Mybatis映射属性到列

我有一个查询映射器，如下所示：

<select id="searchSomething" parameterType="SomeType" resultType="SomeOtherType">
  select xxxxx
  from T_XXXX
  where 1=1
  <if test="propertyName == 'userName'">
    and USER_NAME = #{propertyValue}
  </if>
  <if test="propertyName == 'address'">
    and ADDRESS = #{propertyValue}
  </if>
  <if test="propertyName == 'taskDate'">
    and TASK_DATE = #{propertyValue}
  </if>
  <if test="propertyName == 'phone1'">
    and PHONE_1 = #{propertyValue}
  </if>
  <if test="propertyName == 'phone2'">
    and PHONE_2 = #{propertyValue}
  </if>
  ...
</select>

<select id="searchSomething" parameterType="SomeType" resultType="SomeOtherType">
  select xxxxx
  from T_XXXX
  where 1=1
    and 
    <propertyToColumn property="propertyName" />
      = #{propertyValue}
</select>

---

一种方法是使用：

准备两个ArrayList，一个带有propertyNames，另一个带有PropertyValue。 确保它们的顺序正确，即propValuesList[i]应该具有propNamesList[i]的值

然后放入HashMap并将其作为输入传递给mapped语句：

Map<String,Object> map = new HashMap<String,Object>();
List<String> propNamesList = new ArrayList<String>();
List<String> propValuesList = new ArrayList<String>();
propNamesList.add(0, "USER_NAME");
propNamesList.add(1, "ADDRESS");

propValuesList.add(0, "admin");
propValuesList.add(1, "hyderabad");

map.put("propNames",propNamesList);
map.put("propValues",propValuesList);

<select id="selectUsers" parameterType="hashmap" resultMap="UserResult">
    select * from users
    where 1 =1
    <if test="propNames != null and propValues != null">
       <foreach item="propName" index="index" collection="propNames">
        and #{propName} = #{propValues[${index}]}
       </foreach>
    </if>
 </select>

然后在映射语句中：

Map<String,Object> map = new HashMap<String,Object>();
List<String> propNamesList = new ArrayList<String>();
List<String> propValuesList = new ArrayList<String>();
propNamesList.add(0, "USER_NAME");
propNamesList.add(1, "ADDRESS");

propValuesList.add(0, "admin");
propValuesList.add(1, "hyderabad");

map.put("propNames",propNamesList);
map.put("propValues",propValuesList);

<select id="selectUsers" parameterType="hashmap" resultMap="UserResult">
    select * from users
    where 1 =1
    <if test="propNames != null and propValues != null">
       <foreach item="propName" index="index" collection="propNames">
        and #{propName} = #{propValues[${index}]}
       </foreach>
    </if>
 </select>

---

观察${index}而不是{index}的用法。

我认为如果在代码中进行参数列转换，并将结果列作为参数传递，效果会更好。在这种情况下，您可以这样做：

<select id="searchSomething" parameterType="SomeType" resultType="SomeOtherType">
  select xxxxx
  from T_XXXX
  where 1=1
    and 
   ${propertyColumn} = #{propertyValue}
</select>

---

当然，您需要将propertyColumn添加到您的VO。

这意味着我必须在java代码中保留属性列映射。但这似乎是唯一的办法。非常感谢。