主要是find_by_sql后边的代码有问题，总是提示说参数个数错误，怎么整？

Question

quarterIdThe = params[:quarterThe_id].to_s    #得到--本季度操作--对话框       department = params[:department_id]  #得到选择的部门名称   upThe,downThe = getUpTheDownThe(quarterIdThe) #这是我自己写的一个方法，没有错误    busiesses = Business.find_by_sql["SELECT d.name FROM  businesses AS b     JOIN employees AS e ON (b.employee_id = e.id)     JOIN departments AS d ON (e.department_id = d.id)     WHERE d.code = Department AND b.out_date <= UpThe AND b.out_date > DownThe ",{:Department => 'department',:UpThe=> 'upThe',:DownThe=> 'downThe'}] 我用的rails，这是在控制里面写的代码，主要是find_by_sql后边的代码有问题，总是提示说参数个数错误，求各位帮忙解决，或者是在model中写这个方法的话代码应该怎样写

Answer 1

Business.find_by_sql["SELECT d.name FROM  businesses AS b   

    JOIN employees AS e ON (b.employee_id = e.id)   

    JOIN departments AS d ON (e.department_id = d.id)   

    WHERE d.code = ? AND b.out_date <= ? AND b.out_date > ?", department, upThe, downThe]   

Answer 2

{:Department => 'department',:UpThe=> 'upThe',:DownThe=> 'downThe'} 
你怎么这样写。。 
api 
# You can use the same string replacement techniques as you can with ActiveRecord#find 
  Post.find_by_sql ["SELECT title FROM posts WHERE author = ? AND created > ?", author_id, start_date] 
  > [#<Post:0x36bff9c @attributes={"first_name"=>"The Cheap Man Buys Twice"}>, ...]