目录
- 1. Maven
- 2. 基本配置
- DataSource
- 3. 多数据源配置
- 3.1 JpaConfigOracle
- 3.2 JpaConfigMysql
- 4. Dao层接口
1. Maven
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<!-- 数据库连接池 -->
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid-spring-boot-starter</artifactId>
<version>.2.9</version>
</dependency>
<dependency>
<groupId>com.oracle.database.jdbc</groupId>
<artifactId>ojdbc</artifactId>
<scope>runtime</scope>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>.0.16</version>
</dependency>
2. 基本配置
DataSource
在基本配置中,我们首先来配置多数据源基本信息以及DataSource,首先在application.yml中添加如下配置信息:
spring:
datasource:
# oracle数据库配置
oracle:
driver-class-name: oracle.jdbc.driver.OracleDriver
url: jdbc:oracle:thin:@10.0.66.72:1521:orcl
username: test
password: test
# mysql数据库配置
mysql:
driver-class-name: com.mysql.cj.jdbc.Driver
url: jdbc:mysql://10.0.66.60:3306/swap_business_db?useUnicode=true&characterEncoding=UTF-8&useJDBCCompliantTimezoneShift=true&useLegacyDatetimeCode=false&serverTimezone=Asia/Shanghai
username: root
password: root
type: com.alibaba.druid.pool.DruidDataSource
# druid数据库连接池
druid:
filters: stat
initialSize: 5
maxActive: 20
maxPoolPreparedStatementPerConnectionSize: 20
maxWait: 60000
minEvictableIdleTimeMillis: 30000
minIdle: 5
poolPreparedStatements: false
testOnBorrow: false
testOnReturn: false
testWhileIdle: true
timeBetweenEvictionRunsMillis: 60000
#Oracle模式
validation-query: SELECT 1 FROM DUAL #用来检测连接是否有效的sql
#MySQL模式
validation-queryM: SELECT 1 #用来检测连接是否有效的sql
jpa:
hibernate:
ddl-auto: none
oracle-dialect: org.hibernate.dialect.Oracle10gDialect
mysql-dialect: org.hibernate.dialect.MySQL8Dialect
show-sql: false
接下来配置两个DataSource,如下:
@Configuration
public class DataSourceConfig {
@Bean
@ConfigurationProperties(prefix = "spring.datasource.oracle")
@Primary
DataSource dsOracle() {
return DruidDataSourceBuilder.create().build();
}
@Bean
@ConfigurationProperties(prefix = "spring.datasource.mysql")
DataSource dsMysql() {
return DruidDataSourceBuilder.create().build();
}
}
注意:@Primary,这个注解一定不能少,否则在项目启动时会出错,@Primary表示当某一个类存在多个实例时,优先使用哪个实例。
3. 多数据源配置
接下来配置Jpa的基本信息,这里两个数据源,分别在两个类中来配置,oracle和mysql配置如下:
3.1 JpaConfigOracle
@Configuration
@EnableJpaRepositories(basePackages = "cn.piesat.dao.oracle",
entityManagerFactoryRef = "localContainerEntityManagerFactoryBeanOracle",
transactionManagerRef = "platformTransactionManagerOracle")
public class JpaConfigOracle {
@Autowired
@Qualifier(value = "dsOracle")
DataSource dsOracle;
@Autowired
JpaProperties jpaProperties;
@Autowired
private HibernateProperties hibernateProperties;
@Value("${spring.jpa.hibernate.oracle-dialect}")
private String oracleDialect;
@Value("${spring.jpa.show-sql}")
private String showSql;
@Bean
@Primary
LocalContainerEntityManagerFactoryBean localContainerEntityManagerFactoryBeanOracle(EntityManagerFactoryBuilder builder) {
return builder.dataSource(dsOracle)
.packages("cn.piesat.model")
.properties(getVendorProperties())
.persistenceUnit("pu")
.build();
}
/**
* 设置数据源属性
*
* @return
*/
private Map<String, Object> getVendorProperties() {
Map<String, String> map = new HashMap<>();
// 设置oracle数据库方言
map.put("hibernate.dialect", oracleDialect);
map.put("show-sql", showSql);
jpaProperties.setProperties(map);
return hibernateProperties.determineHibernateProperties(
jpaProperties.getProperties(), new HibernateSettings());
}
/**
* 配置事务管理器
*
* @param builder
* @return
*/
@Bean
PlatformTransactionManager platformTransactionManagerOracle(EntityManagerFactoryBuilder builder) {
LocalContainerEntityManagerFactoryBean factoryBeanOracle = localContainerEntityManagerFactoryBeanOracle(builder);
return new JpaTransactionManager(factoryBeanOracle.getObject());
}
}
配置说明:JpaProperties是系统提供的一个实例,里边的数据就是我们在application.yml中配置的jpa相关的配置。HibernateProperties用来手动设置数据源属性,例如定义不同的数据库方言。然后我们提供两个Bean,分别是LocalContainerEntityManagerFactoryBean和PlatformTransactionManager事务管理器,不同于MyBatis和JdbcTemplate,在Jpa中,事务一定要配置。在提供LocalContainerEntityManagerFactoryBean的时候,需要指定packages,这里的packages指定的包就是这个数据源对应的实体类所在的位置,另外在这里配置类上通过@EnableJpaRepositories注解指定dao所在的位置,以及LocalContainerEntityManagerFactoryBean和PlatformTransactionManager分别对应的引用的名字。
这样第一个就配置好了,第二个基本和这个类似,主要有几个不同点:
- dao的位置不同
- persistenceUnit不同
- 相关bean的名称不同
3.2 JpaConfigMysql
@Configuration
@EnableJpaRepositories(basePackages = "cn.piesat.dao.mysql",
entityManagerFactoryRef = "localContainerEntityManagerFactoryBeanMysql",
transactionManagerRef = "platformTransactionManagerMysql")
public class JpaConfigMysql {
@Autowired
@Qualifier(value = "dsMysql")
DataSource dsMysql;
@Autowired
JpaProperties jpaProperties;
@Autowired
private HibernateProperties hibernateProperties;
@Value("${spring.jpa.hibernate.mysql-dialect}")
private String mysqlDialect;
@Value("${spring.jpa.show-sql}")
private String showSql;
@Bean
LocalContainerEntityManagerFactoryBean localContainerEntityManagerFactoryBeanMysql(EntityManagerFactoryBuilder builder) {
return builder.dataSource(dsMysql)
.packages("cn.piesat.model")
.properties(getVendorProperties())
.persistenceUnit("pu")
.build();
}
/**
* 设置数据源属性
*
* @return
*/
private Map<String, Object> getVendorProperties() {
Map<String, String> map = new HashMap<>();
// 设置mysql数据库方言
map.put("hibernate.dialect", mysqlDialect);
map.put("show-sql", showSql);
jpaProperties.setProperties(map);
return hibernateProperties.determineHibernateProperties(
jpaProperties.getProperties(), new HibernateSettings());
}
/**
* 配置事务管理器
*
* @param builder
* @return
*/
@Bean
PlatformTransactionManager platformTransactionManagerMysql(EntityManagerFactoryBuilder builder) {
LocalContainerEntityManagerFactoryBean factoryBeanMysql = localContainerEntityManagerFactoryBeanMysql(builder);
return new JpaTransactionManager(factoryBeanMysql.getObject());
}
}
4. Dao层接口
接下来,在对应位置分别提供相关的实体类和dao即可,注意:实体类可以共用,dao的位置不同
oracle接口:
package cn.piesat.dao.oracle;
public interface TMasOrbitInfoDao extends JpaRepository<TMasOrbitInfo, String> {
List<TMasOrbitInfo> findBySatelliteAndObservationDateBetween(String satellite, String start, String end);
}
mysql接口:
package cn.piesat.dao.mysql;
public interface SwapBusinessEfficiencyMainDao extends JpaRepository<SwapBusinessEfficiencyMain, String> {
List<SwapBusinessEfficiencyMain> findByDataIdentifyAndDataTimeBetween(String identify, String start, String end);
}
到此,所有的配置就算完成了,接下来就可以在Service中注入不同的Dao,不同的Dao操作不同的数据源。