Question

当我们使用像cassandra / mongo这样的任何数据库时，Spring引导应用程序属性需要遵循https://docs.spring.io/spring-boot/docs/current/reference/html/common-application-properties.html的约定。如果我们想要为数据库设置而不是spring-boot约定声明我们自己的属性，那么设置数据库需要做的所有步骤是什么？

Answer 1

您可以执行此操作：Spring boot - custom variables in Application.properties

或者您可以在application.properties文件中创建自己的属性，如：

my.property.someDb.hostname=http://wherever.com然后在您的代码中引用它，如：

@Value("${my.property.someDb.hostname}")
private String someDbHostname;

更新1：

如果要使用自己的属性创建MongoDb，则必须在@Configuration文件中定义正确的Java Bean。对于MongoDB，它可能如下所示：

@Configuration
public class MyMongoConfig extends AbstractMongoConfiguration{ 

  @Value("${my.property.someDb.hostname}")
  private String someDbHostname;

  @Value("${my.property.someDb.myOwnPortDefinition}")
  private int myOwnPortDefinition;

  @Value("${my.property.someDb.myDatabasename}")
  private String myDatabasename;

  @Override
  protected String getDatabaseName() {
    return myDatabasename;
  }

  @Override
  @Bean
  public Mongo mongo() throws Exception{
    return new MongoClient(someDbHostname, myOwnPortDefinition );
  }

  @Bean
  public MongoTemplate mongoTemplate() throws Exception{
    return new MongoTemplate(mongo(), getDatabaseName());
  }    
}

Answer 2

这些是获取Jdbc数据源所需的必要步骤，mongodb在Spring Boot中设置

需要启用了事务管理的@Configuration类在它上面
读取数据源的环境属性，即dataSource 网址，用户名，密码等。
为数据源，会话工厂，事务管理器创建bean 等
完成上述所有设置后，请在您的@Configuration中使用此@Configuration @EnableTransactionManagement @ComponentScan(basePackages = {"com.example.xyz"}) public class DatabaseEntityConfiguration { public static final String DATABASE_ENTITY_DATA_SOURCE = "databaseDataSource"; public static final String DATABASE_HIBERNATE_PROPERTIES = "databaseHibernateProperties"; public static final String DATABASE_ENTITY_SESSION_FACTORY = "databaseSessionFactory"; public static final String DATABASE_ENTITY_TRANSACTION_MANAGER = "databaseTransactionManager"; public static final String DATABASE_ENTITY_DB_CONFIG_DAO = "dmdatabaseDbConfigDao"; public static final String DATABASE_ENTITY_DB_CONFIG_SERVICE = "dmdatabaseDbConfigService"; private static final String ENTITY_PACKAGE = "com.example.xyz.database.entity"; @Autowired private org.springframework.core.env.Environment environment; @Bean(name = DATABASE_ENTITY_DATA_SOURCE) public DataSource databaseEntitydataSource() throws PropertyVetoException { // mongodb properties String driverClass = environment.getProperty("databaseEntity.mongodb.driverClassName"); String mongodbUrl = environment.getProperty("databaseEntity.mongodb.dmdatabaseDataSource.url"); String user = environment.getProperty("databaseEntity.mongodb.dmdatabaseDataSource.username"); String password = environment.getProperty("databaseEntity.mongodb.dmdatabaseDataSource.password"); Preconditions.checkArgument(StringUtils.isNotBlank(driverClass), "The property mongodb driverClass must not be null or blank"); Preconditions.checkArgument(StringUtils.isNotBlank(mongodbUrl), "The property mongodb mongodbUrl must not be null or blank"); Preconditions.checkArgument(StringUtils.isNotBlank(user), "The property mongodb user must not be null or blank"); Preconditions.checkArgument(StringUtils.isNotBlank(password), "The property mongodb password must not be null or blank"); dataSource.setDriverClass(driverClass); dataSource.setmongodbUrl(mongodbUrl); dataSource.setUser(user); dataSource.setPassword(password); return dataSource; } @Bean(name = DATABASE_ENTITY_SESSION_FACTORY) public AnnotationSessionFactoryBean databaseEntitySessionFactory() throws PropertyVetoException { AnnotationSessionFactoryBean annotationSessionFactoryBean = new AnnotationSessionFactoryBean(); annotationSessionFactoryBean.setDataSource(databaseEntitydataSource()); annotationSessionFactoryBean.setPackagesToScan(ENTITY_PACKAGE); annotationSessionFactoryBean.setAnnotatedClasses(DBConfig.class); annotationSessionFactoryBean.setHibernateProperties(databaseEntityHibernateProperties()); return annotationSessionFactoryBean; } @Bean(name = DATABASE_ENTITY_TRANSACTION_MANAGER) public HibernateTransactionManager databaseEntityTransactionManager() throws PropertyVetoException { HibernateTransactionManager transactionManager = new HibernateTransactionManager(); transactionManager.setSessionFactory(databaseEntitySessionFactory().getObject()); return transactionManager; } } 使用者初始化spring应用程序上下文

以下是春季启动中mongodb数据源布线的一些片段

<强> DataSourceConfiguration.java

UIObject

Spring引导常用应用程序属性

2 个答案: