Question

我收到以下输出

INSERT INTO AIRPORTS VALUES(null, #{iata} , #{latitude} , #{longitude}, #{name}, #{city})airportsScript.rb:27:in `query': You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '' at line 1 (Mysql2::Error)
    from airportsScript.rb:27:in `block in getAirports'
    from airportsScript.rb:20:in `each'
    from airportsScript.rb:20:in `getAirports'
    from airportsScript.rb:32:in `<main>'

从这个脚本（实际上是完整的脚本）：

#!/usr/bin/env ruby 

require 'rubygems'
require 'json'
require 'rest-client' 
require 'uri'
require 'mysql2'


def getAirports()

client = Mysql2::Client.new(:host => "localhost", :username => "****", :password => "****" , :database => "****")

  url='https://api.flightstats.com/flex/airports/rest/v1/json/all?appId=APPIDHIDENKey=KEYHIDDEN'
  airportsJson = JSON.parse(RestClient.get(url))
  for airports in airportsJson["airports"]
          iata = airports["iata"]
          latitude = airports["latitude"]
          longitude = airports["longitude"]
          name = airports["name"]
          city = airports["city"]
          print        'INSERT INTO AIRPORTS VALUES(null, #{iata} , #{latitude} , #{longitude}, #{name}, #{city})'
          client.query('INSERT INTO AIRPORTS VALUES(null, #{iata} , #{latitude} , #{longitude}, #{name}, #{city})')
  end
  client.close
end

getAirports()

正如您可能注意到的那样，在输出中第一行来自print 'INSERT INTO AIRPORTS VALUES(null, #{iata} , #{latitude} , #{longitude}, #{name}, #{city})'为什么我无法获得iata，latitude，long等变量的值而不是实际的字符串＆＃34;＃{ IATA}＆＃34;

我是ruby的新手，这是我的第一个脚本btw。

Answer 1

使用“双引号”而不是“单引号”来插入变量。

2.0.0-p353 :001 > var = "foo"
 => "foo" 
2.0.0-p353 :002 > 'Hello #{var}'
 => "Hello \#{var}" 
2.0.0-p353 :003 > "Hello #{var}"
 => "Hello foo"

Ruby在sql查询中连接字符串

1 个答案: