{"id":302613,"date":"2024-05-20T18:39:53","date_gmt":"2024-05-20T10:39:53","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/302613.html"},"modified":"2024-05-20T18:40:02","modified_gmt":"2024-05-20T10:40:02","slug":"%e5%a6%82%e4%bd%95%e5%9c%a8spring-jpa%e4%b8%ad%e4%bc%98%e9%9b%85%e7%9a%84%e5%8a%a8%e6%80%81%e6%8b%bc%e6%8e%a5sql","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/302613.html","title":{"rendered":"\u5982\u4f55\u5728spring jpa\u4e2d\u4f18\u96c5\u7684\u52a8\u6001\u62fc\u63a5sql"},"content":{"rendered":"

\"\u5982\u4f55\u5728spring<\/p>\n

\u5728Spring JPA\u4e2d\uff0c\u4f18\u96c5\u7684\u52a8\u6001\u62fc\u63a5SQL\u662f\u4e00\u4e2a\u80fd\u663e\u8457\u63d0\u5347\u5f00\u53d1\u6548\u7387\u548c\u4ee3\u7801\u53ef\u7ef4\u62a4\u6027\u7684\u6280\u5de7\u3002\u4e3b\u8981\u65b9\u6cd5\u5305\u62ec\u4f7f\u7528Criteria API<\/code>\u3001\u5229\u7528Querydsl<\/code>\u3001\u91c7\u7528Specification<\/code>\u7b49\u624b\u6bb5\u3002\u5176\u4e2d\uff0c\u5229\u7528Querydsl<\/code>\u7684\u65b9\u6cd5\u5c24\u5176\u503c\u5f97\u63a8\u8350\uff0c\u56e0\u4e3a\u5b83\u65e2\u80fd\u63d0\u4f9b\u7c7b\u578b\u5b89\u5168\u7684\u67e5\u8be2\u6784\u5efa\u65b9\u5f0f\uff0c\u53c8\u80fd\u901a\u8fc7\u5176\u4e30\u5bcc\u7684API\u652f\u6301\u590d\u6742\u67e5\u8be2\u7684\u9700\u6c42\u3002<\/p>\n<\/p>\n

\u4e00\u3001\u4f7f\u7528CRITERIA API<\/code><\/h3>\n<\/p>\n

Criteria API<\/code>\u662f\u4e00\u79cd\u7c7b\u578b\u5b89\u5168\u7684\u3001\u9762\u5411\u5bf9\u8c61\u7684\u67e5\u8be2\u8bed\u8a00\uff0c\u5b83\u5141\u8bb8\u6784\u5efa\u7ed3\u6784\u5316\u7684\u3001\u52a8\u6001\u7684\u67e5\u8be2\u8bed\u53e5\uff0c\u800c\u65e0\u9700\u62c5\u5fc3SQL\u6ce8\u5165\u7b49\u5b89\u5168\u95ee\u9898\u3002<\/p>\n<\/p>\n

    \n
  • \u57fa\u672c\u4f7f\u7528\u65b9\u6cd5<\/strong>\uff1a\u9996\u5148\uff0c\u9700\u8981\u901a\u8fc7EntityManager<\/code>\u7684getCriteriaBuilder()<\/code>\u65b9\u6cd5\u83b7\u53d6CriteriaBuilder<\/code>\u5b9e\u4f8b\uff0c\u8be5\u5b9e\u4f8b\u7528\u4e8e\u6784\u5efaCriteriaQuery<\/code>\u5bf9\u8c61\u3002\u63a5\u7740\uff0c\u901a\u8fc7\u5b9a\u4e49\u7684\u5b9e\u4f53\u7c7b\u521b\u5efa\u4e00\u4e2a\u6216\u591a\u4e2aRoot<\/code>\u5b9e\u4f8b\uff0c\u7528\u6765\u6307\u5b9a\u67e5\u8be2\u7684\u6839\u3002\u5728\u6b64\u57fa\u7840\u4e0a\uff0c\u53ef\u4ee5\u6dfb\u52a0\u6761\u4ef6\uff08Predicates\uff09\u5230CriteriaQuery<\/code>\u5bf9\u8c61\u6765\u6784\u5efa\u52a8\u6001\u7684\u67e5\u8be2\u6761\u4ef6\u3002<\/li>\n
  • \u4f18\u52bf\u4e0e\u5e94\u7528\u573a\u666f<\/strong>\uff1aCriteria API<\/code>\u7684\u4f18\u52bf\u5728\u4e8e\u5176\u5f3a\u5927\u7684\u7c7b\u578b\u5b89\u5168\u7279\u6027\u548c\u52a8\u6001\u67e5\u8be2\u80fd\u529b\uff0c\u5341\u5206\u9002\u5408\u5728\u9700\u8981\u6839\u636e\u4e0d\u540c\u6761\u4ef6\u7ec4\u5408\u8fdb\u884c\u590d\u6742\u67e5\u8be2\u7684\u573a\u666f\u4e2d\u4f7f\u7528\uff0c\u7279\u522b\u662f\u5728\u907f\u514d\u786c\u7f16\u7801SQL\u8bed\u53e5\u7684\u573a\u666f\u4e0b\u66f4\u662f\u4f18\u52bf\u663e\u8457\u3002<\/li>\n<\/ul>\n

    \u4e8c\u3001\u5229\u7528QUERYDSL<\/code><\/h3>\n<\/p>\n

    Querydsl<\/code>\u662f\u4e00\u4e2a\u5f3a\u5927\u7684\u7c7b\u578b\u5b89\u5168\u7684\u67e5\u8be2\u6846\u67b6\uff0c\u5b83\u63d0\u4f9b\u4e86\u4e00\u79cd\u8fd1\u4f3c\u4e8eSQL\u7684\u8bed\u6cd5\u6765\u6784\u5efa\u67e5\u8be2\uff0c\u800c\u4e14\u5b8c\u5168\u652f\u6301\u9762\u5411\u5bf9\u8c61\u7684\u65b9\u5f0f\uff0c\u6781\u5927\u7684\u589e\u5f3a\u4e86\u4ee3\u7801\u7684\u53ef\u8bfb\u6027\u548c\u53ef\u7ef4\u62a4\u6027\u3002<\/p>\n<\/p>\n

      \n
    • \u57fa\u672c\u4f7f\u7528\u65b9\u6cd5<\/strong>\uff1a\u8981\u5728Spring JPA\u9879\u76ee\u4e2d\u4f7f\u7528Querydsl<\/code>\uff0c\u9996\u5148\u9700\u8981\u6dfb\u52a0Querydsl<\/code>\u76f8\u5173\u4f9d\u8d56\u5230\u9879\u76ee\u4e2d\uff0c\u5e76\u901a\u8fc7Querydsl<\/code>\u6ce8\u89e3\u5904\u7406\u5668\u751f\u6210Q\u7c7b\u3002\u4e4b\u540e\uff0c\u53ef\u4ee5\u4f7f\u7528JPAQueryFactory<\/code>\u7ed3\u5408\u751f\u6210\u7684Q\u7c7b\u6784\u5efa\u67e5\u8be2\u3002<\/li>\n
    • \u4f18\u52bf\u4e0e\u5e94\u7528\u573a\u666f<\/strong>\uff1aQuerydsl<\/code>\u7684\u6700\u5927\u4f18\u52bf\u5728\u4e8e\u5176\u7b80\u6d01\u660e\u4e86\u7684API\u548c\u5bf9\u52a8\u6001\u67e5\u8be2\u7684\u5f3a\u5927\u652f\u6301\uff0c\u5c24\u5176\u9002\u5408\u90a3\u4e9b\u67e5\u8be2\u6761\u4ef6\u591a\u53d8\u3001\u9700\u6c42\u590d\u6742\u7684\u4e1a\u52a1\u573a\u666f\u3002\u5b83\u63d0\u4f9b\u4e86\u4e30\u5bcc\u7684\u65b9\u6cd5\u6765\u652f\u6301\u8fde\u8868\u67e5\u8be2\u3001\u5b50\u67e5\u8be2\u548c\u5404\u79cd\u590d\u6742\u7684\u67e5\u8be2\u64cd\u4f5c\uff0c\u6781\u5927\u63d0\u5347\u4e86\u5f00\u53d1\u6548\u7387\u3002<\/li>\n<\/ul>\n

      \u4e09\u3001\u91c7\u7528SPECIFICATION<\/code><\/h3>\n<\/p>\n

      Specification<\/code>\u5728Spring Data JPA\u4e2d\u88ab\u7528\u6765\u6784\u5efa\u52a8\u6001\u67e5\u8be2\uff0c\u5b83\u57fa\u4e8eCriteria API<\/code>\uff0c\u4f46\u63d0\u4f9b\u4e86\u4e00\u79cd\u66f4\u52a0\u9762\u5411\u5bf9\u8c61\u7684\u65b9\u5f0f\u6765\u6784\u5efa\u67e5\u8be2\u6761\u4ef6\uff0c\u4f7f\u5f97\u4ee3\u7801\u66f4\u52a0\u7b80\u6d01\u6613\u61c2\u3002<\/p>\n<\/p>\n

        \n
      • \u57fa\u672c\u4f7f\u7528\u65b9\u6cd5<\/strong>\uff1a\u5b9e\u73b0Specification<\/code>\u63a5\u53e3\uff0c\u5e76\u5728\u5176toPredicate<\/code>\u65b9\u6cd5\u4e2d\u6784\u5efa\u67e5\u8be2\u6761\u4ef6\u3002\u901a\u8fc7JpaSpecificationExecutor<\/code>\u63a5\u53e3\u7684\u65b9\u6cd5\uff0c\u5982findAll(Specification)<\/code>\uff0c\u6267\u884c\u6784\u5efa\u7684\u67e5\u8be2\u6761\u4ef6\u3002<\/li>\n
      • \u4f18\u52bf\u4e0e\u5e94\u7528\u573a\u666f<\/strong>\uff1aSpecification<\/code>\u7684\u4f18\u52bf\u5728\u4e8e\u5b83\u7ed3\u5408\u4e86Criteria API<\/code>\u7684\u5f3a\u5927\u80fd\u529b\u548cSpring Data JPA\u7684\u4fbf\u6377\u6027\uff0c\u5c24\u5176\u9002\u5408\u5728\u9700\u8981\u9891\u7e41\u6539\u53d8\u67e5\u8be2\u6761\u4ef6\u7684\u6570\u636e\u8bbf\u95ee\u5c42\u4ee3\u7801\u7f16\u5199\u4e2d\u3002\u5b83\u8ba9\u52a8\u6001\u67e5\u8be2\u7684\u5b9e\u73b0\u65b9\u5f0f\u66f4\u52a0\u4f18\u96c5\uff0c\u540c\u65f6\u8fd8\u80fd\u5f88\u597d\u5730\u652f\u6301\u5206\u9875\u548c\u6392\u5e8f\u3002<\/li>\n<\/ul>\n

        \u603b\u7ed3<\/h3>\n<\/p>\n

        \u5728Spring JPA\u4e2d\u4f18\u96c5\u5730\u52a8\u6001\u62fc\u63a5SQL\uff0c\u4e3b\u8981\u4f9d\u8d56\u4e8e\u7406\u89e3\u548c\u638c\u63e1Criteria API<\/code>\u3001Querydsl<\/code>\u3001Specification<\/code>\u7b49\u6280\u672f\u7684\u4f7f\u7528\u65b9\u6cd5\u3002\u5176\u4e2d\uff0cQuerydsl<\/code>\u7531\u4e8e\u5176\u5f3a\u5927\u7684\u7c7b\u578b\u5b89\u5168\u67e5\u8be2\u6784\u5efa\u80fd\u529b\u3001\u7b80\u6d01\u660e\u4e86\u7684API\uff0c\u4ee5\u53ca\u5bf9\u590d\u6742\u67e5\u8be2\u60c5\u666f\u7684\u826f\u597d\u652f\u6301\uff0c\u6210\u4e3a\u4e86\u4e00\u79cd\u5341\u5206\u63a8\u8350\u7684\u5b9e\u73b0\u65b9\u5f0f<\/strong>\u3002\u5f00\u53d1\u4eba\u5458\u53ef\u4ee5\u6839\u636e\u5177\u4f53\u7684\u9879\u76ee\u9700\u6c42\u548c\u4e2a\u4eba\u504f\u597d\uff0c\u9009\u62e9\u6700\u9002\u5408\u7684\u65b9\u6cd5\u6765\u5b9e\u73b0\u52a8\u6001SQL\u7684\u62fc\u63a5\uff0c\u4ece\u800c\u63d0\u5347\u4ee3\u7801\u8d28\u91cf\u548c\u5f00\u53d1\u6548\u7387\u3002<\/p>\n<\/p>\n

        \u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n

        1. \u5982\u4f55\u5728Spring JPA\u4e2d\u5b9e\u73b0\u52a8\u6001\u62fc\u63a5SQL\u67e5\u8be2\u6761\u4ef6\uff1f<\/strong>
        \n\u5728Spring JPA\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528Specification\u6765\u52a8\u6001\u62fc\u63a5SQL\u67e5\u8be2\u6761\u4ef6\u3002Specification\u5141\u8bb8\u60a8\u6839\u636e\u4e0d\u540c\u7684\u6761\u4ef6\u521b\u5efa\u52a8\u6001\u67e5\u8be2\uff0c\u7b80\u5316\u4e86\u4ee3\u7801\u7684\u7f16\u5199\u8fc7\u7a0b\u3002\u60a8\u53ef\u4ee5\u901a\u8fc7\u521b\u5efaSpecification\u7684\u5b9e\u73b0\u7c7b\uff0c\u91cd\u5199toPredicate\u65b9\u6cd5\uff0c\u5728\u8be5\u65b9\u6cd5\u4e2d\u6839\u636e\u4e0d\u540c\u7684\u6761\u4ef6\u62fc\u63a5\u67e5\u8be2\u6761\u4ef6\u3002\u7136\u540e\u53ef\u4ee5\u901a\u8fc7\u5728JpaRepository\u4e2d\u4f7f\u7528Specification\u8fdb\u884c\u67e5\u8be2\uff0c\u4ece\u800c\u5b9e\u73b0\u52a8\u6001\u62fc\u63a5SQL\u67e5\u8be2\u6761\u4ef6\u3002<\/p>\n

        2. \u5728Spring JPA\u4e2d\u5982\u4f55\u5b9e\u73b0\u52a8\u6001\u6392\u5e8f\u67e5\u8be2\u7ed3\u679c\uff1f<\/strong>
        \n\u5728Spring JPA\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528Sort\u5bf9\u8c61\u6765\u5b9e\u73b0\u52a8\u6001\u6392\u5e8f\u67e5\u8be2\u7ed3\u679c\u3002\u60a8\u53ef\u4ee5\u6839\u636e\u4e0d\u540c\u7684\u5b57\u6bb5\u548c\u6392\u5e8f\u65b9\u5f0f\u521b\u5efaSort\u5bf9\u8c61\uff0c\u5e76\u5c06\u5176\u4f5c\u4e3a\u53c2\u6570\u4f20\u9012\u7ed9JpaRepository\u7684findAll\u65b9\u6cd5\u3002\u5728\u6267\u884c\u67e5\u8be2\u65f6\uff0cJPA\u4f1a\u6839\u636eSort\u5bf9\u8c61\u4e2d\u7684\u6392\u5e8f\u89c4\u5219\u5bf9\u67e5\u8be2\u7ed3\u679c\u8fdb\u884c\u6392\u5e8f\uff0c\u4ece\u800c\u5b9e\u73b0\u52a8\u6001\u6392\u5e8f\u67e5\u8be2\u7ed3\u679c\u3002<\/p>\n

        3. \u5728Spring JPA\u4e2d\u5982\u4f55\u5b9e\u73b0\u5206\u9875\u67e5\u8be2\u5e76\u52a8\u6001\u62fc\u63a5SQL\u6761\u4ef6\uff1f<\/strong>
        \nSpring JPA\u63d0\u4f9b\u4e86Pageable\u63a5\u53e3\u6765\u5b9e\u73b0\u5206\u9875\u67e5\u8be2\u3002\u60a8\u53ef\u4ee5\u901a\u8fc7\u521b\u5efaPageable\u5bf9\u8c61\u5e76\u6307\u5b9a\u67e5\u8be2\u7684\u9875\u7801\u3001\u6bcf\u9875\u7684\u8bb0\u5f55\u6570\u4ee5\u53ca\u6392\u5e8f\u89c4\u5219\u6765\u5b9e\u73b0\u5206\u9875\u67e5\u8be2\u3002\u5728\u52a8\u6001\u62fc\u63a5SQL\u6761\u4ef6\u65b9\u9762\uff0c\u60a8\u53ef\u4ee5\u7ed3\u5408\u4f7f\u7528Specification\u548cPageable\u3002\u9996\u5148\u521b\u5efaSpecification\u7684\u5b9e\u73b0\u7c7b\uff0c\u5e76\u5728\u5176\u4e2d\u6839\u636e\u4e0d\u540c\u7684\u6761\u4ef6\u62fc\u63a5SQL\u67e5\u8be2\u6761\u4ef6\u3002\u7136\u540e\u5c06Specification\u5bf9\u8c61\u548cPageable\u5bf9\u8c61\u4f20\u9012\u7ed9JpaRepository\u7684findAll\u65b9\u6cd5\uff0cJPA\u4f1a\u81ea\u52a8\u6839\u636e\u5206\u9875\u53c2\u6570\u548c\u67e5\u8be2\u6761\u4ef6\u6267\u884c\u67e5\u8be2\uff0c\u5e76\u8fd4\u56de\u5206\u9875\u7ed3\u679c\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"\u5728Spring JPA\u4e2d\uff0c\u4f18\u96c5\u7684\u52a8\u6001\u62fc\u63a5SQL\u662f\u4e00\u4e2a\u80fd\u663e\u8457\u63d0\u5347\u5f00\u53d1\u6548\u7387\u548c\u4ee3\u7801\u53ef\u7ef4\u62a4\u6027\u7684\u6280\u5de7\u3002\u4e3b\u8981\u65b9\u6cd5\u5305\u62ec\u4f7f\u7528C […]","protected":false},"author":3,"featured_media":302624,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[37],"tags":[],"acf":[],"_links":{"self":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/302613"}],"collection":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/comments?post=302613"}],"version-history":[{"count":0,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/posts\/302613\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media\/302624"}],"wp:attachment":[{"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/media?parent=302613"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/categories?post=302613"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/docs.pingcode.com\/wp-json\/wp\/v2\/tags?post=302613"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}