springmvc + mybatis 遍历Map

spring的application.xml中

数据源:

<!-- enterpriseUser数据库 -->
<bean id="enterpriseUserDataSource" class="org.apache.commons.dbcp2.BasicDataSource">
	<property name="driverClassName" value="${td.jdbc.enterpriseuser.driverClassName}"/>
	<property name="url" value="${td.jdbc.enterpriseuser.url}"/>
	<property name="username" value="${td.jdbc.enterpriseuser.username}"/>
	<property name="password" value="${td.jdbc.enterpriseuser.password}"/>
	<property name="initialSize" value="${td.jdbc.enterpriseuser.initialSize}"/>
	<property name="maxTotal" value="${td.jdbc.enterpriseuser.maxActive}"/>
	<property name="maxIdle" value="${td.jdbc.enterpriseuser.maxIdle}"/>
	<property name="minIdle" value="${td.jdbc.enterpriseuser.minIdle}"/>
	<property name="testOnBorrow" value="${td.jdbc.enterpriseuser.testOnBorrow}"/>
	<property name="validationQuery" value="${td.jdbc.enterpriseuser.validationQuery}"/>
</bean>

sessionFactory:

bean id="enterpriseSqlFactory" class="org.mybatis.spring.SqlSessionFactoryBean">
    <!-- 注入数据库连接池 -->
    <property name="dataSource" ref="enterpriseDataSource" />
    <!-- 配置MyBaties全局配置文件:mybatis-config.xml -->
    <property name="configLocation" value="classpath:mybatis/mybatis-config.xml" />
    <!-- 扫描sql配置文件:mapper需要的xml文件 -->
    <property name="mapperLocations" value="classpath:mybatis/enterprise_mapper/*.xml" />
</bean>

Mapper.xml中的一个查询:

<select id="queryBitmapIsolateParams" resultType="java.util.Map" parameterType="java.util.Map">
    <!-- 具体的sql -->
    ${sql}
    <!-- 具体参数 -->
    <where>
    	<if test="params != null">
    		<foreach collection="params.keys" item="key" separator="and">
				<choose>
					<when test="#{params[#{key}]} == null"> `${key}` IS NULL </when>
					<otherwise> `${key}` = #{params[${key}]} </otherwise>
				</choose>
			</foreach>
		</if>
	</where>
</select>