質問編集履歴
6
修正
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@@ -8,6 +8,8 @@
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ruby上で実行してもだめだったので、sqlite3上でやってみたのですがそれでもだめでした
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### 発生している問題・エラーメッセージ
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5
タイトル変更
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@@ -1 +1 @@
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1
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-
sqlite3,
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ruby, dbi, sqlite3,テーブルデータのdelete
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test
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4
文法修正
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test
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@@ -152,8 +152,6 @@
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book_info.publish_date = Date.new( year, month, day )
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-
#ここに大事な忘れ物があります(講義中に解説します)
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-
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@dbh.do("insert into bookinfos values
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(
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3
insert date型修正
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test
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@@ -38,7 +38,7 @@
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insert into bookinfos values('aaa', 'bbb', 1, 2020
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insert into bookinfos values('aaa', 'bbb', 1, '20200404');
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2
hoge
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test
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@@ -38,7 +38,7 @@
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insert into bookinfos values('aaa', 'bbb', 1, 2020
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insert into bookinfos values('aaa', 'bbb', 1, 2020,4,4);
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1
実際のコード全部載せました
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test
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@@ -50,6 +50,224 @@
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```ruby
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require'date'
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require'dbi'
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61
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63
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class BookInfo
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64
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attr_accessor :title, :author, :pages, :publish_date
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def initialize(title, author, pages, publish_date)
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@title = title
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@author = author
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@pages = pages
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@publish_date = publish_date
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end
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def to_s
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82
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"#{@title}, #{@author}, #{@pages}, #{@publish_date}"
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end
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def toFormattedString(sep="\n")
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"書籍名:#{@title}#{sep}著者名:#{@author}#{sep}ページ数:#{@pages.to_s}#{sep}発刊日:#{@publish_date.to_s}#{sep}"
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end
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end
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96
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class BookInfoManger
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def initialize(db_fname = "book_infos.db")
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@db_fname = db_fname
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@dbh = DBI.connect("DBI:SQLite3:#{@db_fname}")
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@dbh.do("create table if not exists bookinfos(
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title varchar(50),
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author varchar(50),
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pages int,
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publish_date date);")
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end
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def addBookInfo
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book_info = BookInfo.new("", "", 0, Date.new)
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print "書籍名:"
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book_info.title = gets.chomp
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print "著者名:"
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book_info.author = gets.chomp
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print "ページ数:"
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138
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book_info.pages = gets.chomp.to_i
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140
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print "発刊年:"
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year = gets.chomp.to_i
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print "発刊月:"
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month = gets.chomp.to_i
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print "発刊日:"
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day = gets.chomp.to_i
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book_info.publish_date = Date.new( year, month, day )
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154
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+
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155
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#ここに大事な忘れ物があります(講義中に解説します)
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156
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157
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@dbh.do("insert into bookinfos values
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158
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159
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(
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160
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'#{book_info.title} ',
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'#{book_info.author} ',
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#{book_info.pages},
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'#{book_info.publish_date} ');")
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168
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end
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170
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def listAllBookInfos
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175
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@dbh.select_all("select * from bookinfos") do |row|
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puts BookInfo.new(row[:title], row[:author] ,
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row[:pages] , row[:publish_date]).toFormattedString
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end
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182
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end
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184
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185
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186
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187
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def deleteBookInfos
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188
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189
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print "削除する書籍名:"
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190
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191
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d_title = gets.chomp
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192
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193
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puts d_title.class
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194
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195
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@dbh.do("delete from bookinfos where title = '#{d_title}';")
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196
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197
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puts "削除完了"
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198
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199
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end
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200
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201
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202
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203
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def run
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204
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nums = []
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206
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207
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while true
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209
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#メニュー表示(puts)
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210
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211
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print "1.蔵書データの登録
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212
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213
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2.蔵書データの表示
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214
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215
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4.蔵書データの削除
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216
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217
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9.終了
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218
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219
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番号を選んでください(1,2,4,9):"
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220
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221
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#メニュー番号受付(gets.chomp)
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num = gets.chomp
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224
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+
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#ログの保存
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226
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nums.push(num)
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#メニュー番号に応じた処理を実行する(case / when)
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231
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case num
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232
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+
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233
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when "1"
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234
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+
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235
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#登録処理(addBookInfo)
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236
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+
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237
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addBookInfo
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238
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+
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239
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when "2"
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240
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+
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241
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#表示処理(listAllBookInfos)
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242
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+
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243
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+
listAllBookInfos
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244
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+
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245
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when "4"
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246
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+
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247
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deleteBookInfos
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248
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+
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249
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when "9"
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250
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+
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251
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+
break
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252
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+
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253
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+
#1番に戻る
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254
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+
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255
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+
end
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256
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+
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257
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+
end
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258
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+
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259
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+
end
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260
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+
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261
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+
end
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262
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+
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263
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+
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264
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+
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265
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+
bim = BookInfoManger.new
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266
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+
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267
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bim.run
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268
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+
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269
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+
```
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270
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+
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53
271
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### 試したこと
|
|
54
272
|
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55
273
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### 補足情報（FW/ツールのバージョンなど）
|