解决方案:使用Rails的insert_all方法进行批量插入。 代码语言:txt 复制 class ProductsController < ApplicationController def create product_records = params[:products].map do |product_params| { name: product_params[:name], price:
问在rails中通过一次调用保存多个对象ENRails 6引入了一种新方法insert_all，它在一条SQL INSERT语句中...
add_indexremove_indexadd_timestampsnewcreatefindfind_byfind_eachfind_or_create_byfind_by_sqlallfirstlasttakeselectwherenotandororderdistinctnonelimitoffsetjoinsleft_outer_joinsincludesgrouphavingcountcount_by_sqlpluckpicksaveupdateupdate_alltouchinsert_alldeletedelete_alldelete_bydestroydestroy_alldestroy_by...
153 changes: 153 additions & 0 deletions 153 activerecord/lib/active_record/insert_all.rb @@ -0,0 +1,153 @@ # frozen_string_literal: true module ActiveRecord class InsertAll attr_reader :model, :connection, :inserts, :on_duplicate, :returning, :unique_by def initialize(model, inserts, ...
At some point, we all need to insert multiple records in one go and have found many workarounds when doing so. Well, Rails 6 comes with a new method out of the box—insert_all, similar toupdate_all. It won’t fire any callbacks and will execute a single SQL query. There is an ...
(count=10000)Post.insert_all!((1..count).map{{title:SecureRandom.alphanumeric}})endend Output: Post Exists? (0.1ms) SELECT 1 AS one FROM "posts" LIMIT ? [["LIMIT", 1]] Post Load (8.6ms) SELECT "posts".* FROM "posts" Post Exists? (0.7ms) SELECT 1 AS one FROM "posts" LIMIT...
insert insertion inspector install install 3.0.0 install gem instance_tag instrumentation integer integration integration runner integration_test internalservererror interpolation invalid invalidstatement inverse inverse_of io ipv6 irb irs_process_scripts iso8601 isolation issue javascript jdbc jdom join join ...
(现在所有保存操作都会成功, 因为还没有数据验证; 等到了下面的内容就会看到一些失败的例子。) Rails 还会在控制台中显示 user.save 对应的 SQL 语句( INSERT INTO "users"... ), 以供参考。我们几乎不会使用原始的 SQL, 所以此后我会省略 SQL。不过, 从 Active Record各种操作生成的 SQL 中可以学到很多...
-- 这是forall forall n in v.first..v.last delete from emp where deptno = v(n); --update emp set sal=8000 where deptno=v(n); --insert into emp(empno) values(v(n)); end; 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. ...
我们在代码中看不到与 INSERT、UPDATE、DELETE 和 SELECT * 查询有关的 SQL 语句,而每个 Model 类都会使用这类查询。这类代码是在后台生成的。但是,旧模式的一个共同特征就是需要复杂的 SQL 语句来检索或汇总数据。另外,Oracle 数据库还提供其他 RDBMS 中没有的强大功能。例如,它可以使用单个层次查询生成数据的...