我是Spring Boot / JPA的初学者。我正在尝试为出租车模型执行CRUD操作。
我收到以下错误：
com.microsoft.sqlserver.jdbc.SQLServerException：无效的列名 'taxi_id'
任何帮助将不胜感激。
这是我的存储库代码：
package com.example.SpringBoot.Model.Repository;
import org.springframework.data.repository.CrudRepository;
import com.example.SpringBoot.Model.Taxi;
public interface DAO extends CrudRepository<Taxi, Integer>{
}
控制器
package com.example.SpringBoot.Controller;
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.DeleteMapping;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.PutMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import com.example.SpringBoot.Model.Taxi;
import com.example.SpringBoot.Model.Repository.DAO;
@RestController
public class TaxiController {
@Autowired
public DAO repo;
@PutMapping(path= "/Taxi" , produces = {"application/json"})
public Taxi insertTaxi(Taxi taxi) {
repo.save(taxi);
return taxi;
}
@DeleteMapping(path ="/Taxi/{TaxiId}")
public void deleteTaxi(@RequestParam int TaxiId) {
repo.deleteById(TaxiId);
}
@GetMapping(path ="/Taxi")
public List<Taxi> displayTaxi() {
return (List<Taxi>) repo.findAll();
}
}
模型类
package com.example.SpringBoot.Model;
import java.math.BigDecimal;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
@Entity
public class Taxi {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private int TaxiId;
private String TaxiType;
public int getTaxiId() {
return TaxiId;
}
public void setTaxiId(int taxiId) {
TaxiId = taxiId;
}
public String getTaxiType() {
return TaxiType;
}
public void setTaxiType(String taxiType) {
TaxiType = taxiType;
}
}
SQL服务器代码
CREATE TABLE [dbo].[Taxi](
[Taxiid] [int] IDENTITY(1,1) NOT NULL,
[TaxiType] [varchar](1) NOT NULL,
PRIMARY KEY CLUSTERED
(
[TaxiId] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]
堆栈跟踪：
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v2.1.4.RELEASE)
2019-06-03 15:37:24.554 INFO 7808 --- [ main] c.e.SpringBoot.TaxiBookingApplication : Starting TaxiBookingApplication on IMCHLT080 with PID 7808 (D:\workspace\TaxiBooking\target\classes started by vignesh_nithin in D:\workspace\TaxiBooking
.............
2019-06-03 15:37:34.446 INFO 7808 --- [nio-8081-exec-1] o.s.web.servlet.DispatcherServlet : Initializing Servlet 'dispatcherServlet'
2019-06-03 15:37:34.456 INFO 7808 --- [nio-8081-exec-1] o.s.web.servlet.DispatcherServlet : Completed initialization in 10 ms
2019-06-03 15:37:34.530 INFO 7808 --- [nio-8081-exec-1] o.h.h.i.QueryTranslatorFactoryInitiator : HHH000397: Using ASTQueryTranslatorFactory
2019-06-03 15:37:34.645 WARN 7808 --- [nio-8081-exec-1] o.h.engine.jdbc.spi.SqlExceptionHelper : SQL Error: 207, SQLState: S0001
2019-06-03 15:37:34.645 ERROR 7808 --- [nio-8081-exec-1] o.h.engine.jdbc.spi.SqlExceptionHelper : Invalid column name 'taxi_id'.
2019-06-03 15:37:34.668 ERROR 7808 --- [nio-8081-exec-1] o.a.c.c.C.[.[.[/].[dispatcherServlet] : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is org.springframework.dao.InvalidDataAccessResourceUsageException: could not extract ResultSet; SQL [n/a]; nested exception is org.hibernate.exception.SQLGrammarException: could not extract ResultSet] with root cause
com.microsoft.sqlserver.jdbc.SQLServerException: Invalid column name 'taxi_id'.
at com.microsoft.sqlserver.jdbc.SQLServerException.makeFromDatabaseError(SQLServerException.java:259) ~[mssql-jdbc-6.4.0.jre8.jar:na]
at com.microsoft.sqlserver.jdbc.SQLServerStatement.getNextResult(SQLServerStatement.java:1547) ~[mssql-jdbc-6.4.0.jre8.jar:na]
at com.microsoft.sqlserver.jdbc.SQLServerPreparedStatement.doExecutePreparedStatement(SQLServerPreparedStatement.java:548) ~[mssql-jdbc-6.4.0.jre8.jar:na]
at com.microsoft.sqlserver.jdbc.SQLServerPreparedStatement$PrepStmtExecCmd.doExecute(SQLServerPreparedStatement.java:479) ~[mssql-jdbc-6.4.0.jre8.jar:na]
我希望根据所击中的URL显示/插入/删除出租车表数据。
答案 0 :(得分：3)
默认情况下，您的持久性配置似乎通过用下划线将其分隔来转换驼峰格式。因此，如果您有：
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private int TaxiId;
它将尝试使用：'taxi_id';
在db上，您具有：
CREATE TABLE [dbo].[Taxi](
[Taxiid] [int] IDENTITY(1,1) NOT NULL,
您应该将字段名称更改为：“ Taxiid”或明确命名该列：
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
@Column(name = "Taxiid")
private int TaxiId;
您还可以尝试通过相应地更改以下属性来更改默认的命名策略：
spring.jpa.hibernate.naming.implicit-strategy
spring.jpa.hibernate.naming.physical-strategy