create_table(:artists)doprimary_key:idString:nameconstraint(:name_min_length){char_length(name)>2}end 不使用语句块,你还可以使用类似Dataset#where作为方法的参数达到同样效果: create_table(:artists)doprimary_key:idString:nameconstraint(:name_length_range,Sequel.function(:char_length,:name)=>3..50...
require'sequel'DB = Sequel.sqlite# memory database, requires sqlite3DB.create_table:itemsdoprimary_key:idString:nameFloat:priceenditems = DB[:items]# Create a dataset# Populate the tableitems.insert(:name=>'abc',:price=> rand *100) items.insert(:name=>'def',:price=> rand *100) items...
create{|p| p.title = 'hello world'} Hooks¶ ↑ You can execute custom code when creating, updating, or deleting records by defining hook methods. The before_create and after_create hook methods wrap record creation. The before_update and after_update hook methods wrap record updating. ...
dataset.update(:updated_at=>:DateValue.sql_function('1/1/2001')) Schema Manipulation DB.create_table:itemsdoprimary_key:idString:name,:unique=>true,:null=>falseTrueClass:active,:default=>trueforeign_key:category_id,:categoriesDateTime:created_atindex:created_atendDB.drop_table:itemsDB.create_t...
按照需求，记录插入的时间，会存储到create_time/insert_time字段中，记录更新的时间，会存储到update_...
post.update(:title => 'hey there', :updated_by=>'foo') 1. 创建新记录 可以通过调用Model.create方法创建新记录: post = Post.create(:title => 'hello world') 1. 另一种方式是先创建实例,然后再保存: post = Post.new post.title = 'hello world' ...
# or DB.loggers << Logger.new(...) Using raw SQL DB.run "CREATE TABLE users (name VARCHAR(255) NOT NULL, age INT(3) NOT NULL)" dataset = DB["SELECT age FROM users WHERE name = ?", name] dataset.map(:age) DB.fetch("SELECT name FROM users") do |row| ...
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create{|p| p.title = 'hello world'} Hooks¶ ↑ You can execute custom code when creating, updating, or deleting records by defining hook methods. The before_create and after_create hook methods wrap record creation. The before_update and after_update hook methods wrap record updating. ...