Question

我想将tabe Im的主键设置为3个整数的复合键。我在Ruby脚本中这样做：

  ...Ruby Script
  .............

  .............
  #Begin database operations
  begin
  db = SQLite3::Database.new ("#{filename.split('.')[0]}" + ".db")

  db.execute ("CREATE TABLE IF NOT EXISTS AIRED (programCode INTEGER , fromDate INTEGER, 
  toDate INTEGER, PRIMARY KEY(programCode,fromDate , toDate), program TEXT, channel  TEXT, 
   weekday TEXT, startTime TEXT, endTime TEXT, duration TEXT)")

  rescue SQLite3::Exception => e
  puts "Exception occured"
  puts e.message
  puts e.backtrace

  ensure
  db.close if db

  end

   .........

当我运行此脚本时，我在终端

收到以下错误

      Exception occured
      near "program": syntax error
      /Users/AM/.rvm/gems/ruby-2.0.0-p195/gems/sqlite3-1.3.7/lib/sqlite3/database.rb:91:in `initialize'
      /Users/AM/.rvm/gems/ruby-2.0.0-p195/gems/sqlite3-1.3.7/lib/sqlite3/database.rb:91:in `new'
     /Users/AM/.rvm/gems/ruby-2.0.0-p195/gems/sqlite3-1.3.7/lib/sqlite3/database.rb:91:in `prepare'
     /Users/AM/.rvm/gems/ruby-2.0.0-p195/gems/sqlite3-1.3.7/lib/sqlite3/database.rb:134:in `execute'
      csv_parser.rb:60:in `<main>'

我看了this SO帖子，看看如何制作复合键：

我做错了什么？

由于

Answer 1

您不能在列定义结束之前放置表约束。你需要写这个

db.execute <<__SQL__
CREATE TABLE IF NOT EXISTS AIRED (
  programCode INTEGER,
  fromDate    INTEGER,
  toDate      INTEGER,
  program     TEXT,
  channel     TEXT,
  weekday     TEXT,
  startTime   TEXT,
  endTime     TEXT,
  duration    TEXT,
  PRIMARY KEY (programCode, fromDate, toDate)
)
__SQL__

在SQLite3中设置复合主键时出错

1 个答案: