iBatis把一个表的sqlmap配置的多个xml中。

其实我们只需要在iBatis配置中添加多一个xml就可以。但值得注意的是，必须把代码生成器生成的基础xml配置在特殊的xml配置之前，否则，特殊的xml使用基础xml中的resultMap时会报错。因为iBatis在初始化的时候，是根据<sqlMaps>的顺序逐个初始化的。

下面举个例子。虽然不是特殊的xml，但我还是把一个表的sql分开到2个xml中去进行配置：

下面是iBatis的<sqlMaps>的配置代码：

  <sqlMaps>
    <sqlMap resource="Maps/Person_Auto.xml"/>
    <sqlMap resource="Maps/Person.xml"/>
  </sqlMaps>

基础xml配置(Person_Auto.xml)：

<?xml version="1.0" encoding="utf-8" ?>

<sqlMap namespace="Person" xmlns="http://ibatis.apache.org/mapping" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" >
  <alias>
    <typeAlias alias="Person" type="piggyWinFormTemplet.Model.Person, piggyWinForm" />
  </alias>

  <resultMaps>
    <resultMap id="SelectResult" class="Person">
      <result property="Id" column="PER_ID" />
      <result property="FirstName" column="PER_FIRST_NAME" />
      <result property="LastName" column="PER_LAST_NAME" />
      <result property="BirthDate" column="PER_BIRTH_DATE" />
      <result property="WeightInKilograms" column="PER_WEIGHT_KG" />
      <result property="HeightInMeters" column="PER_HEIGHT_M" />
    </resultMap>
  </resultMaps>

  <statements>

    <select id="SelectByPrimaryKey" parameterClass="int" resultMap="SelectResult">
      select
      PER_ID,
      PER_FIRST_NAME,
      PER_LAST_NAME,
      PER_BIRTH_DATE,
      PER_WEIGHT_KG,
      PER_HEIGHT_M
      from PERSON
      <dynamic prepend="WHERE">
        <isParameterPresent>
          PER_ID = #value#
        </isParameterPresent>
      </dynamic>
    </select>

    <insert id="Insert" parameterClass="Person" resultClass="int">
      insert into Person (
      PER_ID,
      PER_FIRST_NAME,
      PER_LAST_NAME,
      PER_BIRTH_DATE,
      PER_WEIGHT_KG,
      PER_HEIGHT_M
      ) values (
      #Id:int#,
      #FirstName:varchar#,
      #LastName:varchar#,
      #BirthDate:smalldatetime#,
      #WeightInKilograms:decimal#,
      #HeightInMeters:decimal#
      )
    </insert>

    <update id="Update" parameterClass="Person" resultClass="int">
      update Person set
      <isNotNull property="FirstName" >PER_FIRST_NAME=#FirstName:varchar#</isNotNull>
      <isNotNull property="LastName" prepend=",">PER_LAST_NAME=#LastName:varchar#</isNotNull>
      <isNotNull property="BirthDate" prepend=",">PER_BIRTH_DATE=#BirthDate:smalldatetime#</isNotNull>
      <isNotNull property="WeightInKilograms" prepend=",">PER_WEIGHT_KG=#WeightInKilograms:decimal#</isNotNull>
      <isNotNull property="HeightInMeters" prepend=",">PER_HEIGHT_M=#HeightInMeters:decimal#</isNotNull>
      where PER_ID=#Id:int#
    </update>
   

    <delete id="Delete" parameterClass="int" resultClass="int">
      delete from PERSON
      where PER_ID = #value#
    </delete>

  </statements>

</sqlMap>

特殊xml配置(Person.xml)：

<?xml version="1.0" encoding="utf-8" ?>

<sqlMap namespace="Person" xmlns="http://ibatis.apache.org/mapping" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" >

  <statements>
    <select id="SelectAll" resultMap="SelectResult">
      select
      PER_ID,
      PER_FIRST_NAME,
      PER_LAST_NAME,
      PER_BIRTH_DATE,
      PER_WEIGHT_KG,
      PER_HEIGHT_M
      from PERSON
    </select>

  </statements>
</sqlMap>

总结：类似的这种情况不只是出现在这种地方，我们，类似的还有我们的model类。我们加个字段，我们就得用代码生成器对其重新生成。我们最好还得派生出一个子类来继承该自动生成的类，把我们项目中的特殊性代码写在该派生类里，这样，我们用代码生成器生成后可以直接进行替换，不用担心把特殊性代码给覆盖掉。