查詢唯一整數Rails 2.3

我的環境是Ruby 1.8.7-p358 with Rails 2.3.11。我試圖查詢所有accounts，其中first_name只包含數字（它們都是3位整數，即001,143,815等）。我一直在嘗試使用此查詢：查詢唯一整數Rails 2.3

Account.find(:all, :conditions => ["first_name LIKE ?", "[^0-9][^0-9][^0-9]"])

我所得到的回報是=> []。

如果我僅使用與NOT LIKE相同的查詢，我會得到所有accounts，其中first_name是一個整數。

我也嘗試使用：

Account.find(:all, :conditions => ["first_name REGEXP ?", "[^0-9][^0-9][^0-9]"])

，但只給了我：

ActiveRecord::StatementInvalid: PGError: ERROR: syntax error at or near "REGEXP" 
LINE 1: SELECT * FROM "accounts" WHERE (first_name REGEXP '[0-9][0-9... 
              ^

: SELECT * FROM "accounts" WHERE (first_name REGEXP '[0-9][0-9][0-9]') ORDER BY first_name ASC 
    from /Users/kyle/.rvm/gems/[email protected]_recruiter_portal/gems/activerecord-2.3.11/lib/active_record/connection_adapters/abstract_adapter.rb:227:in `log' 
    from /Users/kyle/.rvm/gems/[email protected]_recruiter_portal/gems/activerecord-2.3.11/lib/active_record/connection_adapters/postgresql_adapter.rb:520:in `execute' 
    from /Users/kyle/.rvm/gems/[email protected]_recruiter_portal/gems/activerecord-2.3.11/lib/active_record/connection_adapters/postgresql_adapter.rb:1002:in `select_raw' 
    from /Users/kyle/.rvm/gems/[email protected]_recruiter_portal/gems/activerecord-2.3.11/lib/active_record/connection_adapters/postgresql_adapter.rb:989:in `select' 
    from /Users/kyle/.rvm/gems/[email protected]_recruiter_portal/gems/activerecord-2.3.11/lib/active_record/connection_adapters/abstract/database_statements.rb:7:in `select_all_without_query_cache' 
     from /Users/kyle/.rvm/gems/[email protected]_recruiter_portal/gems/activerecord-2.3.11/lib/active_record/connection_adapters/abstract/query_cache.rb:62:in `select_all' 
    from /Users/kyle/.rvm/gems/[email protected]_recruiter_portal/gems/activerecord-2.3.11/lib/active_record/base.rb:665:in `find_by_sql' 
    from /Users/kyle/.rvm/gems/[email protected]_recruiter_portal/gems/activerecord-2.3.11/lib/active_record/base.rb:1582:in `find_every' 
    from /Users/kyle/.rvm/gems/[email protected]_recruiter_portal/gems/activerecord-2.3.11/lib/active_record/base.rb:619:in `find' 
    from (irb):189 
    from :0

是正則表達式不允許？我怎樣才能找到每個account與first_name等於一個三位數的整數？

來源

2012-10-18 starscream_disco_party

like運算符不計算正則表達式。在相反，您可以同時使用similar to：

select '980' similar to '[0-9][0-9][0-9]'; 
?column? 
---------- 
t

或者~：

select '980' ~ '[0-9][0-9][0-9]'; 
?column? 
---------- 
t 
(1 row)

來源

2012-10-18 17:43:14

Arrghh！仍然清空！ '>> a = Account.find（：all，：conditions => [「first_name〜？」，「[0-9] [0-9] [0-9]」]） => [] >> a = Account.find（：all，：conditions => [「first_name SIMILAR TO？」，「[0-9] [0-9] [0-9]」]） => []' –

@JustLikeThat There是你的「[0-9] [0-9] [0-9]」 –

的領先空間。你是對的！運營商「SIMILAR TO」運作良好！謝謝！ –

查詢唯一整數Rails 2.3

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