在Springboot2.0項目中使用Druid配置多數據源
阿新 • • 發佈：2018-05-23
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在Springboot出現之前配置數據源以及相關的事物，緩存等內容一直是個繁瑣的工作，但是Springboot出現後這些基本都可以靠默認配置搞定，就變得很輕松了。這就是現在推崇模板>配置的原因，不過話說回來，如果你想配和模板不同，該繁瑣的地方仍然一樣繁瑣，比如今天要講的，在Springboot項目中配多數據源。接下來逐漸講一下。
為項目添加Druid依賴
直接去Maven倉庫搜最新的Druid和log4j，阿裏的Druid強依賴log4j，卻沒加到Maven依賴中，實際上，不裝log4j的話會報運行錯誤。同理Spring-boot-web，不過這個基本所有項目都有不特意強調了。
<!-- https://mvnrepository.com/artifact/com.alibaba/druid --> 生成不同數據源需要的Bean
加入依賴後，我們需要以下幾個步驟：
- 生成對應每個數據源的DruidDataSource Bean(由於對於多個數據庫，同類名Bean有多個，故給每個Bean顯性賦名，顯性註入防錯誤)
- 將不同數據源註入到JPA，需要配置EntityManager,JpaProperties,PlatformTransactionManager
代碼如下,以下代碼省略getter，setter，一些具體問題參看代碼中註釋：
DruidDBConfig.java
@Configuration
@ConfigurationProperties("druid")
public class DruidDBConfig {
//此處替換成你自己的logger方案
private final Logger logger = LogSingleton.getLogSingleton().getLogger();
//這些變量在yml中配置
private String dbUrl1;
private String username1;
private String password1;
private String driverClassName1;
private String validationQuery1;
private String dbUrl2;
private String username2;
private String password2;
private String driverClassName2;
private String validationQuery2;
@Value("5")
private int initialSize;
@Value("5")
private int minIdle;
@Value("30")
private int maxActive;
/**
* 單位是毫秒
*/
@Value("60000")
private int maxWait;
/**
* 配置間隔多久才進行一次檢測，檢測需要關閉的空閑連接，單位是毫秒
*/
@Value("60000")
private int timeBetweenEvictionRunsMillis;
/**
* 配置一個連接在池中最小生存的時間，單位是毫秒
*/
@Value("300000")
private int minEvictableIdleTimeMillis;
@Value("true")
private boolean testWhileIdle;
@Value("true")
private boolean testOnBorrow;
@Value("false")
private boolean testOnReturn;
/**
* 打開PSCache，並且指定每個連接上PSCache的大小
*/
@Value("true")
private boolean poolPreparedStatements;
@Value("50")
private int maxPoolPreparedStatementPerConnectionSize;
/**
* 配置監控統計攔截的filters，去掉後監控界面sql無法統計，‘wall‘用於防火墻
*/
@Value("stat,wall,log4j")
private String filters;
/**
* 通過connectProperties屬性來打開mergeSql功能；慢SQL記錄
*/
@Value("druid.stat.mergeSql=true;druid.stat.slowSqlMillis=500")
private String connectionProperties;
@Bean(name = "primaryDataSource")
@Qualifier("primaryDataSource")
@Primary
public DataSource primaryDataSource() {
return getDruidDataSource(username1, password1, dbUrl1, driverClassName1, validationQuery1);
}
@Bean(name = "secondaryDataSource")
@Qualifier("secondaryDataSource")
public DataSource secondaryDataSource() {
return getDruidDataSource(username2, password2, dbUrl2, driverClassName2, validationQuery2);
}
/*
/根據配置文件生成DruidDataSource
*/
private DruidDataSource getDruidDataSource(String username, String password, String url, String driverClassName, String validationQuery) {
DruidDataSource datasource = new DruidDataSource();
datasource.setUrl(url);
datasource.setUsername(username);
datasource.setPassword(password);
datasource.setDriverClassName(driverClassName);
//configuration
datasource.setInitialSize(initialSize);
datasource.setMinIdle(minIdle);
datasource.setMaxActive(maxActive);
datasource.setMaxWait(maxWait);
datasource.setTimeBetweenEvictionRunsMillis(timeBetweenEvictionRunsMillis);
datasource.setMinEvictableIdleTimeMillis(minEvictableIdleTimeMillis);
datasource.setValidationQuery(validationQuery);
datasource.setTestWhileIdle(testWhileIdle);
datasource.setTestOnBorrow(testOnBorrow);
datasource.setTestOnReturn(testOnReturn);
datasource.setPoolPreparedStatements(poolPreparedStatements);
datasource.setMaxPoolPreparedStatementPerConnectionSize(maxPoolPreparedStatementPerConnectionSize);
try {
datasource.setFilters(filters);
} catch (SQLException e) {
logger.severe("druid configuration initialization filter : " + e);
}
datasource.setConnectionProperties(connectionProperties);
return datasource;
}
}PrimaryConfig.java
@Configuration
@EnableTransactionManagement
@EnableJpaRepositories(
entityManagerFactoryRef = "entityManagerFactoryPrimary",
transactionManagerRef = "transactionManagerPrimary",
basePackages = {"com.XX.XX請替換為你的數據源1Repository目錄"})
public class PrimaryConfig {
@Resource
@Qualifier("primaryDataSource")
private DataSource primaryDataSource;
@Primary
@Bean(name = "entityManagerPrimary")
public EntityManager entityManager(EntityManagerFactoryBuilder builder) {
return entityManagerFactoryPrimary(builder).getObject().createEntityManager();
}
@Resource
private JpaProperties jpaProperties;
private Map<String, Object> getVendorProperties() {
//在yml中配置Hibernate，因此此處僅需一個空的Hibernate設置。
return jpaProperties.getHibernateProperties(new HibernateSettings());
}
/**
* 設置實體類所在位置
*/
@Primary
@Bean(name = "entityManagerFactoryPrimary")
public LocalContainerEntityManagerFactoryBean entityManagerFactoryPrimary(EntityManagerFactoryBuilder builder) {
return builder
.dataSource(primaryDataSource)
.packages("com.XX.XX請替換為你的數據源1Entity目錄")
.persistenceUnit("primaryPersistenceUnit")
.properties(getVendorProperties())
.build();
}
@Primary
@Bean(name = "transactionManagerPrimary")
public PlatformTransactionManager transactionManagerPrimary(EntityManagerFactoryBuilder builder) {
return new JpaTransactionManager(entityManagerFactoryPrimary(builder).getObject());
}
}SecondaryConfig.java
@Configuration
@EnableTransactionManagement
@EnableJpaRepositories(
entityManagerFactoryRef = "entityManagerFactorySecondary",
transactionManagerRef = "transactionManagerSecondary",
basePackages = {"com.XX.XX請替換為你的數據源2Repository目錄"})
public class SecondaryConfig {
@Resource
@Qualifier("secondaryDataSource")
private DataSource secondaryDataSource;
@Bean(name = "entityManagerSecondary")
public EntityManager entityManager(EntityManagerFactoryBuilder builder) {
return entityManagerFactorySecondary(builder).getObject().createEntityManager();
}
@Resource
private JpaProperties jpaProperties;
private Map<String, Object> getVendorProperties() {
//在yml中配置Hibernate，因此此處僅需一個空的Hibernate設置。
return jpaProperties.getHibernateProperties(new HibernateSettings());
}
@Bean(name = "entityManagerFactorySecondary")
public LocalContainerEntityManagerFactoryBean entityManagerFactorySecondary(EntityManagerFactoryBuilder builder) {
return builder
.dataSource(secondaryDataSource)
.packages("com.XX.XX請替換為你的數據源2Entity目錄")
.persistenceUnit("secondaryPersistenceUnit")
.properties(getVendorProperties())
.build();
}
@Bean(name = "transactionManagerSecondary")
PlatformTransactionManager transactionManagerSecondary(EntityManagerFactoryBuilder builder) {
return new JpaTransactionManager(entityManagerFactorySecondary(builder).getObject());
}
}之後配置yml，註入在DruidDBConfig中未設置的值：
druid:
# 第一個數據源的配置
driverClassName1: com.microsoft.sqlserver.jdbc.SQLServerDriver
dbUrl1: jdbc:sqlserver://XXX;databaseName=XXX
username1: sa
password1: 123456
# 測試連通，必須是單條的可順利執行的SQL語句。
validationQuery1: select 1
# 第二個數據源的配置
driverClassName2: com.microsoft.sqlserver.jdbc.SQLServerDriver
dbUrl2: jdbc:sqlserver://YYY;databaseName=YYY
username2: sa
password2: 123456
# 測試連通，必須是單條的可順利執行的SQL語句。
validationQuery2: select 1
spring:
# hibernate配置
jpa:
database: sql_server
generate-ddl: true
show-sql: true
hibernate:
ddl-auto: update
naming:
physical-strategy: org.springframework.boot.orm.jpa.hibernate.SpringPhysicalNamingStrategy一些坑
一定要加log4j依賴
Entity的主鍵自增策略要從@GeneratedValue改為@GeneratedValue(strategy=GeneratedType.IDENTITY)，因為默認方法在Druid下無法工作。
在Springboot2.0項目中使用Druid配置多數據源