irb(main):008:0> r = ActiveRecord::Base.connection.execute'show create database ott_remote_cms_production'=>#<Mysql2::Result:0x002b338fe61d68 @query_options={:as=>:array, :async=>false, :cast_booleans=>false, :symbolize_keys=>false, :database_timezone=>:utc, :application_timezone=...
CREATE TABLE "countries" ("id" integer PRIMARY KEY AUTOINCREMENT NOT NULL, "name" varchar, "population" integer, "created_at" datetime NOT NULL, "updated_at" datetime NOT NULL); 在rails console建立一条记录,可以通过底层数据库sqlite3查看: $ sqlite3 db/development.sqlite3 > select * from co...
Once set up, you can open up a Rails console and run a query to test it out. $ rails console [1] pry(main)> User.first You should see your application name in sqlcommenter format. User Load (0.6ms) SELECT `user`.* FROM `user` ORDER BY `user`.`id` ASC LIMIT 1 /*application...
10. **Rails Console**:提供了一个交互式的命令行工具,用于检查和调试应用,执行Ruby代码,以及与数据库交互。 11. **Rails Generators**:Rails的生成器可以帮助快速创建新的控制器、模型、迁移等,大大提高了... Ruby-sqltrackerRailsSQL查询跟踪器 在复杂的Rails应用中,数据库查询的性能往往成为系统瓶颈,sql_tr...
Up to now, we've been using .find or .find_by, which are designed to return only a single object (notice the LIMIT 1 in the generated SQL query?). .where is used when it is desirable to get a collection of objects.Let's get a collection of non-administrator users and see what ...
在Ruby on Rails中,可以使用SQL查询来获取特定用户的记录。 SQL(Structured Query Language)是一种用于管理关系型数据库的标准化语言。它允许开发人员通过使用各种查询语句来操作数据库中的数据。 要查询特定用户的记录,可以使用Ruby on Rails提供的Active Record模块来执行SQL查询。Active Record是Ruby on Rails中的一...
Console --sandbox 2.1.2 not fixed? was updated by klkk 03:18 AM #1194 / 2.x / ✓resolved ticket Rack::Utils.parse_nested_query throws exceptions, leads to 500 errors on every Rails app was updated by klkk 03:18 AM #2611 / 3.x / ✓stale ticket Array#to_proc was upd...
We append0;to prevent IRB from printing the query output to the console and skew memory usage results. MemoryProfileroutputs loads of data, but we’re interested in the top few lines: Total allocated: 1723042 bytes (11577 objects) Total retained: 1536160 bytes (10183 objects) ...
config.console让你设置当你运行rails console的时候用作控制台的类。 它最好在console代码块下运行: console do this block is called only when running console, so we can safely require pry here require “pry” config.console = Pry end
Use Arql to query SQLite3 database file You can use Arql to view SQLite3 database files, for example: arql -d db/development.sqlite3 Development After checking out the code, runbin/setupto install dependencies. You can also runbin/consolefor an interactive prompt that will allow you to ex...