{"id":879,"date":"2021-02-28T14:23:00","date_gmt":"2021-02-28T06:23:00","guid":{"rendered":"http:\/\/www.langmanezhuang.com\/index.php\/2021\/02\/28\/springboot%e9%9b%86%e6%88%90jpa\/"},"modified":"2021-02-28T14:23:00","modified_gmt":"2021-02-28T06:23:00","slug":"springboot%e9%9b%86%e6%88%90jpa","status":"publish","type":"post","link":"http:\/\/blog.langmanezhuang.com\/index.php\/2021\/02\/28\/springboot%e9%9b%86%e6%88%90jpa\/","title":{"rendered":"Springboot\u96c6\u6210JPA"},"content":{"rendered":"

1.Jpa\u7684\u4ecb\u7ecd\u4e0e\u4f7f\u7528<\/p>\n

 JPA(Java Persistence API)\u662fSun\u5b98\u65b9\u63d0\u51fa\u7684Java\u6301\u4e45\u5316\u89c4\u8303\u3002\u5b83\u4e3aJava\u5f00\u53d1\u4eba\u5458\u63d0\u4f9b\u4e86\u4e00\u79cd\u5bf9\u8c61\/\u5173\u8054\u6620\u5c04\u5de5\u5177\u6765\u7ba1\u7406Java\u5e94\u7528\u4e2d\u7684\u5173\u7cfb\u6570\u636e\u3002\u4ed6\u7684\u51fa\u73b0\u4e3b\u8981\u662f\u4e3a\u4e86\u7b80\u5316\u73b0\u6709\u7684\u6301\u4e45\u5316\u5f00\u53d1\u5de5\u4f5c\u548c\u6574\u5408ORM\u6280\u672f\uff0c\u7ed3\u675f\u73b0\u5728Hibernate\uff0cTopLink\uff0cJDO\u7b49ORM\u6846\u67b6\u5404\u81ea\u4e3a\u8425\u7684\u5c40\u9762\u3002\u503c\u5f97\u6ce8\u610f\u7684\u662f\uff0cJPA\u662f\u5728\u5145\u5206\u5438\u6536\u4e86\u73b0\u6709Hibernate\uff0cTopLink\uff0cJDO\u7b49ORM\u6846\u67b6\u7684\u57fa\u7840\u4e0a\u53d1\u5c55\u800c\u6765\u7684\uff0c\u5177\u6709\u6613\u4e8e\u4f7f\u7528\uff0c\u4f38\u7f29\u6027\u5f3a\u7b49\u4f18\u70b9\u3002\u4ece\u76ee\u524d\u7684\u5f00\u53d1\u793e\u533a\u7684\u53cd\u5e94\u4e0a\u770b\uff0cJPA\u53d7\u5230\u4e86\u6781\u5927\u7684\u652f\u6301\u548c\u8d5e\u626c<\/p>\n

\u6ce8\u610f:JPA\u662f\u4e00\u5957\u89c4\u8303\uff0c\u4e0d\u662f\u4e00\u5957\u4ea7\u54c1\uff0c\u90a3\u4e48\u50cfHibernate,TopLink,JDO\u4ed6\u4eec\u662f\u4e00\u5957\u4ea7\u54c1\uff0c\u5982\u679c\u8bf4\u8fd9\u4e9b\u4ea7\u54c1\u5b9e\u73b0\u4e86\u8fd9\u4e2aJPA\u89c4\u8303\uff0c\u90a3\u4e48\u6211\u4eec\u5c31\u53ef\u4ee5\u53eb\u4ed6\u4eec\u4e3aJPA\u7684\u5b9e\u73b0\u4ea7\u54c1\u3002<\/span><\/p>\n

Spring Data JPA \u662f Spring \u57fa\u4e8e ORM \u6846\u67b6\u3001JPA \u89c4\u8303\u7684\u57fa\u7840\u4e0a\u5c01\u88c5\u7684\u4e00\u5957JPA\u5e94\u7528\u6846\u67b6\uff0c\u53ef\u4f7f\u5f00\u53d1\u8005\u7528\u6781\u7b80\u7684\u4ee3\u7801\u5373\u53ef\u5b9e\u73b0\u5bf9\u6570\u636e\u7684\u8bbf\u95ee\u548c\u64cd\u4f5c\u3002\u5b83\u63d0\u4f9b\u4e86\u5305\u62ec\u589e\u5220\u6539\u67e5\u7b49\u5728\u5185\u7684\u5e38\u7528\u529f\u80fd\uff0c\u4e14\u6613\u4e8e\u6269\u5c55\uff01\u5b66\u4e60\u5e76\u4f7f\u7528 Spring Data JPA \u53ef\u4ee5\u6781\u5927\u63d0\u9ad8\u5f00\u53d1\u6548\u7387\uff01<\/p>\n

\u4f7f\u7528\u65f6\u9700\u8981\u7ee7\u627fJpaRepository<\/p>\n

2.JPA\u7684\u57fa\u672c\u67e5\u8be2—\u9ed8\u8ba4\u5b9e\u73b0<\/p>\n

 \"\"<\/p>\n

3.Springboot\u96c6\u6210JPA<\/p>\n

 <\/p>\n

 <\/p>\n

 <\/p>\n

  \u5f15\u5165\u4f9d\u8d56<\/p>\n

\n
 <!-- mysql\u9a71\u52a8 -->\n<dependency>\n    <groupId>mysql<\/groupId>\n    <artifactId>mysql-connector-java<\/artifactId>\n<\/dependency>\n  <!-- springdata jpa\u4f9d\u8d56 -->\n<dependency>\n    <groupId>org.springframework.boot<\/groupId>\n    <artifactId>spring-boot-starter-data-jpa<\/artifactId>\n<\/dependency>\n<\/pre>\n<\/div>\n
\u4fee\u6539\u914d\u7f6e\u6587\u4ef6<\/p>\n
\n
###\u6570\u636e\u6e90\u914d\u7f6e\n########################################################\nspring.datasource.url = jdbc:mysql:\/\/localhost:3306\/springboot\nspring.datasource.username = root\nspring.datasource.password = root\nspring.datasource.driverClassName = com.mysql.cj.jdbc.Driver\nspring.datasource.max-active=20\nspring.datasource.max-idle=8\nspring.datasource.min-idle=8\nspring.datasource.initial-size=10\n########################################################\n### \u6301\u4e45\u5316\u914d\u7f6e\n########################################################\n# Specify the DBMS\nspring.jpa.database = MYSQL\n# Show or not log for each sql query\nspring.jpa.show-sql = true\n# Hibernate ddl auto (create\u3001create-drop\u3001update\u3001validate\u3001none)\n#validate: \u5728\u6bcf\u6b21\u9879\u76ee\u542f\u52a8\u7684\u65f6\u5019\uff0c\u4f1a\u81ea\u52a8\u8fdb\u884c\u8868\u7ed3\u6784\u4e0e\u6211\u4eec\u7684\u5b9e\u4f53\u7c7b\u7684\u9a8c\u8bc1\uff0c\u5982\u679c\u8868\u7ed3\u6784\u4e0e\u5b9e\u4f53\u7c7b\u7684\u4ee3\u7801\u4e0d\u76f8\u7b26\uff0c\u5c31\u4f1a\u4ea7\u751f\u62a5\u9519\u3002\nspring.jpa.hibernate.ddl-auto = update\n# Naming strategy\n#[org.hibernate.cfg.ImprovedNamingStrategy              #org.hibernate.cfg.DefaultNamingStrategy]\nspring.jpa.hibernate.naming-strategy = org.hibernate.cfg.ImprovedNamingStrategy\n# stripped before adding them to the entity manager)\nspring.jpa.properties.hibernate.dialect = org.hibernate.dialect.MySQL5Dialect\n<\/pre>\n<\/div>\n
\u3000\u3000\u5176\u4e2d\uff0cspring.jpa.hibernate.ddl-auto \u53c2\u6570\u7528\u6765\u914d\u7f6e\u662f\u5426\u5f00\u542f\u81ea\u52a8\u66f4\u65b0\u6570\u636e\u5e93\u8868\u7ed3\u6784\uff0c\u53ef\u53d6create\u3001create-drop\u3001update\u3001validate\u3001none\u4e94\u4e2a\u503c\u3002 create \u6bcf\u6b21\u52a0\u8f7dhibernate\u65f6\uff0c\u5148\u5220\u9664\u5df2\u5b58\u5728\u7684\u6570\u636e\u5e93\u8868\u7ed3\u6784\u518d\u91cd\u65b0\u751f\u6210\uff1bcreate-drop \u6bcf\u6b21\u52a0\u8f7dhibernate\u65f6\uff0c\u5148\u5220\u9664\u5df2\u5b58\u5728\u7684\u6570\u636e\u5e93\u8868\u7ed3\u6784\u518d\u91cd\u65b0\u751f\u6210\uff0c\u5e76\u4e14\u5f53 sessionFactory\u5173\u95ed\u65f6\u81ea\u52a8\u5220\u9664\u751f\u6210\u7684\u6570\u636e\u5e93\u8868\u7ed3\u6784\uff1bupdate \u53ea\u5728\u7b2c\u4e00\u6b21\u52a0\u8f7dhibernate\u65f6\u81ea\u52a8\u751f\u6210\u6570\u636e\u5e93\u8868\u7ed3\u6784\uff0c\u4ee5\u540e\u518d\u6b21\u52a0\u8f7dhibernate\u65f6\u6839\u636emodel\u7c7b\u81ea\u52a8\u66f4\u65b0\u8868\u7ed3\u6784\uff1bvalidate \u6bcf\u6b21\u52a0\u8f7dhibernate\u65f6\uff0c\u9a8c\u8bc1\u6570\u636e\u5e93\u8868\u7ed3\u6784\uff0c\u53ea\u4f1a\u548c\u6570\u636e\u5e93\u4e2d\u7684\u8868\u8fdb\u884c\u6bd4\u8f83\uff0c\u4e0d\u4f1a\u521b\u5efa\u65b0\u8868\uff0c\u4f46\u662f\u4f1a\u63d2\u5165\u65b0\u503c\u3002none \u5173\u95ed\u81ea\u52a8\u66f4\u65b0<\/span> <\/p>\n
4.JPA\u7684\u57fa\u672c\u67e5\u8be2—\u65b9\u6cd5\u540d\u89e3\u6790<\/p>\n
\"\"<\/p>\n
 <\/p>\n
 <\/p>\n
 \"\"<\/p>\n
 <\/p>\n
 <\/p>\n
 5.JPA\u7684\u590d\u6742\u67e5\u8be2-\u5206\u9875\u67e5\u8be2<\/p>\n
\u5206\u9875\u67e5\u8be2\u5728\u5b9e\u9645\u4f7f\u7528\u4e2d\u975e\u5e38\u666e\u904d\u4e86\uff0cspring data jpa\u5df2\u7ecf\u5e2e\u6211\u4eec\u5b9e\u73b0\u4e86\u5206\u9875\u7684\u529f\u80fd\uff0c\u5728\u67e5\u8be2\u7684\u65b9\u6cd5\u4e2d\uff0c\u9700\u8981\u4f20\u5165\u53c2\u6570Pageable ,\u5f53\u67e5\u8be2\u4e2d\u6709\u591a\u4e2a\u53c2\u6570\u7684\u65f6\u5019Pageable\u5efa\u8bae\u505a\u4e3a\u6700\u540e\u4e00\u4e2a\u53c2\u6570\u4f20\u5165Pageable \u662fspring\u5c01\u88c5\u7684\u5206\u9875\u5b9e\u73b0\u7c7b\uff0c\u4f7f\u7528\u7684\u65f6\u5019\u9700\u8981\u4f20\u5165\u9875\u6570\u3001\u6bcf\u9875\u6761\u6570\u548c\u6392\u5e8f\u89c4\u5219<\/p>\n
\n
Page<User> findALL(Pageable pageable); \n\nPage<User> findByUserName(String userName,Pageable pageable);\n<\/pre>\n<\/div>\n
6.JPA\u7684\u590d\u6742\u67e5\u8be2-\u9650\u5236\u67e5\u8be2<\/p>\n
\u6709\u65f6\u5019\u6211\u4eec\u53ea\u9700\u8981\u67e5\u8be2\u524dN\u4e2a\u5143\u7d20\uff0c\u6216\u8005\u53ea\u53d6\u524d\u4e00\u4e2a\u5b9e\u4f53\u3002<\/p>\n
\n
User findFirstByOrderByAgeAsc();\n\nUser findTopByOrderByAgeDesc();\n\nList<User> findFirst10ByAge(Integer age, Sort sort);\n\nList<User> findTop10ByAge(Integer age, Pageable pageable);\n<\/pre>\n<\/div>\n
7.\u81ea\u5b9a\u4e49SQL\u67e5\u8be2<\/p>\n
\u5176\u5b9eSpring data \u89c9\u5927\u90e8\u5206\u7684SQL\u90fd\u53ef\u4ee5\u6839\u636e\u65b9\u6cd5\u540d\u5b9a\u4e49\u7684\u65b9\u5f0f\u6765\u5b9e\u73b0\uff0c\u4f46\u662f\u7531\u4e8e\u67d0\u4e9b\u539f\u56e0\u6211\u4eec\u60f3\u4f7f\u7528\u81ea\u5b9a\u4e49\u7684SQL\u6765\u67e5\u8be2\uff0cspring data\u4e5f\u662f\u5b8c\u7f8e\u652f\u6301\u7684\uff1b\u5728SQL\u7684\u67e5\u8be2\u65b9\u6cd5\u4e0a\u9762\u4f7f\u7528@Query\u6ce8\u89e3\uff0c\u5982\u6d89\u53ca\u5230\u5220\u9664\u548c\u4fee\u6539\u5728\u9700\u8981\u52a0\u4e0a@Modifying.\u4e5f\u53ef\u4ee5\u6839\u636e\u9700\u8981\u6dfb\u52a0 @Transactional \u5bf9\u4e8b\u7269\u7684\u652f\u6301\uff0c\u67e5\u8be2\u8d85\u65f6\u7684\u8bbe\u7f6e\u7b49<\/span><\/p>\n
\"\"<\/span><\/p>\n
 <\/p>\n
<\/span><\/p>\n
 <\/p>\n","protected":false},"excerpt":{"rendered":"
1.Jpa\u7684\u4ecb\u7ecd\u4e0e\u4f7f\u7528  JPA(Java Persistence API)\u662fSun\u5b98\u65b9\u63d0\u51fa\u7684Jav … \u7ee7\u7eed\u9605\u8bfb Springboot\u96c6\u6210JPA<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[1],"tags":[],"_links":{"self":[{"href":"http:\/\/blog.langmanezhuang.com\/index.php\/wp-json\/wp\/v2\/posts\/879"}],"collection":[{"href":"http:\/\/blog.langmanezhuang.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/blog.langmanezhuang.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/blog.langmanezhuang.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/blog.langmanezhuang.com\/index.php\/wp-json\/wp\/v2\/comments?post=879"}],"version-history":[{"count":0,"href":"http:\/\/blog.langmanezhuang.com\/index.php\/wp-json\/wp\/v2\/posts\/879\/revisions"}],"wp:attachment":[{"href":"http:\/\/blog.langmanezhuang.com\/index.php\/wp-json\/wp\/v2\/media?parent=879"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/blog.langmanezhuang.com\/index.php\/wp-json\/wp\/v2\/categories?post=879"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/blog.langmanezhuang.com\/index.php\/wp-json\/wp\/v2\/tags?post=879"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}