Ruby 和 SQLite 新手，不知道为什么我的查询不起作用

Question

所以我有一个运行良好的 Ruby 程序来创建我的所有表，另一个是用于修改数据库的基本用户界面。我猜我不能只选择事物并将其分配给变量吗？我不确定我们到底错在哪里。此代码从不执行菜单，它在询问密码后停止。任何建议都会很棒，我在 Ruby 数据库在线资料中找到的大部分内容都与 Rails 相关。

#!/usr/bin/ruby

require 'sqlite3'

begin

db = SQLite3::Database.open "database.db"
puts "Enter Employee ID:"
empID = gets.chomp
puts "Enter Password:"
passInput = gets.chomp

empPass = db.execute "SELECT password FROM employees WHERE employeeID = #{empID}"


if empPass == passInput
   menu
end

def menu
    i = 0
    loop do
        puts "1. Find a dvd.","2. Display all current inventory.","3. Enter a sale.","4. Add a DVD to inventory.",
        "5. Update inventory.","6. Quit."

        input = gets.chomp

        case input
        when "1"
            puts "Enter sku"
            skuInput = gets.chomp
            db.execute "SELECT * FROM dvds WHERE sku = #{skuInput}"

        when "2"
            db.execute "SELECT * FROM dvds WHERE numInInventory > 0"
        when "3"
            puts "Enter/Scan DVD Sku."
            saleSku = gets.chomp
            db.execute "UPDATE dvds SET numInInventory = numInInventory - 1 WHERE sku = #{salesSku}"
        when "4"
            puts "Enter Sku."
            skuInsert = gets.chomp
            puts "Enter DVD title."
            titleInsert = gets.chomp
            puts "Enter release year."
            yearInsert = gets.chomp
            puts "Enter length of film in minutes."
            lengthInsert = gets.chomp
            puts "Enter price."
            priceInsert=gets.chomp

            isThereInventory = db.execute "SELECT sku FROM dvds WHERE sku = #{skuInsert}"
            db.execute "INSERT INTO dvds VALUES(#{skuInsert}, #{titleInsert}, #{yearInsert}, 1, #{timeInsert}, #{priceInsert})"
        when "5"
            puts "Enter sku of the DVD you wish to update."
            updateSku = gets.chomp
            puts "Enter the number of copies you are adding to inventory."
            updateQuantity = gets.chomp
            db.execute "UPDATE dvds SET numInInventory = numInInventory + #{updateQuantity} WHERE sku = #{updateSku}"
        when "6"
            puts "Goodbye!"
            i = 1
        else
            puts "Invalid option: #{input}"
        end

        break if i == 1
    end
end


rescue SQLite3::Exception => e 

    puts "Exception occured"
    puts e

ensure
    db.close if db
end

Answer 1

db.execute 返回一个数组数组。如果您将代码更改为：

if empPass.flatten.first == passInput
   menu
end

另外，您可能需要在调用它之前定义def menu。

它应该可以工作。