我对 Spring Boot 相当陌生，尝试在连接到 MariaDB 数据库的 Spring Boot 2.2.5.RELEASE 项目上配置 JPA 时遇到一些困难。
这里是上述项目的 Github 存储库链接:https://github.com/AndreaNobili/SpringBoot-Excel-API
我尝试详细解释我的情况:
在我的 MariaDB 服务器中，有一个名为 db_test 的数据库，其中包含一个名为 order 的表，并具有以下结构:
'id', 'bigint(20)', 'NO', 'PRI', NULL, 'auto_increment'
'name', 'varchar(255)', 'NO', '', NULL, ''
'address', 'varchar(255)', 'NO', '', NULL, ''
'product', 'varchar(255)', 'NO', '', NULL, ''
'order_date_time', 'datetime', 'NO', '', NULL, ''
'quantity', 'tinyint(4)', 'NO', '', NULL, ''
然后我有一个名为 Order 的模型类映射上一个表:
@Entity // This tells Hibernate to make a table out of this class
public class Order {
@Id
@GeneratedValue(strategy=GenerationType.AUTO)
private int id;
@Column(name = "name")
private String fullName;
private String address;
private String product;
@Column(name = "order_date_time")
private String orderDate;
private Double quantity;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getFullName() {
return fullName;
}
public void setFullName(String fullName) {
this.fullName = fullName;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
public String getProduct() {
return product;
}
public void setProduct(String product) {
this.product = product;
}
public String getOrderDate() {
return orderDate;
}
public void setOrderDate(String orderDate) {
this.orderDate = orderDate;
}
public Double getQuantity() {
return quantity;
}
public void setQuantity(Double quantity) {
this.quantity = quantity;
}
}
我定义了这个 JPA OrderRepository 接口(interface)，扩展了 CrudRepository 接口(interface):
package com.springboot.excelapi.repository;
import org.springframework.data.repository.CrudRepository;
import com.springboot.excelapi.dto.Order;
public interface OrderRepository extends CrudRepository<Order, Integer> {
}
然后我创建了一个服务类，调用之前的存储库(以实现业务逻辑服务层):
首先我定义了一个 OrderService 接口(interface):
package com.springboot.excelapi.service;
import java.util.List;
import com.springboot.excelapi.dto.Order;
public interface OrderService {
public List<Order> getOrdersList();
}
然后我实现了OrderServiceImpl具体类来实现之前的接口(interface):
package com.springboot.excelapi.service;
import java.util.ArrayList;
import java.util.List;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import com.springboot.excelapi.dto.Order;
import com.springboot.excelapi.repository.OrderRepository;
@Service
public class OrderServiceImpl implements OrderService {
@Autowired
OrderRepository orderRepository;
public List<Order> getOrdersList() {
List<Order> result = (List<Order>) orderRepository.findAll();
//List<Order> result = new ArrayList<Order>();
return result;
}
}
正如您所看到的，此类被注释为 @Service ，并且在主体中，我正在 Autowiring 之前用于执行查询的 OrderRepository 接口(interface)。
在 src/main/resources 文件夹中，有 application.yml 配置文件:
spring:
application:
name: Spring Boot Excel API
datasource:
driverClassName: org.mariadb.jdbc.Driver
url: jdbc:mariadb://localhost:3306/db_test
username: admin
password: password
timeBetweenEvictionRunsMillis: 1000
testWhileIdle: true
validationQuery: SELECT 1
jpa:
hibernate:
ddl-auto: none
它包含与 MariaDB 数据库连接和 JPA 配置相关的信息。目前，ddl-auto 设置为 none，因为我想避免模型类中的更改不会影响我的数据库表结构。
最后我有了这个 JUnit 测试类:
@RunWith(SpringRunner.class)
@SpringBootTest(classes = { Application.class })
@WebAppConfiguration
@ActiveProfiles(profiles = { "no-liquibase" })
public class ExcelResourceIntegrationTest {
@Autowired
OrderServiceImpl orderService;
@Test
public void getOrdersListServiceTest() {
List<Order> ordersList = orderService.getOrdersList();
assertThat(ordersList).isNotEmpty();
}
}
它包含我用来测试先前服务的getOrdersListRepositoryTest()测试方法。
在 Debug模式下执行此方法，它会进入 getOrdersList() 服务方法，但当它尝试执行此行时:
List<Order> result = (List<Order>) orderRepository.findAll();
它出错了，我得到了一个异常。
在控制台中我收到此错误消息:
2020-03-23 08:39:19.310 INFO 3781 --- [ main] c.s.e.i.ExcelResourceIntegrationTest : Started ExcelResourceIntegrationTest in 5.136 seconds (JVM running for 6.459)
2020-03-23 08:39:19.719 WARN 3781 --- [ main] o.h.engine.jdbc.spi.SqlExceptionHelper : SQL Error: 1064, SQLState: 42000
2020-03-23 08:39:19.719 ERROR 3781 --- [ main] o.h.engine.jdbc.spi.SqlExceptionHelper : (conn:36) You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'order order0_' at line 1
Query is: select order0_.id as id1_0_, order0_.address as address2_0_, order0_.name as name3_0_, order0_.order_date_time as order_da4_0_, order0_.product as product5_0_, order0_.quantity as quantity6_0_ from order order0_
2020-03-23 08:39:19.879 INFO 3781 --- [extShutdownHook] o.s.s.concurrent.ThreadPoolTaskExecutor : Shutting down ExecutorService 'applicationTaskExecutor'
2020-03-23 08:39:19.882 INFO 3781 --- [extShutdownHook] j.LocalContainerEntityManagerFactoryBean : Closing JPA EntityManagerFactory for persistence unit 'default'
2020-03-23 08:39:19.888 INFO 3781 --- [extShutdownHook] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Shutdown initiated...
2020-03-23 08:39:19.907 INFO 3781 --- [extShutdownHook] com.zaxxer.hikari.HikariDataSource : HikariPool-1 - Shutdown completed.
因此，据我所知，Hibernate 正在尝试执行此查询:
select order0_.id as id1_0_, order0_.address as address2_0_, order0_.name as name3_0_, order0_.order_date_time as order_da4_0_, order0_.product as product5_0_, order0_.quantity as quantity6_0_ from order order0_
在我看来很奇怪:为什么order0？
在堆栈跟踪中，我发现了此异常:
org.springframework.dao.InvalidDataAccessResourceUsageException: could not extract ResultSet; SQL [n/a]; nested exception is org.hibernate.exception.SQLGrammarException: could not extract ResultSet
at org.springframework.orm.jpa.vendor.HibernateJpaDialect.convertHibernateAccessException(HibernateJpaDialect.java:281)
at org.springframework.orm.jpa.vendor.HibernateJpaDialect.translateExceptionIfPossible(HibernateJpaDialect.java:255)
at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.translateExceptionIfPossible(AbstractEntityManagerFactoryBean.java:528)
at org.springframework.dao.support.ChainedPersistenceExceptionTranslator.translateExceptionIfPossible(ChainedPersistenceExceptionTranslator.java:61)
at org.springframework.dao.support.DataAccessUtils.translateIfNecessary(DataAccessUtils.java:242)
at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:153)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
at org.springframework.data.jpa.repository.support.CrudMethodMetadataPostProcessor$CrudMethodMetadataPopulatingMethodInterceptor.invoke(CrudMethodMetadataPostProcessor.java:178)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:95)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:212)
at com.sun.proxy.$Proxy105.findAll(Unknown Source)
at com.springboot.excelapi.service.OrderServiceImpl.getOrdersList(OrderServiceImpl.java:21)
at com.springboot.excelapi.integration.ExcelResourceIntegrationTest.getOrdersListServiceTest(ExcelResourceIntegrationTest.java:100)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:567)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.springframework.test.context.junit4.statements.RunBeforeTestExecutionCallbacks.evaluate(RunBeforeTestExecutionCallbacks.java:74)
at org.springframework.test.context.junit4.statements.RunAfterTestExecutionCallbacks.evaluate(RunAfterTestExecutionCallbacks.java:84)
at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:75)
at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:86)
at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:84)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:251)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:97)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:190)
at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
at org.junit.runner.JUnitCore.run(JUnitCore.java:115)
at org.junit.vintage.engine.execution.RunnerExecutor.execute(RunnerExecutor.java:40)
at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183)
at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:195)
at java.base/java.util.Iterator.forEachRemaining(Iterator.java:133)
at java.base/java.util.Spliterators$IteratorSpliterator.forEachRemaining(Spliterators.java:1801)
at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484)
at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:474)
at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150)
at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173)
at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:497)
at org.junit.vintage.engine.VintageTestEngine.executeAllChildren(VintageTestEngine.java:80)
at org.junit.vintage.engine.VintageTestEngine.execute(VintageTestEngine.java:71)
at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:229)
at org.junit.platform.launcher.core.DefaultLauncher.lambda$execute$6(DefaultLauncher.java:197)
at org.junit.platform.launcher.core.DefaultLauncher.withInterceptedStreams(DefaultLauncher.java:211)
at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:191)
at org.junit.platform.launcher.core.DefaultLauncher.execute(DefaultLauncher.java:137)
at org.eclipse.jdt.internal.junit5.runner.JUnit5TestReference.run(JUnit5TestReference.java:89)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:41)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:542)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:770)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:464)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:210)
Caused by: org.hibernate.exception.SQLGrammarException: could not extract ResultSet
at org.hibernate.exception.internal.SQLExceptionTypeDelegate.convert(SQLExceptionTypeDelegate.java:63)
at org.hibernate.exception.internal.StandardSQLExceptionConverter.convert(StandardSQLExceptionConverter.java:42)
at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:113)
at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:99)
at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.extract(ResultSetReturnImpl.java:67)
at org.hibernate.loader.Loader.getResultSet(Loader.java:2292)
at org.hibernate.loader.Loader.executeQueryStatement(Loader.java:2050)
at org.hibernate.loader.Loader.executeQueryStatement(Loader.java:2012)
at org.hibernate.loader.Loader.doQuery(Loader.java:953)
at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:354)
at org.hibernate.loader.Loader.doList(Loader.java:2838)
at org.hibernate.loader.Loader.doList(Loader.java:2820)
at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2652)
at org.hibernate.loader.Loader.list(Loader.java:2647)
at org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:506)
at org.hibernate.hql.internal.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:396)
at org.hibernate.engine.query.spi.HQLQueryPlan.performList(HQLQueryPlan.java:219)
at org.hibernate.internal.SessionImpl.list(SessionImpl.java:1404)
at org.hibernate.query.internal.AbstractProducedQuery.doList(AbstractProducedQuery.java:1562)
at org.hibernate.query.internal.AbstractProducedQuery.list(AbstractProducedQuery.java:1530)
at org.hibernate.query.Query.getResultList(Query.java:165)
at org.hibernate.query.criteria.internal.compile.CriteriaQueryTypeQueryAdapter.getResultList(CriteriaQueryTypeQueryAdapter.java:76)
at org.springframework.data.jpa.repository.support.SimpleJpaRepository.findAll(SimpleJpaRepository.java:355)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:567)
at org.springframework.data.repository.core.support.RepositoryComposition$RepositoryFragments.invoke(RepositoryComposition.java:371)
at org.springframework.data.repository.core.support.RepositoryComposition.invoke(RepositoryComposition.java:204)
at org.springframework.data.repository.core.support.RepositoryFactorySupport$ImplementationMethodExecutionInterceptor.invoke(RepositoryFactorySupport.java:657)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.doInvoke(RepositoryFactorySupport.java:621)
at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.invoke(RepositoryFactorySupport.java:605)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:366)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:99)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:139)
... 61 more
Caused by: java.sql.SQLSyntaxErrorException: (conn:36) You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'order order0_' at line 1
Query is: select order0_.id as id1_0_, order0_.address as address2_0_, order0_.name as name3_0_, order0_.order_date_time as order_da4_0_, order0_.product as product5_0_, order0_.quantity as quantity6_0_ from order order0_
at org.mariadb.jdbc.internal.util.ExceptionMapper.get(ExceptionMapper.java:139)
at org.mariadb.jdbc.internal.util.ExceptionMapper.getException(ExceptionMapper.java:101)
at org.mariadb.jdbc.internal.util.ExceptionMapper.throwAndLogException(ExceptionMapper.java:77)
at org.mariadb.jdbc.MariaDbStatement.executeQueryEpilog(MariaDbStatement.java:224)
at org.mariadb.jdbc.MariaDbClientPreparedStatement.executeInternal(MariaDbClientPreparedStatement.java:232)
at org.mariadb.jdbc.MariaDbClientPreparedStatement.executeQuery(MariaDbClientPreparedStatement.java:177)
at com.zaxxer.hikari.pool.ProxyPreparedStatement.executeQuery(ProxyPreparedStatement.java:52)
at com.zaxxer.hikari.pool.HikariProxyPreparedStatement.executeQuery(HikariProxyPreparedStatement.java)
at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.extract(ResultSetReturnImpl.java:57)
... 94 more
Caused by: org.mariadb.jdbc.internal.util.dao.QueryException: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'order order0_' at line 1
Query is: select order0_.id as id1_0_, order0_.address as address2_0_, order0_.name as name3_0_, order0_.order_date_time as order_da4_0_, order0_.product as product5_0_, order0_.quantity as quantity6_0_ from order order0_
at org.mariadb.jdbc.internal.protocol.AbstractQueryProtocol.readErrorPacket(AbstractQueryProtocol.java:1098)
at org.mariadb.jdbc.internal.protocol.AbstractQueryProtocol.readPacket(AbstractQueryProtocol.java:1030)
at org.mariadb.jdbc.internal.protocol.AbstractQueryProtocol.getResult(AbstractQueryProtocol.java:985)
at org.mariadb.jdbc.internal.protocol.AbstractQueryProtocol.executeQuery(AbstractQueryProtocol.java:161)
at org.mariadb.jdbc.MariaDbClientPreparedStatement.executeInternal(MariaDbClientPreparedStatement.java:223)
... 98 more
我还附上了我的 pom.xml 文件:
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.springboot</groupId>
<artifactId>excel-api-SOC</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>
<name>Excel API with Spring Boot 2</name>
<description>Spring Boot - working with Excel API</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.2.5.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-security</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.security</groupId>
<artifactId>spring-security-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.springframework.security</groupId>
<artifactId>spring-security-data</artifactId>
</dependency>
<!-- Start of excel dependencies -->
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi</artifactId>
<version>3.11</version>
</dependency>
<dependency>
<groupId>org.apache.poi</groupId>
<artifactId>poi-ooxml</artifactId>
<version>3.11</version>
</dependency>
<!-- End of excel dependencies -->
<dependency>
<groupId>commons-io</groupId>
<artifactId>commons-io</artifactId>
<version>2.6</version>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
<version>3.9</version>
</dependency>
<!-- Start DB connectivity dependencies -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</artifactId>
</dependency>
<dependency>
<groupId>org.mariadb.jdbc</groupId>
<artifactId>mariadb-java-client</artifactId>
<version>1.5.7</version>
</dependency>
<!-- End DB connectivity dependencies -->
<!-- JPA dependency -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
最佳答案
您的表名为 order，它是所有 SQL 方言中的关键字(提示: ORDER BY 子句)。不要将表命名为 order，除非您希望在编写 SQL 语句时始终必须引用该名称。
您仍然可以将 Java 类命名为 Order，但您应该将该表命名为其他名称，例如customer_order、product_order、order_detail 或类似的内容。
关于java - 为什么我在使用 Spring Data JPA 的 Spring Boot 项目中获取此 "org.hibernate.exception.SQLGrammarException"？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/60817366/