使用IBATIS防止sql注入

           对于ibaits参数引用可以使用#和$两种写法，其中#写法会采用预编译方式，将转义交给了数据库，不会出现注入问题；如果采用$写法，则相当于拼接字符串，会出现注入问题。

例如，如果属性值为“' or '1'='1 ”，采用#写法没有问题，采用$写法就会有问题。

        对于like语句，难免要使用$写法，

        1. 对于Oracle可以通过'%'||'#param#'||'%'避免；

        2. 对于MySQL可以通过CONCAT('%',#param#,'%')避免；

        3. MSSQL中通过'%'+#param#+'% 。 

        4. #与$区别:#xxx# 代表xxx是属性值,map里面的key或者是你的pojo对象里面的属性, ibatis会自动在它的外面加上引号,表现在sql语句是这样的 where xxx = 'xxx' ;

$xxx$ 则是把xxx作为字符串拼接到你的sql语句中, 比如 order by topicId , 语句这样写 ... order by #xxx# ibatis 就会把他翻译成 order by 'topicId' （这样就会报错） 语句这样写 ... order by $xxx$ ibatis 就会把他翻译成 order by topicId

 

 

        为了防止SQL注入，iBatis模糊查询时也要避免使用$$来进行传值。下面是三个不同数据库的ibatis的模糊查询传值。

Sql代码  

mysql: select * from stu where name like concat('%',#name #,'%')

oracle: select * from stu where name like '%'||#name #||'%'

SQL Server:select * from stu where name like '%'+#name #+'%

如：

<!-- 用途：小二后台查询活动的数目 -->
       <select id="countActivitySearch" resultClass="java.lang.Long" parameterClass="actDO">
        <![CDATA[
            select count(id) from activity
            ]]>

        <dynamic prepend="WHERE">
            <isNotNull prepend=" AND " property="name">
                name LIKE CONCAT('%', #name#, '%')
            </isNotNull>
            <isNotNull prepend=" AND "  property="itemId">
                itemId = #itemId#
            </isNotNull>
            <isNotNull prepend=" AND " property="itemName">
                itemName LIKE CONCAT('%', #itemName#, '%')
            </isNotNull>
            <isNotNull prepend=" AND " property="status">
                status = #status#
            </isNotNull>
            <isNotNull prepend=" AND " property="actStatus">
                actStatus = #actStatus#
            </isNotNull>
            <isNotNull prepend=" AND " property="domain">
                domain LIKE CONCAT('%', #domain#, '%')
            </isNotNull>
        </dynamic>

    </select>

    <!-- 用途：小二后台查询活动的列表 -->

    <select id="searchActivityForList" resultMap="actResult" parameterClass="actDO">
        <![CDATA[
            select * from activity
        ]]>

        <dynamic prepend="WHERE">
            <isNotNull prepend=" AND " property="name">
                name LIKE CONCAT('%', #name#, '%')
            </isNotNull>
            <isNotNull prepend=" AND "  property="itemId">
                itemId = #itemId#
            </isNotNull>
            <isNotNull prepend=" AND " property="itemName">
                itemName LIKE CONCAT('%', #itemName#, '%')
            </isNotNull>
            <isNotNull prepend=" AND " property="status">
                status = #status#
            </isNotNull>
            <isNotNull prepend=" AND " property="actStatus">
                actStatus = #actStatus#
            </isNotNull>
            <isNotNull prepend=" AND " property="domain">
                domain LIKE CONCAT('%', #domain#, '%')
            </isNotNull>
        </dynamic>

        <![CDATA[
            order by starttime desc, createtime desc
            limit
                #startRow#, #perPageSize#
        ]]>
    </select>

不要这样来写：

<select id="searchActivityForCount" resultClass="java.lang.Long" >
        <![CDATA[
            select count(*) from activity
            ]]>

        <dynamic prepend="WHERE">
            <isNotNull prepend=" AND " property="name">
                name LIKE '%$name$%'
            </isNotNull>
            <isNotNull prepend=" AND " property="itemId">
                itemId LIKE '%$itemId$%'
            </isNotNull>
            <isNotNull prepend=" AND " property="itemName">
                itemName LIKE '%$itemName$%'
            </isNotNull>
            <isNotNull prepend=" AND " property="status">
                status = #status#
            </isNotNull>
            <isNotNull prepend=" AND " property="actStatus">
                actStatus = #actStatus#
            </isNotNull>
            <isNotNull prepend=" AND " property="domain">
                domain LIKE '%$domain$%'
            </isNotNull>
        </dynamic>
    </select>

    <select id="searchActivityForList" resultMap="actResult" parameterClass="actDO">
        <![CDATA[
            select * from activity
        ]]>

        <dynamic prepend="WHERE">
            <isNotNull prepend=" AND " property="name">
                name LIKE '%$name$%'
            </isNotNull>
            <isNotNull prepend=" AND " property="itemId">
                itemId LIKE '%$itemId$%'
            </isNotNull>
            <isNotNull prepend=" AND " property="itemName">
                itemName LIKE '%$itemName$%'
            </isNotNull>
            <isNotNull prepend=" AND " property="status">
                status = #status#
            </isNotNull>
            <isNotNull prepend=" AND " property="actStatus">
                actStatus = #actStatus#
            </isNotNull>
            <isNotNull prepend=" AND " property="domain">
                domain LIKE '%$domain$%'
            </isNotNull>
        </dynamic>

        <![CDATA[
            order by starttime desc, createtime desc
            limit
                #startRow#, #perPageSize#
        ]]>
    </select>