Ibatis使用技巧

一、在ibatis中以Map形式返回查询结果

1、在ibatis的配置文件中配置以HashMap返回的resultMap

 <resultMap id="MAX_MIN_ID_RESULT" class="java.util.HashMap">
        <result property="MAXID"/>
        <result property="MINID"/>
    </resultMap>

2、在ibatis的配置文件中,配置以此resultMap为返回值的查询

<select id="SELECT_MAX_MIN_ID_RESULT" resultMap="MAX_MIN_ID_RESULT">
        <![CDATA[SELECT
                 MAX(ID) MAXID,
                 MIN(ID) MINID
                 from dual
                 WHERE C.RNUM <=#maxUpdateCount#
        ]]>
    </select>

 二、在查询时，直接传入Map作为参数

    public void updateLog(CreateVo vo) throws RepositoryException{
        AssertUtils.notNull(vo.getId(), "Id is null");
        Map<String,Object> params = new HashMap<String,Object>();
        params.put("id", vo.getId());
        params.put("modified", vo.getModified());
        params.put("deleted", false);
        this.update(VisitLogEntity.class,params,"EXT");
    }

3、在java代码中调用

getSqlMapClientTemplate().queryForList(statementName,parameterObject);

//aegean
List<Object> result = getInfrastructure().getBaseDaoCaesar()
                .getObjList(TAG_INSTANCE_NAMESPACE, param,
                        SELECT_MAX_MIN_ID_RESULT);