MyBatis的Mapper配置文件的parameterType用法

在MyBatis的select、insert、update、delete這些元素中都提到了parameterType這個屬性。MyBatis現在可以使用的parameterType有基本數據類型和JAVA復雜數據類型
基本數據類型：包含int,String,Date等。基本數據類型作為傳參，只能傳入一個。通過#{參數名} 即可獲取傳入的值復雜數據類型：包含JAVA實體類、Map。通過#{屬性名}或 #{map的KeyName}即可獲取傳入的值

基本數據類型參數示例：
根據班級ID查詢教師列表
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實體類型參數示例：
[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代碼

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

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

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

Map參數示例：
[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代碼

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());

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

1. MyBatis的傳入參數parameterType類型分兩種

   1. 1. 基本數據類型：int,string,long,Date;

   1. 2. 復雜數據類型：類和Map

   注：不同版本的MyBatis對基本類型傳遞過來的參數名稱不能識別，要使用_parameter來代替。

<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. 如何獲取參數中的值:

   2.1  基本數據類型：#{參數} 獲取參數中的值

   2.2  復雜數據類型：#{屬性名}  ，map中則是#{key}

3.案例：

 

 3.1 基本數據類型案例

<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 復雜類型--map類型     

<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 復雜類型--類類型

<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 復雜類型--map中包含數組的情況

<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： 轉載地址

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