopy

public List<Teacher> selectTeacher(@Param(value="id") String id,@Param(value="sex") String sex);[html] view plaincopy

<select id="selectTeacher" resultType="com.myapp.domain.Teacher"> select * from Teacher where c_id=#{id} and sex=#{sex}

</select>[java] view plaincopy

List<Teacher> tList = teacherMapper.selectTeacher("2","男"); for (Teacher entityTemp : tList) {

System.out.println(entityTemp.toString());

来源： https://www.2cto.com/database/201501/370159.html

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

   注：不同版本的MyBatis对基本类型传递过来的参数名称不能识别，要使用_parameter来代替。

<select id="getWinLogByEventId" parameterType="java.lang.Long" resultMap="BaseResultMap">
    select <include refid="Base_Column_List"/> from win_log where eventId = #{_parameter,jdbcType=BIGINT}
</select>

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>

注：转载地址

来源： http://blog.csdn.net/kingjin_csdn_/article/details/53156732