id 为主键
Map<String, Object> findByTableAndId(@Param("tableName")String tableName,@Param("id")String id);
<select id="findByTableAndId" resultType="java.util.Map" parameterType="java.lang.String">
select * from ${tableName} where id = #{id}
</select>
标红的需要注意 #{} 和${}区别