springboot Jpa多數(shù)據(jù)源(不同庫(kù))配置過(guò)程
一、前言
springboot版本不同對(duì)多數(shù)據(jù)源配置代碼有一定影響,部分方法和配置略有不同。
本文采用的springboot版本為2.3.12,數(shù)據(jù)源為mysql和postgresql
二、配置實(shí)戰(zhàn)
2.1 基礎(chǔ)pom
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.21</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>${mysql.version}</version>
</dependency>
</dependencies>
2.2 配置文件
spring.datasource.mysql.jdbc-url=jdbc:mysql://localhost:3306/heilongjiang?characterEncoding=UTF-8&useSSL=false&useTimezone=true&serverTimezone=GMT%2B8 spring.datasource.mysql.driver-class-name=com.mysql.jdbc.Driver spring.datasource.mysql.username=root spring.datasource.mysql.password=123456 spring.datasource.pg.jdbc-url=jdbc:postgresql://localhost:5432/hljsyjt?useUnicode=true&characterEncoding=utf8¤tSchema=emergencydev,expert,public spring.datasource.pg.driver-class-name=org.postgresql.Driver spring.datasource.pg.username=postgres spring.datasource.pg.password=postgres spring.jpa.properties.hibernate.mysql-dialect=org.hibernate.dialect.MySQLDialect spring.jpa.properties.hibernate.pg-dialect=org.hibernate.dialect.PostgreSQLDialect spring.jpa.properties.hibernate.temp.use_jdbc_metadata_defaults=false
2.3 數(shù)據(jù)源配置類
package com.gsafety.bg.industrial.config;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.jdbc.DataSourceBuilder;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import javax.sql.DataSource;
/**
* @author Mr.wanter
* @time 2021-8-11 0011
* @description
*/
@Configuration
public class DataSourceConfig {
@Bean("dataSourceMysql")
@Primary
@ConfigurationProperties(prefix = "spring.datasource.mysql")
public DataSource dataSourceMysql() {
return DataSourceBuilder.create().build();
}
@Bean("dataSourcePg")
@ConfigurationProperties(prefix = "spring.datasource.pg")
public DataSource dataSourcePg() {
return DataSourceBuilder.create().build();
}
}
2.4 數(shù)據(jù)源指定配置類
mysql指定數(shù)據(jù)源:
package com.gsafety.bg.industrial.config;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.autoconfigure.orm.jpa.HibernateProperties;
import org.springframework.boot.autoconfigure.orm.jpa.HibernateSettings;
import org.springframework.boot.autoconfigure.orm.jpa.JpaProperties;
import org.springframework.boot.orm.jpa.EntityManagerFactoryBuilder;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Primary;
import org.springframework.data.jpa.repository.config.EnableJpaRepositories;
import org.springframework.orm.jpa.JpaTransactionManager;
import org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean;
import org.springframework.transaction.PlatformTransactionManager;
import org.springframework.transaction.annotation.EnableTransactionManagement;
import javax.sql.DataSource;
import java.util.HashMap;
import java.util.Map;
/**
* @author Mr.wanter
* @time 2021-8-11 0011
* @description
*/
@Configuration
@EnableTransactionManagement
@EnableJpaRepositories(
entityManagerFactoryRef = "entityManagerFactoryMysql",//配置連接工廠 entityManagerFactory
transactionManagerRef = "transactionManagerMysql", //配置 事物管理器 transactionManager
basePackages = {"com.gsafety.bg.industrial.dao"}//設(shè)置持久層所在位置
)
public class MysqlDataSourceConfig {
@Autowired
private JpaProperties jpaProperties;
@Autowired
private HibernateProperties hibernateProperties;
// 自動(dòng)注入配置好的數(shù)據(jù)源
@Autowired
@Qualifier("dataSourceMysql")
private DataSource mysqlDataSource;
// 獲取對(duì)應(yīng)的數(shù)據(jù)庫(kù)方言
@Value("${spring.jpa.properties.hibernate.mysql-dialect}")
private String mysqlDialect;
/**
* @param builder
* @return
*/
@Bean(name = "entityManagerFactoryMysql")
@Primary
public LocalContainerEntityManagerFactoryBean entityManagerFactoryMysql(EntityManagerFactoryBuilder builder) {
Map<String, String> map = new HashMap<>();
// 設(shè)置對(duì)應(yīng)的數(shù)據(jù)庫(kù)方言
map.put("hibernate.dialect", mysqlDialect);
jpaProperties.setProperties(map);
Map<String, Object> properties = hibernateProperties.determineHibernateProperties(
jpaProperties.getProperties(), new HibernateSettings());
return builder
//設(shè)置數(shù)據(jù)源
.dataSource(mysqlDataSource)
//設(shè)置數(shù)據(jù)源屬性
.properties(properties)
//設(shè)置實(shí)體類所在位置.掃描所有帶有 @Entity 注解的類
.packages("com.gsafety.bg.industrial.dao.po")
// Spring會(huì)將EntityManagerFactory注入到Repository之中.有了 EntityManagerFactory之后,
// Repository就能用它來(lái)創(chuàng)建 EntityManager 了,然后 EntityManager 就可以針對(duì)數(shù)據(jù)庫(kù)執(zhí)行操作
.persistenceUnit("mysqlPersistenceUnit")
.build();
}
/**
* 配置事物管理器
*
* @param builder
* @return
*/
@Bean(name = "transactionManagerMysql")
@Primary
PlatformTransactionManager transactionManagerMysql(EntityManagerFactoryBuilder builder) {
return new JpaTransactionManager(entityManagerFactoryMysql(builder).getObject());
}
}
pg指定數(shù)據(jù)源:
package com.gsafety.bg.industrial.config;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.autoconfigure.orm.jpa.HibernateProperties;
import org.springframework.boot.autoconfigure.orm.jpa.HibernateSettings;
import org.springframework.boot.autoconfigure.orm.jpa.JpaProperties;
import org.springframework.boot.orm.jpa.EntityManagerFactoryBuilder;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.data.jpa.repository.config.EnableJpaRepositories;
import org.springframework.orm.jpa.JpaTransactionManager;
import org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean;
import org.springframework.transaction.PlatformTransactionManager;
import org.springframework.transaction.annotation.EnableTransactionManagement;
import javax.sql.DataSource;
import java.util.HashMap;
import java.util.Map;
/**
* @author Mr.wanter
* @time 2021-8-11 0011
* @description
*/
@Configuration
@EnableTransactionManagement
@EnableJpaRepositories(
entityManagerFactoryRef = "entityManagerFactoryPg",//配置連接工廠 entityManagerFactory
transactionManagerRef = "transactionManagerPg", //配置 事物管理器 transactionManager
basePackages = {"com.gsafety.bg.data.dao"}//設(shè)置持久層所在位置
)
public class PgDataSourceConfig {
@Autowired
private JpaProperties jpaProperties;
@Autowired
private HibernateProperties hibernateProperties;
//自動(dòng)注入配置好的數(shù)據(jù)源
@Autowired
@Qualifier("dataSourcePg")
private DataSource PgDataSource;
// 獲取對(duì)應(yīng)的數(shù)據(jù)庫(kù)方言
@Value("${spring.jpa.properties.hibernate.pg-dialect}")
private String pgDialect;
/**
* @param builder
* @return
*/
@Bean(name = "entityManagerFactoryPg")
public LocalContainerEntityManagerFactoryBean entityManagerFactoryPg(EntityManagerFactoryBuilder builder) {
Map<String, String> map = new HashMap<>();
// 設(shè)置對(duì)應(yīng)的數(shù)據(jù)庫(kù)方言
map.put("hibernate.dialect", pgDialect);
jpaProperties.setProperties(map);
Map<String, Object> properties = hibernateProperties.determineHibernateProperties(
jpaProperties.getProperties(), new HibernateSettings());
return builder
//設(shè)置數(shù)據(jù)源
.dataSource(PgDataSource)
//設(shè)置數(shù)據(jù)源屬性
.properties(properties)
//設(shè)置實(shí)體類所在位置.掃描所有帶有 @Entity 注解的類
.packages("com.gsafety.bg.data.dao.po")
// Spring會(huì)將EntityManagerFactory注入到Repository之中.有了 EntityManagerFactory之后,
// Repository就能用它來(lái)創(chuàng)建 EntityManager 了,然后 EntityManager 就可以針對(duì)數(shù)據(jù)庫(kù)執(zhí)行操作
.persistenceUnit("pgPersistenceUnit")
.build();
}
/**
* 配置事物管理器
*
* @param builder
* @return
*/
@Bean(name = "transactionManagerPg")
PlatformTransactionManager transactionManagerPg(EntityManagerFactoryBuilder builder) {
return new JpaTransactionManager(entityManagerFactoryPg(builder).getObject());
}
}
2.5 如何應(yīng)用
數(shù)據(jù)源配置類中指定了掃描po和dao包的路徑
例如entityManagerFactoryPg中的com.gsafety.bg.data.dao.po和com.gsafety.bg.data.dao
那么我們只需要在指定的包下創(chuàng)建po和dao即可,service包層次不受影響,自定義即可。
三數(shù)據(jù)源同理即可。
左側(cè)為雙數(shù)據(jù)源(與本篇實(shí)戰(zhàn)內(nèi)容一致),右側(cè)為三數(shù)據(jù)源(三數(shù)據(jù)源目錄結(jié)構(gòu)示例)。

其他編碼常規(guī)開(kāi)發(fā)即可
- po:
@Entity
@Builder
@Data
@AllArgsConstructor
@NoArgsConstructor
@Table(name = "jc_repertory")
public class JcRepertoryPO implements Serializable {
//some fields
}
- dao:
public interface JcRepertoryDao extends JpaRepository<JcRepertoryPO, String>, JpaSpecificationExecutor<JcRepertoryPO> {
}- service:
public interface JcRepertoryService {
List<JcRepertoryPO> list();
}
@Service
public class JcRepertoryServiceImpl implements JcRepertoryService {
@Resource
private JcRepertoryDao jcRepertoryDao;
@Override
public List<JcRepertoryPO> list() {
List<JcRepertoryPO> all = jcRepertoryDao.findAll();
return all;
}
}
- controller 略
啟動(dòng)類添加掃描
@SpringBootApplication_(_scanBasePackages = _{_"com.gsafety.bg.data", "com.gsafety.bg.industrial"_})_三、遇到的問(wèn)題 數(shù)據(jù)庫(kù)連接報(bào)錯(cuò)
1.jdbcUrl is required with driverClassName
- 主要原因是在1.0 配置數(shù)據(jù)源的過(guò)程中主要是寫成:spring.datasource.url 和spring.datasource.driverClassName。
- 而在2.0升級(jí)之后需要變更成:spring.datasource.jdbc-url和spring.datasource.driver-class-name
spring.datasource.pg.jdbc-url=jdbc:postgresql://localhost:5432/hljsyjt?useUnicode=true&characterEncoding=utf8¤tSchema=emergencydev,expert,public spring.datasource.pg.driver-class-name=org.postgresql.Driver
2.Paging query needs to have a Pageable parameter!
- 原系統(tǒng)中對(duì)jap的Repository進(jìn)行了封裝,采用常規(guī)方式調(diào)用即可。
3.more than one ‘primary’ bean found among candidates
- 2.4 數(shù)據(jù)源指定配置類 中只有一個(gè)類中的方法添加 @Primary 另外一個(gè)不要加這個(gè)注解
4.互聯(lián)網(wǎng)查詢的代碼中JpaProperties沒(méi)有g(shù)etHibernateProperties
- 與springboot版本有關(guān),上面代碼已修改。
總結(jié)
以上為個(gè)人經(jīng)驗(yàn),希望能給大家一個(gè)參考,也希望大家多多支持腳本之家。
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