rails g迁移添加列
$ rails generate migration AddDetailsToProducts part_number:string price:decimal
如何创建迁移rails
rails g migration AddPartNumberToProducts
在rails迁移中使用SQL
def change
execute <<-SQL
UPDATE table1
SET column1 = "value"
SQL
end
ruby on rails db migrate
rails db:migrate
如何在ruby中创建SQL表
def self.create_table
sql = <<-SQL
CREATE TABLE IF NOT EXISTS IF NOT EXISTS students (
name TEXT,
grade TEXT
)
SQL
DB[:conn].execute(sql)
end
里亚尔db下来
bin/rails db:migrate:down VERSION=YYYYMMDDHHMMSS