我目前hibernate.cfg.xml在 Spring Web 應用程式類路徑中有我的 Hibernate 組態檔，并使用 Maven 資源插件為我的開發和生產資料庫設定不同的值，如下所示：
資源/hibernate.cfg.xml：
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD//EN"
"../hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<property name="hibernate.connection.driver_class">@hibernate.connection.driver_class@</property>
<property name="hibernate.connection.url">@hibernate.connection.url@</property>
<property name="hibernate.dialect">@hibernate.dialect@</property>
<property name="hibernate.default_schema">@hibernate.default_schema@</property>
<property name="hibernate.connection.username">@hibernate.connection.username@</property>
<property name="hibernate.connection.password">@hibernate.connection.password@</property>
<property name="hibernate.connection.requireSSL">false</property>
<property name="hibernate.connection.autoReconnect">true</property>
<property name="hibernate.enable_lazy_load_no_trans">true</property>
<!--<property name="hbm2ddl.auto">update</property>-->
<property name="hibernate.show_sql">false</property>
<property name="hibernate.format_sql">false</property>
<property name="hibernate.connection.CharSet">utf8</property>
<property name="hibernate.connection.characterEncoding">utf8</property>
<property name="hibernate.connection.useUnicode">true</property>
<property name="hibernate.connection.provider_class">org.hibernate.c3p0.internal.C3P0ConnectionProvider</property>
<property name="hibernate.c3p0.min_size">1</property>
<property name="hibernate.c3p0.max_size">50</property>
<property name="hibernate.c3p0.timeout">120</property>
<property name="hibernate.c3p0.max_statements">50</property>
</session-factory>
</hibernate-configuration>
pom.xml（示例）：
<profiles>
<profile>
<id>dev</id>
<activation>
<activeByDefault>true</activeByDefault>
</activation>
<properties>
<hibernate.connection.driver_class>com.mysql.cj.jdbc.Driver</hibernate.connection.driver_class>
<hibernate.connection.url>jdbc:mysql://localhost:3306/dev_db</hibernate.connection.url>
<hibernate.dialect>org.hibernate.dialect.MySQL5Dialect</hibernate.dialect>
<hibernate.default_schema></hibernate.default_schema>
<hibernate.connection.username>dev_username</hibernate.connection.username>
<hibernate.connection.password>dev_password</hibernate.connection.password>
</properties>
</profile>
<profile>
<id>deploy</id>
<properties>
<hibernate.connection.driver_class>com.mysql.cj.jdbc.Driver</hibernate.connection.driver_class>
<hibernate.connection.url>jdbc:mysql://localhost:3306/deploy_db</hibernate.connection.url>
<hibernate.dialect>org.hibernate.dialect.MySQL5Dialect</hibernate.dialect>
<hibernate.default_schema></hibernate.default_schema>
<hibernate.connection.username>deploy_username</hibernate.connection.username>
<hibernate.connection.password>deploy_password</hibernate.connection.password>
</properties>
</profile>
</profiles>
這些設定由LocalSessionFactoryBean這樣的加載：
@Bean( name = "sessionFactory" )
public LocalSessionFactoryBean sessionFactory() {
LocalSessionFactoryBean localSessionFactoryBean = new LocalSessionFactoryBean();
localSessionFactoryBean.setDataSource( dataSource() );
localSessionFactoryBean.setConfigLocation( new ClassPathResource( "hibernate.cfg.xml" ) );
localSessionFactoryBean.setPackagesToScan( "org.example" );
return localSessionFactoryBean;
}
但是現在我需要將軟體發送給一個顯然不希望我知道他們的資料庫連接屬性的客戶，所以我想將這些屬性從我的專案中移到某個本地資源（如C:\MyEpicProgram\db.properties），這些資源將在每個環境中單獨設定（我的本地、客戶端的測驗服務器、客戶端的部署服務器等）并通過 JVM 引數鏈接到我的應用程式（如-DdbConfigPath=C:\MyEpicProgram\db.properties）
所以我得到類似的東西： db.properties：
hibernate.connection.driver_class com.mysql.cj.jdbc.Driver
hibernate.connection.url jdbc:mysql://localhost:3306/client_db
hibernate.dialect org.hibernate.dialect.MySQL5Dialect
hibernate.default_schema
hibernate.connection.username client_username
hibernate.connection.password client_password
這些將在該環境中的專案啟動時自動使用。我怎樣才能做到這一點？我一直在嘗試修改我的會話工廠 bean 以手動設定每個引數，但截至目前未能正確執行此操作。
uj5u.com熱心網友回復：
你可以嘗試這樣做。但是，并不真正建議這樣做，因為您正在將該檔案耦合到您的應用程式。
@Configuration
public class Configuration {
@Autowired
private Environment environment;
@Bean
public LocalSessionFactoryBean localSessionFactoryBean() {
LocalSessionFactoryBean localSessionFactoryBean = new LocalSessionFactoryBean();
localSessionFactoryBean.setDataSource( dataSource() );
localSessionFactoryBean.setConfigLocation( new ClassPathResource( "hibernate.cfg.xml" ) );
localSessionFactoryBean.setPackagesToScan( "org.example" );
Properties properties = new Properties();
properties.load(new FileInputStream(environment.getProperty("dbConfigPath")));
localSessionFactoryBean.setHibernateProperties(properties);
return localSessionFactoryBean;
}
}
您可以做的是使用環境變數來定義此處描述的 Hibernate 屬性。
uj5u.com熱心網友回復：
所以，我從 Flavalacious 的建議中汲取了靈感，就這樣解決了我的問題：
@Configuration
public class DBConfig {
private final Logger logger = Logger.getLogger( this.getClass() );
private String dataSourceDriverClass;
private String dataSourceDialect;
private String dataSourceUrl;
private String dataSourceUsername;
private String dataSourcePassword;
public DBConfig() {
Properties jdbcProperties = new Properties();
if ( System.getProperty( "dbConfigPath" ) == null )
throw new IllegalStateException( "Property -DdbConfigPath must be provided in VM options." );
try ( InputStream fileStream = new FileInputStream( filePath ) ) {
// load properties from file
jdbcProperties.load( fileStream );
// setting properties from file to local variables for usage in various beans
dataSourceUrl = jdbcProperties.getProperty( "url" );
dataSourceUsername = jdbcProperties.getProperty( "username" );
dataSourcePassword = jdbcProperties.getProperty( "password" );
dataSourceDriverClass = jdbcProperties.getProperty( "driverClass" );
dataSourceDialect = jdbcProperties.getProperty( "dialect" );
} catch ( IOException e ) {
logger.error( "Couldn't load JDBC properties." );
}
}
@Bean(name = "dataSource")
public DriverManagerDataSource dataSource() {
DriverManagerDataSource driverManagerDataSource = new DriverManagerDataSource();
// use loaded parameters to configure datasource
driverManagerDataSource.setDriverClass( dataSourceDriverClass );
driverManagerDataSource.setJdbcUrl( dataSourceUrl );
driverManagerDataSource.setUser( dataSourceUsername );
driverManagerDataSource.setPassword( dataSourcePassword );
return driverManagerDataSource;
}
@Bean( name = "sessionFactory" )
public LocalSessionFactoryBean sessionFactory() {
LocalSessionFactoryBean localSessionFactoryBean = new LocalSessionFactoryBean();
localSessionFactoryBean.setDataSource( dataSource() );
localSessionFactoryBean.setConfigLocation( new ClassPathResource( "hibernate.cfg.xml" ) ); // the following properties are not present in this XML
localSessionFactoryBean.setPackagesToScan( "org.example" );
// set our properties to be discoverable by SessionFactory
localSessionFactoryBean.getHibernateProperties().setProperty( "hibernate.connection.driver_class", dataSourceDriverClass );
localSessionFactoryBean.getHibernateProperties().setProperty( "hibernate.connection.url", dataSourceUrl );
localSessionFactoryBean.getHibernateProperties().setProperty( "hibernate.connection.username", dataSourceUsername );
localSessionFactoryBean.getHibernateProperties().setProperty( "hibernate.connection.password", dataSourcePassword );
localSessionFactoryBean.getHibernateProperties().setProperty( "hibernate.dialect", dataSourceDialect );
if ( dataSourceDefaultSchema != null )
localSessionFactoryBean.getHibernateProperties().setProperty( "hibernate.default_schema", dataSourceDefaultSchema );
return localSessionFactoryBean;
}
}
db.properties必須在 VM 選項中提供檔案路徑，如下所示：-DdbConfigPath=C:\path\to\db.properties
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