我现在搭建一个spring boot项目，需要连接oracle数据库，帮我搭建一个框架，包含实体类、mapper层 ，s

为了搭建一个Spring Boot项目来连接Oracle数据库，你需要以下步骤和代码示例。以下是各个层次的简单实现。 1. **实体类（Entity）** - 这是代表数据库表中一条记录的类。 ```java import javax.persistence.Entity; import javax.persistence.Id; import javax.persistence.Table; @Entity @Table(name = "YOUR_TABLE_NAME") public class YourEntity { @Id private Long id; private String columnName; // Getters and Setters public Long getId() { return id; } public void setId(Long id) { this.id = id; } public String getColumnName() { return columnName; } public void setColumnName(String columnName) { this.columnName = columnName; } } ``` 2. **Mapper层（Repository）** - 这是用于访问数据库的接口。 ```java import org.springframework.data.jpa.repository.JpaRepository; import org.springframework.stereotype.Repository; @Repository public interface YourEntityRepository extends JpaRepository { // Custom query methods if needed } ``` 3. **Service层** - 这是业务逻辑层，用于处理具体业务。 ```java import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Service; import java.util.List; @Service public class YourEntityService { @Autowired private YourEntityRepository repository; public List findAll() { return repository.findAll(); } public YourEntity findById(Long id) { return repository.findById(id).orElse(null); } public YourEntity save(YourEntity entity) { return repository.save(entity); } public void deleteById(Long id) { repository.deleteById(id); } } ``` 4. **Controller层** - 这是与前端交互的层，用于接收请求和处理响应。 ```java import org.springframework.beans.factory.annotation.Autowired; import org.springframework.http.ResponseEntity; import org.springframework.web.bind.annotation.*; import java.util.List; @RestController @RequestMapping("/your-entity") public class YourEntityController { @Autowired private YourEntityService service; @GetMapping public ResponseEntity> getAll() { return ResponseEntity.ok(service.findAll()); } @GetMapping("/{id}") public ResponseEntity getById(@PathVariable Long id) { YourEntity entity = service.findById(id); if (entity == null) { return ResponseEntity.notFound().build(); } return ResponseEntity.ok(entity); } @PostMapping public ResponseEntity create(@RequestBody YourEntity entity) { YourEntity newEntity = service.save(entity); return ResponseEntity.ok(newEntity); } @DeleteMapping("/{id}") public ResponseEntity deleteById(@PathVariable Long id) { service.deleteById(id); return ResponseEntity.ok().build(); } } ``` 此外，你需要在`application.properties`文件中配置Oracle数据库的连接信息： ```properties spring.datasource.url=jdbc:oracle:thin:@//host:port/dbname spring.datasource.username=your_username spring.datasource.password=your_password spring.datasource.driver-class-name=oracle.jdbc.OracleDriver spring.jpa.database-platform=org.hibernate.dialect.Oracle12cDialect spring.jpa.hibernate.ddl-auto=update ``` 确保你有Oracle的JDBC驱动在项目的依赖中，如果是Maven项目，你需要在`pom.xml`中添加以下依赖： ```xml com.oracle.database.jdbc ojdbc8 19.8.0.0 ``` 请根据实际情况调整以上代码中的类名、方法名、变量名等。