Micronaut 从文件 Groovy 代码中读取数据库连接字符串

Question

目前我正在application.yaml文件中设置数据库连接信息。对于生产部署，我需要从文件中读取数据库连接字符串。

在 Gitter 中我得到了使用 micronaut.config.files 值的提示，但它不起作用。

我在 dbinfo.properties 文件中定义了数据库连接值，然后将 build.gradle 文件更新为这样。

run {
    environment('micronaut.environments','dev')
    environment 'micronaut.config.files', 'C:\shared\application.dev.properties'    
}

在application.yaml

dataSource:
  url: ${DBURL}
  dbCreate: create-update
  pooled: true
  jmxExport: true
  driverClassName: com.mysql.cj.jdbc.Driver
  dialect: org.hibernate.dialect.MySQL5InnoDBDialect
  username: ${DBUSER}
  password: ${DBPASSWORD}

当我运行给出以下错误信息时。

Caused by: io.micronaut.context.exceptions.BeanInstantiationException: Error instantiating bean of type [org.grails.orm.hibernate.HibernateDatastore]: Could not resolve placeholder ${DBURL} in value: ${DBURL}

是否有从文件 Micronaut Groovy 代码中读取数据库连接字符串的示例代码？

谢谢

SR

更新：2/26/19

我像这样更新了 build.gradle 文件仍然是同样的错误。

run {
    systemProperty('micronaut.environments','dev')
    systemProperty('micronaut.config.files', 'C:\shared\application.dev.properties')
}

来自 Application.grooy 文件

class Application {
    static void main(String[] args) {      
        String filename=System.properties['micronaut.config.files']
        File f= new File(filename)
        if( f.exists()){
            println "File found: $filename"
            println f.text
        } else{
            println "file not found : $filename"
        }
        Micronaut.run(Application)
    }
}

错误信息

19:31:49.925 [main] INFO  i.m.context.env.DefaultEnvironment - Established active environments: [dev]
19:31:50.700 [main] INFO  i.m.c.h.g.HibernateDatastoreFactory - Starting GORM for Hibernate
19:31:50.925 [main] ERROR io.micronaut.runtime.Micronaut - Error starting Micronaut server: Bean definition [org.grails.orm.hibernate.HibernateDatastore] could not be loaded: Error instantiating bean of type [org.grails.orm.hibernate.HibernateDatastore]: Could not resolve placeholder ${DBURL} in value: ${DBURL}
io.micronaut.context.exceptions.BeanInstantiationException: Bean definition [org.grails.orm.hibernate.HibernateDatastore] could not be loaded: Error instantiating bean of type [org.grails.orm.hibernate.HibernateDatastore]: Could not resolve placeholder ${DBURL} in value: ${DBURL}
    at io.micronaut.context.DefaultBeanContext.initializeContext(DefaultBeanContext.java:1040)
    at io.micronaut.context.DefaultApplicationContext.initializeContext(DefaultApplicationContext.java:201)
    at io.micronaut.context.DefaultBeanContext.readAllBeanDefinitionClasses(DefaultBeanContext.java:2034)
    at io.micronaut.context.DefaultBeanContext.start(DefaultBeanContext.java:156)
    at io.micronaut.context.DefaultApplicationContext.start(DefaultApplicationContext.java:143)
    at io.micronaut.runtime.Micronaut.start(Micronaut.java:67)
    at io.micronaut.runtime.Micronaut.run(Micronaut.java:274)
    at io.micronaut.runtime.Micronaut.run(Micronaut.java:260)
    at webapp.Application.main(Application.groovy:30)
Caused by: io.micronaut.context.exceptions.BeanInstantiationException: Error instantiating bean of type [org.grails.orm.hibernate.HibernateDatastore]: Could not resolve placeholder ${DBURL} in value: ${DBURL}
    at io.micronaut.context.DefaultBeanContext.doCreateBean(DefaultBeanContext.java:1335)
    at io.micronaut.context.DefaultBeanContext.createAndRegisterSingleton(DefaultBeanContext.java:1902)
    at io.micronaut.context.DefaultBeanContext.loadContextScopeBean(DefaultBeanContext.java:1543)
    at io.micronaut.context.DefaultBeanContext.initializeContext(DefaultBeanContext.java:1038)
    ... 8 common frames omitted
Caused by: io.micronaut.context.exceptions.ConfigurationException: Could not resolve placeholder ${DBURL} in value: ${DBURL}

Answer 1

您混淆了环境变量和系统属性

run {
    systemProperty('micronaut.environments','dev')
    systemProperty('micronaut.config.files', 'C:\shared\application.dev.properties')  
}

编辑：以上将导致文件成为应用程序中的属性源，但它不会提供像 DBURL 这样的环境变量。尝试使用配置文件来提供这些值没有意义。

直接为这些值提供环境变量，或者从配置中删除这些值并允许导入的配置文件提供它们。

例如，从application.yml中删除dataSource.url，然后在C:\shared\application.dev.properties

中设置dataSource.url=someurl

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