{"id":183766,"date":"2024-11-10T07:33:20","date_gmt":"2024-11-09T23:33:20","guid":{"rendered":"https:\/\/server.hk\/cnblog\/183766\/"},"modified":"2024-11-10T07:33:21","modified_gmt":"2024-11-09T23:33:21","slug":"%e4%bd%bf%e7%94%a8jpa%e4%b8%80%e9%8d%b5%e5%88%aa%e9%99%a4%e6%89%80%e6%9c%89%e6%95%b8%e6%93%9a%e5%ba%ab%e6%95%b8%e6%93%9a-jpa-%e5%88%aa%e9%99%a4%e6%89%80%e6%9c%89%e6%95%b8%e6%93%9a%e5%ba%ab","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/183766\/","title":{"rendered":"\u4f7f\u7528JPA\u4e00\u9375\u522a\u9664\u6240\u6709\u6578\u64da\u5eab\u6578\u64da (jpa \u522a\u9664\u6240\u6709\u6578\u64da\u5eab)"},"content":{"rendered":"<h1 id=\"%e4%bd%bf%e7%94%a8jpa%e4%b8%80%e9%8d%b5%e5%88%aa%e9%99%a4%e6%89%80%e6%9c%89%e6%95%b8%e6%93%9a%e5%ba%ab%e6%95%b8%e6%93%9a-jpa-%e5%88%aa%e9%99%a4%e6%89%80%e6%9c%89%e6%95%b8%e6%93%9a%e5%ba%ab-qLDsGtEDte\">\u4f7f\u7528JPA\u4e00\u9375\u522a\u9664\u6240\u6709\u6578\u64da\u5eab\u6578\u64da (JPA \u522a\u9664\u6240\u6709\u6578\u64da\u5eab)<\/h1>\n<p>\u5728\u958b\u767cJava\u61c9\u7528\u7a0b\u5e8f\u6642\uff0cJava Persistence API\uff08JPA\uff09\u662f\u4e00\u500b\u975e\u5e38\u91cd\u8981\u7684\u5de5\u5177\uff0c\u5b83\u63d0\u4f9b\u4e86\u4e00\u7a2e\u7c21\u55ae\u7684\u65b9\u5f0f\u4f86\u7ba1\u7406\u6578\u64da\u5eab\u4e2d\u7684\u6578\u64da\u3002\u7576\u9700\u8981\u6e05\u7a7a\u6578\u64da\u5eab\u4e2d\u7684\u6240\u6709\u6578\u64da\u6642\uff0cJPA\u63d0\u4f9b\u4e86\u5e7e\u7a2e\u65b9\u6cd5\u4f86\u5be6\u73fe\u9019\u4e00\u76ee\u6a19\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5982\u4f55\u4f7f\u7528JPA\u4e00\u9375\u522a\u9664\u6240\u6709\u6578\u64da\u5eab\u6578\u64da\uff0c\u4e26\u63d0\u4f9b\u76f8\u95dc\u7684\u4ee3\u78bc\u793a\u4f8b\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%afjpa%ef%bc%9f-qLDsGtEDte\">\u4ec0\u9ebc\u662fJPA\uff1f<\/h2>\n<p>Java Persistence 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id=\"%e4%bd%bf%e7%94%a8jpa%e5%88%aa%e9%99%a4%e6%89%80%e6%9c%89%e6%95%b8%e6%93%9a%e7%9a%84%e6%96%b9%e5%bc%8f-qLDsGtEDte\">\u4f7f\u7528JPA\u522a\u9664\u6240\u6709\u6578\u64da\u7684\u65b9\u5f0f<\/h2>\n<p>\u4f7f\u7528JPA\u522a\u9664\u6240\u6709\u6578\u64da\u7684\u6700\u7c21\u55ae\u65b9\u6cd5\u662f\u4f7f\u7528JPQL\uff08Java Persistence Query Language\uff09\u4f86\u57f7\u884c\u522a\u9664\u64cd\u4f5c\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u898b\u7684\u65b9\u6cd5\uff1a<\/p>\n<h3 id=\"%e6%96%b9%e6%b3%95%e4%b8%80%ef%bc%9a%e4%bd%bf%e7%94%a8jpql%e5%88%aa%e9%99%a4%e6%89%80%e6%9c%89%e6%95%b8%e6%93%9a-qLDsGtEDte\">\u65b9\u6cd5\u4e00\uff1a\u4f7f\u7528JPQL\u522a\u9664\u6240\u6709\u6578\u64da<\/h3>\n<pre><code>\nimport javax.persistence.EntityManager;\nimport javax.persistence.EntityTransaction;\n\npublic void deleteAllData(EntityManager entityManager) {\n    EntityTransaction transaction = entityManager.getTransaction();\n    try {\n        transaction.begin();\n        entityManager.createQuery(\"DELETE FROM YourEntityName\").executeUpdate();\n        transaction.commit();\n    } catch (Exception e) {\n        if (transaction.isActive()) {\n            transaction.rollback();\n        }\n        e.printStackTrace();\n    }\n}\n<\/code><\/pre>\n<p>\u5728\u9019\u6bb5\u4ee3\u78bc\u4e2d\uff0c\u6211\u5011\u9996\u5148\u7372\u53d6\u4e00\u500bEntityManager\u5be6\u4f8b\uff0c\u7136\u5f8c\u958b\u59cb\u4e00\u500b\u4e8b\u52d9\u3002\u63a5\u8457\uff0c\u6211\u5011\u4f7f\u7528JPQL\u8a9e\u53e5\u522a\u9664\u6307\u5b9a\u5be6\u9ad4\u7684\u6240\u6709\u6578\u64da\u3002\u6700\u5f8c\uff0c\u6839\u64da\u64cd\u4f5c\u7d50\u679c\u63d0\u4ea4\u6216\u56de\u6efe\u4e8b\u52d9\u3002<\/p>\n<h3 id=\"%e6%96%b9%e6%b3%95%e4%ba%8c%ef%bc%9a%e4%bd%bf%e7%94%a8spring-data-jpa%e7%9a%84repository-qLDsGtEDte\">\u65b9\u6cd5\u4e8c\uff1a\u4f7f\u7528Spring Data JPA\u7684Repository<\/h3>\n<p>\u5982\u679c\u60a8\u4f7f\u7528\u7684\u662fSpring Data JPA\uff0c\u5247\u53ef\u4ee5\u901a\u904e\u5b9a\u7fa9\u4e00\u500bRepository\u63a5\u53e3\u4f86\u7c21\u5316\u522a\u9664\u64cd\u4f5c\uff1a<\/p>\n<pre><code>\nimport org.springframework.data.jpa.repository.JpaRepository;\nimport org.springframework.stereotype.Repository;\n\n@Repository\npublic interface YourEntityRepository extends JpaRepository {\n    void deleteAll();\n}\n<\/code><\/pre>\n<p>\u7136\u5f8c\uff0c\u60a8\u53ef\u4ee5\u5728\u670d\u52d9\u5c64\u4e2d\u8abf\u7528\u9019\u500b\u65b9\u6cd5\uff1a<\/p>\n<pre><code>\nimport org.springframework.beans.factory.annotation.Autowired;\nimport org.springframework.stereotype.Service;\n\n@Service\npublic class YourEntityService {\n    @Autowired\n    private YourEntityRepository repository;\n\n    public void clearAllData() {\n        repository.deleteAll();\n    }\n}\n<\/code><\/pre>\n<h2 id=\"%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-qLDsGtEDte\">\u6ce8\u610f\u4e8b\u9805<\/h2>\n<p>\u5728\u522a\u9664\u6240\u6709\u6578\u64da\u4e4b\u524d\uff0c\u8acb\u52d9\u5fc5\u8003\u616e\u4ee5\u4e0b\u5e7e\u9ede\uff1a<\/p>\n<ul>\n<li>\u78ba\u4fdd\u60a8\u6709\u8db3\u5920\u7684\u6b0a\u9650\u4f86\u57f7\u884c\u522a\u9664\u64cd\u4f5c\u3002<\/li>\n<li>\u5728\u751f\u7522\u74b0\u5883\u4e2d\uff0c\u8acb\u8b39\u614e\u64cd\u4f5c\uff0c\u907f\u514d\u610f\u5916\u522a\u9664\u91cd\u8981\u6578\u64da\u3002<\/li>\n<li>\u8003\u616e\u5728\u522a\u9664\u4e4b\u524d\u5099\u4efd\u6578\u64da\uff0c\u4ee5\u9632\u9700\u8981\u6062\u5fa9\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-qLDsGtEDte\">\u7e3d\u7d50<\/h2>\n<p>\u4f7f\u7528JPA\u522a\u9664\u6240\u6709\u6578\u64da\u5eab\u6578\u64da\u662f\u4e00\u500b\u7c21\u55ae\u800c\u6709\u6548\u7684\u904e\u7a0b\u3002\u7121\u8ad6\u662f\u4f7f\u7528JPQL\u9084\u662fSpring Data JPA\uff0c\u958b\u767c\u8005\u90fd\u53ef\u4ee5\u8f15\u9b06\u5730\u5be6\u73fe\u9019\u4e00\u529f\u80fd\u3002\u5728\u9032\u884c\u6b64\u64cd\u4f5c\u6642\uff0c\u52d9\u5fc5\u8b39\u614e\uff0c\u4ee5\u514d\u9020\u6210\u6578\u64da\u4e1f\u5931\u3002\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u7a69\u5b9a\u7684 <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u89e3\u6c7a\u65b9\u6848\u4f86\u904b\u884c\u60a8\u7684\u61c9\u7528\u7a0b\u5e8f\uff0cServer.HK\u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\uff0c\u6eff\u8db3\u60a8\u7684\u9700\u6c42\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4f7f\u7528JPA\u4e00\u9375\u522a\u9664\u6240\u6709\u6578\u64da\u5eab\u6578\u64da\uff0c\u7c21\u5316\u6578\u64da\u7ba1\u7406\u6d41\u7a0b\uff0c\u5feb\u901f\u6e05\u7a7a\u6578\u64da\u5eab\uff0c\u63d0\u5347\u958b\u767c\u6548\u7387\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-183766","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/183766","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=183766"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/183766\/revisions"}],"predecessor-version":[{"id":183767,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/183766\/revisions\/183767"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=183766"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=183766"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=183766"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}