问Rails SQL create table语法EN指定GLOBAL TEMPORARY关键字将表定义为全局临时表。表定义是全局的(对所有...
这条命令将在你的db/migrate目录下创建001_create_people.rb文件,我们可以通过它来创建people(people是person的复数)表: $ rake db:migrate == CreatePeople: migrating === -- create_table(:people) -> 0.1900s == CreatePeople: migrated (0.1900s) === 现在,你会发现你的数据库中已经多了一个people表...
create test/models/user_test.rb create test/fixtures/users.yml Process finished with exit code 0. 1. 2. 3. 4. 5. 6. 7. 8. 9. 后台操作和上面的命令号里一样,迁移数据表 常用类型 class CreateTests < ActiveRecord::Migration[5.0] def change create_table :tests do |t| t.string :name ...
create test/fixtures/posts.yml #将db/migrate/20181012111922_create_posts.rb映射文件映射到数据库中,创建post数据表 /vagrant/data_symtem$ rake db:migrate #系统返回信息 == 20181012111922 CreatePosts: migrating === -- create_table(:posts) -> 0.0136s == 20181012111922 CreatePosts: migrated (0.0151s...
· 初始化数据库：rails db:create · 运行Rails服务器：rails s Rails生成 Rails团队的首要目标是高效地构建核心应用程序功能。Rails系统拥有大量生成器，能帮助用户完成一些手动作业。生成器除了节省时间，还有一些其他优点：· 生成器能够为应用程序测试套件设置基本规格。它们会为用户提供一些基本例子而非编写复杂的...
$ rake db:migrate...==20151208044806CreateShops:migrating===--create_table(:shops)rake aborted!StandardError:An error has occurred,thisand all later migrations canceled:PG::UndefinedObject:ERROR:type"json"does not existLINE1:...yingNOTNULL,"logo"character varying,"images"json,"reg......
CREATETABLE`black_ips` ( `id`int(11)NOTNULLAUTO_INCREMENT, `ip`varchar(255)DEFAULTNULL, `created_at` datetimeNOTNULL, `updated_at` datetimeNOTNULL, `send_time` datetimeDEFAULTNULL, `black_tools` tinyint(1)DEFAULT'0'COMMENT'黑客工具 false:否 true:是',PRIMARYKEY (`id`), ...
create_table :orders do |t| t.column :name, :string t.column :description, :string end end 5. 您希望编辑生成的脚本。在终端窗口中,输入以下命令: gedit db/migrate/003_create_invoices.rb 6. 用以下内容替换 self.up 部分,然后保存并关闭该文件。 def self.up create_table :invoices...
def test_create_table_raises_if_already_exists connection = Person.connection connection.drop_table :testings, if_exists: true Contributor Author fatkodima Dec 9, 2017 Just noticed, whole line should be replaced with force for create_table and same in the next test Member rafaelfranca Dec...
# 生成迁移文件rails g migration CreateJoinTableCustomerProduct customer product# 迁移rails db:migrate# 版本回滚rails db:rollbackstep=1 这里在学习的时候,遇到一个东西,困惑了半天,那就是外键,外键用于两个表之间一对多关系。一个用户能写多篇文章,所以 article model belongs_to,而 user model has_many。