R2DBC 无法使用 h2 协议创建连接

Question

我正在尝试利用 H2 进行测试并在 中有以下配置src/test/resources/application.yaml：

spring:
  r2dbc:
    url: r2dbc:h2:file://testdb

我有一个带有注释的空测试，@SpringBootTest但是当我运行它时，出现以下错误：

Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [io.r2dbc.pool.ConnectionPool]: Factory method 'connectionFactory' threw exception; nested exception is java.lang.IllegalStateException: Unable to create a ConnectionFactory for 'ConnectionFactoryOptions{options={driver=h2, protocol=file, host=testdb}}'. Available drivers: [ pool, postgresql, h2 ]
    at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:185)
    at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:651)
    ... 131 common frames omitted
Caused by: java.lang.IllegalStateException: Unable to create a ConnectionFactory for 'ConnectionFactoryOptions{options={driver=h2, protocol=file, host=testdb}}'. Available drivers: [ pool, postgresql, h2 ]
    at io.r2dbc.spi.ConnectionFactories.get(ConnectionFactories.java:145)
    at org.springframework.boot.autoconfigure.r2dbc.ConnectionFactoryBuilder.build(ConnectionFactoryBuilder.java:125)
    at org.springframework.boot.autoconfigure.r2dbc.ConnectionFactoryConfigurations.createConnectionFactory(ConnectionFactoryConfigurations.java:56)
    at org.springframework.boot.autoconfigure.r2dbc.ConnectionFactoryConfigurations$Pool.connectionFactory(ConnectionFactoryConfigurations.java:68)
    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:566)
    at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:154)
    ... 132 common frames omitted

以下是来自 的相关依赖项pom.xml：

<dependency>
    <groupId>io.r2dbc</groupId>
    <artifactId>r2dbc-h2</artifactId>
    <version>0.8.4.RELEASE</version>
    <scope>test</scope>
</dependency>
<dependency>
    <groupId>com.h2database</groupId>
    <artifactId>h2</artifactId>
    <version>1.4.200</version>
    <scope>test</scope>
</dependency>

Answer 1

对您的 application.yml 文件进行以下更改：

spring:
  r2dbc:
    url: r2dbc:h2:mem:///testdb #create DB in memory

---
spring:
  r2dbc:
    url: r2dbc:h2:file:///./testdb #create DB in a file testdb.mv.db