{"id":40286,"date":"2023-12-04T21:08:39","date_gmt":"2023-11-25T18:06:03","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%b0%9d%e8%af%95%e4%bd%bf%e7%94%a8spring-boot-jpa%e3%80%82\/"},"modified":"2024-05-04T12:09:03","modified_gmt":"2024-05-04T04:09:03","slug":"%e5%b0%9d%e8%af%95%e4%bd%bf%e7%94%a8spring-boot-jpa%e3%80%82","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/%e5%b0%9d%e8%af%95%e4%bd%bf%e7%94%a8spring-boot-jpa%e3%80%82\/","title":{"rendered":"\u5c1d\u8bd5\u4f7f\u7528Spring Boot JPA"},"content":{"rendered":"

JPA\uff08Spring Data JPA\uff09\u662f\u4ec0\u4e48\uff1f<\/h2>\n

\u6982\u62ec\u800c\u8a00\uff0c\u8fd9\u662f\u7528\u4e8e\u521b\u5efa\u80fd\u591f\u8bbf\u95ee\u6570\u636e\u5e93\u7684\u5e94\u7528\u7a0b\u5e8f\u7684Spring Boot\u5de5\u5177\u3002<\/p>\n

\u6839\u636eSpringBoot\u5b98\u65b9\u7f51\u7ad9\u4e0a\u7684\u300c\u4f7f\u7528JPA\u8fdb\u884c\u6570\u636e\u8bbf\u95ee\uff08\u82f1\u6587\u6587\u7ae0\uff09\u300d\uff0c\u6211\u81ea\u5df1\u67e5\u627e\u5e76\u7406\u89e3\u4e86\u5176\u4e2d\u7684\u5185\u5bb9\uff0c\u7136\u540e\u5199\u4e0b\u6765\u3002<\/p>\n

\u6267\u884c\u73af\u5883<\/h2>\n

\u2022 \u6e29\u99a8\u63d0\u793a\uff1a\u4e3a\u4e86\u6784\u5efaJava\u7a0b\u5e8f\uff0c\u9700\u8981\u4f7f\u7528\u4e00\u4e2a\u540d\u4e3aMaven\u7684\u5de5\u5177\uff0c\u8bf7\u786e\u4fdd\u5df2\u7ecf\u5b89\u88c5\u597d\u4e86\uff0c\u82e5\u5c1a\u672a\u5b89\u88c5\u8bf7\u8fdb\u884c\u5b89\u88c5\u3002<\/p>\n

(Translation:
\n\u2022 Friendly reminder: In order to build Java programs, you will need to use a tool called Maven. Please ensure that it is already installed, and if not, please proceed with the installation.)<\/p>\n

\u9a6c\u4e0a\u5f00\u59cb\u5427<\/h2>\n

\u9996\u5148\uff0c\u6211\u4eec\u4e0b\u8f7dSpringBoot\u3002
\n\u8ba9\u6211\u4eec\u6253\u5f00Spring Initializr\u3002<\/p>\n

\"\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8<\/div>\n

\u6211\u5c06\u4f7f\u7528\u8fd9\u4e2a\u5185\u5bb9\u6765\u521b\u5efa\u3002
\n\u70b9\u51fb\u53f3\u4fa7\u7684Dependencies\uff08\u4f9d\u8d56\u5173\u7cfb\uff09\u9009\u9879\u5361\uff0c\u6dfb\u52a0\u201cSpring Data JPA\u201d\u548c\u201cH2 Database\u201d\uff0c\u7136\u540e\u901a\u8fc7GENERATE\u6765\u521b\u5efa\u5e94\u7528\u7a0b\u5e8f\u3002<\/p>\n

\u6211\u4f1a\u5728VSCode\u6216\u4efb\u4f55\u5176\u4ed6\u7f16\u8f91\u5668\u4e2d\u6253\u5f00\u521b\u5efa\u7684\u5e94\u7528\u7a0b\u5e8f\u3002<\/p>\n

\u6211\u4f1a\u68c0\u67e5pom\u6587\u4ef6\u3002pom\u6587\u4ef6\u662f\u4e00\u4e2a\u8bb0\u5f55\u5e94\u7528\u7a0b\u5e8f\u6240\u4f7f\u7528\u7684\u5404\u79cd\u529f\u80fd\u4f9d\u8d56\u5173\u7cfb\u7684\u6587\u4ef6\u3002
\n\u5982\u679c\u6309\u7167\u6b65\u9aa4\u521b\u5efa\uff0c\u5e94\u8be5\u5177\u6709\u4ee5\u4e0b\u5185\u5bb9\u3002<\/p>\n

<?xml version=\"1.0\" encoding=\"UTF-8\"?>\r\n<project xmlns=\"http:\/\/maven.apache.org\/POM\/4.0.0\" xmlns:xsi=\"http:\/\/www.w3.org\/2001\/XMLSchema-instance\"\r\n    xsi:schemaLocation=\"http:\/\/maven.apache.org\/POM\/4.0.0 https:\/\/maven.apache.org\/xsd\/maven-4.0.0.xsd\">\r\n    <modelVersion>4.0.0<\/modelVersion>\r\n    <parent>\r\n        <groupId>org.springframework.boot<\/groupId>\r\n        <artifactId>spring-boot-starter-parent<\/artifactId>\r\n        <version>2.2.2.RELEASE<\/version>\r\n        <relativePath\/> <!-- lookup parent from repository -->\r\n    <\/parent>\r\n    <groupId>com.example<\/groupId>\r\n    <artifactId>accessing-data-jpa<\/artifactId>\r\n    <version>0.0.1-SNAPSHOT<\/version>\r\n    <name>accessing-data-jpa<\/name>\r\n    <description>Demo project for Spring Boot<\/description>\r\n\r\n    <properties>\r\n        <java.version>1.8<\/java.version>\r\n    <\/properties>\r\n\r\n    <dependencies>\r\n        <dependency>\r\n            <groupId>org.springframework.boot<\/groupId>\r\n            <artifactId>spring-boot-starter-data-jpa<\/artifactId>\r\n        <\/dependency>\r\n\r\n        <dependency>\r\n            <groupId>com.h2database<\/groupId>\r\n            <artifactId>h2<\/artifactId>\r\n            <scope>runtime<\/scope>\r\n        <\/dependency>\r\n        <dependency>\r\n            <groupId>org.springframework.boot<\/groupId>\r\n            <artifactId>spring-boot-starter-test<\/artifactId>\r\n            <scope>test<\/scope>\r\n            <exclusions>\r\n                <exclusion>\r\n                    <groupId>org.junit.vintage<\/groupId>\r\n                    <artifactId>junit-vintage-engine<\/artifactId>\r\n                <\/exclusion>\r\n            <\/exclusions>\r\n        <\/dependency>\r\n    <\/dependencies>\r\n\r\n    <build>\r\n        <plugins>\r\n            <plugin>\r\n                <groupId>org.springframework.boot<\/groupId>\r\n                <artifactId>spring-boot-maven-plugin<\/artifactId>\r\n            <\/plugin>\r\n        <\/plugins>\r\n    <\/build>\r\n\r\n<\/project>\r\n<\/code><\/pre>\n
\u8bfe\u5802\u7684\u5b9a\u4e49<\/h3>\n
\u5728\u8fd9\u4e2a\u5e94\u7528\u7a0b\u5e8f\u4e2d\uff0c\u6211\u4eec\u5c06\u628a\u987e\u5ba2\u4fe1\u606f\u6ce8\u518c\u5230\u6570\u636e\u5e93\u4e2d\uff0c\u5e76\u5c06\u7b26\u5408\u6761\u4ef6\u7684\u987e\u5ba2\u4fe1\u606f\u8f93\u51fa\u5230\u63a7\u5236\u53f0\u3002
\n\u9996\u5148\uff0c\u8ba9\u6211\u4eec\u521b\u5efa\u4e00\u4e2a\u540d\u4e3aCustomer\u7684\u7c7b\u3002\u6211\u4eec\u5c06\u6dfb\u52a0Customer.java\u6587\u4ef6\u3002\uff08src\/main\/java\/com\/example\/accessingdatajpa\/Customer.java\uff09<\/p>\n
package<\/span> com.example.accessingdatajpa<\/span>;<\/span>\r\n\r\nimport<\/span> javax.persistence.Entity<\/span>;<\/span>\r\nimport<\/span> javax.persistence.GeneratedValue<\/span>;<\/span>\r\nimport<\/span> javax.persistence.GenerationType<\/span>;<\/span>\r\nimport<\/span> javax.persistence.Id<\/span>;<\/span>\r\n\r\n@Entity<\/span>\r\npublic<\/span> class<\/span> Customer<\/span> {<\/span>\r\n\r\n  @Id<\/span>\r\n  @GeneratedValue<\/span>(<\/span>strategy<\/span>=<\/span>GenerationType<\/span>.<\/span>AUTO<\/span>)<\/span>\r\n  private<\/span> Long<\/span> id<\/span>;<\/span>\r\n  private<\/span> String<\/span> firstName<\/span>;<\/span>\r\n  private<\/span> String<\/span> lastName<\/span>;<\/span>\r\n\r\n\u3000<\/span>\/\/JPA\u306e\u305f\u3081\u306e\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3002\u4f7f\u3046\u3053\u3068\u306f\u306a\u3044\u305f\u3081protected\u3092\u6307\u5b9a\u3002<\/span>\r\n  protected<\/span> Customer<\/span>()<\/span> {}<\/span>\r\n\r\n\u3000<\/span>\/\/\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306b\u4fdd\u5b58\u3059\u308b Customer \u306e\u30a4\u30f3\u30b9\u30bf\u30f3\u30b9\u3092\u4f5c\u6210\u3059\u308b\u305f\u3081\u306e\u30b3\u30f3\u30b9\u30c8\u30e9\u30af\u30bf\u3002<\/span>\r\n  public<\/span> Customer<\/span>(<\/span>String<\/span> firstName<\/span>,<\/span> String<\/span> lastName<\/span>)<\/span> {<\/span>\r\n    this<\/span>.<\/span>firstName<\/span> =<\/span> firstName<\/span>;<\/span>\r\n    this<\/span>.<\/span>lastName<\/span> =<\/span> lastName<\/span>;<\/span>\r\n  }<\/span>\r\n\r\n  @Override<\/span>\r\n  public<\/span> String<\/span> toString<\/span>()<\/span> {<\/span>\r\n    return<\/span> String<\/span>.<\/span>format<\/span>(<\/span>\r\n        \"Customer[id=%d, firstName='%s', lastName='%s']\"<\/span>,<\/span>\r\n        id<\/span>,<\/span> firstName<\/span>,<\/span> lastName<\/span>);<\/span>\r\n  }<\/span>\r\n\r\n  public<\/span> Long<\/span> getId<\/span>()<\/span> {<\/span>\r\n    return<\/span> id<\/span>;<\/span>\r\n  }<\/span>\r\n\r\n  public<\/span> String<\/span> getFirstName<\/span>()<\/span> {<\/span>\r\n    return<\/span> firstName<\/span>;<\/span>\r\n  }<\/span>\r\n\r\n  public<\/span> String<\/span> getLastName<\/span>()<\/span> {<\/span>\r\n    return<\/span> lastName<\/span>;<\/span>\r\n  }<\/span>\r\n}<\/span>\r\n<\/code><\/pre>\n
\u6211\u4eec\u521b\u9020\u4e86\u4e00\u4e2a\u540d\u4e3aCustomer\u7684\u7c7b\uff0c\u5b83\u5177\u6709id\u3001firstName\u548cLastName\u8fd9\u4e09\u4e2a\u5c5e\u6027\u3002<\/p>\n
\uff20Entity
\nCustomer\u7c7b\u88ab\u6807\u8bb0\u4e3a@Entity\u6ce8\u89e3\u3002
\n@Entity\u662f\u4e3a\u4e86\u5c06\u6570\u636e\u5b58\u5165\u6570\u636e\u5e93\uff0c\u8fd9\u91cc\u662f\u4e0eCustomer\u8868\u76f8\u5173\u8054\u7684\u610f\u601d\u3002
\n“Entity”\u4e00\u8bcd\u4f3c\u4e4e\u5177\u6709\u5b9e\u9645\u5b58\u5728\u3001\u5b58\u5728\u3001\u5b9e\u4f53\u3001\u4e3b\u4f53\u7b49\u542b\u4e49\u3002<\/p>\n
\u987e\u5ba2\u5bf9\u8c61\u7684id\u5c5e\u6027\u5c06\u5e26\u6709@Id\uff0c\u4ee5\u4f7fJPA\u80fd\u591f\u8bc6\u522b\u5b83\u4f5c\u4e3a\u5bf9\u8c61\u7684ID\u3002<\/p>\n
.@GeneratedValue
\nid\u5c5e\u6027\u4e0a\u6709\u4e00\u4e2a\u540d\u4e3a@GeneratedValue\u7684\u6ce8\u89e3\u3002
\n\u5b83\u4f1a\u81ea\u52a8\u751f\u6210id\u3002<\/p>\n
toString() \u65b9\u6cd5\u4f1a\u8f93\u51fa\u5ba2\u6237\u4fe1\u606f\u3002<\/p>\n
\u521b\u5efa\u5b58\u50a8\u5e93\u3002<\/h3>\n
\u4e0b\u4e00\u6b65\uff0c\u6211\u4eec\u5c06\u521b\u5efa\u4e00\u4e2a\u540d\u4e3aCustomerRepository.java\u7684\u6587\u4ef6\u6765\u8bb0\u5f55\u5ba2\u6237\u4fe1\u606f\u3002\uff08\u6587\u4ef6\u8def\u5f84\u4e3a Customersrc\/main\/java\/com\/example\/accessingdatajpa\/CustomerRepository.java\uff09<\/p>\n
package<\/span> com.example.accessingdatajpa<\/span>;<\/span>\r\n\r\nimport<\/span> java.util.List<\/span>;<\/span>\r\n\r\nimport<\/span> org.springframework.data.repository.CrudRepository<\/span>;<\/span>\r\n\r\npublic<\/span> interface<\/span> CustomerRepository<\/span> extends<\/span> CrudRepository<\/span><<\/span>Customer<\/span>,<\/span> Long<\/span>><\/span> {<\/span>\r\n\r\n  List<\/span><<\/span>Customer<\/span>><\/span> findByLastName<\/span>(<\/span>String<\/span> lastName<\/span>);<\/span>\r\n\r\n  Customer<\/span> findById<\/span>(<\/span>long<\/span> id<\/span>);<\/span>\r\n}<\/span>\r\n\r\n<\/code><\/pre>\n
CustomerRepository\u7ee7\u627f\u4e86CrudRepository\u7684\u63a5\u53e3\u3002
\nCrud\u662f\u7cfb\u7edf\u6240\u9700\u7684\u56db\u4e2a\u4e3b\u8981\u529f\u80fd\u7684\u7f29\u5199\uff0c\u5373\u201cCreate\uff08\u521b\u5efa\uff09\u201d\uff0c\u201cRead\uff08\u8bfb\u53d6\uff09\u201d\uff0c\u201cUpdate\uff08\u66f4\u65b0\uff09\u201d\uff0c\u201cDelete\uff08\u5220\u9664\uff09\u201d\u3002\u56e0\u6b64\uff0cCrudRepository\u5177\u6709\u8fd9\u4e9b\u529f\u80fd\uff0c\u5c06CrudRepository\u5f15\u5165CustomerRepository\u5c06\u4f7f\u5176\u53ef\u4ee5\u4f7f\u7528\u8fd9\u4e9b\u529f\u80fd\u3002<\/p>\n
\u521b\u5efa\u4e00\u4e2a\u5e94\u7528\u7a0b\u5e8f\u7c7b<\/h3>\n
\u5728\u5e94\u7528\u7a0b\u5e8f\u521b\u5efa\u65f6\uff0cInitializr\u4f1a\u5411\u521b\u5efa\u7684\u7c7b\u4e2d\u6dfb\u52a0\u5185\u5bb9\u3002
\n\uff08src\/main\/java\/com\/example\/accessingdatajpa\/AccessingDataJpaApplication.java\uff09<\/p>\n
\u8bf7\u7528\u4e2d\u6587\u539f\u751f\u5730\u8f6c\u8ff0\u4ee5\u4e0b\u5185\u5bb9\uff0c\u53ea\u9700\u8981\u63d0\u4f9b\u4e00\u79cd\u9009\u9879\uff1a
\n\u4ee5\u4e0b\u662f\u539f\u6587\u5185\u5bb9\u3002<\/p>\n
package<\/span> com.example.accessingdatajpa<\/span>;<\/span>\r\n\r\nimport<\/span> org.springframework.boot.SpringApplication<\/span>;<\/span>\r\nimport<\/span> org.springframework.boot.autoconfigure.SpringBootApplication<\/span>;<\/span>\r\n\r\n@SpringBootApplication<\/span>\r\npublic<\/span> class<\/span> AccessingDataJpaApplication<\/span> {<\/span>\r\n\r\n  public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[]<\/span> args<\/span>)<\/span> {<\/span>\r\n    SpringApplication<\/span>.<\/span>run<\/span>(<\/span>AccessingDataJpaApplication<\/span>.<\/span>class<\/span>,<\/span> args<\/span>);<\/span>\r\n  }<\/span>\r\n\r\n}<\/span>\r\n<\/code><\/pre>\n
\u4ee5\u4e0b\u662f\u6dfb\u52a0\u4e86\u5185\u5bb9\u7684\u7248\u672c<\/p>\n
package<\/span> com.example.accessingdatajpa<\/span>;<\/span>\r\n\r\nimport<\/span> org.slf4j.Logger<\/span>;<\/span>\r\nimport<\/span> org.slf4j.LoggerFactory<\/span>;<\/span>\r\nimport<\/span> org.springframework.boot.CommandLineRunner<\/span>;<\/span>\r\nimport<\/span> org.springframework.boot.SpringApplication<\/span>;<\/span>\r\nimport<\/span> org.springframework.boot.autoconfigure.SpringBootApplication<\/span>;<\/span>\r\nimport<\/span> org.springframework.context.annotation.Bean<\/span>;<\/span>\r\n\r\n@SpringBootApplication<\/span>\r\npublic<\/span> class<\/span> AccessingDataJpaApplication<\/span> {<\/span>\r\n\r\n  private<\/span> static<\/span> final<\/span> Logger<\/span> log<\/span> =<\/span> LoggerFactory<\/span>.<\/span>getLogger<\/span>(<\/span>AccessingDataJpaApplication<\/span>.<\/span>class<\/span>);<\/span>\r\n\r\n  public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[]<\/span> args<\/span>)<\/span> {<\/span>\r\n    SpringApplication<\/span>.<\/span>run<\/span>(<\/span>AccessingDataJpaApplication<\/span>.<\/span>class<\/span>);<\/span>\r\n  }<\/span>\r\n\r\n  @Bean<\/span>\r\n  public<\/span> CommandLineRunner<\/span> demo<\/span>(<\/span>CustomerRepository<\/span> repository<\/span>)<\/span> {<\/span>\r\n    return<\/span> (<\/span>args<\/span>)<\/span> -><\/span> {<\/span>\r\n      \/\/ save a few customers<\/span>\r\n      repository<\/span>.<\/span>save<\/span>(<\/span>new<\/span> Customer<\/span>(<\/span>\"Jack\"<\/span>,<\/span> \"Bauer\"<\/span>));<\/span>\r\n      repository<\/span>.<\/span>save<\/span>(<\/span>new<\/span> Customer<\/span>(<\/span>\"Chloe\"<\/span>,<\/span> \"O'Brian\"<\/span>));<\/span>\r\n      repository<\/span>.<\/span>save<\/span>(<\/span>new<\/span> Customer<\/span>(<\/span>\"Kim\"<\/span>,<\/span> \"Bauer\"<\/span>));<\/span>\r\n      repository<\/span>.<\/span>save<\/span>(<\/span>new<\/span> Customer<\/span>(<\/span>\"David\"<\/span>,<\/span> \"Palmer\"<\/span>));<\/span>\r\n      repository<\/span>.<\/span>save<\/span>(<\/span>new<\/span> Customer<\/span>(<\/span>\"Michelle\"<\/span>,<\/span> \"Dessler\"<\/span>));<\/span>\r\n\r\n      \/\/ fetch all customers<\/span>\r\n      log<\/span>.<\/span>info<\/span>(<\/span>\"Customers found with findAll():\"<\/span>);<\/span>\r\n      log<\/span>.<\/span>info<\/span>(<\/span>\"-------------------------------\"<\/span>);<\/span>\r\n      for<\/span> (<\/span>Customer<\/span> customer<\/span> :<\/span> repository<\/span>.<\/span>findAll<\/span>())<\/span> {<\/span>\r\n        log<\/span>.<\/span>info<\/span>(<\/span>customer<\/span>.<\/span>toString<\/span>());<\/span>\r\n      }<\/span>\r\n      log<\/span>.<\/span>info<\/span>(<\/span>\"\"<\/span>);<\/span>\r\n\r\n      \/\/ fetch an individual customer by ID<\/span>\r\n      Customer<\/span> customer<\/span> =<\/span> repository<\/span>.<\/span>findById<\/span>(<\/span>1L<\/span>);<\/span>\r\n      log<\/span>.<\/span>info<\/span>(<\/span>\"Customer found with findById(1L):\"<\/span>);<\/span>\r\n      log<\/span>.<\/span>info<\/span>(<\/span>\"--------------------------------\"<\/span>);<\/span>\r\n      log<\/span>.<\/span>info<\/span>(<\/span>customer<\/span>.<\/span>toString<\/span>());<\/span>\r\n      log<\/span>.<\/span>info<\/span>(<\/span>\"\"<\/span>);<\/span>\r\n\r\n      \/\/ fetch customers by last name<\/span>\r\n      log<\/span>.<\/span>info<\/span>(<\/span>\"Customer found with findByLastName('Bauer'):\"<\/span>);<\/span>\r\n      log<\/span>.<\/span>info<\/span>(<\/span>\"--------------------------------------------\"<\/span>);<\/span>\r\n      repository<\/span>.<\/span>findByLastName<\/span>(<\/span>\"Bauer\"<\/span>).<\/span>forEach<\/span>(<\/span>bauer<\/span> -><\/span> {<\/span>\r\n        log<\/span>.<\/span>info<\/span>(<\/span>bauer<\/span>.<\/span>toString<\/span>());<\/span>\r\n      });<\/span>\r\n      \/\/ for (Customer bauer : repository.findByLastName(\"Bauer\")) {<\/span>\r\n      \/\/  log.info(bauer.toString());<\/span>\r\n      \/\/ }<\/span>\r\n      log<\/span>.<\/span>info<\/span>(<\/span>\"\"<\/span>);<\/span>\r\n    };<\/span>\r\n  }<\/span>\r\n\r\n}<\/span>\r\n<\/code><\/pre>\n
@SpringBootApplication\u5305\u542b\u4ee5\u4e0b\u7684\u6ce8\u89e3\u3002<\/p>\n
@Configuration: \u5c06\u7c7b\u6807\u8bb0\u4e3a\u7528\u4e8e\u5e94\u7528\u7a0b\u5e8f\u4e0a\u4e0b\u6587\u7684Bean\u5b9a\u4e49\u6e90\u3002<\/p>\n
@EnableAutoConfiguration: \u5c06\u7c7b\u6807\u8bb0\u4e3a\u5e94\u7528\u7a0b\u5e8f\u4e0a\u4e0b\u6587\u7684Bean\u5b9a\u4e49\u6e90\u3002\u6839\u636e\u7c7b\u8def\u5f84\u8bbe\u7f6e\uff0c\u5176\u4ed6Bean\u548c\u5404\u79cd\u5c5e\u6027\u8bbe\u7f6e\uff0c\u6307\u793aSpring Boot\u5f00\u59cb\u6dfb\u52a0Bean\u3002\u4f8b\u5982\uff0c\u5982\u679c\u7c7b\u8def\u5f84\u4e0a\u5b58\u5728spring-webmvc\uff0c\u6b64\u6ce8\u89e3\u5c06\u6807\u8bb0\u5e94\u7528\u7a0b\u5e8f\u4e3aWeb\u5e94\u7528\u7a0b\u5e8f\uff0c\u5e76\u6fc0\u6d3b\u4e3b\u8981\u64cd\u4f5c\uff0c\u4f8b\u5982DispatcherServlet\u7684\u914d\u7f6e\u3002<\/p>\n
@ComponentScan: \u6307\u793aSpring\u5728\u5305\u5185\u67e5\u627e\u5176\u4ed6\u7ec4\u4ef6\u3001\u914d\u7f6e\u7b49\uff0c\u4ee5\u627e\u5230\u63a7\u5236\u5668\u3002<\/p><\/blockquote>\n
@Bean\u662f\u7528\u4e8e\u8fd4\u56de\u901a\u8fc7@Bean\u6ce8\u89e3\u7684\u65b9\u6cd5\u5b9e\u4f8b\u5316\u7684\u7c7b\u7684\u6ce8\u89e3\u3002
\n\u5bf9\u4e8e\u6dfb\u52a0@Component\u3001@Service\u3001@Repository\u3001@Controller\u6ce8\u89e3\u7684\u7c7b\uff0c\u5f53\u6dfb\u52a0\u8fd9\u4e9b\u6ce8\u89e3\u65f6\uff0c\u5b83\u4eec\u4f1a\u88ab\u81ea\u52a8\u6ce8\u518c\u4e3aBean\uff0c\u6240\u4ee5\u65e0\u9700\u6dfb\u52a0@Bean\u6ce8\u89e3\u3002<\/p>\n
\u4e3b()\u65b9\u6cd5\u542f\u52a8\u5e94\u7528\u7a0b\u5e8f\u3002<\/p>\n
logger\u662f\u7528\u6765\u5c06\u7ed3\u679c\u8f93\u51fa\u5230\u63a7\u5236\u53f0\u7684\u5de5\u5177\u3002
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\n\u6211\u4eec\u53ef\u4ee5\u5728AccessingDataJpaApplication\u7c7b\u4e2d\u6dfb\u52a0\u5185\u5bb9\u3002(src\/main\/java\/com\/example\/accessingdatajpa\/AccessingDataJpaApplication.java)\u3002<\/p>\n
\r\npackage<\/span> com.example.accessingdatajpa<\/span>;<\/span>\r\n\r\nimport<\/span> org.slf4j.Logger<\/span>;<\/span>\r\nimport<\/span> org.slf4j.LoggerFactory<\/span>;<\/span>\r\nimport<\/span> org.springframework.boot.CommandLineRunner<\/span>;<\/span>\r\nimport<\/span> org.springframework.boot.SpringApplication<\/span>;<\/span>\r\nimport<\/span> org.springframework.boot.autoconfigure.SpringBootApplication<\/span>;<\/span>\r\nimport<\/span> org.springframework.context.annotation.Bean<\/span>;<\/span>\r\n\r\n@SpringBootApplication<\/span>\r\npublic<\/span> class<\/span> AccessingDataJpaApplication<\/span> {<\/span>\r\n\r\n  \/\/log\u306bAccessingDataJpaApplication\u30af\u30e9\u30b9\u306b\u66f8\u304b\u308c\u305f\u5185\u5bb9\u3092\u51fa\u3059<\/span>\r\n  private<\/span> static<\/span> final<\/span> Logger<\/span> log<\/span> =<\/span> LoggerFactory<\/span>.<\/span>getLogger<\/span>(<\/span>AccessingDataJpaApplication<\/span>.<\/span>class<\/span>);<\/span>\r\n\r\n  \/\/SpringApplication\u3092\u8d77\u52d5\u3055\u305b\u308b<\/span>\r\n  public<\/span> static<\/span> void<\/span> main<\/span>(<\/span>String<\/span>[]<\/span> args<\/span>)<\/span> {<\/span>\r\n    SpringApplication<\/span>.<\/span>run<\/span>(<\/span>AccessingDataJpaApplication<\/span>.<\/span>class<\/span>);<\/span>\r\n  }<\/span>\r\n\r\n  @Bean<\/span>\r\n  public<\/span> CommandLineRunner<\/span> demo<\/span>(<\/span>CustomerRepository<\/span> repository<\/span>)<\/span> {<\/span>\r\n    return<\/span> (<\/span>args<\/span>)<\/span> -><\/span> {<\/span>\r\n      \/\/ \u9867\u5ba2\u60c5\u5831\u3092\u8a2d\u5b9a\u3059\u308b<\/span>\r\n      repository<\/span>.<\/span>save<\/span>(<\/span>new<\/span> Customer<\/span>(<\/span>\"Jack\"<\/span>,<\/span> \"Bauer\"<\/span>));<\/span>\r\n      repository<\/span>.<\/span>save<\/span>(<\/span>new<\/span> Customer<\/span>(<\/span>\"Chloe\"<\/span>,<\/span> \"O'Brian\"<\/span>));<\/span>\r\n      repository<\/span>.<\/span>save<\/span>(<\/span>new<\/span> Customer<\/span>(<\/span>\"Kim\"<\/span>,<\/span> \"Bauer\"<\/span>));<\/span>\r\n      repository<\/span>.<\/span>save<\/span>(<\/span>new<\/span> Customer<\/span>(<\/span>\"David\"<\/span>,<\/span> \"Palmer\"<\/span>));<\/span>\r\n      repository<\/span>.<\/span>save<\/span>(<\/span>new<\/span> Customer<\/span>(<\/span>\"Michelle\"<\/span>,<\/span> \"Dessler\"<\/span>));<\/span>\r\n\r\n      \/\/ \u5168\u3066\u306e\u9867\u5ba2\u60c5\u5831\u3092\u53d6\u308a\u51fa\u3059<\/span>\r\n      log<\/span>.<\/span>info<\/span>(<\/span>\"Customers found with findAll():\"<\/span>);<\/span>\r\n      log<\/span>.<\/span>info<\/span>(<\/span>\"-------------------------------\"<\/span>);<\/span>\r\n      for<\/span> (<\/span>Customer<\/span> customer<\/span> :<\/span> repository<\/span>.<\/span>findAll<\/span>())<\/span> {<\/span>\r\n        log<\/span>.<\/span>info<\/span>(<\/span>customer<\/span>.<\/span>toString<\/span>());<\/span>\r\n      }<\/span>\r\n      log<\/span>.<\/span>info<\/span>(<\/span>\"\"<\/span>);<\/span>\r\n\r\n      \/\/ \u4e00\u81f4\u3059\u308bID\u3092\u6301\u3063\u305f\u9867\u5ba2\u60c5\u5831\u3092\u53d6\u308a\u51fa\u3059<\/span>\r\n      Customer<\/span> customer<\/span> =<\/span> repository<\/span>.<\/span>findById<\/span>(<\/span>1L<\/span>);<\/span>\r\n      log<\/span>.<\/span>info<\/span>(<\/span>\"Customer found with findById(1L):\"<\/span>);<\/span>\r\n      log<\/span>.<\/span>info<\/span>(<\/span>\"--------------------------------\"<\/span>);<\/span>\r\n      log<\/span>.<\/span>info<\/span>(<\/span>customer<\/span>.<\/span>toString<\/span>());<\/span>\r\n      log<\/span>.<\/span>info<\/span>(<\/span>\"\"<\/span>);<\/span>\r\n\r\n      \/\/ \u4e00\u81f4\u3059\u308bLastName\u3092\u6301\u3063\u305f\u9867\u5ba2\u60c5\u5831\u3092\u53d6\u308a\u51fa\u3059<\/span>\r\n      log<\/span>.<\/span>info<\/span>(<\/span>\"Customer found with findByLastName('Bauer'):\"<\/span>);<\/span>\r\n      log<\/span>.<\/span>info<\/span>(<\/span>\"--------------------------------------------\"<\/span>);<\/span>\r\n      repository<\/span>.<\/span>findByLastName<\/span>(<\/span>\"Bauer\"<\/span>).<\/span>forEach<\/span>(<\/span>bauer<\/span> -><\/span> {<\/span>\r\n        log<\/span>.<\/span>info<\/span>(<\/span>bauer<\/span>.<\/span>toString<\/span>());<\/span>\r\n      });<\/span>\r\n      \/\/ for (Customer bauer : repository.findByLastName(\"Bauer\")) {<\/span>\r\n      \/\/  log.info(bauer.toString());<\/span>\r\n      \/\/ }<\/span>\r\n      log<\/span>.<\/span>info<\/span>(<\/span>\"\"<\/span>);<\/span>\r\n    };<\/span>\r\n  }<\/span>\r\n\r\n}<\/span>\r\n<\/code><\/pre>\n
\u8bd5\u7740\u53bb\u505a<\/h3>\n
\u5728\u7ec8\u7aef\u8f93\u5165.\/mvnw spring-boot:run\u5e76\u6267\u884c\u4e00\u4e0b\uff0c\u8fd9\u6837\u5e94\u8be5\u4f1a\u5f97\u5230\u4ee5\u4e0b\u7684\u6267\u884c\u7ed3\u679c\u3002<\/p>\n
\"\u30b9\u30af\u30ea\u30fc\u30f3\u30b7\u30e7\u30c3\u30c8<\/div>\n
\u5b8c\u6210<\/h2>\n
\u4f7f\u7528Spring Data JPA\uff0c\u6211\u4eec\u73b0\u5728\u53ef\u4ee5\u521b\u5efa\u4e00\u4e2a\u7b80\u5355\u7684\u5e94\u7528\u7a0b\u5e8f\u6765\u5c06\u5bf9\u8c61\u4fdd\u5b58\u5230\u6570\u636e\u5e93\u4e2d\uff0c\u6216\u8005\u4ece\u6570\u636e\u5e93\u4e2d\u68c0\u7d22\u6570\u636e\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
JPA\uff08Spring Data JPA\uff09\u662f\u4ec0\u4e48\uff1f \u6982\u62ec\u800c\u8a00\uff0c\u8fd9\u662f\u7528\u4e8e\u521b\u5efa\u80fd\u591f\u8bbf\u95ee\u6570\u636e\u5e93\u7684\u5e94\u7528\u7a0b\u5e8f\u7684Spring […]<\/p>\n","protected":false},"author":9,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-40286","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"\n\u5c1d\u8bd5\u4f7f\u7528Spring Boot JPA - Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/zh\/blog\/\u5c1d\u8bd5\u4f7f\u7528spring-boot-jpa\u3002\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u5c1d\u8bd5\u4f7f\u7528Spring Boot JPA\" \/>\n<meta property=\"og:description\" content=\"JPA\uff08Spring Data JPA\uff09\u662f\u4ec0\u4e48\uff1f \u6982\u62ec\u800c\u8a00\uff0c\u8fd9\u662f\u7528\u4e8e\u521b\u5efa\u80fd\u591f\u8bbf\u95ee\u6570\u636e\u5e93\u7684\u5e94\u7528\u7a0b\u5e8f\u7684Spring […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/zh\/blog\/\u5c1d\u8bd5\u4f7f\u7528spring-boot-jpa\u3002\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - 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