{"id":708,"date":"2023-08-23T05:18:28","date_gmt":"2023-07-08T20:26:37","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/index.php\/2023\/11\/30\/dao%e3%83%87%e3%82%b6%e3%82%a4%e3%83%b3%e3%83%91%e3%82%bf%e3%83%bc%e3%83%b3\/"},"modified":"2025-08-01T01:49:54","modified_gmt":"2025-07-31T16:49:54","slug":"dao%e3%83%87%e3%82%b6%e3%82%a4%e3%83%b3%e3%83%91%e3%82%bf%e3%83%bc%e3%83%b3","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/dao%e3%83%87%e3%82%b6%e3%82%a4%e3%83%b3%e3%83%91%e3%82%bf%e3%83%bc%e3%83%b3\/","title":{"rendered":"DAO\u30c7\u30b6\u30a4\u30f3\u30d1\u30bf\u30fc\u30f3"},"content":{"rendered":"<p>DAO\u306f\u30c7\u30fc\u30bf\u30a2\u30af\u30bb\u30b9\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u7565\u3067\u3059\u3002DAO\u30c7\u30b6\u30a4\u30f3\u30d1\u30bf\u30fc\u30f3\u306f\u3001\u30c7\u30fc\u30bf\u6c38\u7d9a\u5316\u30ed\u30b8\u30c3\u30af\u3092\u5225\u306e\u30ec\u30a4\u30e4\u30fc\u306b\u5206\u96e2\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u30b5\u30fc\u30d3\u30b9\u306f\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u3078\u306e\u4f4e\u30ec\u30d9\u30eb\u306a\u30a2\u30af\u30bb\u30b9\u64cd\u4f5c\u304c\u3069\u306e\u3088\u3046\u306b\u884c\u308f\u308c\u3066\u3044\u308b\u304b\u306b\u3064\u3044\u3066\u5b8c\u5168\u306b\u7121\u77e5\u306e\u307e\u307e\u306b\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u3053\u308c\u304c\u3001\u30ed\u30b8\u30c3\u30af\u306e\u5206\u96e2\u306e\u539f\u5247\u3068\u3057\u3066\u77e5\u3089\u308c\u3066\u3044\u307e\u3059\u3002<\/p>\n<h2>DAO\u30c7\u30b6\u30a4\u30f3\u30d1\u30bf\u30fc\u30f3<\/h2>\n<p>DAO\u30c7\u30b6\u30a4\u30f3\u30d1\u30bf\u30fc\u30f3\u306b\u3088\u308a\u3001\u5f53\u793e\u306e\u8a2d\u8a08\u306b\u306f\u6b21\u306e\u3088\u3046\u306a\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<ul class=\"post-ul\">\n<li>The model which is transferred from one layer to the other.<\/li>\n<li>The interfaces which provides a flexible design.<\/li>\n<li>The interface implementation which is a concrete implementation of the persistence logic.<\/li>\n<\/ul>\n<h3>DAO\u30d1\u30bf\u30fc\u30f3\u3092\u5b9f\u88c5\u3059\u308b<\/h3>\n<p>\u4e0a\u8a18\u306e\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3092\u4f7f\u7528\u3057\u3066\u3001DAO\u30d1\u30bf\u30fc\u30f3\u3092\u5b9f\u88c5\u3057\u3066\u307f\u307e\u3057\u3087\u3046\u3002\u3053\u3053\u3067\u306f\u30013\u3064\u306e\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\u968e\u5c64\u9593\u3067\u79fb\u3055\u308c\u308bBook\u30e2\u30c7\u30eb\u3002<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\u67d4\u8edf\u306a\u8a2d\u8a08\u3068API\u3092\u63d0\u4f9b\u3059\u308bBookDao\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3002<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>BookDaoImpl\u5177\u8c61\u30af\u30e9\u30b9\u306f\u3001BookDao\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306e\u5b9f\u88c5\u3067\u3059\u3002<\/ol>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/656496cadaa94e2bdf7bffc2\/7-0.png\" alt=\"DAO Pattern\" \/><\/div>\n<h3>DAO\u30d1\u30bf\u30fc\u30f3\u30e2\u30c7\u30eb\u306e\u30af\u30e9\u30b9<\/h3>\n<p>\u3055\u3042\u3001\u30e2\u30c7\u30eb\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u7acb\u3066\u307e\u3057\u3087\u3046\u3002<\/p>\n<pre class=\"post-pre\"><code>package com.scdev.model;\r\n\r\npublic class Books {\r\n\r\n    private int isbn;\r\n    private String bookName;\r\n\r\n    public Books() {\r\n    }\r\n\r\n    public Books(int isbn, String bookName) {\r\n        this.isbn = isbn;\r\n        this.bookName = bookName;\r\n    }\r\n\r\n    \/\/ getter setter methods\r\n}\r\n<\/code><\/pre>\n<p>\u30b7\u30f3\u30d7\u30eb\u306a\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3067\u3001\u8981\u7d20\u306f\u308f\u305a\u304b2\u3064\u3060\u3051\u3067\u3001\u4e8b\u3092\u30b7\u30f3\u30d7\u30eb\u306b\u4fdd\u3064\u305f\u3081\u3067\u3059\u3002<\/p>\n<h3>DAO\u30d1\u30bf\u30fc\u30f3\u306e\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9<\/h3>\n<p>\u6c38\u7d9a\u5316\u30ec\u30d9\u30eb\u3067\u95a2\u9023\u4ed8\u3051\u3089\u308c\u305f\u30c7\u30fc\u30bf\u306b\u30a2\u30af\u30bb\u30b9\u3059\u308b\u305f\u3081\u306e\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u5b9a\u7fa9\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<pre class=\"post-pre\"><code>package com.scdev.dao;\r\n\r\nimport com.scdev.model.Books;\r\n\r\nimport java.util.List;\r\n\r\npublic interface BookDao {\r\n\r\n    List&lt;Books&gt; getAllBooks();\r\n    Books getBookByIsbn(int isbn);\r\n    void saveBook(Books book);\r\n    void deleteBook(Books book);\r\n}\r\n<\/code><\/pre>\n<h3>DAO\u30d1\u30bf\u30fc\u30f3\u306e\u5b9f\u88c5<\/h3>\n<p>\u6b21\u306b\u3001\u4e0a\u8a18\u306e\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3092\u5b9f\u88c5\u3057\u305f\u5177\u4f53\u7684\u306a\u30af\u30e9\u30b9\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code>package com.scdev.daoimpl;\r\n\r\nimport com.scdev.dao.BookDao;\r\nimport com.scdev.model.Books;\r\n\r\nimport java.util.ArrayList;\r\nimport java.util.List;\r\n\r\npublic class BookDaoImpl implements BookDao {\r\n\r\n    \/\/list is working as a database\r\n    private List&lt;Books&gt; books;\r\n\r\n    public BookDaoImpl() {\r\n        books = new ArrayList&lt;&gt;();\r\n        books.add(new Books(1, \"Java\"));\r\n        books.add(new Books(2, \"Python\"));\r\n        books.add(new Books(3, \"Android\"));\r\n    }\r\n\r\n    @Override\r\n    public List&lt;Books&gt; getAllBooks() {\r\n        return books;\r\n    }\r\n\r\n    @Override\r\n    public Books getBookByIsbn(int isbn) {\r\n        return books.get(isbn);\r\n    }\r\n\r\n    @Override\r\n    public void saveBook(Books book) {\r\n        books.add(book);\r\n    }\r\n\r\n    @Override\r\n    public void deleteBook(Books book) {\r\n        books.remove(book);\r\n    }\r\n}\r\n<\/code><\/pre>\n<h3>DAO\u30d1\u30bf\u30fc\u30f3\u3092\u4f7f\u7528\u3059\u308b<\/h3>\n<p>\u6700\u7d42\u7684\u306b\u3001\u79c1\u305f\u3061\u306f\u3053\u306e\u5b9f\u88c5\u3092main()\u30e1\u30bd\u30c3\u30c9\u3067\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code>package com.scdev;\r\n\r\nimport com.scdev.dao.BookDao;\r\nimport com.scdev.daoimpl.BookDaoImpl;\r\nimport com.scdev.model.Books;\r\n\r\npublic class AccessBook {\r\n\r\n    public static void main(String[] args) {\r\n\r\n        BookDao bookDao = new BookDaoImpl();\r\n\r\n        for (Books book : bookDao.getAllBooks()) {\r\n            System.out.println(\"Book ISBN : \" + book.getIsbn());\r\n        }\r\n\r\n        \/\/update student\r\n        Books book = bookDao.getAllBooks().get(1);\r\n        book.setBookName(\"Algorithms\");\r\n        bookDao.saveBook(book);\r\n    }\r\n}\r\n\r\n<\/code><\/pre>\n<h3>DAO\u30d1\u30bf\u30fc\u30f3\u306e\u5229\u70b9<\/h3>\n<p>DAO\u30d1\u30bf\u30fc\u30f3\u3092\u4f7f\u7528\u3059\u308b\u3068\u3001\u591a\u304f\u306e\u5229\u70b9\u304c\u3042\u308a\u307e\u3059\u3002\u3053\u3053\u3067\u306f\u3044\u304f\u3064\u304b\u3092\u6319\u3052\u307e\u3057\u3087\u3046\u3002<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>\u6c38\u7d9a\u6027\u306e\u30e1\u30ab\u30cb\u30ba\u30e0\u3092\u5909\u66f4\u3059\u308b\u5834\u5408\u3001\u30b5\u30fc\u30d3\u30b9\u5c64\u306f\u30c7\u30fc\u30bf\u306e\u51fa\u6240\u3092\u77e5\u308b\u5fc5\u8981\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u4f8b\u3048\u3070\u3001MySQL\u304b\u3089MongoDB\u306b\u5207\u308a\u66ff\u3048\u308b\u3053\u3068\u3092\u8003\u3048\u3066\u3044\u308b\u5834\u5408\u3001\u5909\u66f4\u306fDAO\u5c64\u306e\u307f\u3067\u884c\u3046\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: none;\">\n<ol>DAO\u30d1\u30bf\u30fc\u30f3\u306f\u3001\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u7570\u306a\u308b\u30b3\u30f3\u30dd\u30fc\u30cd\u30f3\u30c8\u9593\u306e\u4f4e\u3044\u7d50\u5408\u3092\u5f37\u8abf\u3057\u3066\u3044\u307e\u3059\u3002\u3057\u305f\u304c\u3063\u3066\u3001\u30d3\u30e5\u30fc\u5c64\u306fDAO\u5c64\u306b\u4f9d\u5b58\u305b\u305a\u3001\u30b5\u30fc\u30d3\u30b9\u5c64\u306e\u307f\u304c\u4f9d\u5b58\u3057\u3001\u305d\u308c\u3082\u5177\u4f53\u7684\u306a\u5b9f\u88c5\u3067\u306f\u306a\u304f\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u304b\u3089\u4f9d\u5b58\u3057\u307e\u3059\u3002<\/ol>\n<\/li>\n<\/ol>\n<p>&nbsp;<\/p>\n<ol>\n<li style=\"list-style-type: 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