Ruby对象映射框架：Sequel
jopen
12年前
Sequel 是一个 Ruby 语言的对象映射框架（ORM），提供了线程安全、连接池以及 DSL 语言用来构造查询和表模型。
特性:
- Sequel provides thread safety, connection pooling and a concise DSL for constructing SQL queries and table schemas.
- Sequel includes a comprehensive ORM layer for mapping records to Ruby objects and handling associated records.
- Sequel supports advanced database features such as prepared statements, bound variables, stored procedures, savepoints, two-phase commit, transaction isolation, master/slave configurations, and database sharding.
- Sequel currently has adapters for ADO, Amalgalite, DataObjects, DB2, DBI, Firebird, IBM_DB, Informix, JDBC, MySQL, Mysql2, ODBC, OpenBase, Oracle, PostgreSQL, SQLite3, Swift, and TinyTDS.
require "rubygems" require "sequel" # connect to an in-memory database DB = Sequel.sqlite # create an items table DB.create_table :items do primary_key :id String :name Float :price end # create a dataset from the items table items = DB[:items] # populate the table items.insert(:name => 'abc', :price => rand * 100) items.insert(:name => 'def', :price => rand * 100) items.insert(:name => 'ghi', :price => rand * 100) # print out the number of records puts "Item count: #{items.count}" # print out the average price puts "The average price is: #{items.avg(:price)}"