{"id":758,"date":"2023-04-12T01:33:25","date_gmt":"2023-04-01T04:44:07","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/index.php\/2023\/11\/30\/dao%e8%ae%be%e8%ae%a1%e6%a8%a1%e5%bc%8f\/"},"modified":"2025-08-03T06:40:12","modified_gmt":"2025-08-02T22:40:12","slug":"dao%e8%ae%be%e8%ae%a1%e6%a8%a1%e5%bc%8f","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/dao%e8%ae%be%e8%ae%a1%e6%a8%a1%e5%bc%8f\/","title":{"rendered":"\u6df1\u5165\u7406\u89e3DAO\u8bbe\u8ba1\u6a21\u5f0f\uff1a\u6570\u636e\u8bbf\u95ee\u5bf9\u8c61\u7684\u539f\u7406\u3001\u5e94\u7528\u4e0e\u6700\u4f73\u5b9e\u8df5"},"content":{"rendered":"<p>\u8fd9\u662f\u6587\u7ae0\u300aDAO\u8bbe\u8ba1\u6a21\u5f0f\u300b\u7684\u7b2c1\u90e8\u5206\uff08\u51711\u90e8\u5206\uff09\u3002<\/p>\n<p>\u5185\u5bb9\u7247\u6bb5: DAO\u5373\u6570\u636e\u8bbf\u95ee\u5bf9\u8c61\uff08Data Access Object\uff09\u7684\u7f29\u5199\u3002DAO\u8bbe\u8ba1\u6a21\u5f0f\u7528\u4e8e\u5728\u5355\u72ec\u7684\u5c42\u4e2d\u5206\u79bb\u6570\u636e\u6301\u4e45\u6027\u903b\u8f91\u3002\u901a\u8fc7\u8fd9\u79cd\u65b9\u5f0f\uff0c\u670d\u52a1\u5b8c\u5168\u4e0d\u77e5\u9053\u5982\u4f55\u6267\u884c\u4f4e\u7ea7\u522b\u7684\u6570\u636e\u5e93\u8bbf\u95ee\u64cd\u4f5c\u3002\u8fd9\u5c31\u662f\u6240\u8c13\u7684\u903b\u8f91\u5206\u79bb\u539f\u5219\u3002<\/p>\n<h2>DAO \u8bbe\u8ba1\u6a21\u5f0f<\/h2>\n<p>\u4f7f\u7528DAO\u8bbe\u8ba1\u6a21\u5f0f\uff0c\u6211\u4eec\u4f9d\u8d56\u4ee5\u4e0b\u7ec4\u4ef6\u6765\u5b8c\u6210\u8bbe\u8ba1\uff1a<\/p>\n<ul class=\"post-ul\">\n<li>\u5728\u5404\u5c42\u4e4b\u95f4\u4f20\u8f93\u7684\u6a21\u578b\u3002<\/li>\n<li>\u63d0\u4f9b\u7075\u6d3b\u8bbe\u8ba1\u7684\u63a5\u53e3\u3002<\/li>\n<li>\u63a5\u53e3\u5b9e\u73b0\uff0c\u662f\u6301\u4e45\u6027\u903b\u8f91\u7684\u5177\u4f53\u5b9e\u73b0\u3002<\/li>\n<\/ul>\n<h3>\u5b9e\u65bdDAO\u6a21\u5f0f<\/h3>\n<p>\u4f7f\u7528\u4e0a\u8ff0\u7ec4\u4ef6\uff0c\u8ba9\u6211\u4eec\u5c1d\u8bd5\u5b9e\u73b0DAO\u6a21\u5f0f\u3002\u6211\u4eec\u5c06\u5728\u8fd9\u91cc\u4f7f\u7528\u4e09\u4e2a\u7ec4\u4ef6\uff1a<\/p>\n<ol>\n<li>\u4ece\u4e00\u5c42\u4f20\u9012\u5230\u53e6\u4e00\u5c42\u7684\u4e66\u6a21\u578b\u3002<\/li>\n<li>\u63d0\u4f9b\u7075\u6d3b\u8bbe\u8ba1\u548cAPI\u4ee5\u5b9e\u73b0\u7684BookDao\u63a5\u53e3\u3002<\/li>\n<li>BookDaoImpl\u5177\u4f53\u7c7b\u662fBookDao\u63a5\u53e3\u7684\u5b9e\u73b0\u3002<\/li>\n<\/ol>\n<div><img decoding=\"async\" class=\"post-images\" title=\"\" src=\"https:\/\/cdn.silicloud.com\/blog-img\/blog\/img\/656484bba4b2f92e6c7301bb\/7-0.png\" alt=\"DAO Pattern\" \/><\/div>\n<h3>DAO\u6a21\u5f0f\u7684\u7c7b<\/h3>\n<p>\u73b0\u5728\uff0c\u8ba9\u6211\u4eec\u628a\u6211\u4eec\u7684\u6a21\u578b\u5bf9\u8c61\u653e\u4e0a\u53bb\u3002<\/p>\n<pre class=\"post-pre\"><code>package com.Olivia.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 \u65b9\u6cd5\r\n}\r\n<\/code><\/pre>\n<p>\u8fd9\u662f\u4e00\u4e2a\u7b80\u5355\u7684\u5bf9\u8c61\uff0c\u53ea\u6709\u4e24\u4e2a\u5c5e\u6027\uff0c\u4ee5\u4fdd\u6301\u7b80\u5355\u3002<\/p>\n<h3>DAO\u6a21\u5f0f\u63a5\u53e3<\/h3>\n<p>\u6211\u4eec\u6765\u5b9a\u4e49\u8bbf\u95ee\u4e0e\u6301\u4e45\u5316\u7ea7\u522b\u76f8\u5173\u7684\u6570\u636e\u7684\u63a5\u53e3\u3002<\/p>\n<pre class=\"post-pre\"><code>package com.Olivia.dao;\r\n\r\nimport com.Olivia.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\u6a21\u5f0f\u7684\u5b9e\u73b0<\/h3>\n<p>\u63a5\u4e0b\u6765\uff0c\u6211\u4eec\u521b\u5efa\u4e00\u4e2a\u5b9e\u73b0\u4e0a\u8ff0\u63a5\u53e3\u7684\u5177\u4f53\u7c7b\u3002<\/p>\n<pre class=\"post-pre\"><code>package com.Olivia.daoimpl;\r\n\r\nimport com.Olivia.dao.BookDao;\r\nimport com.Olivia.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    \/\/\u5217\u8868\u4f5c\u4e3a\u6570\u636e\u5e93\u4f7f\u7528\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>\u4f7f\u7528DAO\u6a21\u5f0f<\/h3>\n<p>\u6700\u540e\uff0c\u6211\u4eec\u5728\u6211\u4eec\u7684main()\u65b9\u6cd5\u4e2d\u4f7f\u7528\u4e86\u8fd9\u4e2a\u5b9e\u73b0\u3002<\/p>\n<pre class=\"post-pre\"><code>package com.Olivia;\r\n\r\nimport com.Olivia.dao.BookDao;\r\nimport com.Olivia.daoimpl.BookDaoImpl;\r\nimport com.Olivia.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(\"\u56fe\u4e66ISBN : \" + book.getIsbn());\r\n        }\r\n\r\n        \/\/\u66f4\u65b0\u56fe\u4e66\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\u6a21\u5f0f\u7684\u4f18\u70b9<\/h3>\n<p>\u4f7f\u7528DAO\u6a21\u5f0f\u6709\u5f88\u591a\u4f18\u70b9\u3002\u8ba9\u6211\u4eec\u5728\u8fd9\u91cc\u5217\u4e3e\u4e00\u4e9b\uff1a<\/p>\n<ol>\n<li>\u5728\u66f4\u6539\u6301\u4e45\u5316\u673a\u5236\u65f6\uff0c\u670d\u52a1\u5c42\u751a\u81f3\u4e0d\u9700\u8981\u77e5\u9053\u6570\u636e\u6765\u81ea\u54ea\u91cc\u3002\u4f8b\u5982\uff0c\u5982\u679c\u60a8\u8003\u8651\u4ece\u4f7f\u7528MySQL\u5207\u6362\u5230MongoDB\uff0c\u53ea\u9700\u5728DAO\u5c42\u8fdb\u884c\u66f4\u6539\u5373\u53ef\u3002<\/li>\n<li>DAO\u6a21\u5f0f\u5f3a\u8c03\u5e94\u7528\u7a0b\u5e8f\u4e0d\u540c\u7ec4\u4ef6\u4e4b\u95f4\u7684\u4f4e\u8026\u5408\u3002\u56e0\u6b64\uff0c\u89c6\u56fe\u5c42\u4e0d\u4f9d\u8d56DAO\u5c42\uff0c\u53ea\u6709\u670d\u52a1\u5c42\u4f9d\u8d56\u5b83\uff0c\u5373\u4f7f\u662f\u901a\u8fc7\u63a5\u53e3\u800c\u4e0d\u662f\u5177\u4f53\u5b9e\u73b0\u3002<\/li>\n<li>\u7531\u4e8e\u6301\u4e45\u5316\u903b\u8f91\u662f\u5b8c\u5168\u5206\u79bb\u7684\uff0c\u56e0\u6b64\u7f16\u5199\u5355\u5143\u6d4b\u8bd5\u4ee5\u6d4b\u8bd5\u5404\u4e2a\u7ec4\u4ef6\u4f1a\u66f4\u52a0\u5bb9\u6613\u3002\u4f8b\u5982\uff0c\u5982\u679c\u60a8\u4f7f\u7528JUnit\u548cMockito\u8fdb\u884c\u6d4b\u8bd5\u6846\u67b6\uff0c\u5f88\u5bb9\u6613\u5bf9\u5e94\u7528\u7a0b\u5e8f\u7684\u5404\u4e2a\u7ec4\u4ef6\u8fdb\u884c\u6a21\u62df\u3002<\/li>\n<li>\u7531\u4e8e\u5728DAO\u6a21\u5f0f\u4e2d\u4f7f\u7528\u63a5\u53e3\uff0c\u5b83\u8fd8\u5f3a\u8c03\u4e86&#8221;\u4f7f\u7528\u63a5\u53e3\u800c\u4e0d\u662f\u5b9e\u73b0&#8221;\u7684\u7f16\u7a0b\u98ce\u683c\uff0c\u8fd9\u662f\u4e00\u79cd\u4f18\u79c0\u7684\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\u98ce\u683c\u3002<\/li>\n<\/ol>\n<h3>DAO\u6a21\u5f0f\u7684\u7ed3\u8bba<\/h3>\n<p>\u5728\u672c\u6587\u4e2d\uff0c\u6211\u4eec\u5b66\u4e60\u4e86\u5982\u4f55\u4f7f\u7528DAO\u8bbe\u8ba1\u6a21\u5f0f\u6765\u5f3a\u8c03\u6301\u4e45\u6027\u903b\u8f91\u7684\u5206\u79bb\uff0c\u4f7f\u6211\u4eec\u7684\u7ec4\u4ef6\u677e\u8026\u5408\u3002\u8bbe\u8ba1\u6a21\u5f0f\u53ea\u662f\u57fa\u4e8e\u4e00\u79cd\u7f16\u7a0b\u65b9\u5f0f\uff0c\u56e0\u6b64\u4e0e\u8bed\u8a00\u548c\u6846\u67b6\u65e0\u5173\u3002\u8bf7\u968f\u610f\u5728\u4e0b\u9762\u7684\u8bc4\u8bba\u4e2d\u7559\u4e0b\u60a8\u7684\u610f\u89c1\u3002\u901a\u8fc7\u4e0b\u9762\u7684\u94fe\u63a5\u4e0b\u8f7dDAO\u793a\u4f8b\u9879\u76ee\u3002<\/p>\n<p>\u4e0b\u8f7d DAO \u6a21\u5f0f\u793a\u4f8b\u9879\u76ee<\/p>\n<p>\u53c2\u8003\u8d44\u6599\uff1aOracle\u6587\u6863\uff0c\u7ef4\u57fa\u767e\u79d1\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u8fd9\u662f\u6587\u7ae0\u300aDAO\u8bbe\u8ba1\u6a21\u5f0f\u300b\u7684\u7b2c1\u90e8\u5206\uff08\u51711\u90e8\u5206\uff09\u3002 \u5185\u5bb9\u7247\u6bb5: DAO\u5373\u6570\u636e\u8bbf\u95ee\u5bf9\u8c61\uff08Data Access  [&hellip;]<\/p>\n","protected":false},"author":8,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[2052,1326,2053,720,912],"class_list":["post-758","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-dao","tag-1326","tag-2053","tag-720","tag-912"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ 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