从内存数据库中的 H2 切换到 SQL Server 时出错
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【中文标题】从内存数据库中的 H2 切换到 SQL Server 时出错【英文标题】:Error when switching from H2 in memory database to SQL Server 【发布时间】:2019-02-07 22:25:01 【问题描述】:我的项目有这样的要求,用户将 CSV 文件放在必须推送到 SQL Server 数据库的共享位置。我遇到的所有教程都只是使用带有硬编码 CSV 文件的内存数据库,如下所示
https://github.com/TechPrimers/spring-batch-example-1
我能够成功运行应用程序以将 CSV 加载到数据库中,只需对资源路径进行一些更改。
http://localhost:8081/load - Spring Batch 的触发点。http://localhost:8081/h2-console - 用于查询内存表的 H2 控制台。
关于如何根据我们的要求运行此程序,我有几个一般性问题:
据我所知,内存中会自动配置DataSource
,类似于我们在下面看到的:org.hibernate.dialect.H2Dialect
的意义是什么?
spring.datasource.url=jdbc:h2:mem:testdb
spring.datasource.driverClassName=org.h2.Driver
spring.datasource.username=sa
spring.datasource.password=
spring.jpa.database-platform=org.hibernate.dialect.H2Dialect
替换为以下 sql server 配置:
spring.datasource.url=jdbc:sqlserver://localhost;databaseName=springbootdb
spring.datasource.username=sa
spring.datasource.password=Projects@123
spring.datasource.driverClassName=com.microsoft.sqlserver.jdbc.SQLServerDriver
用SQL Server替换了H2数据库jar:com.microsoft.sqlserver mssql-jdbc
6.1.0.jre8
test
从内存切换到其他数据源(SQL 服务器)时,我不确定 JPA 的重要性?以下是我们在将其DataSource
从内存数据库更改为 SQL Server 时遇到的错误,我们将不胜感激。
Error starting ApplicationContext. To display the auto-configuration report re-run your application with 'debug' enabled.
2018-09-02 23:25:50.822 ERROR 6360 --- [ restartedMain] o.s.boot.SpringApplication : Application startup failed
org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'inMemoryDatabaseShutdownExecutor' defined in class path resource [org/springframework/boot/devtools/autoconfigure/DevToolsDataSourceAutoConfiguration.class]: Unsatisfied dependency expressed through method 'inMemoryDatabaseShutdownExecutor' parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'dataSource' defined in class path resource [org/springframework/boot/autoconfigure/jdbc/DataSourceConfiguration$Tomcat.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.apache.tomcat.jdbc.pool.DataSource]: Factory method 'dataSource' threw exception; nested exception is java.lang.IllegalStateException: Cannot load driver class: com.microsoft.sqlserver.jdbc.SQLServerDriver
at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:749) ~[spring-beans-4.3.18.RELEASE.jar:4.3.18.RELEASE]
at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:467) ~[spring-beans-4.3.18.RELEASE.jar:4.3.18.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1181) ~[spring-beans-4.3.18.RELEASE.jar:4.3.18.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1075) ~[spring-beans-4.3.18.RELEASE.jar:4.3.18.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:513) ~[spring-beans-4.3.18.RELEASE.jar:4.3.18.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483) ~[spring-beans-4.3.18.RELEASE.jar:4.3.18.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:312) ~[spring-beans-4.3.18.RELEASE.jar:4.3.18.RELEASE]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) ~[spring-beans-4.3.18.RELEASE.jar:4.3.18.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:308) ~[spring-beans-4.3.18.RELEASE.jar:4.3.18.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197) ~[spring-beans-4.3.18.RELEASE.jar:4.3.18.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:297) ~[spring-beans-4.3.18.RELEASE.jar:4.3.18.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197) ~[spring-beans-4.3.18.RELEASE.jar:4.3.18.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1080) ~[spring-context-4.3.18.RELEASE.jar:4.3.18.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:857) ~[spring-context-4.3.18.RELEASE.jar:4.3.18.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:543) ~[spring-context-4.3.18.RELEASE.jar:4.3.18.RELEASE]
at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:122) ~[spring-boot-1.5.14.RELEASE.jar:1.5.14.RELEASE]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:693) [spring-boot-1.5.14.RELEASE.jar:1.5.14.RELEASE]
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:360) [spring-boot-1.5.14.RELEASE.jar:1.5.14.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:303) [spring-boot-1.5.14.RELEASE.jar:1.5.14.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1118) [spring-boot-1.5.14.RELEASE.jar:1.5.14.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1107) [spring-boot-1.5.14.RELEASE.jar:1.5.14.RELEASE]
at com.techprimers.springbatchexample1.SpringBatchExample1Application.main(SpringBatchExample1Application.java:10) [classes/:na]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_151]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_151]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_151]
at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_151]
at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:49) [spring-boot-devtools-1.5.14.RELEASE.jar:1.5.14.RELEASE]
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'dataSource' defined in class path resource [org/springframework/boot/autoconfigure/jdbc/DataSourceConfiguration$Tomcat.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.apache.tomcat.jdbc.pool.DataSource]: Factory method 'dataSource' threw exception; nested exception is java.lang.IllegalStateException: Cannot load driver class: com.microsoft.sqlserver.jdbc.SQLServerDriver
at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:599) ~[spring-beans-4.3.18.RELEASE.jar:4.3.18.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1181) ~[spring-beans-4.3.18.RELEASE.jar:4.3.18.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1075) ~[spring-beans-4.3.18.RELEASE.jar:4.3.18.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:513) ~[spring-beans-4.3.18.RELEASE.jar:4.3.18.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483) ~[spring-beans-4.3.18.RELEASE.jar:4.3.18.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:312) ~[spring-beans-4.3.18.RELEASE.jar:4.3.18.RELEASE]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) ~[spring-beans-4.3.18.RELEASE.jar:4.3.18.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:308) ~[spring-beans-4.3.18.RELEASE.jar:4.3.18.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) ~[spring-beans-4.3.18.RELEASE.jar:4.3.18.RELEASE]
at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:208) ~[spring-beans-4.3.18.RELEASE.jar:4.3.18.RELEASE]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1138) ~[spring-beans-4.3.18.RELEASE.jar:4.3.18.RELEASE]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1066) ~[spring-beans-4.3.18.RELEASE.jar:4.3.18.RELEASE]
at org.springframework.beans.factory.support.ConstructorResolver.resolveAutowiredArgument(ConstructorResolver.java:835) ~[spring-beans-4.3.18.RELEASE.jar:4.3.18.RELEASE]
at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:741) ~[spring-beans-4.3.18.RELEASE.jar:4.3.18.RELEASE]
... 26 common frames omitted
Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.apache.tomcat.jdbc.pool.DataSource]: Factory method 'dataSource' threw exception; nested exception is java.lang.IllegalStateException: Cannot load driver class: com.microsoft.sqlserver.jdbc.SQLServerDriver
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:189) ~[spring-beans-4.3.18.RELEASE.jar:4.3.18.RELEASE]
at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:588) ~[spring-beans-4.3.18.RELEASE.jar:4.3.18.RELEASE]
... 39 common frames omitted
Caused by: java.lang.IllegalStateException: Cannot load driver class: com.microsoft.sqlserver.jdbc.SQLServerDriver
【问题讨论】:
【参考方案1】:
org.hibernate.dialect.H2Dialect
有什么意义?
像 Hibernate 这样的 JPA 实现需要生成 SQL。
此 SQL 的外观细节取决于数据库。
Dialect
封装了这些差异。
所以指定org.hibernate.dialect.H2Dialect
告诉Hibernate 生成适合H2 数据库的SQL。
这应该与您当前的问题无关。
关于你得到的异常
异常的根本原因是:
java.lang.IllegalStateException: Cannot load driver class: com.microsoft.sqlserver.jdbc.SQLServerDriver
这很可能意味着提到的类不在类路径中。
您将使用的依赖项描述为
com.microsoft.sqlserver mssql-jdbc 6.1.0.jre8 test
我认为这应该意味着你的pom.xml
中的这个sn-p
<dependency>
<groupId>com.microsoft.sqlserver</groupId>
<artifactId>mssql-jdbc</artifactId>
<version>6.1.0.jre8</version>
<scope>test</scope>
</dependency>
如果是这种情况,您只需将驱动程序添加到测试范围。
IE。它仅可用于测试。
但是您似乎尝试实际启动您的应用程序,而不仅仅是运行一些测试。
因此删除行 <scope>test</scope>
应该可以解决问题。
【讨论】:
【参考方案2】:您是否在pom.xml
中添加了以下依赖项
<dependency>
<groupId>com.microsoft.sqlserver</groupId>
<artifactId>sqljdbc4</artifactId>
<version>4.0</version>
</dependency>
更多信息请参考:https://springframework.guru/configuring-spring-boot-for-microsoft-sql-server/
【讨论】:
好的,通过更正错字更新了问题。谢谢 谢谢,我们尝试了所有这些,没有午餐,正如我在帖子中发布的那样,我们使用的是 mssql-jdbc 6.1.0。,它适用于我们的一个项目。您是否尝试过上述代码库或猜测答案? 在 maven 项目中手动添加 jar 可能会有风险,因为有可能发生冲突等等。我之前尝试过这些东西,它在附加的链接中有效。以上是关于从内存数据库中的 H2 切换到 SQL Server 时出错的主要内容,如果未能解决你的问题,请参考以下文章
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