{"id":175395,"date":"2024-11-08T05:31:20","date_gmt":"2024-11-07T21:31:20","guid":{"rendered":"https:\/\/server.hk\/cnblog\/175395\/"},"modified":"2024-11-08T05:31:20","modified_gmt":"2024-11-07T21:31:20","slug":"%e5%a6%82%e4%bd%95%e4%bd%bf%e7%94%a8spring-data-jpa%e5%84%aa%e9%9b%85%e5%9c%b0%e5%af%a6%e7%8f%be%e6%a8%82%e8%a7%80%e9%8e%96%e5%92%8c%e6%82%b2%e8%a7%80%e9%8e%96","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/175395\/","title":{"rendered":"\u5982\u4f55\u4f7f\u7528Spring Data JPA\u512a\u96c5\u5730\u5be6\u73fe\u6a02\u89c0\u9396\u548c\u60b2\u89c0\u9396"},"content":{"rendered":"<h1 id=\"%e5%a6%82%e4%bd%95%e4%bd%bf%e7%94%a8spring-data-jpa%e5%84%aa%e9%9b%85%e5%9c%b0%e5%af%a6%e7%8f%be%e6%a8%82%e8%a7%80%e9%8e%96%e5%92%8c%e6%82%b2%e8%a7%80%e9%8e%96-tcugtgXkyt\">\u5982\u4f55\u4f7f\u7528Spring Data JPA\u512a\u96c5\u5730\u5be6\u73fe\u6a02\u89c0\u9396\u548c\u60b2\u89c0\u9396<\/h1>\n<p>\u5728\u73fe\u4ee3\u7684\u61c9\u7528\u7a0b\u5f0f\u958b\u767c\u4e2d\uff0c\u6578\u64da\u4e00\u81f4\u6027\u662f\u81f3\u95dc\u91cd\u8981\u7684\u3002\u7576\u591a\u500b\u7528\u6236\u540c\u6642\u8a2a\u554f\u548c\u4fee\u6539\u6578\u64da\u6642\uff0c\u53ef\u80fd\u6703\u5c0e\u81f4\u6578\u64da\u4e0d\u4e00\u81f4\u7684\u554f\u984c\u3002\u70ba\u4e86\u89e3\u6c7a\u9019\u500b\u554f\u984c\uff0cSpring Data JPA\u63d0\u4f9b\u4e86\u5169\u7a2e\u9396\u5b9a\u6a5f\u5236\uff1a\u6a02\u89c0\u9396\u548c\u60b2\u89c0\u9396\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e\u5982\u4f55\u5728Spring Data JPA\u4e2d\u512a\u96c5\u5730\u5be6\u73fe\u9019\u5169\u7a2e\u9396\u5b9a\u6a5f\u5236\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af%e6%a8%82%e8%a7%80%e9%8e%96%e5%92%8c%e6%82%b2%e8%a7%80%e9%8e%96%ef%bc%9f-tcugtgXkyt\">\u4ec0\u9ebc\u662f\u6a02\u89c0\u9396\u548c\u60b2\u89c0\u9396\uff1f<\/h2>\n<p>\u5728\u8a0e\u8ad6\u5982\u4f55\u5be6\u73fe\u9019\u5169\u7a2e\u9396\u4e4b\u524d\uff0c\u6211\u5011\u9996\u5148\u9700\u8981\u4e86\u89e3\u5b83\u5011\u7684\u57fa\u672c\u6982\u5ff5\u3002<\/p>\n<ul>\n<li><strong>\u6a02\u89c0\u9396\uff1a<\/strong>\u6a02\u89c0\u9396\u5047\u8a2d\u591a\u500b\u4e8b\u52d9\u4e0d\u6703\u540c\u6642\u4fee\u6539\u540c\u4e00\u6578\u64da\uff0c\u56e0\u6b64\u5728\u66f4\u65b0\u6578\u64da\u6642\u4e0d\u6703\u7acb\u5373\u52a0\u9396\uff0c\u800c\u662f\u5728\u63d0\u4ea4\u6642\u6aa2\u67e5\u6578\u64da\u662f\u5426\u88ab\u5176\u4ed6\u4e8b\u52d9\u4fee\u6539\u3002\u9019\u901a\u5e38\u901a\u904e\u7248\u672c\u865f\u6216\u6642\u9593\u6233\u4f86\u5be6\u73fe\u3002<\/li>\n<li><strong>\u60b2\u89c0\u9396\uff1a<\/strong>\u60b2\u89c0\u9396\u5247\u5047\u8a2d\u6703\u6709\u885d\u7a81\uff0c\u56e0\u6b64\u5728\u8b80\u53d6\u6578\u64da\u6642\u5c31\u6703\u52a0\u9396\uff0c\u76f4\u5230\u4e8b\u52d9\u5b8c\u6210\u3002\u9019\u6a23\u53ef\u4ee5\u9632\u6b62\u5176\u4ed6\u4e8b\u52d9\u5c0d\u8a72\u6578\u64da\u7684\u4fee\u6539\uff0c\u78ba\u4fdd\u6578\u64da\u7684\u4e00\u81f4\u6027\u3002<\/li>\n<\/ul>\n<h2 id=\"%e5%9c%a8spring-data-jpa%e4%b8%ad%e5%af%a6%e7%8f%be%e6%a8%82%e8%a7%80%e9%8e%96-tcugtgXkyt\">\u5728Spring Data JPA\u4e2d\u5be6\u73fe\u6a02\u89c0\u9396<\/h2>\n<p>\u8981\u5728Spring Data JPA\u4e2d\u5be6\u73fe\u6a02\u89c0\u9396\uff0c\u6211\u5011\u53ef\u4ee5\u4f7f\u7528@Version\u8a3b\u89e3\u3002\u9019\u500b\u8a3b\u89e3\u6703\u81ea\u52d5\u7ba1\u7406\u7248\u672c\u865f\uff0c\u4e26\u5728\u66f4\u65b0\u6642\u9032\u884c\u6aa2\u67e5\u3002<\/p>\n<pre><code>\nimport javax.persistence.Entity;\nimport javax.persistence.Id;\nimport javax.persistence.Version;\n\n@Entity\npublic class Product {\n    @Id\n    private Long id;\n    \n    private String name;\n    \n    private Double price;\n    \n    @Version\n    private Long version;\n\n    \/\/ getters and setters\n}\n<\/code><\/pre>\n<p>\u5728\u4e0a\u9762\u7684\u4f8b\u5b50\u4e2d\uff0cProduct\u985e\u5305\u542b\u4e00\u500b\u7248\u672c\u865f\u5c6c\u6027\u3002\u7576\u6211\u5011\u5617\u8a66\u66f4\u65b0\u4e00\u500bProduct\u5be6\u9ad4\u6642\uff0cSpring Data JPA\u6703\u81ea\u52d5\u6aa2\u67e5\u7248\u672c\u865f\u3002\u5982\u679c\u7248\u672c\u865f\u4e0d\u5339\u914d\uff0c\u5247\u6703\u62cb\u51faOptimisticLockException\uff0c\u9019\u6a23\u6211\u5011\u5c31\u53ef\u4ee5\u6355\u7372\u9019\u500b\u7570\u5e38\u4e26\u9032\u884c\u76f8\u61c9\u7684\u8655\u7406\u3002<\/p>\n<h3 id=\"%e4%bd%bf%e7%94%a8%e6%a8%82%e8%a7%80%e9%8e%96%e7%9a%84%e7%af%84%e4%be%8b-tcugtgXkyt\">\u4f7f\u7528\u6a02\u89c0\u9396\u7684\u7bc4\u4f8b<\/h3>\n<pre><code>\nimport org.springframework.beans.factory.annotation.Autowired;\nimport org.springframework.stereotype.Service;\nimport org.springframework.transaction.annotation.Transactional;\n\n@Service\npublic class ProductService {\n    \n    @Autowired\n    private ProductRepository productRepository;\n\n    @Transactional\n    public void updateProduct(Long id, String newName, Double newPrice) {\n        Product product = productRepository.findById(id).orElseThrow(() -&gt; new RuntimeException(\"Product not found\"));\n        product.setName(newName);\n        product.setPrice(newPrice);\n        productRepository.save(product);\n    }\n}\n<\/code><\/pre>\n<h2 id=\"%e5%9c%a8spring-data-jpa%e4%b8%ad%e5%af%a6%e7%8f%be%e6%82%b2%e8%a7%80%e9%8e%96-tcugtgXkyt\">\u5728Spring Data JPA\u4e2d\u5be6\u73fe\u60b2\u89c0\u9396<\/h2>\n<p>\u8981\u5be6\u73fe\u60b2\u89c0\u9396\uff0c\u6211\u5011\u53ef\u4ee5\u4f7f\u7528@Lock\u8a3b\u89e3\u4f86\u6307\u5b9a\u9396\u7684\u985e\u578b\u3002Spring Data JPA\u652f\u6301\u591a\u7a2e\u9396\u5b9a\u6a21\u5f0f\uff0c\u5305\u62ecPESSIMISTIC_READ\u548cPESSIMISTIC_WRITE\u3002<\/p>\n<pre><code>\nimport org.springframework.data.jpa.repository.Lock;\nimport org.springframework.data.repository.CrudRepository;\nimport org.springframework.stereotype.Repository;\n\nimport javax.persistence.LockModeType;\n\n@Repository\npublic interface ProductRepository extends CrudRepository {\n    \n    @Lock(LockModeType.PESSIMISTIC_WRITE)\n    Product findById(Long id);\n}\n<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u7576\u6211\u5011\u8abf\u7528findById\u65b9\u6cd5\u6642\uff0c\u5c07\u6703\u5c0d\u8a72Product\u5be6\u9ad4\u52a0\u4e0a\u60b2\u89c0\u5beb\u9396\uff0c\u9019\u6a23\u5176\u4ed6\u4e8b\u52d9\u5728\u6b64\u671f\u9593\u7121\u6cd5\u4fee\u6539\u8a72\u5be6\u9ad4\u3002<\/p>\n<h3 id=\"%e4%bd%bf%e7%94%a8%e6%82%b2%e8%a7%80%e9%8e%96%e7%9a%84%e7%af%84%e4%be%8b-tcugtgXkyt\">\u4f7f\u7528\u60b2\u89c0\u9396\u7684\u7bc4\u4f8b<\/h3>\n<pre><code>\nimport org.springframework.beans.factory.annotation.Autowired;\nimport org.springframework.stereotype.Service;\nimport org.springframework.transaction.annotation.Transactional;\n\n@Service\npublic class ProductService {\n    \n    @Autowired\n    private ProductRepository productRepository;\n\n    @Transactional\n    public void updateProduct(Long id, String newName, Double newPrice) {\n        Product product = productRepository.findById(id);\n        product.setName(newName);\n        product.setPrice(newPrice);\n        productRepository.save(product);\n    }\n}\n<\/code><\/pre>\n<h2 id=\"%e7%b8%bd%e7%b5%90-tcugtgXkyt\">\u7e3d\u7d50<\/h2>\n<p>\u5728Spring Data JPA\u4e2d\uff0c\u6a02\u89c0\u9396\u548c\u60b2\u89c0\u9396\u662f\u78ba\u4fdd\u6578\u64da\u4e00\u81f4\u6027\u7684\u6709\u6548\u5de5\u5177\u3002\u6a02\u89c0\u9396\u9069\u5408\u65bc\u885d\u7a81\u8f03\u5c11\u7684\u5834\u666f\uff0c\u800c\u60b2\u89c0\u9396\u5247\u9069\u5408\u65bc\u9ad8\u885d\u7a81\u7684\u74b0\u5883\u3002\u6839\u64da\u5177\u9ad4\u7684\u696d\u52d9\u9700\u6c42\u9078\u64c7\u5408\u9069\u7684\u9396\u5b9a\u7b56\u7565\uff0c\u53ef\u4ee5\u6709\u6548\u63d0\u9ad8\u61c9\u7528\u7a0b\u5f0f\u7684\u7a69\u5b9a\u6027\u548c\u6027\u80fd\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\uff0c\u6eff\u8db3\u60a8\u7684\u9700\u6c42\u3002\u7121\u8ad6\u662f <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u9084\u662f\u5176\u4ed6\u985e\u578b\u7684 <a href=\"https:\/\/server.hk\">\u4f3a\u670d\u5668<\/a>\uff0c\u6211\u5011\u90fd\u80fd\u70ba\u60a8\u63d0\u4f9b\u7a69\u5b9a\u7684\u670d\u52d9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5b78\u7fd2\u5982\u4f55\u4f7f\u7528Spring Data JPA\u512a\u96c5\u5730\u5be6\u73fe\u6a02\u89c0\u9396\u548c\u60b2\u89c0\u9396\uff0c\u63d0\u5347\u6578\u64da\u4e00\u81f4\u6027\u8207\u61c9\u7528\u6027\u80fd\u3002<\/p>\n","protected":false},"author":0,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-175395","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/175395","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=175395"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/175395\/revisions"}],"predecessor-version":[{"id":175396,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/175395\/revisions\/175396"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=175395"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=175395"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=175395"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}