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ibatis select 标签


select的输入和输出

例如 select id,name,age from user where name like '%王%' and age>20

这里既有输入也有输出

select的属性
id,parameterClass,resultClass,parameterMap,resultMap,cacheModel
resultSetType,fetchSize,xmlResultName,remapResults,timeout
输入 parameterClass,ParameterMap
resultSetTYpe为结果集类型,主要是说游标,具有方向性,可以取
forward_only,scoll_insensitive,scoll_sensitive,具体情况具体配置

fetchSize 预取回数据量的大小

xmlResultName,返回result为xml的名称

如果返回的结果可以修改则吧remapResults设为true,否则设为false

输入,用参数带进来
可以是#,$做为占位符

不同占位符使用


Xml代码

ibatis select 标签_iBATIS


1. <SPAN style="FONT-SIZE: small"><select id="getAllUsers1" resultClass="com.mypackage.User"
2. parameterClass="string">
3. DEPARTMENT=#department#    
4.   </select>   
5.  <select id="getAllUsers1" resultClass="com.mypackage.User"
6. parameterClass="string">
7.   SELECT * FROM USER WHERE DEPARTMENT like '$department$'   
8.   </select>   
9.  </SPAN>

<select id="getAllUsers1" resultClass="com.mypackage.User"
  parameterClass="string">
  SELECT * FROM USER WHERE DEPARTMENT=#department#
 </select>
<select id="getAllUsers1" resultClass="com.mypackage.User"
  parameterClass="string">
  SELECT * FROM USER WHERE DEPARTMENT like '$department$'
 </select>

 

#不能放在‘’之内

resultMap

 


Xml代码

ibatis select 标签_iBATIS



    1. <SPAN style="FONT-SIZE: small"><!-- 无映射  -->
    2.   <select id="getAllUsers1" resultClass="User"
    3. parameterClass="string">
    4. DEPARTMENT=#department#    
    5.   </select>   
    6.   
    7. <!-- 内联映射->实体类 -->
    8.   <select id="getAllUsers2" resultClass="User"
    9. parameterClass="string">
    10.   SELECT USERID as userid, USERNAME as username, PASSWORD as   
    11.   password, DEPARTMENT as department FROM USER WHERE   
    12. DEPARTMENT=#department#    
    13.   </select>   
    14.   
    15. <!-- 内联映射->MAP类 -->
    16.   <select id="getAllUsers3" resultClass="hashmap"
    17. parameterClass="string">
    18. DEPARTMENT=#department#    
    19.   </select>   
    20.   
    21. <!-- 显示映射->实体类 -->
    22.   <resultMap id="accoutResult" class="User">
    23.    <result property="userid" column="USERID" />
    24.    <result property="username" column="USERNAME" />
    25.    <result property="password" column="PASSWORD" />
    26.    <result property="department" column="DEPARTMENT" />
    27.   </resultMap>   
    28.   <select id="getAllUsers4" resultMap="accoutResult"
    29. parameterClass="string">
    30. DEPARTMENT=#department#    
    31.   </select>   
    32.   
    33. <!-- 显示映射->MAP类 -->
    34.   <resultMap id="mapResult" class="hashmap">
    35.    <result property="userid" column="USERID" />
    36.    <result property="username" column="USERNAME" />
    37.    <result property="password" column="PASSWORD" />
    38.    <result property="department" column="DEPARTMENT" />
    39.   </resultMap>   
    40.   <select id="getAllUsers5" resultMap="mapResult"
    41. parameterClass="string">
    42. DEPARTMENT=#department#    
    43.   </select>   
    44.   
    45.  </SPAN>


    <!-- 无映射  -->
     <select id="getAllUsers1" resultClass="User"
      parameterClass="string">
      SELECT * FROM USER WHERE DEPARTMENT=#department#
     </select>
    
     <!-- 内联映射->实体类 -->
     <select id="getAllUsers2" resultClass="User"
      parameterClass="string">
      SELECT USERID as userid, USERNAME as username, PASSWORD as
      password, DEPARTMENT as department FROM USER WHERE
      DEPARTMENT=#department#
     </select>
    
     <!-- 内联映射->MAP类 -->
     <select id="getAllUsers3" resultClass="hashmap"
      parameterClass="string">
      SELECT * FROM USER WHERE DEPARTMENT=#department#
     </select>
    
     <!-- 显示映射->实体类 -->
     <resultMap id="accoutResult" class="User">
      <result property="userid" column="USERID" />
      <result property="username" column="USERNAME" />
      <result property="password" column="PASSWORD" />
      <result property="department" column="DEPARTMENT" />
     </resultMap>
     <select id="getAllUsers4" resultMap="accoutResult"
      parameterClass="string">
      SELECT * FROM USER WHERE DEPARTMENT=#department#
     </select>
    
     <!-- 显示映射->MAP类 -->
     <resultMap id="mapResult" class="hashmap">
      <result property="userid" column="USERID" />
      <result property="username" column="USERNAME" />
      <result property="password" column="PASSWORD" />
      <result property="department" column="DEPARTMENT" />
     </resultMap>
     <select id="getAllUsers5" resultMap="mapResult"
      parameterClass="string">
      SELECT * FROM USER WHERE DEPARTMENT=#department#
     </select>

     

     map映射 ,返回的list里的每一项都是一个map然后有键值对

    xml映射


    Xml代码

    ibatis select 标签_iBATIS



      1. <SPAN style="FONT-SIZE: small"><!-- XML -->
      2.   <select id="selectXML" parameterClass="string" resultClass="xml"
      3. xmlResultName="log">
      4. GROUPNAME=#groupName#    
      5.   </select>   
      6.  </SPAN>


      <!-- XML -->
       <select id="selectXML" parameterClass="string" resultClass="xml"
        xmlResultName="log">
        SELECT * FROM USER_ACCOUNT WHERE GROUPNAME=#groupName#
       </select>

        

      resultClass="xml"这个xml也是预定义好的类

      在测试类里调用后返回的是xml格式的字符串,指定的xmlResultName相当于xml的
      根元素

       

      返回结果有三类,1 返回直接指定的类 2 返回map类型 3 返回xml

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