BlogJava-ZHOULEI's Java Blog-随笔分类-iBatishttp://www.blogjava.net/ZhouLei/category/34343.htmlJava EE 5, Webwork, Spring, iBatis, AJAXzh-cnWed, 03 Sep 2008 15:35:28 GMTWed, 03 Sep 2008 15:35:28 GMT60关于 iBATIS 的几点补充http://www.blogjava.net/ZhouLei/archive/2008/09/03/226795.htmlzhouleizhouleiWed, 03 Sep 2008 14:24:00 GMThttp://www.blogjava.net/ZhouLei/archive/2008/09/03/226795.htmlhttp://www.blogjava.net/ZhouLei/comments/226795.htmlhttp://www.blogjava.net/ZhouLei/archive/2008/09/03/226795.html#Feedback0http://www.blogjava.net/ZhouLei/comments/commentRss/226795.htmlhttp://www.blogjava.net/ZhouLei/services/trackbacks/226795.html 14.6. 在iBATIS 2.09以后SQLMap支持动态表名
 Sample :
 <select id ="getRighe"
         remapResults ="true"
         resultMap ="resultRighe"
         parameterClass ="java.util.Map" >
              select * from
                       $tablePrefix$_righe
              where IDUser = #IDUser#
 </ select >
 
java code :
param.put("tablePrefix", "NAG");
param.put("IDUser", IDUser);
utente = (Riga)getSqlMapClientTemplate().queryForObject("getRighe", param);
 
 
14.7. Parameter Map 和 Inline Parameter
具有 parameterMap 的statement中用?表示变量的占位符;而 Inline Parameter则用#varName#. 当使用基本类型包装类代替Java Bean时，切记要使用#value#作为参数。
      <parameterMap id=”insert-product-param” class=”com.domain.Product”>
             <parameter property=”id”
                  jdbcType=”NUMERIC”
               javaType=”int”
               nullValue=”-9999999”/>
             <parameter property=”description”
               jdbcType=”VARCHAR”
               nullValue=”NO_ENTRY”/>
</parameterMap>
<statement id=”insertProduct”
             parameterMap=”insert-product-param”>
             insert into PRODUCT (PRD_ID, PRD_DESCRIPTION) values (?,?);
</statement>
 
<statement id=”insertProduct”
       parameterClass=”com.domain.Product”>
       insert into PRODUCT (PRD_ID, PRD_DESCRIPTION)
       values (#id:NUMERIC:-999999#, #description:VARCHAR:NO_ENTRY#);
</statement>
 
14.8. 复杂类型属性
    <resultMap id=”get-product-result”
               class=”com.ibatis.example.Product”>
               <result property=”id” column=”PRD_ID”/>
               <result property=”description” column=”PRD_DESCRIPTION”/>
               <result property=”category”
                              column=”PRD_CAT_ID”
                              select=”getCategory”/>
</resultMap>
<resultMap id=”get-category-result”
                  class=”com.ibatis.example.Category”>
                  <result property=”id” column=”CAT_ID”/>
                  <result property=”description” column=”CAT_DESCRIPTION”/>
</resultMap>
<statement id=”getProduct”
                  parameterClass=”int”
                  resultMap=”get-product-result”>
                  select * from PRODUCT where PRD_ID = #value#
</statement>
<statement id=”getCategory”
                  parameterClass=”int”
                  resultMap=”get-category-result”>
                  select * from CATEGORY where CAT_ID = #value#
</statement>
上面的例子中，Product对象拥有一个类型为Category的category属性。因为category是复杂类型（用户定义的类型），JDBC不知道如何给它赋值。通过将category属性值和另一个mapped statement联系起来，为SQL Map引擎如何给它赋值提供了足够的信息。通过执行“getProduct”，“get-product-result”Result Map使用PRD_CAT_ID字段的值去调用“getCategory”。“get-category-result”Result Map将初始化一个Category对象并赋值给它。然后整个Category对象将赋值给Product的category属性。
使用一个联合查询和嵌套的属性映射来代替两个查询statement。上面例子的解决方案是：
<resultMap id=”get-product-result” class=”com.ibatis.example.Product”>
      <result property=”id” column=”PRD_ID”/>
      <result property=”description” column=”PRD_DESCRIPTION”/>
      <result property=”category.id” column=”CAT_ID” />
      <result property=”category.description” column=”CAT_DESCRIPTION” />
</resultMap>
<statement id=”getProduct” parameterClass=”int” resultMap=”get-product-result”>
      select *
      from PRODUCT, CATEGORY
      where PRD_CAT_ID=CAT_ID
      and PRD_ID = #value#
</statement>
 
14.9. 配置Log4J
 # Global logging configuration
log4j.rootLogger=ERROR, stdout
 
# SqlMap logging configuration...
log4j.logger.com.ibatis=DEBUG
log4j.logger.com.ibatis.common.jdbc.SimpleDataSource=DEBUG
log4j.logger.com.ibatis.common.jdbc.ScriptRunner=DEBUG
log4j.logger.com.ibatis.sqlmap.engine.impl.SqlMapClientDelegate=DEBUG
log4j.logger.java.sql.Connection=DEBUG
#log4j.logger.java.sql.Statement=DEBUG
#log4j.logger.java.sql.PreparedStatement=DEBUG
#log4j.logger.java.sql.ResultSet=DEBUG
 
# Console output...
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%5p [%t] - %m%n
 
14.10. 动态SQL语句
   <statement id="someName" resultMap="account-result" >
            select * from ACCOUNT
            <dynamic prepend="where">
                        <isGreaterThan prepend="and" property="id" compareValue="0">
                          ACC_ID = #id#
                        </isGreaterThan>
                        <isNotNull prepend=”and" property="lastName">
                          ACC_LAST_NAME = #lastName#
                        </isNotNull>
            </dynamic>
              order by ACC_LAST_NAME
</statement>
对于以上蓝色的单词就是 动态Mapped Statement 元素关系运算符(她包括一元和二元的很多类型,具体参见 注14.1. 点的内容)



zhoulei 2008-09-03 22:24 发表评论
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