sql - 如何对名字、姓氏进行 SQL 搜索查询

Question

例如，如果我有一个模型:

User :firstname   :lastname
     joseph       smith
     anna         bauer
     ...          ...

还有一个输入字段，您可以在其中搜索用户。不同的搜索查询可能是:

  searchquery1:  smith joseph
  searchquery2:  joseph smith
  searchquery3:  joseph
  searchquery4:  smith

SQL 中的哪个搜索查询最好？其实我可以想象这个搜索查询:

  where 'firstname OR lastname  LIKE ?', "%#{search}"

第一次尝试:

def self.search(search)
 if search
   select('CONCAT(vorname, " ", nachname) as full_name, *')
   where ['vorname LIKE :s OR nachname  LIKE :s OR full_name LIKE :s', :s => "%#{search}"]
 else
  scoped
 end
end

错误: SQLite3::SQLException: no such column: full_name第二次尝试:

def self.search(search)
 if search
  a = search.split
   where('firstname OR lastname  LIKE ?', a[1])
   where('firstname OR lastname  LIKE ?', a[2]) unless a[2].nil?
  else
  scoped
 end
end

问题:一无所获!

Answer 1

是的，您必须像这样搜索名字和姓氏

select('(firstname || " " || lastname) as \'full_name\', *')
where ['firstname LIKE :s OR lastname  LIKE :s OR full_name LIKE :s', :s => "%#{search}"]

但是如果数据太大。您可以使用 Solr 或 thinkin sphinx 等全文搜索引擎