Spring H2 数据库 EmbeddedDatabaseFactory 错误连接 URL [英] Spring H2 database EmbeddedDatabaseFactory wrong connection URL

问题描述

我正在尝试使用 Spring-Boot 2、Java 11、H2 数据库和 Gradle 构建一个简单的 REST 后端.我想使用嵌入式(文件)H2 数据库，所以我的(相关)application.yml(我知道它被正确读取，因为其他值有效)看起来像这样:

I'm trying to build a simple REST-Backend with Spring-Boot 2, Java 11, H2 database and Gradle. I want to use an embedded (file) H2 database, so my (relevant) application.yml (I know it is read in correctly because other values work) looks like this:

spring:
    datasource:
        url: "jdbc:h2:./customdb"
        username: sa
        driver-class-name: org.h2.Driver
    jpa:
        database-platform: org.hibernate.dialect.H2Dialect
        show-sql: false
        hibernate:
            ddl-auto: update

我的build.gradle:

plugins {
    id 'org.springframework.boot' version '2.1.3.RELEASE'
    id 'java'
}

apply plugin: 'io.spring.dependency-management'

group = 'net.impfox'
version = '0.0.1-SNAPSHOT'
sourceCompatibility = '11'

configurations {
    compileOnly {
        extendsFrom annotationProcessor
    }
}

repositories {
    mavenCentral()
}

dependencies {
    compileOnly 'org.projectlombok:lombok'
    annotationProcessor 'org.projectlombok:lombok'
    runtimeOnly 'com.h2database:h2'
    runtimeOnly 'org.springframework.boot:spring-boot-devtools'
    implementation 'org.springframework.boot:spring-boot-starter-web'
    testImplementation 'org.springframework.boot:spring-boot-starter-test'

    compile 'org.springframework.boot:spring-boot-starter-data-rest:2.1.3.RELEASE'
    compile 'org.springframework.boot:spring-boot-starter-thymeleaf'
    compile 'javax.persistence:javax.persistence-api:2.2'
    compile 'org.hibernate:hibernate-core'
    compile 'org.springframework.data:spring-data-jpa'
}

但是，当我启动应用程序时，没有创建文件并且日志显示:

However, when I start the application, there is no file created and the log says:

...EmbeddedDatabaseFactory: Starting embedded database: url='jdbc:h2:mem:testdb;DB_CLOSE_DELAY=-1;DB_CLOSE_ON_EXIT=false', username='sa'

我不太清楚它为什么说Starting embedding database，因为正如您在url 中看到的那样，它实际上启动了一个名为testdb 的内存数据库.那么为什么它使用 jdbc:h2:mem:testdb 作为 JDBC url 而不是我配置的 jdbc:h2:./customdb?

I'm not quite sure why it says Starting embedded database because as you can see in the url, it actually starts an in-memory database called testdb. So why is it using jdbc:h2:mem:testdb as JDBC url and not my configured jdbc:h2:./customdb?

推荐答案

检查您的 gradle 依赖项！

Check your gradle dependencies!

代替
编译'org.springframework.data:spring-data-jpa',
使用 spring-boot-starter-data-jpa，所以类似
编译'org.springframework.boot:spring-boot-starter-data-jpa:2.1.4.RELEASE'.
还要确保 gradle 实际上正在应用此更改.

Instead of
compile 'org.springframework.data:spring-data-jpa',
use the spring-boot-starter-data-jpa, so something like
compile 'org.springframework.boot:spring-boot-starter-data-jpa:2.1.4.RELEASE'.
Also make sure gradle is actually applying this change.

问题是 spring-data-jpa 不包括所有需要的功能.spring-boot-starter-data-jpa 依赖于 spring-data-jpa，但也依赖于其他一些工件.

The problem is that spring-data-jpa doesn't include all the functionality needed. The spring-boot-starter-data-jpa depends on the spring-data-jpa, but also on some other artifacts.

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