45

一度に 1 つずつではなく、複数のレコードを挿入する方法はありますか?

私は次のことをしている非常に醜いレーキタスクを持っています...

        VoteRecord.create(:prospect_id => prospect.id, :state => "OH", :election_type => "PR", :election => "2000-03-07", :party => row[45], :participate => participated(row[45]))
        VoteRecord.create(:prospect_id => prospect.id, :state => "OH", :election_type => "GE", :election => "2000-11-07", :party => row[46], :participate => participated(row[46])) 
        VoteRecord.create(:prospect_id => prospect.id, :state => "OH", :election_type => "SP", :election => "2000-05-08", :party => row[47], :participate => participated(row[47]))
        VoteRecord.create(:prospect_id => prospect.id, :state => "OH", :election_type => "GE", :election => "2001-11-06", :party => row[48], :participate => participated(row[48]))
        VoteRecord.create(:prospect_id => prospect.id, :state => "OH", :election_type => "PR", :election => "2002-05-07", :party => row[49], :participate => participated(row[49]))
        VoteRecord.create(:prospect_id => prospect.id, :state => "OH", :election_type => "GE", :election => "2002-11-05", :party => row[50], :participate => participated(row[50]))
        VoteRecord.create(:prospect_id => prospect.id, :state => "OH", :election_type => "SP", :election => "2003-05-06", :party => row[51], :participate => participated(row[51]))
        VoteRecord.create(:prospect_id => prospect.id, :state => "OH", :election_type => "GE", :election => "2003-11-04", :party => row[52], :participate => participated(row[52]))
        VoteRecord.create(:prospect_id => prospect.id, :state => "OH", :election_type => "PR", :election => "2004-03-02", :party => row[53], :participate => participated(row[53]))
        VoteRecord.create(:prospect_id => prospect.id, :state => "OH", :election_type => "GE", :election => "2004-11-02", :party => row[54], :participate => participated(row[54]))
        VoteRecord.create(:prospect_id => prospect.id, :state => "OH", :election_type => "SP", :election => "2005-02-08", :party => row[55], :participate => participated(row[55]))
        VoteRecord.create(:prospect_id => prospect.id, :state => "OH", :election_type => "PR", :election => "2005-05-03", :party => row[56], :participate => participated(row[56]))
        VoteRecord.create(:prospect_id => prospect.id, :state => "OH", :election_type => "PR", :election => "2005-09-13", :party => row[57], :participate => participated(row[56]))
        VoteRecord.create(:prospect_id => prospect.id, :state => "OH", :election_type => "GE", :election => "2005-11-08", :party => row[58], :participate => participated(row[58]))
        VoteRecord.create(:prospect_id => prospect.id, :state => "OH", :election_type => "SP", :election => "2006-02-07", :party => row[59], :participate => participated(row[59]))
        VoteRecord.create(:prospect_id => prospect.id, :state => "OH", :election_type => "PR", :election => "2006-05-02", :party => row[60], :participate => participated(row[60]))
        VoteRecord.create(:prospect_id => prospect.id, :state => "OH", :election_type => "GE", :election => "2006-11-07", :party => row[61], :participate => participated(row[61]))
        VoteRecord.create(:prospect_id => prospect.id, :state => "OH", :election_type => "PR", :election => "2007-05-08", :party => row[62], :participate => participated(row[62]))
        VoteRecord.create(:prospect_id => prospect.id, :state => "OH", :election_type => "PR", :election => "2007-09-11", :party => row[63], :participate => participated(row[63]))
        VoteRecord.create(:prospect_id => prospect.id, :state => "OH", :election_type => "GE", :election => "2007-11-06", :party => row[64], :participate => participated(row[64]))
        VoteRecord.create(:prospect_id => prospect.id, :state => "OH", :election_type => "PR", :election => "2007-11-06", :party => row[65], :participate => participated(row[65]))
        VoteRecord.create(:prospect_id => prospect.id, :state => "OH", :election_type => "PR", :election => "2007-12-11", :party => row[66], :participate => participated(row[66]))
        VoteRecord.create(:prospect_id => prospect.id, :state => "OH", :election_type => "PR", :election => "2008-03-04", :party => row[67], :participate => participated(row[67]))
        VoteRecord.create(:prospect_id => prospect.id, :state => "OH", :election_type => "PR", :election => "2008-10-14", :party => row[68], :participate => participated(row[68]))
        VoteRecord.create(:prospect_id => prospect.id, :state => "OH", :election_type => "GE", :election => "2008-11-04", :party => row[69], :participate => participated(row[69]))
        VoteRecord.create(:prospect_id => prospect.id, :state => "OH", :election_type => "GE", :election => "2008-11-18", :party => row[70], :participate => participated(row[70]))
        VoteRecord.create(:prospect_id => prospect.id, :state => "OH", :election_type => "PR", :election => "2009-05-05", :party => row[71], :participate => participated(row[71]))
        VoteRecord.create(:prospect_id => prospect.id, :state => "OH", :election_type => "PR", :election => "2009-09-08", :party => row[72], :participate => participated(row[72]))
        VoteRecord.create(:prospect_id => prospect.id, :state => "OH", :election_type => "PR", :election => "2009-09-15", :party => row[73], :participate => participated(row[73]))
        VoteRecord.create(:prospect_id => prospect.id, :state => "OH", :election_type => "PR", :election => "2009-09-29", :party => row[74], :participate => participated(row[74]))
        VoteRecord.create(:prospect_id => prospect.id, :state => "OH", :election_type => "GE", :election => "2009-11-03", :party => row[75], :participate => participated(row[75]))
        VoteRecord.create(:prospect_id => prospect.id, :state => "OH", :election_type => "PR", :election => "2010-05-04", :party => row[76], :participate => participated(row[76]))
        VoteRecord.create(:prospect_id => prospect.id, :state => "OH", :election_type => "PR", :election => "2010-07-13", :party => row[77], :participate => participated(row[77]))
        VoteRecord.create(:prospect_id => prospect.id, :state => "OH", :election_type => "PR", :election => "2010-09-07", :party => row[78], :participate => participated(row[78]))
        VoteRecord.create(:prospect_id => prospect.id, :state => "OH", :election_type => "GE", :election => "2010-11-02", :party => row[79], :participate => participated(row[79]))
        VoteRecord.create(:prospect_id => prospect.id, :state => "OH", :election_type => "PR", :election => "2011-05-03", :party => row[80], :participate => participated(row[80]))
        VoteRecord.create(:prospect_id => prospect.id, :state => "OH", :election_type => "PR", :election => "2011-09-13", :party => row[81], :participate => participated(row[81]))
        VoteRecord.create(:prospect_id => prospect.id, :state => "OH", :election_type => "GE", :election => "2011-11-08", :party => row[82], :participate => participated(row[82]))

これは非常に非効率的である必要があり、より良い方法が必要です...

4

4 に答える 4

67

このcreateメソッドは、パラメーターとして配列も受け取ります。

VoteRecord.create(
  [
    { :prospect_id => prospect.id, :state => "OH", :election_type => "GE", :election => "2011-11-08", :party => row[82], :participate => participated(row[82]) },
    { :prospect_id => prospect.id, :state => "OH", :election_type => "PR", :election => "2011-09-13", :party => row[81], :participate => participated(row[81]) }
    ...
  ]
)

ただし、これは単一の SQL クエリではなく、エントリごとに 1 つの SQL クエリを実行します。内部で単一の activerecord オブジェクトを作成するだけでよいため、より効率的です。

同じクライアントから同時に多数の行を挿入する場合は、複数の VALUES リストを指定した INSERT ステートメントを使用して、一度に複数の行を挿入します。これは、個別の単一行の INSERT ステートメントを使用するよりもかなり高速です (場合によっては何倍も高速です)。空でないテーブルにデータを追加する場合は、bulk_insert_buffer_size 変数を調整して、データの挿入をさらに高速化できます。セクション5.1.3「サーバーシステム変数」を参照してください。

mysqlページから（ただし、他のデータベースでも同じはずです）

于 2012-04-05T03:19:37.863 に答える
20

残念ながら、そのままの状態で Rails を使用することはできません。

ただし、activerecord-importは Rails 3.x の優れた gem でありimport、モデル クラスにメソッドを追加し、単一の SQL 挿入ステートメントとして必要なことを正確に実行します。

于 2013-07-13T20:52:37.723 に答える
-7

ActiveRecord ステートメントを次のようにラップできますActiveRecord::Base.transaction。

ActiveRecord::Base.transaction do 
  1000.times { Post.create(options) } 
end

その他のテクニック については、この記事を参照してください。

于 2015-07-09T00:06:53.470 に答える